期号 
Int. J. Simul. Multidisci. Des. Optim.
卷号 12, 2021
Advances in Modeling and Optimization of Manufacturing Processes



文献编号  26  
页数  10  
DOI  https://doi.org/10.1051/smdo/2021027  
网上发表时间  2021年10月29日 
Research Article
Modelling and analysis of cutting forces while micro end milling of Tialloy using finite element method
^{1}
Department of Production Engineering, VJTI, Mumbai, India
^{2}
Department of Mechanical Engineering, VJTI, Mumbai, India
^{3}
Department of Mechanical Engineering, NTC, Pune, India
^{*} email: samastud@me.vjti.ac.in
Received:
22
August
2021
Accepted:
10
October
2021
Micromilling is one of the preferable micromanufacturing process, as it exhibits the flexibility to produce complex 3D microparts. The cutting forces generated in micro end milling can be attributed for tool vibration and process instability. If cutting forces are not controlled below critical limits, it may lead to catastrophic failure of tool. Cutting force has a significant role to decide the surface roughness. Therefore accurate prediction of cutting forces and selection of suitable cutting parameters mainly feed, is important while micro end milling. In present study, finite element method (FEM) based model has been developed by using ABAQUAS/Explicit 6.12 software. VonMisses stresses and cutting forces are predicted while micro end milling of Ti6Al4V. Further, cutting forces were measured during experimentation using dynamometer mounted on micromilling test bed. Cutting forces predicted by FEM model are in good agreement with the experimental force values. Obtained FEM results have been used to study the size effect in micro end milling process. Moreover, the effect of uncut chip thickness to cutting edge radius ratio (h/rc) on surface roughness (Ra) has been studied. It is found the feed 2.5 µm/tooth is suitable value to produce optimum surface roughness and cutting forces.
Key words: Cutting force / finite element method / microend milling / tungsten carbide / VonMisses stress / surface roughness / Ti6Al4V
© N. Bhople et al., Published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
1 Introduction
Micromilling process is more versatile than competing micromachining processes such as micro EDM. Micromilling can produce 3D shapes on metallic alloys, ceramics and polymers [1]. It is extensively used in micro manufacturing of components required in electronics, defence, telecommunications, mechatronics and biomedical sectors [2]. This process is faster as well cost effective compared to other micro manufacturing process [3,4]. Micromilling provides higher material removal rates as well as machining of high aspect ratio parts can be realized via this process [5]. Size effect, minimum chip thickness and material inhomogeneity are some of the issues in micromilling. The assumption made in conventional Merchant's theory (cutting edge is sharp and there is no workpiecetool contact along clearance face) are invalid in the micro milling process. Identification of minimum chip thickness values for different work material is additional challenge in micromilling. Lower undeformed chip thickness may increase cutting forces by ploughing mechanism while higher undeformed chip thickness increases cutting forces by increasing chip load.
Performance of micro end milling is significantly affected by the cutting forces; high cutting forces are attributed to the tool deflection and process instability (tool run out, chatter). High cutting forces are very prevalent while machining harder materials like titanium alloys and hardened steel. Catastrophic failure of tool may also occur if cutting forces are not optimized, as micro tools has low stiffness. Large negative rake angle due to tool wear and elastoplastic deformation of wokpiece contributes to higher cutting forces [5–8]. Prediction of cutting forces is essential in micro end milling to improve product quality and to reduce machining cost. The h/rc ratio is crucial parameter in micromilling. This factor is characteristics of a given material at specified cutting conditions. Balazs et al. [8] presented the valuable findings of micromilling in their latest review article. In micro milling, the value of undeformed chip thickness is equivalent to the cutting edge radius of tool and the grain size of workpiece. Therefore, the lower uncut chip thickness affects the surface quality by accelerating the ploughing mechanism. It is also suggested that increased feed per tooth has positive effect on tool condition.
Industries are using predictive modelling of machining process. These modelling techniques are classified as numerical, analytical, experimental, hybrid and artificial intelligent based models. Fundamental machining processes parameters like stress distribution, cutting forces, strain and temperature can be predicted by using these modelling techniques. Mechanistic modelling can also be used to predict the cutting forces in micro end milling with due consideration of tool geometry and material removal mechanism. 2D Finite element method based modelling techniques are widely accepted in mechanical microcutting due to their good computational speed [9–11]. FEM can model a micro cutting operation to predict how all process variables influence the desired responses. It has been extensively used to predict the cutting forces, chip formation and tool wear.
Thepsonthi and Ozel [12] used 3 D FE process to simulate chip flow and tool wear while machining Ti6Al4V for different cutting edge redii. The effect of tool edge radius wear on the performance of microend milling process has been studied by fullimmersion, half immersion, up and down milling approaches. To study the temperature dependent softening effects the modified JohnsonCook (JC) material model was used to model the Ti6Al4V workpiece. Further they compared the results obtained in 3D FEM and 2D FEM process by using five degree polynomial equation with curve fitting. The increased cutting edge radius (3 µm to 6 µm to 12 µm) significantly affected the milling process, in terms of increased tool wear, higher cutting forces and cutting temperature. Higher tool wear in up milling has been observed as the edge radius increases compared to down milling, in down milling tool enters in the workpiece at the maximum chip thickness this easily shears the workpiece and produce chip. Further less ploughing in down milling reported by authors. The cutting forces and tool wear obtained in 2D FEM are in good agreement with 3D FEM. As per author suggestions, 2D FEM can be used to predict the cutting forces and tool wear instead of 3D FEM. As 3D FEM takes more computational time and it needs high configured system. Davoudinejad et al. [13] predicted the cutting forces, chip flow and burr formation by using 3D FEM while micromilling of aluminium 6061T6. In this study Power Law constitutive model has been used to calculate the flow stress. Model shows the good predictability in terms of chip shape and burr formation while over estimation of cutting forces has been reported. The overestimated cutting forces by FEM simulation attributed to modeling of micro milling in ideal condition, lack of information on the machined material constitutive model inside the FEM and inappropriate selection of friction coefficient. Author suggested the improvement needed in used material model or JohnsonCook constitutive model can be used with proper material constants for Al6061T6.
Pratap and Patra [14] used FEM based modelling to predict the cutting forces while micromilling oxygen free highly conductive copper. ABAQUS/Explicit 6.12 software has been used to predict the forces with due consideration to thermo mechanical properties, tool edge radius effect and failure parameters of the workpiece. It is found that the tangential and feed force increases with increase in chip load. Further, specific cutting forces increases with decrease in feed. Thepsonthi and Ozel [15] used FEM to compare the result by using two different material assumptions namely viscoplastic and elastoviscoplastic while micro end milling of Ti6Al4V. In elastoviscoplastic model, serrated chip formation takes place. It took 8.3 times more duration for the computation compared to the viscoplastic model. However, material assumption has not significantly affected the magnitude of predicted cutting forces. To predict the tool wear, viscoplastic FEM model is sufficient.
Attanasio et al. [16] used FEM to examine the results obtained with and without tool run out while micromilling of CuZn37 brass. It is found that the cutting forces are significantly affected by tool runout. Qualitative comparison of predicted chip shape, chip flow is in close agreement with the chips produced in machining. Wang et al. [17] used finite element simulation to predict machining forces while working on inconel 718. It is found that the minimum uncut chip thickness for inconel 718 is at Feed = 1.5 µm/tooth. Further, they suggested to provide feed higher than critical value. Pratap and Patra [18] analyzed cutting forces while micro end milling Ti6Al4V by using FEM. JohnsonCook material model with material damage initiation criteria has been used for modelling. Experimental and simulated cutting forces are found in good agreement. The value of VonMisses stress and cutting temperature are higher than macro milling, this attributed to the low feed values and effect of tool edge radius. Jin and Altintas [19] predicted micromilling forces with finite element method while processing brass 260. They initially obtained the cutting force coefficient with FE simulations, by using different cutting edge radii and chip loads. Further the force coefficient was used to simulate micro milling forces. A good predictability for normal cutting force while less accuracy for thrust force is reported in their study.
Ti6Al4V is ‘workhorse’ alloy for aerospace applications [20].The demand of Ti6Al4V has been increasing in automotive, power, marine, aeronautic and especially in the medical field from last decade. This is alloy of α + β group with good corrosion resistance, high strength to weight ratio and better biocompatibility. Processing of this alloy is difficult due to its lower thermal conductivity, high friction coefficient and excessive tool wear [21,22]. Formation of built up edge is very common while machining Ti6Al4V. High cutting speed while machining Ti alloy causes increase in cutting zone temperature this leads to accelerate diffusion wear [2,23]. Overall, it has been found that the inappropriate selection of cutting parameters, mainly feed significantly affects the cutting forces, surface roughness and tool wear. It is also keenly noted that the results obtained by 2D FE simulation are matching at satisfactory level with 3D FE simulation in terms of cutting forces and tool wear. Ti6Al4V has wide use to produce micro systems and limited literature has been found related to selection of h/rc ratio for Ti6Al4V. Therefore, in present study 2D FEM is used to predict the VonMisses stresses and cutting forces in micro end milling process. Further, the size effect and the effect of different h/rc ratio on surface roughness has also been studied by measuring surface roughness of machined slots. Micro slots with 20 mm length are cut in Ti6Al4V material by using 800 µm diameter tungsten carbide end mill with cutting edge radius 2 µm. The validity of proposed model is checked by comparing the simulated cutting forces with experimental values, good predictability of the proposed model has been found. Trend suggests a size effect at lower feed values. It is found the provided feed/tooth slightly higher than cutting edge radius produce better surface finish, in present work the feed 2.5 µm/tooth is identified to optimize the cutting forces and surface roughness.
2 FEM modelling of micro end milling
A finite element method based micro end milling model for Ti6Al4V has been developed by using ABAQUS/Explicit 6.12 software. In proposed model the dynamic, explicit and adiabatic condition has been used to analyse the cutting process. FEM has ability to predict cutting forces, chip formation, tool temperature and stress distribution for various cutting condition. The orthogonal micro cutting process with toolworkpiece interaction is shown in Figure 1.
In Figure 1, h represents the uncut chip thickness and r is the edge radius. The point RP represents the reference point to collect the data, tool used for modelling considered as an isothermal rigid body. The initial temperature of tool and workpiece material considered was 298 °K (Room temperature) and dry cutting environment (no lubrication) considered while modelling. In present study, tool can move in X direction while workpiece is fixed in a fixture. Accuracy of simulation is ensured by using mesh size comparable to tool edge radius. The flowchart to predict the cutting forces and VonMisses stress in micro end milling process by using ABAQUS shown in Figure 2.
Fig. 1
Finite element model of micro end milling process. 
Fig. 2
Finite element model flowchart to predict the cutting forces. 
2.1 Material behaviour modelling and properties
Johnson and Cook (J and C) constitutive model has been used in proposed FEM simulation of orthogonal micro end milling process. Equation 1 represent the coupled effect of strain (term1), strain rate (term2) and temperature (term 3) on flow stress of the material (σ) [9].(1) (2)
In equation (1) parameters A, B and n represent the yield strength, strain hardening constant and strain hardening coefficient of the material respectively. C is strengthening coefficient of strain rate ε is the true strain, ε° and ε°_{o} represent equivalent and reference plastic strain rates. T, T_{m} and T_{0} are the cutting zone, melting and room temperatures respectively. Whereas, m is the thermal softening index. Table 1 shows the JohnsonCook model parameters and mechanical properties of Ti6Al4V used in FEM modelling. Equation (2) shows the influence of strain, strain rate and temperature on the calculation of fracture strain of the material. Failure parameters i.e. d1d5 represent the initial failure strain, exponential factor, triaxiality factor, strain rate factor and temperature factor respectively. Failure parameters for Ti6Al4V are given in Table 2. In the present model, if average plastic strain reaches the critical value, the material considers as failed and it will be eliminated at next solver step.
2.2 Material removal mechanism
In micro milling, uncut chip thickness increases from zero to feed per flute. Tool edge radius has strong relationship with material removal mechanism. The probability of elastic deformation in micromachining is considerably higher than macromachining. For the commencement of chip, the value of feed and depth of cut should be higher than critical chip thickness called as minimum chip thickness [5]. If the ratio of uncut chip thickness to cutting edge radius is less than unity, it causes ploughing (elastic deformation of material increase cutting forces) while more than unity values promotes the chip formation. However, higher ratios of uncut chip thickness to cutting edge radius can increase cutting forces by increasing chip load. Equation (3) shows that in micro end milling, the uncut chip thickness (h) is associated with feed per tooth (f_{t}) and rotation angle (ϕ). The direction of cutting forces in micro end milling for two fluted end mill shown in Figure 3. F_{y} and F_{x} represent the cutting force normal to feed and along feed direction respectively, Whereas f_{t} is feed per tooth. dF_{f} and dF_{t} represent the feed force and tangential force respectively. Equation (3) and Figure 3 shows in micro milling h is directly associated with f_{t.}(3)
Fig. 3
Micro end milling process with two fluted end mill. 
2.3 FEM simulation of cutting forces
Micro end milling process simulation has been performed for nine numbers of runs, by using tungsten carbide end mill having diameter 800 µm and cutting edge radius 2 µm. The feed rate is varied keeping all other parameters constant. Moreover, variations in VonMisses stress, tangential force, feed force and specific cutting force are analysed with respect to feed. The cutting simulation parameters are shown in Table 3.
In FEM based simulation, yield criteria and fatigue strength of the material are estimated by analysing VonMisses stresses. Figure 4 shows simulated result of VonMisses stress distribution for the feed 0.5 µm/tooth, 3 µm/tooth, 6 µm/tooth respectively.
From Figure 5, it is found that at the lower values (0.5–1.5 µm/tooth) cutting tool experienced more difficulty for the chip formation. Moreover, the VonMisses stress distribution at lower feed had shown higher value of stresses than the feed value equal to cutting edge radius i.e. 2 µm. The value of VonMisses stress decreases as the feed approaches the cutting edge radius. This suggest at lower feed the phenomenon of ploughing is dominating. The ploughing or rubbing occurring at lower feed increases the stress values. When feed value equals to cutting edge radius, material removed by elastoplastic deformation. Beyond 2 µm/tooth feed, the value of stresses reduced significantly, this attributed for elimination of elastic deformation and removal of material entirely by plastic deformation. Further, by increasing the feed value above 3 µm/tooth stress values increases considerably, increasing the chip load at higher feed generates higher stress value similar to macromachining. The stress values obtained after 4 µm/tooth are higher than the stress value obtain at low feed (0.5 µm/tooth).
Tangential force (F_{t}) and feed force (F_{f}) are calculated by using equations (4) and (5) given below. F_{x} and F_{y} are the simulated force along X and Y direction respectively. ϕ is the positioning or rotation angle of end mill flute. Figure 6 shows the variation in tangential force and feed force with feed. At lower feed no significant variation in cutting force has been found, but the values of cutting forces reducing as the provided feed value approaching the cutting edge radius. Higher value of cutting forces for feed 0.5 µm/tooth − 1.5 µm/tooth suggests the occurring of ploughing at low feed values. As the provided feed increased beyond 2 µm/tooth, ploughing eliminated and chip produced by plastic deformation. As the feed increases 3 µm/tooth to 6 µm/tooth the values of tangential force increases directly with feed. The rate of change of tangential force with feed significantly higher than feed force. The values of feed force are increasing slightly with feed. Increased values of tangential force with feed attributed to increase in chip load at higher feed. The value of feed slightly higher than cutting edge radius producing lower value of cutting forces.(4) (5)
To study the size effect in micro end milling process, specific cutting force was calculated by dividing the tangential and feed force by the product of chip load and axial depth of cut. In Figure 7 it is found the value of specific cutting force increased with decrease in the ratio of undeformed chip thickness to cutting edge radius. Higher values of specific cutting force has been observed when ratio of undeformed chip thickness to cutting edge radius was less than 1, this suggest the ploughing occurred at low feed rate. This trend of specific cutting force shows agreement with results obtained by Aramcharoen and Mativenga [6].
Cutting parameters used for FEM simulation of micro end milling.
Fig. 4
Predicted VonMises stress distribution at spindle speed of 60,000 rpm, depth of cut 50 µm and (a) 0.5 µm/tooth, (b) 3 µm/tooth and (c) 6 µm/tooth. 
Fig. 5
Variation of maximum VonMises stress with feed. 
Fig. 6
Variation in tangential force (F_{t}) and feed force (F_{f}) with feed (simulated results). 
Fig. 7
Variation in specific cutting forces with ratio of undeformed chip thickness to cutting edge radius. 
3 Experimental validation
In this section, the details of workpiece material, cutting parameters, micro milling set up and measurement of cutting force has been presented. Simulated and experimental cutting forces are compared and percentage error calculated. Further, the surface roughness of machined slots measured and effect of different ratio of h/rc on Ra has been presented.
3.1 Experimental details
Schematic representation of high speed micro end milling set up is shown in Figure 8. In present study, Ti6Al4V (grade 5) workpiece with dimension 60 × 40 × 5 mm has been used.
Axis made micro tungsten carbide end mill with diameter 800 µm and 10% of cobalt binder has been used for cutting in dry environment. Slots of 20 mm length and 800 µm diameter are cut on workpiece. Kistler made minidyne 9256C1 dynamometer has been used to measure the cutting forces. The cutting forces while milling measured by fixing the workpiece on the top of dynamometer. Three dimensional Alicona surface profilometer has been used to measure the surface roughness (Ra). Surface roughness is measured at two locations on machined slot i.e. at the starting and ending of the slot and average of that value taken as final Ra value for the respective experiment. Cutting parameters used to produce the slots on Ti6Al4V workpiece are presented in Table 4.
The actual experimental set up used in proposed work shown in Figure 9a while Figure 9b shows the machined slots on Ti6Al4V workpiece. High speed micro milling set up designed and developed by IIT Bombay has been used for machining. It has maximum 140,000 rpm spindle speed and average torque of ∼4.3 Ncm. All three stages are mounted on granite rigid structure. The whole micromachining center is placed on the vibration isolation table. The xy stages are actuated by ball screw mechanism driven by a DC brushless servomotor.
Fig. 8
Schematic representation of high speed micro end milling set up. 
Cutting parameters used for micro end milling.
Fig. 9
(a) Micromilling set up and (b) machined Ti6Al4V alloy. 
3.2 Model validation
To check the predictability of proposed model, the experimental F_{y} (force normal to feed) and F_{x} (force along feed) are compared with simulated forces. The simulated and experimental forces at cutting speed 60000 rpm, depth of cut 50 µm and feed 0.5, 2, 2.5 and 4 µm/tooth are compared in Figure 10.
It is found that the predicted and experimental cutting forces are in good agreement. However, small difference between the values of simulated and experimental forces can be attributed to the tool wear, tool dynamics and small defects (crystal defects and impurities) associated with workpiece material. As in present work tool is considered as rigid body and defects associated with material are difficult to eliminate. Moreover, in actual machining tool wear and tool dynamics causes variation in cutting forces.
Table 5 shows the experimental and simulated cutting force values by considering the average of peak values of cutting force. It also shows the error between predicted and experimental cutting force. The maximum and minimum error for F_{y} is 11.84 and 3.57% respectively. Similarly the maximum and minimum error for F_{x} is 15.17 and 4.61% respectively.
In micro milling, low values of feed deteriorate the surface by ploughing, whereas higher value of feed may increase the surface roughness by increasing chip load [6]. Therefore, to identify the right h/rc ratio, Ra value of selected machined slots has been measured. Figure 11 shows the machined slot of 0.25, 1.25 and 2 h/rc ratio respectively and Figure 12 shows the effect of different h/rc ratio on Ra.
Figure 12 shows as the h/rc ratio approaching to the unity, the value of surface toughness decreasing. Just beyond the unity the obtained Ra value is significantly lower, while at 2 h/rc ratio the higher value of surface roughness has been observed. The Ra value obtained at 0.25 h/rc ratio is significantly affected by ploughing mechanism, Figure 11a shows the elastically deformed marks on the machined surface. At 1.25 h/rc ratio, the elastic deformation of material eliminated entirely and material removed by plastic deformation. At unity ratio, material removed by elasticplastic deformation this attributed to little higher value of Ra at unity than 1.25 h/rc ratio. Figure 11b shows the machined slot at 1.25 h/rc ratio, the obtained surface has quite less roughness value. Similarly Figure 11c shows the surface obtained at 2 h/rc ratio, the Ra value obtained at this ratio is significantly higher. The unsymmetrical feed marks on the machined surface suggest the generation of high cutting forces at higher feed/tooth. The increased chip load at higher feed leads to high tool deflection, chatter and tool run out. Feed/tooth is one of the significant parameter for surface roughness. Higher feed value increases the tool wear which leads to rounding of cutting edge and geometrical inaccuracies. In the present work cutting edge radius is 2 µm, therefore the provided feed around 2.5 µm/tooth (h/rc ratio is 1.25) is suitable to produce lower surface roughness value. The obtained results shows agreement with recommendation given by K and Mathew's while micromilling of Ti6Al4V [25] according to them to optimize the surface roughness the selection of feed/tooth slightly higher than cutting edge radius is appropriate.
Fig. 10
Comparison of experimental and simulated cutting force at cutting speed 60,000 rpm, depth of cut 50 µm and feed 0.5, 2, 2.5, 4 µm/tooth. 
Experimental and simulated cutting force value.
Fig. 11
Machined slot for h/rc ratio (a) 0.25 (b) 1.25 (c) 2. 
Fig. 12
Effect of uncut chip thickness to cutting edge radius ratio on surface roughness (Ra). 
4 Conclusion
The ratio of uncut chip thickness to cutting edge radius is one of the significant parameter in micro milling. The appropriate selection of this ratio can reduce the cutting forces, surface roughness and tool wear by avoiding ploughing mechanism and over chip load. Limited application of FEM has been observed to predict ratio of uncut chip thickness to cutting edge radius in micro milling. Therefore in present work, the model developed by ABAQUAS/Explicit 6.12 used to predict the cutting forces while machining Ti alloy by using JohnsonCook equation. The proposed model shows the effect of different feed on VonMisses stress, tangential force and feed force. The effect of different h/rc ratio on surface roughness and specific cutting force also has been studied. On the basis of conducted study following conclusion can be drawn.
Lower value of VonMisses stress generates on machined surface and it increases toward cutting edge of the tool. Higher force required at cutting edge to produce the chip in cutting zone.
As the feed value approaches the cutting edge radius ploughing avoided and just beyond cutting edge radius material removed completely by plastic deformation. Tangential force increased with feed after 3 µm/tooth, this attributed to increase in chip load at higher feed. The rate of change of tangential force considerably higher than feed force.
FEM simulation for VonMisses stress and specific cutting force shows size effect at lower feed.
Cutting forces predicted by FEM simulation are in good agreement with experimental forces. Forces predicted by FEM model are 85–96% confidence level.
To optimize the surface roughness, set the feed per tooth value slightly higher than cutting edge radius of the tool. At this feed elastic, elasticplastic deformation eliminated completely and material removed by plastic deformation. In the present work, the provided feed around 2.5 µm/tooth (h/rc ratio is 1.25) is found suitable to produce optimum surface finish and cutting forces.
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Cite this article as: Narendra Bhople, Sachin Mastud, Satish Satpal, Modelling and analysis of cutting forces while micro end milling of Tialloy using finite element method, Int. J. Simul. Multidisci. Des. Optim. 12, 26 (2021)
All Tables
All Figures
Fig. 1
Finite element model of micro end milling process. 

In the text 
Fig. 2
Finite element model flowchart to predict the cutting forces. 

In the text 
Fig. 3
Micro end milling process with two fluted end mill. 

In the text 
Fig. 4
Predicted VonMises stress distribution at spindle speed of 60,000 rpm, depth of cut 50 µm and (a) 0.5 µm/tooth, (b) 3 µm/tooth and (c) 6 µm/tooth. 

In the text 
Fig. 5
Variation of maximum VonMises stress with feed. 

In the text 
Fig. 6
Variation in tangential force (F_{t}) and feed force (F_{f}) with feed (simulated results). 

In the text 
Fig. 7
Variation in specific cutting forces with ratio of undeformed chip thickness to cutting edge radius. 

In the text 
Fig. 8
Schematic representation of high speed micro end milling set up. 

In the text 
Fig. 9
(a) Micromilling set up and (b) machined Ti6Al4V alloy. 

In the text 
Fig. 10
Comparison of experimental and simulated cutting force at cutting speed 60,000 rpm, depth of cut 50 µm and feed 0.5, 2, 2.5, 4 µm/tooth. 

In the text 
Fig. 11
Machined slot for h/rc ratio (a) 0.25 (b) 1.25 (c) 2. 

In the text 
Fig. 12
Effect of uncut chip thickness to cutting edge radius ratio on surface roughness (Ra). 

In the text 
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