Frictional behavior during cold ring compression process of aluminum alloy 5052

Zhang, Dawei; Yang, G.-J.; Zhao, Shengdun

doi:10.1016/j.cja.2020.07.030

Cited by 24 publications

(2 citation statements)

References 29 publications

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“…In the modeling of bulk metal forming, there are a few options to choose from, such as the Coulomb friction law [15][16][17], the constant shear (Siebel) friction law [18][19][20][21][22][23][24], both Coulomb and constant shear friction laws [25,26], general ones [27][28][29] or the integrated law, i.e., Coulomb constant shear friction law [9,14,[30][31][32][33]. Being naturally more flexible and, hence more relevant to real-life manufacturing than conventional Coulomb and constant shear friction laws, the Coulomb constant shear friction law is widely used in FEA of metalworking.…”

Section: Introductionmentioning

confidence: 99%

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Derivation of the Coefficients in the Coulomb Constant Shear Friction Law from Experimental Data on the Extrusion of a Material into V-Shaped Channels with Different Convergence Angles: New Method and Algorithm

Bobrovskij

Khaimovich

Bobrovskij

et al. 2022

Metals

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The combined Coulomb constant shear friction law is widely used in commercial and research software for the finite-element analysis (FEA) of metalworking and is naturally more flexible and hence, more relevant to real-life manufacturing than the individual Coulomb and constant shear friction laws. In this work, a new mathematical model of coefficients in the Coulomb constant shear friction law for extruding a metal through narrow V-shaped channels with small convergence angles has been developed and evaluated and compared with laboratory measurements. The extrusion of the model material (lead) through narrow V-shaped channels with small convergence angles varying from 0 to 3.5 degrees has been studied. The Coulomb friction coefficient µ and the constant friction factor m appear to be independent of the dimension ratio and are influenced mostly by roughness and range from µ = 0.363 (with lubricant) to µ = 0.488 (without lubricant) and from m = 0.726 (with lubricant) to 0.99 (without lubricant). The relative length dominated by the Coulomb friction law is less than 1%, and the Coulomb’s coefficient of friction can be approximated as ½ the constant shear friction factor for all tested cases. The developed method and algorithm can be used in both FEA of manufacturing processes and efficiency tests for lubricants used in metalworking.

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Section: Introductionmentioning

confidence: 99%

“…In order to determine the friction coefficients, classical experiments on the upsetting of a ring-shaped workpiece between flat plates have been performed [25,26,34,35]. In [36], a method of the derivation of the friction coefficients from measurements on the upsetting of a cylindrical workpiece at high strain rates was reported.…”

Section: Introductionmentioning

confidence: 99%