FRACTURE CRITERION FOR PREDICTING SURFACE CRACKING OF AA2017 ALLOY IN SEMI-SOLID FORMING PROCESS

Volume 20 No 12 (2022)

CH Shashikanth and G.Venkateswarlu M. J. Davidson

DOI: 10.14704/NQ.2022.20.12.NQ77074

Abstract

AA2017 aluminium alloy billets were compressed till the appearance of crack on semi-solid compression tests conducted at 570 0 C, 590 0 C and610 0 C under strain rates of 0.16s-1 ,0.18s-1 ,0.2s-1 to establish the fracture criterion duringsemi-solid forming process. The tests conditions were simulated in a finite element based simulation package DEFORM 2D. The critical damage factor based on Cockcroft and Latham algorithm were obtained by analyzing the results of the corresponding finite element calculation. The results show thatthe critical damage factor at different temperatures and strain rates is not constant but varying between 0.471to0.264.The Zener-Hollomon parameter which combines the effect of temperature and strain rate has been introduced in to the fracture criterion

Keywords

solid forming, AA2017, FEM

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