Steady State Tearing in Thin Aluminium Sheets under Uniaxial Tension

摘要

Experimental data on the Steady State Tearing (SST) in middle-cracked tension specimens of different geometry are examined with the use of global parameters characterizing the mechanical behavior of a "moving crack tip" embedded into a fully developed "moving neck". They both spread across the ligament under different levels of constraint produced by varying the in-plane geometry of specimens. The proposed criteria of attaining the SST stage are expressed in terms of averaged quantities, which enable accounting for the plasticity and damage effects immediately from test records.