Experimental Study of the Effect of Triaxiality Ratio on the Formability Limit Diagram and Ductile Damage Evolution in Steel and High Purity Copper

Abstract

In this contribution, the effect of the stress state (by mean of the triaxiality ratio) on the equivalent plastic strain at fracture is experimentally investigated for different steels and high purity copper in the range of triaxiality from 0 (pure torsion) up to 1.2. This range of stress state is particularly meaningful for the majority of the mechanical applications. The prediction on the formability limit diagram for proportional loading paths (i.e. with constant triaxiality) is verified in the framework of Continuum Damage Mechanics (CDM) using the LemaitreChaboche's damage model. Furthermore the influence on triaxiality on the threshold plastic strain for damage initiation and for the critical damage at rupture is experimentally studied. The results are compared with the prediction of the aforementioned damage model. A very good agreement between experimental results and CDM prediction is achieved.

Carbon nanotube reinforced metal binder for diamond cutting tools

“…The experimentally obtained stress-strain curves were introduced in the model. For the estimation of damage initiation, the ductile damage criterion was assumed for both Cu and Fe based phases, with the strain of fracture versus triaxiality functions obtained from [26]. Fig.…”

Predicting ballistic impact failure of aluminium 6061-T6 with the rate-independent Bao–Wierzbicki fracture model

“…Different conclusions have been drawn in Ref. [23] where ferritic steel, carbon manganese steel vanadium and 99.9% pure copper do not to exhibit a minimum in the fracture locus for zero triaxiality.…”

Numerical simulation of self-piercing riveting process (SRP) using continuum damage mechanics modelling

“…OFHC 99.8% Cu has been characterized extensively for application in the dynamic deformation range. [21][22][23][24][25][26][27]. Bonora et al [28] determined the BDM model parameters for OFHC CU in the fully annealed state.…”