Abstract The ductile fracture behavior of a high strength steel is investigated using micromechanics-based approach with the objective to build predictive framework for strain and crack propagation under different loading conditions. Part I this study describes experimental results determination elastoplastic damage nucleation stress triaxiality Lode parameter values. mechanism starts early voi...

This study is devoted to the modelling of ductile damage in uranium dioxide. This polycrystalline material contains two populations of voids of well separated size. The problem addressed here is the prediction of the effective flow surface of a Gurson material containing randomly oriented oblate voids. The case of spherical voids is considered first and the variational approach of Gurson is gen...

This study aims to investigate the formability of AA2198-T3 Al-Li alloy in hydro-mechanical deep drawing (HMDD), through experimentation and finite element simulation. The effects most critical factors were studied: die cavity pressure forming temperature; temperature is selected at 298K 423K. Gurson?Tvergaard?Needleman model (GTN model) was employed analyze predict fracture hydroforming a cyli...

Metal-based composites can fail as a consequence of the growth and coalescence micro-voids introduced with manufacturing process. These detrimental phenomena influence overall performance material to different extents since macroscopic characteristics depend on both local constitutive properties geometry patterns, which promote various stress concentration strain localization effects. The under...

This study investigates the deformation and fracture mechanisms of two testing methods, tension under cyclic bending (TCB) plus compression (TCBC) their relationship to single point (SPIF) double-sided (DSIF) incremental sheet forming processes. Experimental tests were carried out by using a bespoke TCBC test rig DSIF machine with grade 1 pure Ti samples. The results show elongation-to-fracture...

To clarify the applicability of Gurson-Tvergaard-Needleman (GTN) model for impact ductile fracture behaviour, SHB test was reproduced by finite element analysis (FEA). The strain-rate dependence strength austenitic stainless steel JIS SUS304L obtained tensile tests at quasi-static strain rate and rate. CowperSymonds power law, which takes into strength, GTN implemented in commercial FEA code we...

Micro-scaled progressive sheet metal forming is a promising process for producing bulk microparts, given its advantages of high efficiency and low cost. To enhance quality efficiency, it important to have an in-depth understanding the mechanism model fracture behavior accurately. However, prediction formation in materials at micro-scale has not yet been well explored, thus current knowledge suf...

The Gurson–Tvergaard–Needleman (GTN) damage model is widely used to predict ductile failure initiation and propagation. However, the material-dependent parameters can show a significant spread when determined for same steel grade material. Different calibration procedures optimisation processes cause variation in obtained parameter values. Furthermore, there no clear consensus on which require ...

This work is focused on the numerical prediction of the fracture resistance of a flat stiffened panel made of the aluminium alloy 2024 T3 under a monotonic traction condition. The performed numerical simulations have been based on the micromechanical Gurson-Tvergaard (GT) model for ductile damage. The applicability of the GT model to this kind of structural problems has been studied and assesse...