The main purpose of this study is to develop a variational formulation for predicting structure behavior and accounting damage mechanics in metallic materials. Mechanical coupled thermomechanical models are used predict failure manufacturing processes. Ductile accompanied by significant amount plastic deformation structural components. Finite element simulation evolution ductile solids presente...

hydro-forming is a fabrication process that uses a fluid medium to form a piece by using high internal pressure. in tube hydro-forming, a tubular blank is placed between two dies, sealed and pressurized water injected, deforming the tube walls in the cavity form of the dies. exist several typical hydro-forming processes such as t- shapes, cross-shapes and y- shapes. successful hydro-forming dep...

Ductile iron is one of the most important engineering materials, in view of its excellent castability, signifi cantly better mechanical properties and low cost [1, 2]. It represents the fastest growing segment of the iron market. In the medium term, it is to be expected that the market share of nodular iron will level off at 40 % to 45 % [3]. Achieving the full potential of ductile iron require...

This study presents a probabilistic, 3-D framework to describe brittle fracture in structural components which incorporates weakest link statistics and a micromechanics model reflecting local damage of material. The Weibull stress (a,) emerges as a fracture parameter to define conditions leading to local material failure. This parameter is correlated with the macroscopic loading and used to des...

The bipotential theory is based on an extension of Fenchel’s inequality (see section 1 and example 1 in section 2). Despite several powerful applications (frictional contact [6], non-associated Drucker-Prager model [1], or Lemaitre plastic ductile damage law [2], to cite a few), the bipotentials don’t have yet a complete mathematical treatment. This is a second paper on the mathematics of the b...

Abstract In order to replace the conventional alloys with bulk metallic glasses (BMGs), studies have been actively conducted investigate mechanical characteristics of BMGs in various aspects. One major ongoing issues is process-related variations key properties such as fracture toughness. Although there still a lack knowledge on how prevent catastrophic failure most BMGs, Griffith’s theory, mod...

Sheet metal forming as well mechanical joining demand increasingly accurate and efficient material modelling to capture large deformations, the inherent sheet orthotropy even process-induced damage, which is expected be influential. To account for strains additive logarithmic strain space utilised that enables a straightforward incorporation of plastic anisotropy, herein modelled by Hill48 yiel...