A framework for development of constitutive models based on semi-micromechanical aspects of plasticity is proposed. The resulting of this model for material employed friction type failure criterion, sub-loading surface, and associated flow rule. This model is capable of predicting effects of the rotation of principal stress/strain axes and consequent plastic flow, induced anisotropy of strength...

In this work, dynamic mechanical properties of three high-manganese steels with TRIP/TWIP or fully TWIP characteristics are studied. High strain rate experiments in the range of true strain rates between ~500 and 1800 /s are conducted using a dynamic torsional testing setup. All the three steels show a positive strain rate sensitivity in the intermediate range of strain rates (up to 500 /s). Bu...

The material properties of OFHC copper film was investigated with the High-Speed Material Micro Testing Machine (HSMMTM) at the high strain rates. The rate-dependent stress-strain curves from the experiment and the Johnson−Cook curve fitting showed large discrepancies as the plastic strain increases since the constitutive model implies no rate-dependent strain hardening effect. A new constituti...

The triaxiality of the stress state is known to greatly influence the amount of plastic strain which a material may undergo before ductile failure occurs. It is defined as the ratio of hydrostatic pressure, or mean stress, to the von Mises equivalent stress. This paper discusses the effects of stress triaxiality on yielding behavior of anisotropic materials. Hill-von Mises’s criteria for anisot...

Strain path transition is a common phenomenon during continuous stamping operations of sheet metal and can potentially alter the forming limit material. Enabling strain change in single experiment key challenge faced by several researchers. To understand effect on material limits, detailed characterisation needed where deformed while changed continuously. In this work, test method was developed...

Carbon steel low have nature mechanical specifically capable good form. Capability form on influenced by various factor among them that is thickness. Influence different thickness give effect significant to described through Forming Limit Curve (FLC) or curve limit formation. an important parameter for knowing a material. So, it's influence in the resulting (FLC). The material used test this ca...

Bulk metallic glasses exhibit high strength and large elastic strain limit but have no tensile ductility. However, bulk metallic glass composites reinforced by in-situ dendrites possess significantly improved toughness but at the expense of high strength and large elastic strain limit. Here, we report a bulk metallic glass composite with strong strain-hardening capability and large elastic stra...

The continuous monitoring of strain in fiber-reinforced composites while service typically requires bonding a network sensors to the surface composite structure. To eliminate such needs, and reduce bulk limit additional weight, this work utilizes transfer printing laser induced graphene (LIG) gauges onto commercial fiberglass prepreg for situ self-sensing strain. resultant embedded sensor is en...