MICROMECHANICS BASED RVE

Feifei Cheng and J. N. Reddy

Temperature-Dependent Thermal Properties of a Shape Memory Alloy (SMA)/MAX Phase Composite

 
Micromechanics based representative volume element (RVE) and finite element method was used to predict the thermal conductivity of NiTi/TiSiC composite. The influence of porosity and interface thickness on heat transfer within NiTi/TiSiC composite was investigated.
 

• 3D representative volume element (RVE) models of NiTi/Ti3SiC2 composites (a) Configuration-A with porosity (grey- pores, pink- NiTi, transparent – Ti3SiC2) (b) Configuration-B with porosity and interface layer (grey – pores, pink – NiTi, transparent- Ti3SiC2, and cyan- interface layer)

• Iso-surface of the heat flux (unit: 10^-6 W/µm^2) along y direction for Ti3SiC2 and NiTi in the NiTi/Ti3SiC2 composite under two different configurations: A and B.

Modeling of Elastoplastic Behavior of Stainless-steel/Bronze Interpenetrating Phase Composites with Damage Evolution

 
In this study, an elastoplastic finite element model for stainless-steel/bronze interpenetrating phase composites (IPCs) with damage evolution is proposed. Detailed 3D representative volume element (RVE) finite element models are generated based on the microstructure of the IPCs to study the mechanical and thermal expansion properties of stainless-steel/bronze IPCs. Gurson-Tvergaard-Needleman (GTN) constitutive model is adopted to investigate the influence of porosity on the elastoplastic and evolutionary damage behavior of composites under uniaxial tension.
 

• Axial stress distribution of 80% IPC (stress unit: 10^6MPa): (a) Stainless-steel phase and (b) Bronze phase

• Equivalent plastic strain distribution of 60% IPC: (a) Stainless-steel phase and (b) Bronze phase.