Finite Element Method (FEM) simulation of static and dynamic compression test of materials

• Main Author: Lim, Soon Ji
• Other Authors: Shu Dong Wei, David
• Format: Final Year Project
• Language: English
• Published: 2018
• Subjects: DRNTU::Engineering
• Online Access: http://hdl.handle.net/10356/74824
• Institution: Nanyang Technological University

Material behaviour has always been an area of research because it is essential to know how materials behave under quasi-static or dynamic loading to ensure safety and reliability in various mechanical applications. Material behaviour can be quantified by strain rate, deformation rate and stress-strain experienced by the specimen. ASTM E9-09 Static compression test and Split Hopkinson Pressure Bar test are the most commonly used method to determine the material properties of the specimen. This report seeks to use Finite Element Method (FEM) to model compression test ASTM E9-09 (Static) and Split Hopkinson Pressure Bar Test (Dynamic) to investigate the material properties in Aluminium 6061T by means of a simulation software. Ansys workbench 18.1 will be used with Static structural (APDL Mechanical Solver) and Explicit dynamics (LS-DYNA Solver) as its analysis system to simulate static and dynamic compression of the specimen. In the modelling of ASTM E9-09 simulation. Two plastic models, bilinear isotropic hardening, and multilinear isotropic hardening were investigated, Stress-strain curve is generated to calculate Young’s Modulus and Yield strength of the material. The specimen is created with a surface taper angle error on purpose to investigate the manufacturing defect. Varying friction coefficient on the surface of the specimen and the effects of lubrication on the specimen during compression were investigated In the modelling of Split Hopkinson Pressure Bar Test (SHPB) simulation. The plasticity model used was Johnson Cook Model. Material properties of Aluminium 6061T’s Stress vs strain graph, strain rate vs time graph, strain vs time graph and stress vs time graph were investigated. Results generated by SHPB Method and Nodal Analysis of the specimen was compared and experimental results conducted in the lab was referred for validation. Striker velocity and the diameter of the specimen in SHPB is varied for repeatability test and the investigation of the material properties.