October 21, 2016 | by DatapointLabs | views 6251
Plastics exhibit non-linear viscoelastic behavior followed by a combination of deviatoric and volumetric plastic deformation until failure. Capturing these phenomena correctly in simulation presents a challenge because of limitations in commonly used material models. We follow an approach where we outline the general behavioral phenomena, then prescribe material models for handling different phases of plastics deformation. Edge cases will then be covered to complete the picture. Topics to be addressed include: Using elasto-plasticity; When to use hyperelasticity; Brittle polymers – filled plastics; Failure modes to consider; Criteria for survival; Choosing materials; Spatial non-isotropy from injection molding; Importance of residual stress; Visco-elastic and creep effects; Strain-rate effects for drop test and crash simulations; Fitting material data to FEA material models; The use of mid-stage validation as a tool to confirm the quality of simulation before use in real-life applications.
Hubert Lobo, President, and Brian Croop, Laboratory Director, DatapointLabs Technical Center for Materials
Presentations delivered as part of a short course prepared for the Western Pennsylvania ANSYS User's Group Fall 2016 Meeting on October 21, 2016, in Canonsburg, PA USA.
Density Rheology Thermal Mechanical Plastics Rubbers Hyperelastic Viscoelastic Plasticity Rate Dependency Yielding/Failure Analysis Injection Molding Structural Analysis ANSYS Presentations Validation
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