GMW GMW16944 PDF

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose. To capture the effects of strain rate on thermoplastics using these test methods so that simulations can accurately reflect these behaviors. In a material strained at automotive crash rates, the onset of yielding and failure can be very different than if it were strained at quasi-static rates typically used in test labs and in material supplier data sheets. Finite element analysis using material models defined from the test data obtained via the methods described herein are used to simulate and therefore predict the mechanical deformation and failure of thermoplastics across a range of strain rates and temperatures.

Foreword. General Motors effectively uses high strain rate test data to describe and successfully predict the results of crash events.

These methods provide a way to obtain high strain rate physical properties of unreinforced and reinforced injection molded thermoplastics for the purpose of calibrating mathematical material models in finite element analysis codes. The material models specifically targeted in this standard are used in the analysis of automotive crash events. The rates of material straining are those typically associated with crash events. Materials that exhibit significantly different material properties in the mold filling flow direction from the mold filling cross-flow direction will require that data be generated in both directions.

Applicability. The data obtained shall be used to generate material models for finite element analysis of injection molded thermoplastics undergoing automotive crash events.