Progressive Failure Analysis in Platelet Based Composites Using CT-Measured Local Microstructure
Comparison of microstructurally accurate digital twin tensile specimen failure simulations with their real-world counterpart tensile specimen experimental results is performed. Five tensile specimens are cut from a 250x250 mm plate that is compression molded from a thermoplastic, prepreg, unidirectional fiber, platelet based material system. Meso-scale resolution CT scans of these specimens are used to perform density-gradient-based local fiber orientation analysis. The orientation analysis results are then used to map a local orthotropic material coordinate system for every element in a FE mesh. A continuum damage mechanics based material model is used to track damage progression in virtual tensile coupons with finite element analysis. A single orthotropic material is defined for use in all elements. The material mechanical properties are taken from the platelets parent material. Ultimate failure location from progressive failure analysis results compare favorably with tensile experiments of the CT scanned tensile specimens.
Authors: Benjamin R. Denos, Sergii G. Kravchenko, and R. Byron Pipes
Conference: SAMPE Seattle 2017