Evaluation of ls-dyna mat162 for modeling composite fastener joints for high rates of loading
Kona Ravi, Aswini; Bhasin, Akhil; Gomez, Leandro; Olivares, Gerardo; Gomez, Adrian; Keshavanarayana, Suresh R.; Pang, Jenna K.; Molitor, Matthew; Rassaian, Mostafa. 2019. Evaluation of ls-dyna mat162 for modeling composite fastener joints for high rates of loading. AIAA Scitech Forum: Session: NASA ACC Section for High Energy Dynamic Impact
In the present work, the behavior of composite-fastener joints in bearing failure at dynamic stroke rates of 500 in/s, 300 in/s and 100 in/s has been evaluated through progressive damage analysis (PDA) material model in LS-DYNA, namely MAT162. Two joint types: pin and fastener, representative of fastener used in aerospace structures, were analyzed to identify the differences between without and with preload conditions. A meso-level approach where each lamina was modeled separately was employed and a contact definition based on fracture toughness data was defined to represent composite delamination behavior. Test fixture had been modeled in a detailed manner to account for the dynamic effects and the simulation results were validated against experimental data. Preliminary test-analysis correlation indicated that MAT162 predicted results conservatively when compared to tests. Debris accumulation were observed to greatly affect the test results which were not considered in the current modelling strategies.