Computationally Efficient Damage and Residual Strength Predictions Using Progressive Damage Failure Analysis (PDFA) with an Enriched Shell Element

摘要

An important aspect of the design of composite structures is certification fordamage tolerance. Current certification involves tests for low velocity impact (LVI)damage, and the residual compression strength after impact (CSAI). In this work, anadaptive fidelity shell (AFS) model is used to simulate this mutli-step LVI/CSAIprocess, improving previous LVI results. The two-step process is simulated to ensurethat the damage is transferred correctly from one step (LVI) to the next (CSAI)correctly. Use of this model will enable efficient large-scale simulations of fullstructures with accurate estimations of damage and strength. The AFS model was usedto simulate LVI and CSAI for two laminate stacking sequences from the ONR highfidelity database. The model shows promise, but further development is needed tofully capture damage processes seen in LVI/CSAI.