Title: STATIC AND FATIGUE SIMULATION OF T800H/2500 COMPOSITES WITH NON STANDARD LAYUP
Abstract: Durability and damage Tolerance (D&DT) Simulation of T800H/2500 coupons subject to off axis non-negative mean stress of unidirectional carbon/epoxy composites at room temperature was validated with: 1) Static, and Fatigue tests. The Multi-Scale Progressive Failure Analysis (MS-PFA) simulation is capable of performing micro-mechanical material characterization including effect of defects using both static and fatigue properties. Generally, a reverse engineer process of ply /lamina test data is performed to derive fiber and matrix constituents: a) Static linear, nonlinear (stress-strain) curve, and b) fatigue (stress-cycle) properties. Six constant stress layups were simulated and compared with static tests, fatigue tests for both tension and compression fatigue behavior. Damages mechanism types and percent contribution were tracked throughout the loading and the results of the micromechanics were coupled with FEM via UMAT (user material subroutine) to show the results can be scaled up to the part level. All simulation agreed with test. The approach utilizes a dehomogenized (fiber, matrix, interphase) micromechanical analytical method that accounts for voids, gaps, fiber waviness, defects, and environmental conditions like temperature and moisture. The characterized material then compared with static and fatigue laminate coupon tests showing: a) material off -axis behavior resulting in damage evolution (initiation, propagation) contributing failure mechanisms (i.e., delamination types), and b) coupon test fracture initiation and propagation coupled with FEM.
Authors: Frank Abdi, Saber DorMohammadi, Cody Godines, Mehdi Salimi Jazi,
Conference: CAMX 2017 –Orlando