Abstract

A study on the fracture and damage-healing behavior of plain woven textile composite (PWTC) is performed in the present work. The primary objective is to conduct 2D progressive failure analysis (PFA) under static in-plane loading conditions, progressive damage-healing analysis for different cyclic strain histories, and experimental fracture studies of PWTC material. A chain of equivalent cross-ply laminates (ECPL) consisting of warp and fill plies is considered as the modified representative volume element (RVE) of PWTC distributing matrix phase within warp and fill yarns. The 2D PFA, based on classical laminate theory (diffused cracking) by eliminating stiffness terms, is performed applying maximum stress theory to predict the macro-scale stress-strain behavior of PWTC. The 2D PFA of PWTC material behavior is implemented as ABAQUS^® user material subroutines (UMAT and VUMAT), and the fracturing of PWTC notched bar is demonstrated for an illustration purpose. The novel multi-scale progressive damage-healing analysis is subsequently performed, by $4^{th}$-order damage-healing effect tensor, applying Voigt approximation on ECPL model (self-healing in warp ply for an illustration purpose). The failure modes identified in numerical PFA are verified performing in-house experiments (through fractography).

摘要

在目前的工作中，对平纹织物复合材料（PWTC）的断裂和损伤愈合行为进行了研究。主要目标是在静态平面内加载条件下进行二维渐进式失效分析 (PFA)、不同循环应变历史的渐进式损伤修复分析以及 PWTC 材料的实验断裂研究。由经纱和纬纱组成的等效交叉层层压板 (ECPL) 链被认为是 PWTC 在经纱和纬纱中分布基体相的改进代表体积元 (RVE)。2D PFA，基于经典层压理论（扩散开裂），通过消除刚度项，应用最大应力理论来预测宏观尺度PWTC的应力-应变行为。PWTC 材料行为的 2D PFA 被实现为 ABAQUS ^®用户材料子程序（UMAT 和 VUMAT），并演示了 PWTC 缺口杆的断裂以进行说明。随后进行了新颖的多尺度渐进式损伤修复分析，通过$4^{吨H}$-阶损伤修复效应张量，在 ECPL 模型上应用 Voigt 近似（用于说明目的的经纱层中的自修复）。数值 PFA 中确定的失效模式通过内部实验（通过断层法）进行验证。