Creep Fracture of Graphite/Polymer Composites: Experiments and Modeling to Predict Lifetime

对单向石墨纤维/聚合物基复合材料拉伸蠕变断裂进行了联合收割机的实验和理论研究。蠕变断裂在各种应用中是重要的，例如纤维缠绕压力容器、挤压杆和梁、海上平台稳定电缆和管道，所有这些都长时间承受高载荷。该模型结合了复合材料的微观力学和统计失效过程，并产生强度和长期寿命的概率分布。显微拉曼光谱（MRS）是用来研究基体蠕变和时间依赖性的界面脱粘和滑移现象的长度尺度接近纤维直径。建立了复合材料的快速计算细观力学模型，为大型Monte Carlo模拟提供了纤维断裂和断裂簇的应力场和位移场。MRS实验和计算模型交互地用于解释实验应力分布，因为它们随着时间的推移而变化。

A combine experimental and theoretical study of the creep fracture in unidirectional, graphite fiber/polymer-matrix composite materials in tension is conducted. Creep fracture is important in various applications such as filament wound pressure vessels, putruded rods and beams, offshore platform stabilizing cables and pipes, all of which sustain high loads for long times. The model incorporates micromechanical and statistical failure processes in the composite, and yields probability distributions for strength and long-term lifetime. Micro-Raman Spectroscopy (MRS) is used to study matrix creep and time-dependent interfacial debond and slip phenomena at length scales closer to fiber diameter. Fast comutational micromechanics model for the composite is developed that provides stress and displacement fields for large random arrays of fiber breaks and break clusters for use in large Monte Carlo simulations. The MRS experiments and computational model are interactively used to interpret experimental stress profiles as they change over time.