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

石墨/聚合物复合材料的蠕变断裂：预测寿命的实验和建模

• 批准号: 9818374
• 负责人: Maher Amer
• 金额: $ 2.3万
• 依托单位: Wright State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-15 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9818374&HistoricalAwards=false
• 关键词: Creep; Fracture; Graphite; Polymer; Composites

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.

对单向石墨纤维/聚合物基复合材料拉伸蠕变断裂进行了实验和理论研究。蠕变断裂在纤维缠绕压力容器、挤压杆和梁、海洋平台稳定电缆和管道等长期承受高载荷的各种应用中都是重要的。该模型考虑了复合材料的细观力学和统计失效过程，并给出了强度和长期寿命的概率分布。显微拉曼光谱(MRS)被用来研究纤维直径附近长度尺度上的基质蠕变以及随时间变化的界面脱粘和滑移现象。建立了复合材料的快速交换细观力学模型，该模型提供了用于大型蒙特卡罗模拟的纤维断裂和断裂团簇的随机排列的应力场和位移场。MRS实验和计算模型被交互地用于解释实验应力分布随时间的变化。