Creep Fracture of Graphite/Polymer Composites: Experiments and Modeling to Predict Lifetime (with RPI)

石墨/聚合物复合材料的蠕变断裂：预测寿命的实验和建模（使用 RPI）

• 批准号: 9800413
• 负责人: Stuart Phoenix
• 金额: --
• 依托单位: Cornell 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: 1998-05-01 至 2001-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9800413&HistoricalAwards=false
• 关键词: Creep; Fracture; Graphite; Polymer; Composites

CMS 9800413 PI: S.L. Phoenix Cornell University ABSTRACT A combined 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, pultruded 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. ***

摘要对单向石墨纤维/聚合物基复合材料的拉伸蠕变断裂进行了实验与理论相结合的研究。蠕变断裂在各种应用中都很重要，例如长丝缠绕压力容器、拉挤杆和梁、海上平台稳定电缆和管道，这些都需要长时间承受高载荷。该模型结合了复合材料的微观力学和统计失效过程，并给出了强度和长期寿命的概率分布。微拉曼光谱（MRS）用于研究接近纤维直径长度尺度的基体蠕变和随时间变化的界面剥离和滑移现象。建立了复合材料的快速计算细观力学模型，该模型提供了用于大型蒙特卡罗模拟的大型随机纤维断裂和断裂簇阵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随时间变化的实验应力剖面。＊＊＊