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: 9800128
• 负责人: Linda Schadler
• 金额: $ 15.7万
• 依托单位: Rensselaer Polytechnic Institute
• 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 2002-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9800128&HistoricalAwards=false
• 关键词: Creep; Fracture; Graphite; Polymer; Composites

CMS 9800128 PI: L.S. Schadler RPI 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. ***

CMS 9800128 PI：L.S。 Schadler RPI摘要在单向，石墨纤维/聚合物 - 矩阵复合材料中的蠕变骨折的合并实验研究和理论研究进行了张力。蠕变断裂在各种应用中都很重要，例如丝状伤口压力容器，皮杆和梁，近海平台稳定电缆和管道，所有这些都长时间持续了高负荷。 该模型在复合材料中结合了微力机械和统计失败过程，并产生了强度和长期寿命的概率分布。微拉曼光谱法（MRS）用于研究基质蠕变和时间依赖性的界面剥离，并在长度尺度上更接近纤维直径。 开发了该复合材料的快速合作微力学模型，该模型为大型纤维断裂和断裂簇提供了应力和位移场，用于大型蒙特卡洛模拟。 MRS实验和计算模型在随着时间的流逝而变化时进行了交互式解释实验应力曲线。 ***