CAREER: Nested 3-D Micromechanical and Damage Models for Analysis of Pultruded and Laminated Composite Structures

职业：用于分析拉挤和层压复合结构的嵌套 3D 微机械和损伤模型

• 批准号: 9876080
• 负责人: Rami Haj-Ali
• 金额: $ 20万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-04-01 至 2004-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9876080&HistoricalAwards=false
• 关键词: CAREER; Nested; Micromechanical; Damage; Models

A nested three-dimensional (3D) material and structural modeling framework is proposed for nonlinear damage analysis of fiber-reinforced composite structures. Micromechancial and damage models for different composite material systems, such as unidirectional fiber reinforced polymeric (FRP) composites, woven and braided fabrics, can be directly integrated within the components: elastic-degrading continuum damage models for each of the matrix and fiber periodic medium, and a 3D sublaminate model for a repeating ply stacking sequence. The beyond initial failure. The framework is implemented within a displaced-based 3D nonlinear finite-element code. As a result, progressive damage modeling of composite structures is achieved. This approach allows nonlinear anisotropic response, including strain-softening and damaged elastic unloading behavior. Fiber modes of failure are also recognized, including fiber microbuckling. The overall objective of the proposed research is to enhance understanding of the microstructural properties of heterogeneous materials that strongly influence the global damage response of composite structures.

提出了一种用于纤维增强复合材料结构非线性损伤分析的嵌套三维材料和结构建模框架。 不同复合材料系统的微观力学和损伤模型，如单向纤维增强聚合物（FRP）复合材料，编织和编织织物，可以直接集成在组件内：每个矩阵和纤维周期性介质的弹性退化连续损伤模型，和一个重复的铺层堆叠序列的三维子层模型。 超越最初的失败。 该框架内实现了基于位移的三维非线性有限元代码。 从而实现了复合材料结构的渐进损伤建模。 这种方法允许非线性各向异性响应，包括应变软化和损伤弹性卸载行为。 纤维的故障模式也被认可，包括纤维微屈曲。 拟议的研究的总体目标是加强对异质材料的微观结构特性的理解，强烈影响复合材料结构的整体损伤响应。