Development of failure mode related degradation models for carbon fibre reinforced textile com-posites with non-crimped threads

开发具有非卷曲线的碳纤维增强纺织复合材料的失效模式相关退化模型

基本信息

批准号：
171396308
负责人：
Professor Dr.-Ing. Maik Gude
金额：
--
依托单位：
Institut für Leichtbau und Kunststofftechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/171396308?language=en
关键词：
Development failure mode related degradation

项目摘要

For the application of textile-reinforced composites in safety-relevant structural components, reli-able predictions about their failure and damage behaviour are required. Therefore, degradation models exemplarily for 3D-reinforced carbon fibre textile composites with non-crimped threads have been developed and for the first time verified with in situ computed tomography in the first period of the project. The second phase of funding aims at the extension of the models that were developed for quasi-static monotonic loading by considering the influence of the loading history and multiaxial loading conditions on the material degradation. In particular, the investigations will focus on quasi-static uniaxial reverse loads (tension - compression), multiaxial loading with se-quential and simultaneous load application (tension/compression-torsion) and loading with load direction change (in-plane - out-of-plane). By means of in situ computed tomography, the major objective is to gain an improved insight into crack closure and crack opening effects, load redistri-bution processes and damage interactions in textile composites. In contrast to other diagnostic methods like conventional computed tomography, ultrasonic or micrograph analyses, the in situ computed tomography enables the classification of such processes directly during loading.The existing in situ CT device has to be improved by different constructive measures in order to increase the resolution of the CT scans from 25 to 5 microns together with a reduction of the scan-ning duration of 15 minutes. Furthermore, an already procured test complex shall be used for in situ CT analysis of textile-reinforced composites under multiaxial loading conditions for the first time. The influence of the loading history on the damage behaviour of the composites and thus on the stiffness degradation shall be considered within the scope of model extensions. This implies that modified approaches based on the classified damage phenomenology have to be developed which describe the passive damage evolution, the coupled damage growth under multiaxial loading and the delamination propagation. The advanced models then provide the basis for an improved design of textile-reinforced composite structures under complex loading conditions.

为了在安全相关的结构组件中应用纺织品增强的复合材料，需要对其失败和损害行为的可靠预测。因此，已经开发了针对具有非裂纹线的3D增强碳纤维纺织品复合材料的降解模型，并且首次在项目的第一阶段对原位计算机断层扫描进行了验证。资金的第二阶段旨在通过考虑加载历史记录和多轴加载条件对材料降解的影响，旨在扩展用于准静态单调载荷的模型。特别是，研究将集中于准静态单轴反向载荷（张力 - 压缩），带有sequent和同时负载施用（张力/压缩 - 变量）的多轴负载（张力/压缩 - 变量）以及负载方向变化（平面外部平面外）。通过原位计算机断层扫描，主要目的是改善对裂纹闭合和裂纹效果的洞察力，负载重新分配过程以及纺织复合材料中的损害相互作用。与其他诊断方法（如传统计算机断层扫描，超声波或显微照片分析）相反，原位计算机断层扫描能够直接在加载过程中对此类过程进行分类。必须通过不同的构造措施来改进现有的CT设备，以便将CT扫描的分辨率从25微米的分辨率增加到5微米，并从25微米增加到15分钟15分钟。此外，首次在多轴载荷条件下，应将已经采购的测试复合物用于对纺织 - 增强复合材料的原位分析。在模型扩展的范围内，应考虑加载历史对复合材料损伤行为以及刚度降解的影响。这意味着必须开发基于分类损伤现象学的修改方法，以描述被动损伤演变，多轴负载下的耦合损伤生长以及分层传播。然后，高级模型为在复杂的加载条件下改善了纺织品增强复合结构的设计提供了基础。