Short-term dynamic stress-strain behavior of textile high-performance materials

纺织高性能材料的短期动态应力应变行为

基本信息

批准号：
269480495
负责人：
Professor Dr.-Ing. Chokri Cherif
金额：
--
依托单位：
Institut für Textilmaschinen und Textile Hochleistungswerkstofftechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/269480495?language=en
关键词：
Short term dynamic stress strain

项目摘要

In the context of an expansion of applications of fiber-based materials and technical textiles in heavy duty fields, the question of mechanical properties of fiber materials under fast-acting strains is gradually gaining center stage. Such strains are common in ballistic protection textiles, but also occur in composite materials with fiber reinforcements (fiber-reinforced plastic composites, textile concrete) exposed to impact strains. The existing tensile strength characteristics for pure high-performance fiber materials, particularly fiberglass (GF), carbon fiber (CF), and aramid (AR) filament yarns, refer largely to the behavior under static and quasistatic load, as no reliable test benches and methods designed to meet the special requirements of such samples under high strain velocities are available for tests under short-term dynamic strain. The aim of the project is the development of a testing method for expansion rate-dependent filament yarn strengths and stiffnesses of impregnated and non-impregnated high-performance filament yarns in the fiber longitudinal direction, especially GF, CF, and AR filament yarns, in a reliable and reproducible manner. A testing methodology conceived at ITM, using an existing drop test rig, is developed further with the requirements of textile high-performance filament yarns and the correspondingly higher testing speeds and expansion rates of up to 100 s-1 in mind. Building on the findings, a special test station for the analysis of the further expansion rate range to 1000 s-1 is developed, based on a rotary drive and customized to these special requirements and including the further development and integration of force and distance measurement technology.Additionally, the groundwork is to be laid for an analytical description of the expansion rate-dependent mechanical material properties of the high-performance filament yarns under tensile strain, based on a Weibull strength distribution. Additionally, the expansion rate-dependent material parameters tensile strength, stiffness and energy absorption capability are determined systematically and described by analytical constitutive equations. These regularities are a substantial basis for the modeling of the local and global mechanical behavior of textile high-performance materials at short-term dynamic impact strains, particularly for the failure case essential in component design, in order to create the decisive prerequisites for well-founded, impact-oriented developments, modelings and simulations of highly resilient high-performance fiber materials and structures and the consequent application possibilities.

在纤维基材料和技术纺织品在重型领域中的应用扩展的背景下，快速作用菌株下纤维材料的机械性能问题逐渐成为中心阶段。这种菌株在弹道保护纺织品中很常见，但也出现在带有纤维增强材料（纤维增强的塑料复合材料，纺织品混凝土）的复合材料中。纯高性能纤维材料的现有拉伸强度特性，尤其是玻璃纤维（GF），碳纤维（CF）和Aramid（AR）细丝纱，在很大程度上是指静态和准遗传负载下的行为，因为没有可靠的测试台和方法旨在满足在高应变下的特殊要求，即可在高应变下进行高应变veLocities的特殊要求。该项目的目的是开发一种测试方法，以依赖速率的细丝纱线和浸渍和未浸渍的高性能细丝沿纤维纵向方向，尤其是GF，CF，CF和AR细丝Yarns，以可靠且可抛光的方式。使用现有的Drop Test钻机构想的ITM的测试方法是在纺织高性能细丝纱线以及相应较高的测试速度和高达100 S-1的扩展速度的要求中进一步开发的。基于调查结果，开发了一个特殊的测试站，用于分析进一步的膨胀速率范围为1000 S-1，并根据旋转驱动器并根据这些特殊要求进行定制，包括对力和距离测量技术的进一步开发和整合。基于基础，基于基于扩展速率的分析属性的分析属性，基于高度较高的材料的分析率，以较高的分配属性，以较高的分配属性。此外，依赖速率的材料参数是系统地确定的，并通过分析组成方程来确定刚度和能量吸收能力。这些规律性是在短期动态影响菌株下对纺织高性能材料的局部和全球机械行为进行建模的重要基础，尤其是对于组件设计必不可少的故障情况，以创建基于结构良好的，影响型，面向影响力的开发，高度强度高强度的材料和结构和结构材料和结构和结构和结构和结构的决定性的决定性先决条件。