Microscopic deformation mechanism and its application to the evaluation of macroscopic deformation behavior of fiber reinforced composite materials

微观变形机制及其在纤维增强复合材料宏观变形行为评价中的应用

基本信息

批准号：
04452123
负责人：
TOMITA Yoshihiro
金额：
$ 4.03万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

The deformation and fracturing behaviors of composite materials which are extensively employed as the advanced materials in the field of technology are substantially different from those of conventional materials. The main mechanism of deformation and fracturing behaviors is deeply related to the existence of the interface between the different materials. Consequently, it is very important to clarify the deformation mechanisms near the interface and to develop the evaluation procedure of the strength of the composite materials based on microscopical response of the materials. In this project, following points are intensively investigated.1. In order to clarify the deformation and fracturing machanisms of the composite materials, a unit consist of a fiber and matrix is extracted from the composite material and precise deformation behaviors under different stress system is fully investigated by means of finite element method.2. The effect of size and shape of the reinforcement on the def … More ormation behavior has been clarified. The very peculiar deformatin behaviors are observed under dynamic loading, which are deeply related to the material characteristics, shape, size and deformation rate applied.3. By means of universal testing machine for light load, the comprehensive experiments have been done for the component materials of composite. The obtained data is emloyed to the establishment of the constitutive equation suitable for the introduction of the above mentioned investigation. The strain rate and temperature sensitivities, and the strain rate history dependent flow stress are accomodated in the constitutive equation.4. The non-local continuum model which describes the global deformation and fracturing behaviors of the composite materials has been developed by acounting for the interaction of the unit composites. The appropriateness of the proposed model has been checked by the numerical simulation.5. By the present investigation, the dynamic deformation behavior is concerned, it has been clarified that the construction of the composite materials consist of sufficiently large number of unit composite is very difficult because of the absolute time dependence of deformation behavior. The direct simulation of the composite materials should be required.The part of the results obtained have been published as original papers and contributed papers shown in the next page. Less

复合材料的变形和破裂行为被广泛用作技术领域的高级材料与常规材料的变形和破裂行为大不相同。变形和破裂行为的主要机制与不同材料之间界面的存在密切相关。因此，阐明界面附近的变形机制并根据材料的显微镜响应制定复合材料强度的评估程序非常重要。在这个项目中，对以下几点进行了深入研究。1。为了阐明复合材料的变形和压裂马切斯主义，通过有限元方法对不同应力系统的复合材料中提取了由纤维和基质组成的单位，并从不同的应力系统下提取精确的变形行为。2。加固的大小和形状对DEF的影响……详细阐明了更多的Ormation行为。在动态载荷下观察到非常特殊的变形行为，这些行为与应用的材料特征，形状，大小和变形速率密切相关。3。通过通用测试机的光负载，已经为复合材料的组件材料进行了全面的实验。获得的数据与适合引入上述投资的宪法对等建立有关。应变速率和温度灵敏度以及应变率病史依赖性流动应力在本构方程中接受。4。描述复合材料的全局变形和破裂行为的非本地持续模型是通过考虑单位组成的相互作用而开发的。已通过数值模拟检查了所提出模型的适当性。5。通过本研究，涉及动态变形行为，已经澄清的是，复合材料的构建由足够大量的单位复合材料组成非常困难，因为变形行为的绝对时间依赖性。应需要对复合材料进行直接模拟。所获得的结果的部分已作为原始论文发表，并在下一页显示的论文。较少的