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

• 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
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452123/
• 关键词: Fiber reinforced materials; Deformation behavior of interface; Dynamic deformation behavior; Nonlocal deformation behavior; Strength estimation; Consistutive equation; Simulation; Microscopic deformation; 変形の局所化; 陽解法

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

复合材料作为先进材料在技术领域得到广泛应用，其变形和断裂行为与传统材料有很大不同。变形和断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开发基于材料微观响应的复合材料强度评估程序非常重要。本项目重点研究了以下几点： 1．为了阐明复合材料的变形和断裂机理，从复合材料中提取出由纤维和基体组成的单元，并利用有限元方法充分研究了不同应力体系下的精确变形行为。 2．增强材料的尺寸和形状对变形行为的影响已得到阐明。在动载荷作用下观察到非常奇特的变形行为，这与所施加的材料特性、形状、尺寸和变形率密切相关。 3．借助轻载万能试验机，对复合材料的组成材料进行了综合试验。所获得的数据用于建立适合引入上述研究的本构方程。应变率和温度敏感性以及应变率历史相关的流动应力都包含在本构方程中。4．通过考虑单元复合材料的相互作用，开发了描述复合材料整体变形和断裂行为的非局部连续模型。通过数值模拟验证了所提出模型的正确性。 5．通过目前的研究，就动态变形行为而言，已经阐明，由于变形行为的绝对时间依赖性，由足够多的单元复合材料组成的复合材料的构造是非常困难的。应要求对复合材料进行直接模拟。所获得的部分结果已作为原始论文和贡献论文发表，如下页所示。较少的

项目成果

Masashi Inoue Yoshihiro Tomita: "A constitutive equaton for deformation behavior of polymers with transition from crystalline to amorphous states and its application" Proc.JSME. 930-71. 541-542 (1993)

Masashi Inoue Yoshihiro Tomita：“从晶态到非晶态转变的聚合物变形行为的本构方程及其应用”Proc.JSME。

Taiji Adachi Yoshihiro Tomita Masao Tanaka Shuuji Era: "Finite element method of elastic Cosserat continuum and its application to deformation behavior of materials with microstracture" Trans.JSME. 60-569. (1994)

Taiji Adachi Yoshihiro Tomita Masao Tanaka Shuuji Era：“弹性 Cosserat 连续体的有限元方法及其在微结构材料变形行为中的应用”Trans.JSME。

高馬 裕二: "衝撃変形を受ける弾粘塑性複合材の変形挙動のシミュレーション" 日本機械学会関西支部第68期定時総会講演会. (1993)

Yuji Takama：“模拟弹粘塑性复合材料受到冲击变形的变形行为”在日本机械工程学会关西分会第 68 届年度大会上的演讲（1993 年）。

Yoshihiro Tomita: "Computational Approaches to Plastic Instabilities in Solid Mechanics" Theoretical and Applied Mechanics,IUTAM.81-98 (1993)

Yoshihiro Tomita：“固体力学中塑性不稳定性的计算方法”理论与应用力学，IUTAM.81-98 (1993)

三村耕司: "異方性降伏関数による繰り返し変形時のひずみ硬化の検討" 日本機械学会材料力学部門講演会論文集. 930-71. 323-324 (1993)

Koji Mimura：“使用各向异性屈服函数进行重复变形过程中的应变硬化研究”，日本机械工程师学会材料力学分会论文集 930-71 (1993)。