A Micromechanics Study on Short Fiber Reinforced Composites

短纤维增强复合材料的微观力学研究

• 批准号: 04650077
• 负责人: SEKINE Hideki
• 金额: $ 0.45万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 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-04650077/
• 关键词: Composite; Micromechanics; Nonlinear Behavior; Load Carrying Capacity; Microfracture; Computational Simulation; Stress Corrosion; Crack Propagation Rate; 微視破壊; 数値シミュレーション; 酸環境

The micromechanics study on short fiber reinforced composites was made.1. Microfractures and Nonlinear Behaviors of Short Fiber Reinforced CompositesThe damage formation mechanism in short fiber reinforced plastics, metal and ceramics was first considered, and was modeled in order to simulate the fracture behaviors. By means of the computational simulation, the load carrying capacity of short fiber reinforced composites was predicted. The influences of fiberorientation, fiber geometry and fiber-matrix interfacial conditions on the fracture energy were also examined in detail.2. Propagation Rate of a Stress Corrosion Crack in Short Fiber Reinforced SMC CompositesStress corrosion crack tests were carried out on compact tension specimens made from a glass short fiber reinforced SMC composite in acid environment. Then, it was verified that the crack propagation rate da/dt is approximately expressed against the stress intensity factor KAPPA at crack tip in the form da/dt=ALPHA^m where A and m are constans. This relationship was examined from the viewpoint of micromechanics, and the influences of concentration of acid, temperature and fiber volume fraction on the propagation rate were clarified quantitatively. Furthermore, the numerical simulation of the extension behavior of the stress corrosion crack in a glass fiber was performed by using the three-dimensional BEM.

对短纤维增强复合材料进行了细观力学研究。短纤维增强复合材料的微断裂和非线性行为首次考虑了短纤维增强塑料、金属和陶瓷的损伤形成机制，并对其进行了建模以模拟其断裂行为。通过计算模拟，预测了短纤维增强复合材料的承载能力。详细分析了纤维取向、纤维几何形状和纤维-基体界面条件对断裂能的影响。短纤维增强SMC复合材料中应力腐蚀裂纹的扩展速率在酸性环境中，对玻璃纤维增强SMC复合材料制成的紧凑拉伸试件进行了应力腐蚀裂纹试验。证明了裂纹扩展速率da/dt与裂纹尖端的应力强度因子Kappa近似表示为da/dt=α^m，其中A和m为常数。从细观力学的角度分析了这一关系，并定量地阐明了酸浓度、温度和纤维体积分数对传播速率的影响。在此基础上，利用三维边界元对玻璃纤维应力腐蚀裂纹的扩展行为进行了数值模拟。

项目成果

H.Sekine and M.Ogata: "Computational Simulation of Nonlinear Stress-Strain Behavior of Short-Fiber Reinforced Metal Matrix Composites" Proceedings of the 17th Symposium on Composite Meterials. 71-74 (1992)

H.Sekine 和 M.Ogata：“短纤维增强金属基复合材料非线性应力-应变行为的计算模拟”第 17 届复合材料研讨会论文集。

H.Suzuki, H.Sekine and K.Yamada: "Numerical Prediction of the Strength Deterioration of Short Glass Fiber Reinforced Thermoplastics by a Slight Amount of Inorganic Addition Agent" Proceedings of the 71st JSME Spring Annual Meeting. 940-10, Vol.II. 402-404

H.Suzuki、H.Sekine 和 K.Yamada：“少量无机添加剂对短玻璃纤维增​​强热塑性塑料强度劣化的数值预测”第 71 届 JSME 春季年会论文集。

H.Suzuki: "Tension-Softening Relation and Fracture Energy of Short-Fiber Reinforced Composites" Proceedings of the Sixth Japan-U.S. Conference on Composite Materials. 825-833 (1993)

H.Suzuki：“短纤维增强复合材料的张力软化关系和断裂能”第六届日美复合材料会议论文集。

H.Suzuki and H.Sekine: "Tension-Softening Relation for Short-Fiber-Reinforced Composites and its Application" Proceedings of the 70th JSME Fall Annual Meeting. 920-78, Vol.B. 213-215 (1992)

H.Suzuki 和 H.Sekine：“短纤维增强复合材料的张力软化关系及其应用”第 70 届 JSME 秋季年会论文集。

関根 英樹: "短繊維強化金属基複合材料の非線形応力-ひずみ挙動のコンピュータ・シミュレーション" 日本複合材料学会 第17回複合材料シンポジウム講演要旨集. 71-74 (1992)

Hideki Sekine：“短纤维增强金属基复合材料非线性应力应变行为的计算机模拟”日本复合材料学会第十七届复合材料研讨会摘要71-74（1992）。