摘要
本文以-Al2O3Al合金基复合材料为研究对象，在细观层次上建立分析模型，采用三维弹塑性有限元分析方法，对它的拉伸行为进行了较为详细的描述。研究涉及该类复合材料加载初期的应力-应变曲线的模拟和各种微结构特征的变化对应力应变行为的影响。同时考虑了纤维位向变化的影响，并引入了实际测得的短纤维位向分布规律，对随机分布短纤维复合材料的力学行为进行了模拟。研究表明，基体性能、纤维长径比和体积分数、纤维位向以及界面结合对-Al2O3Al合金基复合材料的拉伸行为均有较大的影响；本文所采用的有限元分析方法对该类复合材料加载初期的应力-应变曲线的预测也是较为准确的。
A meso-mechanical analysis model is established for Δ-Al2O3/Al alloy composites and an in-depth study of the tensile behavior of the composite is carried out using three-dimensional elastoplastic finite element method (FEM). The model takes into account the initial stress-strain curve of the composite, the effects of various microstructural parameters on the stress-strain curve and the orientation of fibers. By incorporating the actual distribution of fiber orientation measured in experiments, the initial stress-strain curves of Δ-Al2O3/Al alloy composites are predicted which are in good agreement with experimental results. It is shown that the tensile behavior of the composite is influenced significantly by the matrix properties, aspect ratio and volume fraction of fibers, fiber's orientation and interfacial bond.
出处
《工程力学》
EI
CSCD
北大核心
2000年第5期44-51,共8页
Engineering Mechanics
基金
四川省应用基础基金!(川教科(1998)19)
