界面应力传递重新分析及Cohesive模型参数的确定

发布时间：2018-04-25 14:53

本文选题：剪滞理论 + cohesive模型　；参考：《材料科学与工程学报》2017年06期

【摘要】：在经典剪滞理论中引入双线性cohesive模型表征纤维/基体之间的非理想界面,重新分析了纤维增强复合材料中的应力传递机理,得到了考虑界面因素的应力分布。用上述结果解释了单丝段裂实验过程中的现象,讨论了界面参数和材料性能对应力分布的影响。基于上述理论,建立了用cohesive单元表征界面的模拟单丝段裂实验的三维有限元模型,结合单丝段裂实验结果,提出了一种估测cohesive界面刚度参数的新方法。数值和理论分析结果与实验结果对比,吻合良好,可以为材料的界面性能分析和材料设计提供参考依据。
[Abstract]:A bilinear cohesive model is introduced to characterize the non-ideal interface between fiber and matrix in classical shear lag theory. The stress transfer mechanism in fiber reinforced composites is reanalyzed and the stress distribution considering interface factors is obtained. The effects of interface parameters and material properties on the stress distribution are discussed. Based on the above theory, a three-dimensional finite element model for simulating monofilament splitting experiments using cohesive element is established. A new method for estimating the stiffness parameters of monofilament interface is proposed based on the results of monofilament splitting experiments. The results of numerical and theoretical analysis are in good agreement with the experimental results, which can provide a reference for the analysis of interfacial properties and the design of materials.
【作者单位】：天津大学机械工程学院力学系;
【基金】：国家自然科学基金资助项目(10972155,11572218,81670884)
【分类号】：TB33

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