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随着内聚力模型的应用越来越广泛,获得材料内聚力区参数成为了材料断裂行为研究的一个重要内容。本文提出了一种实验测量与数值模拟相结合的材料内聚力区参数反解方法。该方法首先利用数字图像相关方法测量试件裂纹尖端的内聚力区分离量,然后利用数值辅助场以及交互J积分与路径无关的性质反解内聚力区牵引力。本文利用数值实验验证了这一方法的有效性,并对反解过程中积分路径、网格密度等因素对求解结果的影响进行了讨论。最后,利用本方法求取了20%体积含量随机云杉短纤维增强聚丙烯复合材料(云杉/PP复合材料)的内聚力区参数。
As cohesion models become more and more widely used, obtaining the cohesion zone parameters has become an important part of the research on the fracture behavior of materials. In this paper, a method of inverse solution of material cohesion zone parameters is proposed, which is a combination of experimental measurement and numerical simulation. In this method, the cohesion separation of crack tip is measured by digital image correlation method. Then the tractive force of the cohesion zone is inversely reconstructed by using numerical aids and interaction J-integral, which has nothing to do with the path. In this paper, the numerical experiments are used to verify the effectiveness of this method. The effects of integral path, grid density and other factors on the solution are discussed. Finally, the cohesion zone parameters of random spruce short fiber reinforced polypropylene composites (spruce / PP composites) were determined using this method.