本文在球铁三点弯曲试件的裂纹尖端区模拟球铁材料的微观结构,建立了宏观与微观相结合的局部复相离散计算模型和复相材料中J积分基本关系式,编制了适合计算多相材料弹塑性大应变及J积分的有限元程序,对石墨形状、大小及体积百分比等对球铁应力强度因子及断裂韧性的影响作了比较全面的分析,和相应实验结果符合得较好。
A model with local composite structure is used to simulate the microstructure of nodular cast iron at a small crack tip region of the three-point bending specimen This model allows to get a solution close enough approaching the solution of a real material The J-integral in a material with composite structure is discussed It is found that the fracture toughness of nodular cast iron is practically the fracture toughness of steel with holes The effects of the graphite shape, size, volume fraction etc. on the stress intensity factor and fracture toughness of nodular cast iron are also examined. In the finite element calculation, the elastoplastic increment theory with finite deformation has been used The calculated results agree well with experimental data
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