Based on the heterogeneous material model, an integrated analysis method was introduced to predict the service life of propeller. The morphology and distribution characteristic of non-continuous defects (porosity & inclusion) were calculated and mapped into the finite element model by 3D-mapping algorithm, and the fatigue life was predicted based on the heterogeneous material model. In this paper, the coupling analysis of casting process and fatigue prediction of marine propeller was done. The results show that porosity and mass inclusions in blade roots of propeller form serious heterogeneous characteristics in those parts, which increased the maximum stress of the propeller and decreased its theoretical fatigue life by 1/2, indicating that the effect of non-continuous defects on the service performance of casting is notable and cannot be ignored. Based on the integrated analysis method, the inference of the pouring temperature and gating system on the service life of propeller was studied further. The integrated analysis method brings the influence of the casting defects into structural analysis and fatigue analysis, which can improve the accuracy of the fatigue life prediction significantly.

在异质材料模型的基础上，引入了一种综合分析方法来预测螺旋桨的使用寿命。计算非连续缺陷的形态和分布特征（孔隙和夹杂物），并通过3D映射算法映射到有限元模型中，并基于异质材料模型预测疲劳寿命。本文对船用螺旋桨的铸造过程与疲劳预测进行了耦合分析。结果表明，螺旋桨叶片根部的孔隙和质量夹杂物在这些部分形成了严重的异质性，从而增加了螺旋桨的最大应力，并使理论疲劳寿命降低了1/2，表明非连续缺陷对铸件服务性能的影响是显着的，不能忽略。基于综合分析方法，进一步研究了浇注温度和浇口系统对螺旋桨使用寿命的推论。综合分析方法将铸件缺陷的影响引入结构分析和疲劳分析，可以显着提高疲劳寿命预测的准确性。