This paper concerns numerical modelling of the deformation process, taking into account the local fracture of porous 316L sinters at the mesoscopic scale using the finite element method. Calculations are performed with the use of geometrical models, to map the realistic shape of the porous mesostructure of the material, obtained by means of computed microtomography. The microtomographic device has limited and insufficient measurement accuracy for materials such as the porous sinters studied. For this reason, a method to compensate the inaccuracy of mesostructure shape-mapping is used in the numerical modelling of the deformation and fracture process of the material. The normalised Cockroft-Latham ductile fracture criterion is used to model the local fracture process (at the mesostructure level) of porous metal sinters under tension. The paper describes the numerical modelling procedure and the results of the calculations. The influence of the material structure on the meso-scale fracture process is also discussed. The numerical nominal stress–strain curves are compared with the results of experimental testing. The analysis of stress and strain fields and their variability caused by local fracture in the investigated heterogeneous material is also carried out.

本文涉及变形过程的数值模拟，考虑到多孔 316L 烧结体在细观尺度上使用有限元方法的局部断裂。使用几何模型进行计算，以绘制通过计算机显微断层扫描获得的材料多孔细观结构的真实形状。显微断层扫描设备对于所研究的多孔烧结体等材料的测量精度有限且不足。为此，在材料变形和断裂过程的数值建模中使用了一种补偿细观结构形状映射不准确性的方法。归一化的 Cockroft-Latham 延性断裂准则用于模拟多孔金属烧结体在张力下的局部断裂过程（在细观结构水平）。本文描述了数值建模程序和计算结果。材料结构对材料的影响还讨论了细观尺度断裂过程。将数值标称应力-应变曲线与实验测试结果进行比较。还对所研究的异质材料中的局部断裂引起的应力和应变场及其可变性进行了分析。