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Influence of inclusions on matrix deformation and fracture behavior based on Gurson-Tvergaard-Needleman damage model

机译：基于Gurson-Tvergaard-Candleman损伤模型的基于Gurson-Tvergaard的矩阵变形和断裂行为的含量影响

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摘要

It is well known that the adverse effects of inclusions on the performance of a substrate are not negligible. Currently, as the level of smelting improves, the inclusion content in molten steel has been greatly reduced, but a completely pure material cannot be obtained still. Therefore, it is necessary to study the influence of inclusions on the steel matrix. In this study, the required parameters in the Gurson-Tvergaard-Needleman (GTM) damage model were accurately determined via in-situ tensile tests, and then, the parameters were substituted into the Abaqus model to simulate the tensile forming limit of the strip specimen. The final simulation results were in good agreement with the experimental results. On this basis, the effects of the number and distribution of inclusions on the mechanical properties of matrix materials are further analyzed. In this study, the in-situ tensile test method plays an extremely important role. Specifically, it can reveal the metallographic structure of samples under multiple load nodes during a single tensile experiment, which is conducive to determining parameters f(o) and f(F) of the GTN model and the subsequent research results. The number and rate of pore growth were found to increase with the increasing number of inclusions. Moreover, the probability of pore polymerization increased, leading to damage and fracture of the specimen. Uneven distribution of inclusions resulted in uneven distributions of stress and strain during the deformation process, which changed the fracture behavior of the material. The first failed element appeared in the area with high inclusion content and extended to adjacent areas with high inclusion contents. The strength and plasticity of the material worsen with increasing difference in the distribution of inclusions.
机译：众所周知，夹杂物对基板性能的不利影响是不可忽略的。目前，随着冶炼水平的改善，钢水中的包涵含量大大降低，但仍然无法获得完全纯的材料。因此，有必要研究夹杂物对钢基质的影响。在这项研究中，通过原位拉伸试验精确地确定Gurson-Tvergaard-ConseLeman（GTM）损伤模型所需的参数，然后将参数被取代成ABAQUS模型以模拟条带样品的拉伸形成限制。最终的仿真结果与实验结果很好。在此基础上，进一步分析了夹杂物的数量和分布对基质材料的力学性能的影响。在这项研究中，原位拉伸试验方法起着极其重要的作用。具体地，在单个拉伸实验期间，它可以在多个负载节点下揭示样品的金相结构，这有利于确定GTN模型的参数F（O）和F（F）和随后的研究结果。发现孔隙生长的数量和速率随着含量越来越多的夹杂物而增加。此外，孔隙聚合的概率增加，导致样品的损伤和骨折。夹杂物的不均匀分布导致变形过程中应力和应变的分布不均匀，改变了材料的断裂行为。第一个失败元素出现在具有高包含含量的区域中，并扩展到具有高包涵内容的相邻区域。材料的强度和可塑性随着夹杂物分布的差异而恶化。

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