Fracture mechanism and failure criterion of S-07 steel for liquid rocket engine

IF 1.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Multidiscipline Modeling in Materials and Structures Pub Date : 2023-03-01 DOI:10.1108/mmms-11-2022-0257

Yushan Gao, Wei Jiang, S. Huo

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Abstract

PurposeThe fracture mechanism of S-07 steel was investigated by observing the fracture surface of the specimens with scanning electron microscope (SEM). Furthermore, the overall elastic–plastic behaviors and the stress state evolution during the loading procedure of all specimens were simulated by FE analysis to obtain the local strain at crack nucleated location and the average triaxiality of each type of specimen.Design/methodology/approachThree types of tests under various stress states were performed to study the ductile fracture characteristics of S-07 high strength steel in quasi-static condition.FindingsUnder tensile and torsion loading conditions, S-07 steel exhibits two distinctive rupture mechanisms: the growth and internal necking of voids governs the rupture mechanism in tension dominated loading mode, while the change of void shape and internal shearing in the ligaments between voids dominants for shear conditions.Originality/valueThe failure criterion for S-07 steel considering the influence of the triaxial stress state was established.

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液体火箭发动机用S-07钢断裂机理及失效准则

目的利用扫描电镜(SEM)观察S-07钢试样断口形貌，探讨其断裂机理。通过有限元分析，模拟了各试件在加载过程中的整体弹塑性行为和应力状态演化，得到了各试件在裂纹成核位置的局部应变和平均三轴度。设计/方法/方法通过三种不同应力状态下的试验，研究了S-07高强度钢在准静态状态下的韧性断裂特性。结果:在拉伸和扭转加载条件下，S-07钢表现出两种不同的断裂机制:在拉伸主导加载模式下，孔洞的生长和内缩颈主导断裂机制，而在剪切模式下，孔洞形状的变化和孔洞间韧带的内部剪切主导断裂机制。建立了考虑三轴应力状态影响的S-07钢破坏准则。

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