Elastoplastic Fracture Mechanics Approach to the Crack Growth Rate Computation of Modified Pipe Steels

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
V. D. Makarenko, S. S. Pobeda, Yu. V. Makarenko, S. Yu. Maksymov, V. I. Gots, S. M. Tkachenko, O. V. Vladymyrov, O. M. Horlach, I. V. Zadorozhnykova
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Abstract

A mechanophysical model for crack growth kinetics computation on stress corrosion fracture of modified 06G2BA and 08KhMCHA pipe steels is adequately expressed through the plane stress-strain state /dt and dJ/dt ratios that are dependent on the strain crack tip rate. The crack growth accelerated by an aggressive environment occurs under static and cyclic loading due to transient dissolution and repassivation processes at the crack tip. Such accelerations are divided into three categories, determined by the strain rate: mechanical cracking (fatigue crack and stationary plastic crack), corrosion-accelerated mechanical cracking (corrosion fatigue and corrosion-accelerated plastic crack), and sulfide stress corrosion fracture. Metallographic studies revealed the change in the crack nucleation and propagation mechanisms, from transcrystalline to intercrystalline, related to the viscoplastic and brittle structure of steel specimens cyclically loaded and simultaneously affected by a corrosive environment.

Abstract Image

计算改性钢管裂纹生长率的弹塑性断裂力学方法
改性 06G2BA 和 08KhMCHA 管线钢应力腐蚀断裂的裂纹生长动力学计算的机械物理模型,通过平面应力-应变状态 dα/dt 和 dJ/dt 比值(取决于应变裂纹尖端速率)得到了充分表达。由于裂纹尖端的瞬时溶解和再钝化过程,在静态和循环加载条件下,侵蚀性环境会加速裂纹生长。这种加速分为三类,由应变率决定:机械开裂(疲劳裂纹和静止塑性裂纹)、腐蚀加速机械开裂(腐蚀疲劳和腐蚀加速塑性裂纹)以及硫化物应力腐蚀断裂。金相学研究揭示了裂纹成核和扩展机制的变化,从晶间到晶外,这与循环加载并同时受到腐蚀环境影响的钢试样的粘塑性和脆性结构有关。
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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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