Application of continuum damage mechanics in fatigue assessment of A516 steel specimens considering residual stresses

IF 4 2区工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Damage Mechanics Pub Date : 2023-06-24 DOI:10.1177/10567895231183465

M. Attarha, I. Sattari-far, I. Sattarifar

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Abstract

The present study evaluates the effects of tensile residual stresses on fatigue behaviour of ASTM A516 pressure vessel steel specimens. In this regard, fatigue specimens containing a smooth notch region are studied. A damage coupled elastic-plastic constitutive material model is developed to investigate effects of residual stresses on fatigue life. Isotropic and kinematic hardening parameters of the material are experimentally determined. Additionally, the damage model parameters are specified from fatigue experiments conducted on standard specimens in different stress ratios. Tensile residual stresses are introduced into the smooth notched specimens through employing four-point-bending method. The hole drilling technique is utilized to measure the residual stress magnitudes. The results indicate that about two third of fatigue life of the specimens is decreased due to the existed tensile residual stresses. Furthermore, fatigue crack initiation and propagation behaviour in the specimens containing residual stress are studied based on the developed continuum damage model.

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连续损伤力学在考虑残余应力的A516钢疲劳评定中的应用

本研究评估了拉伸残余应力对ASTM A516压力容器钢试样疲劳性能的影响。在这方面，研究了包含光滑缺口区域的疲劳试样。建立了损伤耦合弹塑性材料本构模型，研究残余应力对疲劳寿命的影响。通过实验确定了材料的各向同性和运动硬化参数。此外，损伤模型参数是根据在不同应力比下对标准试样进行的疲劳实验确定的。采用四点弯曲法将拉伸残余应力引入光滑缺口试件中。钻孔技术用于测量残余应力大小。结果表明，由于存在拉残余应力，试样的疲劳寿命降低了约三分之二。此外，基于所建立的连续损伤模型，研究了含残余应力试件的疲劳裂纹萌生和扩展行为。

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来源期刊

International Journal of Damage Mechanics 工程技术-材料科学：综合

CiteScore

8.70

自引率

26.20%

发文量

审稿时长

5.4 months

期刊介绍： Featuring original, peer-reviewed papers by leading specialists from around the world, the International Journal of Damage Mechanics covers new developments in the science and engineering of fracture and damage mechanics. Devoted to the prompt publication of original papers reporting the results of experimental or theoretical work on any aspect of research in the mechanics of fracture and damage assessment, the journal provides an effective mechanism to disseminate information not only within the research community but also between the reseach laboratory and industrial design department. The journal also promotes and contributes to development of the concept of damage mechanics. This journal is a member of the Committee on Publication Ethics (COPE).