Residual Stress Effect on Limiting Cycle Amplitudes in Welded Joints

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Strength of Materials Pub Date : 2024-09-17 DOI:10.1007/s11223-024-00669-x
V. O. Degtyarev
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Abstract

The paper proposes a method for determining diagrams of the limiting cycle amplitudes of welded joints with steady-state residual tensile stresses based on the test results of small-sized specimens and presents the corresponding calculation dependencies. This technique is an express method for estimating the fatigue resistance characteristics of welded joints if full-scale tests are not feasible. The analysis of literature data for various types of welded joints shows a good fit of the experimental and calculated values of the endurance limits of welded joints of low-carbon steels with low-alloy, low-strength steels. It is shown that the inclined section of the diagram with steady-state residual stresses is shifted in parallel relative to the diagram of cycle amplitudes of welded specimens without residual stresses. It has been established that the diagrams of the limiting cycle amplitudes of welded joints with different values of the steady-state residual stresses end on a line where each point at different average cycle stresses corresponds to the minimum limiting cycle amplitude of the welded joint with its particular value of the ultimate steady-state residual stress, which ensures the realization of the ultimate stress cycle. With the same value of the steady-state residual stress, the endurance limit of welded joints decreases with an increase in the yield strength. It is shown that low values of steady- state residual stresses result in nearly the same endurance limit reduction of butt welded joints of steels of different strengths. In contrast, their higher values aggravate the endurance limit deterioration of steels with higher mechanical characteristics.

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残余应力对焊接接头极限循环振幅的影响
本文提出了一种根据小尺寸试样的试验结果确定具有稳态残余拉应力的焊接接头极限循环振幅图的方法,并给出了相应的计算依赖关系。在无法进行全尺寸试验的情况下,该技术是估算焊接接头抗疲劳特性的一种有效方法。对各种类型焊接接头的文献数据分析显示,低碳钢与低合金、低强度钢焊接接头耐久极限的实验值和计算值非常吻合。结果表明,与无残余应力的焊接试样周期振幅图相比,稳态残余应力图的倾斜部分平行移动。已经确定,具有不同稳态残余应力值的焊接接头的极限循环振幅图在一条直线上结束,在这条直线上,不同平均循环应力下的每个点都对应于具有特定极限稳态残余应力值的焊接接头的最小极限循环振幅,这确保了极限应力循环的实现。在稳态残余应力值相同的情况下,随着屈服强度的增加,焊接接头的耐久极限会降低。研究表明,稳态残余应力值较低时,不同强度钢材的对接焊点的耐久极限降低幅度几乎相同。相反,残余应力值越高,机械特性越高的钢材的耐久极限越差。
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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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