Investigation of the applicability and effectiveness of unified constraint parameters on A516 Gr70 steel specimens under ductile fracture

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2024-07-18 DOI:10.1016/j.ijpvp.2024.105264

Zeng Chen , Rob Kulka , Harry Coules , Mahmoud Mostafavi

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Abstract

In our previous study, a unified parameter λ based on crack-tip plastic strain energy was proposed which using BS1501-224 28B steel specimens at a low temperature showed promise to quantify both in-plane and out-of-plane constraints concurrently. In this study, a large number of A516 Gr70 steel specimens with wide-ranging changes in thicknesses and crack lengths were tested at the materials’ upper shelf (−15^oC) to further validate the applicability of λ. A series of numerical models were conducted based on the experimental data and the applicability and effectiveness of parameter λ were studied. A comparison between parameter λ and another unified constraint parameter A_p was discussed to justify using this new method. It is found that parameter λ can be used for specimens with large plasticity and it performs better than parameter A_p. What is more, an application method of using parameter λ to predict the fracture toughness of nonstandard specimens was proposed which sets out a method to incorporate it into engineering assessments.

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韧性断裂条件下统一约束参数在 A516 Gr70 钢试样上的适用性和有效性研究

我们在之前的研究中提出了基于裂纹尖端塑性应变能的统一参数 λ，该参数在低温下使用 BS1501-224 28B 钢试样，显示出同时量化面内和面外约束的前景。在本研究中，大量厚度和裂纹长度变化范围较大的 A516 Gr70 钢试样在材料上层（-15oC）进行了测试，以进一步验证 λ 的适用性。根据实验数据建立了一系列数值模型，研究了参数 λ 的适用性和有效性。讨论了参数 λ 和另一个统一约束参数 Ap 之间的比较，以证明使用这种新方法的合理性。结果发现，参数 λ 可用于塑性较大的试样，且性能优于参数 Ap。此外，还提出了使用参数 λ 预测非标准试样断裂韧性的应用方法，为将其纳入工程评估提供了方法。

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.