Evaluating critical SZW and its variation using curved CT specimens used in pressure tubes material testing of nuclear reactor

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2025-01-25 DOI:10.1016/j.ijpvp.2025.105446

Sanjeev Saxena , Badal M. Pandharkar , Rahul Singh Sikarwar

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引用次数: 0

Abstract

In case of small thin pipes (R/t ≥ 10), such as pressure tubes in nuclear reactor, it is not possible to get flat standard fracture specimens. In such evaluation of initial fracture toughness and critical stretch zone width (SZWc) of the material, the effect of pre-strain which is included during straightening of the strip, the effect of curvature and the effect of using sub-size fracture specimen is not taken into account. Therefore, it is important to compare the SZWc variation and initiation fracture toughness evaluated using flat and curved fracture specimens.

In the present study, the effect of geometrical parameters of curved compact tension (CT) specimen (such as width, crack front direction, relative crack size and radius to thickness ratio) on the SZWc is studied. Using curved CT specimen, a measuring range (average of:1/8 to 3/8 times the specimen thickness towards concave side) is also suggested for the evaluation of SZWc, that will provide SZWc value evaluated using flat CT specimen.

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利用核反应堆压力管材料试验中弯曲CT试样评估临界SZW及其变化

对于小细管（R/t≥10），如核反应堆压力管，不可能得到扁平的标准断裂试样。在评估材料的初始断裂韧性和临界拉伸区宽度（SZWc）时，没有考虑带材矫直过程中包含的预应变的影响、曲率的影响以及使用亚尺寸断裂试样的影响。因此，比较用平面和弯曲断裂试样评估的SZWc变化和起裂韧性是很重要的。在本研究中，研究了弯曲致密拉伸（CT）试样的几何参数（如宽度、裂纹前沿方向、相对裂纹尺寸和半径厚度比）对SZWc的影响。采用弯曲的CT试样，对SZWc的评价也建议了一个测量范围（平均为：1/8 ~ 3/8倍试样向凹侧厚度），从而得到使用平面CT试样评价的SZWc值。

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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.