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首页> 外文期刊>Journal of the Aeronautical Society of India >FATIGUE CRACK GROWTH AND FRACTURE BEHAVIOUR OF CARBON STEEL ELBOWS
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FATIGUE CRACK GROWTH AND FRACTURE BEHAVIOUR OF CARBON STEEL ELBOWS

机译：碳钢弯头的疲劳裂纹扩展和断裂行为

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摘要

Experimental and analytical investigation were carried out to demonstrate the Leak-Before-Break (LBB) concept design criteria for the high energy Nuclear Piping System. Fatigue crack initiation, fatigue crack growth rate and the behaviour of through wall cracked elbows have been evaluated by carrying out tests on 90 degree large radius, 219 mm outer diameter and 15.1 mm nominal thickness elbows. The tests have been conducted on healthy elbow (i.e. without notch) and notched elbows having part through notches at one crown, both crown and at intrados. Number of cycles required for crack initiation obtained experimentally and analytically have been found to compare well. Initiation of crack has been observed from both the surfaces (wall thickness) of the crown of the elbow. Crack length and number of cycles have been obtained experimentally and analytically for a/t <0.6 by evaluating stress intensity factor at the crack tip and the Paris constants obtained from the specimen tests. Crack growth from the intrados has been found to be matching with analytical results. Net section collapse failure under monotonic loading is dominant in the elbow having through wall crack at the crown.
机译：进行了实验和分析研究，以证明高能核管道系统的先漏后泄（LBB）概念设计标准。通过对90度大半径，219毫米外径和15.1毫米标称厚度的肘部进行测试，评估了疲劳裂纹的萌生，疲劳裂纹的生长速率以及贯穿壁裂纹的肘部的性能。测试是在健康的肘部（即没有切口）和有切口的肘部上进行的，该肘部的一部分在一个冠部，两个冠部和每个弓形部都通过切口。已经发现通过实验和分析获得的裂纹萌生所需的循环数可以很好地进行比较。从肘部冠的两个表面（壁厚）都可以观察到裂纹的产生。通过评估裂纹尖端的应力强度因子和从试样测试获得的巴黎常数，可以通过实验和分析得出a / t <0.6的裂纹长度和循环次数。已发现内部裂纹的扩展与分析结果相匹配。在单调载荷作用下，净截面坍塌破坏主要发生在肘部在冠部具有贯穿壁裂缝的弯头中。

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