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首页> 美国政府科技报告 >Comparison of Fracture Toughness Information Derived from the Wide Plate Test and the Deep Notch Test.
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Comparison of Fracture Toughness Information Derived from the Wide Plate Test and the Deep Notch Test.

机译：宽板试验和深槽试验得到的断裂韧性信息比较。

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Wide plate and deep notch tests were carried out on BS1501:161:Grade 32material 25mm thick. It is shown that both test configurations give similar results in terms of the temperature for 0.5% strain to fracture. Analysis of the two specimen types using COD,indicates differences in tolerable defect sizes predicted from the two tests,these differences are thought to be due to differences in residual stress levels between the wide plate and deep notch specimens,the residual stress level being higher in the wide plate specimens. The differences are only significant however below the 0.5% strain transition temperature since above this temperature residual stresses are relieved by yielding in the test plates. Some estimates of the sizes of defects which could cause failure in service as opposed to the calculated tolerable defect sizes which are considered to be safe,show the large margin of safety between tollerable and critical defect sizes.

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