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首页> 外文期刊>Journal of testing and evaluation >Corrected Procedure for Crack Length Calculation by the Unloading Compliance Technique for Charpy-sized Specimens
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Corrected Procedure for Crack Length Calculation by the Unloading Compliance Technique for Charpy-sized Specimens

机译：夏比尺寸试样的卸载顺应技术对裂纹长度计算的修正程序

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摘要

The problems with crack length determination by the unloading compliance method are well known for Charpy-sized specimens. The final crack lengths calculated for bend specimens do not fulfill ASTM E 1820 accuracy requirements. Some investigations have been performed to resolve this problem by correcting the compliance value, but satisfactory results were not obtained. In the present work the measured specimen compliance was taken as a correct value and the calculation procedure was modified. On the basis of experimentally obtained compliances of bent specimens and optically measured crack lengths, a calculation procedure enabling accurate crack length calculation up to 5 mm of plastic deflection was developed. Applying the new procedure to a sample of 238 measured crack lengths, more than 80 % of the values fulfilled the ASTM E 1820 accuracy requirement, while the presently used procedure provided only about 30 percent valid results. The newly proposed procedure also can be used prospectively in modified form for specimens other than Charpy-sized.
机译：对于夏比尺寸的试样，通过卸载顺应性方法确定裂纹长度的问题是众所周知的。计算得出的弯曲试样的最终裂纹长度不符合ASTM E 1820的精度要求。已经进行了一些研究，以通过纠正合规值来解决此问题，但未获得满意的结果。在本工作中，将测得的样品柔度作为正确值，并修改了计算程序。根据实验获得的弯曲试样的柔度和光学测量的裂纹长度，开发了一种计算程序，该程序可以精确地计算直至5 mm塑性变形的裂纹长度。将新程序应用于238个测量的裂纹长度样本，超过80％的值满足ASTM E 1820精度要求，而目前使用的程序仅提供约30％的有效结果。新提出的程序也可以修改后的形式用于夏比大小以外的其他样本。

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