ASTM E561-1998
R-曲线测定

Standard Practice for R-Curve Determination

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标准号

ASTM E561-1998

发布日期

1998年

实施日期

废止日期

无

中国标准分类号

H20

国际标准分类号

77.040.10 (Mechanical testing of metals)

发布单位

美国材料与试验协会

适用范围

1.1 This practice covers the determination of resistance to fracturing of metallic materials by R-curves using either the center-cracked tension panel M(T), the compact specimen C(T), or the crack-line-wedge-loaded specimen C(W), to deliver applied stress intensity factor, K, to the material. An -curve is a continuous record of toughness development in terms of KR plotted against crack extension in the material as a crack is driven under a continuously increased stress intensity factor, .

1.2 Materials that can be tested for -curve development are not limited by strength, thickness, or toughness, so long as specimens are of sufficient size to remain predominantly elastic throughout the duration of the test.

1.3 Specimens of standard proportions are required, but size is variable, to be adjusted for yield strength and toughness of the materials.

1.4 Only three of the many possible specimen types that could be used to develop -curves are covered in this practice.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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