ASTM E740-1988(1995)e1

Standard Practice for Fracture Testing with Surface-Crack Tension Specimens

非常抱歉，我們暫時無法提供預覽，您可以試試： 免費下載 ASTM E740-1988(1995)e1 前三頁，或者稍后再訪問。

如果您需要購買此標準的全文，請聯系： 。

注意： 點擊下載后，生成下載文件時間比較長，請耐心等待......

非常抱歉，我們暫時無法提供預覽，您可以試試： 免費下載 ASTM E740-1988(1995)e1 前三頁，或者稍后再訪問。

注意： 點擊下載后，生成下載文件時間比較長，請耐心等待......

標準號

ASTM E740-1988(1995)e1

發布日期

1988年

實施日期

廢止日期

無

國際標準分類號

77.040.10 (Mechanical testing of metals)

發布單位

US-ASTM

適用范圍

1.1 This practice covers the design, preparation, and testing of surface-crack tension (SCT) specimens. It relates specifically to testing under continuously increasing load and excludes cyclic and sustained loadings. The quantity determined is the residual strength of a specimen having a semielliptical or circular-segment fatigue crack in one surface. This value depends on the crack dimensions and the specimen thickness as well as the characteristics of the material.

1.2 Metallic materials that can be tested are not limited by strength, thickness, or toughness. However, tests of thick specimens of tough materials may require a tension test machine of extremely high capacity. The applicability of this practice to nonmetallic materials has not been determined.

1.3 This practice is limited to specimens having a uniform rectangular cross section in the test section. The test section width and length must be large with respect to the crack length. Crack depth and length should be chosen to suit the ultimate purpose of the test.

1.4 Residual strength may depend strongly upon temperature within a certain range depending upon the characteristics of the material. This practice is suitable for tests at any appropriate temperature.

1.5 Residual strength is believed to be relatively insensitive to loading rate within the range normally used in conventional tension tests. When very low or very high rates of loading are expected in service, the effect of loading rate should be investigated using special procedures that are beyond the scope of this practice.

Note 1-Further information on background and need for this type of test is given in the report of ASTM Task Group E24.01.05 on Part-Through-Crack Testing (1).

1.6 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.