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根据“UG-84,(-b) For Materials of Nominal Thickness Less Than 0.394 in. (10 mm). Where the largest obtainable Charpy V‐notch specimen has a width along the notch of at least 80% of the material nominal thickness, the Charpy test of such a specimen shall be conducted at a temperature not warmer than the minimum design metal temperature.34
Where the largest possible test specimen has a width along the notch of less than 80% of the material
nominal thickness, the test, for Table UCS-23 materials having specified minimum tensile strength of less than 95,000 psi (655 MPa), shall be conducted at a temperature lower than the minimum design metal temperature34 by an amount equal to the difference (referring to Table UG-84.2) between the temperature reduction corresponding to the actual material thickness and the temperature reduction corresponding to the Charpy specimen width actually tested.”的要求,对于公称壁厚小于10mm的材料,可获取试样缺口宽度小于材料公称厚度的80%时的试验温度确认,是否是低于最小设计温度的一个数值(实际壁厚降低的温度值和实际缺口宽度降低的温度值差值)。
例如
1) 最小设计温度为-29摄氏度
2) 实际壁厚为5mm(试验温度相比最小设计金属温度降低11摄氏度)
3) 夏比冲击试样缺口宽度为2.5mm,小于材料公称壁厚的80%(试验温度相比最小设计金属温度降低28摄氏度)
则试验温度=(-29)-[(-11)-(-28)]=-46摄氏度。
这样理解对吗? |
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