论文部分内容阅读
试验要求在金属材料弯曲试验时,有关技术文件规定,当金属材料达到一定(α)角度时,也就是在未卸除负荷的情况下,达到或者超过一定弯曲角度(α),该角度为弯曲试验中的规定角(图1)。图1在未卸除负荷的情况下,要想精确测量试样的弯曲角度是有一定的困难,因为压头及支座妨碍测量,影响测量精度、如果在卸除负荷后,再进行测量弯曲角度,所测得的数据,是不符合技术条件所要求的,因为卸除负荷以后,试样必然有一定的回弹量,就是说在试验机上未卸除负荷时所测得试样的弯曲角是合格的,但卸除外力后再进行测量试样的弯曲角,可能会出现不合格的现象(图2),为了准确的按国家
Test requirements In the bending test of metallic materials, the relevant technical document states that when the metallic material reaches a certain angle (α), that is to say it reaches or exceeds a certain bending angle (α) without bending off the load, the bending angle Test the specified angle (Figure 1). Figure 1 In the case of unloading unloading, in order to accurately measure the bending angle of the sample is a certain difficulty, because the pressure head and bearing impede the measurement, affecting the measurement accuracy, if the load is removed after the measurement of bending Angle, the measured data is not meet the technical requirements, because after the removal of the load, the sample must have a certain amount of springback, that is not on the test machine when the load is not measured under the measured bending Angle is qualified, but after removing the external force and then measuring the bending angle of the sample, there may be unqualified phenomenon (Figure 2), in order to accurately by country