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冲击冲击试验机的自动控制及示波照相,对于检验材料在高、低温情况下的冲击机械性能,具有重大的意义。在作常温冲击机械性能试验时,试样在试验机上的放置时间,通常对试验结果没有影响(试样放置的准确度可用样规来测量)。但在高、低温试验时,则对试样的放置时间需严格地控制,时间过长将导致试样的温度降低或回升,影响了试验结果。因此在高、低温试验时,要求试样从加热装置(或冷却装置)内送出起,迅速而准确地放置在试验机上,一直到做完试验为止,应在一秒钟内完成。在这样短的时间内依靠手动操作是不可能的。冲击示波照相为分析研究材料在各种试验温度下的断裂过程提供条件。即能从拍摄的图片2、3上研究确定最大作用力、断裂的脆性或韧性所占的比例、吸收能、切口弯曲参数、断裂韧性、动力强度和其它情况之间的变形时间关系等。
Impact and impact testing machine automatic control and oscillographic camera for the inspection of materials in high and low temperature impact mechanical properties, of great significance. During the mechanical properties test at room temperature, the test sample is placed on the testing machine and usually has no influence on the test result (the accuracy of the test sample can be measured by the sample gauge). However, in the high and low temperature test, the sample placement time should be strictly controlled. Excessive time will cause the sample temperature to decrease or rise, which will affect the test results. Therefore, high and low temperature test, the sample from the heating device (or cooling device) sent out, quickly and accurately placed on the testing machine, until done testing should be completed within one second. It is not possible to rely on manual operation in such a short period of time. Impact oscillography provides the basis for analyzing the fracture process of materials at various test temperatures. That is, the maximum force, the ratio of the brittleness or toughness of the fracture, the absorption energy, the bending parameter of the incision, the fracture toughness, the strength of the fracture, and the deformation time relationship between the other conditions can be studied from the pictures 2,