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一、前言 12型迴转弯曲疲劳试验机是目前各厂、各研究单位广泛采用的一种疲劳試驗机。这种試驗机的負載系統是靠附加砝碼及吊挂砝碼的支架等零件的重量构成,系統初载一般是固定的,平时使用并不拆卸,其重量都是由出厂单位随产品在说明书中注明。在使用中我們发現某仪器厂出产之12型疲劳机之初載重量,有較大的偏差,经标定发现其原标重量最大者竞差2.4公斤,这就势必影响試驗結果的正确性,如果用φ5.97毫米的試棒,1公斤負载产生2.4公斤/毫米~2的弯曲应力,2.4公斤的誤差,便会使弯曲应力相差5.76公斤/毫米~2,这是值得
I. Introduction 12-type bending fatigue testing machine is currently the plant, the research unit widely used as a fatigue testing machine. This test machine load system is based on the additional weight and weight of the bracket hanging weights and other components of the system, the initial load is generally fixed, usually do not use the demolition, the weight is from the factory units with the product manual In the note. In use, we found that the initial load of a 12-type fatigue machine produced by an instrument factory deviated greatly. After the calibration, it found that the weight of the original standard weight was 2.4 kg, which would affect the correctness of the test results. If the test rod with φ5.97 mm, 1 kg load 2.4 kg / mm ~ 2 bending stress, 2.4 kg error, it will make the bending stress difference of 5.76 kg / mm ~ 2, which is worth