论文部分内容阅读
在高温下,我们既在大气中做金属的氧化试验,又在大气中做金属的持久强度试验而且把这种持久强度试验结果做为一个单纯的强度性能来考虑,这是值得思考的。因为我们在大中做持久强度试验,得到的一套抽伸与氧化综合作用的结果。很明显,由于逐渐氧化,作试样的有效横截面积逐渐减小。由持久强度法所规定的恒定载荷下的试验,应力是基本不变的,而实际试验中的应力是逐渐增大的。这将对持久强度试样的寿命发生影响,持续时间越长影响越大,对持续时间长的小试样影响就更大。这不仅会影响持久强度的外推精度,而且对合理地确定另件的氧化附
At high temperature, it is worth considering that both the oxidation test of metal in the atmosphere and the durability test of metal in the atmosphere should be considered as a mere strength property. Because we do long-term strength test in large and medium, get a result of the combined effect of pumping and oxidation. Obviously, due to the gradual oxidation, the effective cross-sectional area of the sample is gradually reduced. The test under constant load, as stipulated by the Durable Strength Method, shows that the stress is essentially constant while the stress in the actual test is gradually increased. This will affect the longevity of long-lasting strength samples, the longer the longer the impact, the longer lasting small sample impact even greater. This not only affects the extrapolation accuracy of the long-lasting intensity, but also a reasonable determination of the oxidation attachment