High-Temperature Creep Testing Method using Small Sample Specimens

小冲头蠕变（SPC）测试是使用微型样本的半破坏性测试之一。对影响SPC试验结果的一些因素进行了实验研究，发现当破裂寿命小于1000小时时，在空气中进行的破裂寿命与在真空中进行的破裂寿命有较大差异。该结果取决于氧化膜和摩擦系数的影响。然而，当断裂范围相同时，常规单轴蠕变试验中的应力与SPC试验中的载荷之间存在良好的相关性。这种关系有助于评估长期使用的部件在高温下的剩余蠕变寿命。

Small Punch Creep (SPC) test is one of the semi-destructive tests employing miniature specimens. Some factors of the SPC test affecting test results were experimentally studied.It was found that rupture lives conducted in air were quite different from those in vacuumwhen the rupture life was shorter than 1000 hours. This result depended on the influenceof the oxide film and the coefficient of friction. However, there was a good relation betweenthe stress in the conventional uni-axial creep test and the load in the SPC test when therupture rife was the same. This relationship helps to evaluate remaining creep life oflong-term serviced components under elevated temperatures.