温度试验加速加载有效性分析

目的分析某试件温度试验采用的加速加载方法的有效性和该试验的有效性。方法应用加速试验理论,利用Arrhenius稳态温度加速模型,识别并分析其加载的加载因子和加载方法是否合理有效,通过活化能范围判断加速加载的方法和阈值是否合理。通过预期目标结果对比试验实测数据,分析试验是否达到了预期温度,通过测点温度和温度极限、重要位置的表面温度梯度数据比较,判断试验是否合理有效。结果当活化能范围在0.675～1.3 eV之间时,采用的加速加载方法是有效的,且温度应力上、下限以及加速因子合理,实测的测点温度和重要位置的温度梯度同目标结果接近。结论该试验所采用的加速因子和温度阈值合理,通过提高温度应力加载,合理有效地降低了试验运行时间,节约了成本。

Effectiveness of Accelerated Test for Temperature Test

Objective To analyze the effectiveness of the method of accelerated test and the effectiveness of the test. Methods The theory of accelerated test and the Arrhenius model were used to analyze the principle and the method of the temperature test. The reasonability of the acceleration method and limit was judged according to the range of the activation energy. The temperature and temperature gradient of important location were introduced and compared by test results and expected ones to explain the feasibility of the accelerated method and prove the validity of the test. Results The method of accelerated test was effective when Ea varied from 0.675 eV to 1.3eV, and the upper limit, lower limit and accelerated factor of temperature were appropriate. The temperature measured at the measuring spot and the temperature gradient in important positions were close to the target result. Conclusion The AF and temperature limit of the accelerated temperature test are proved with good reason. Accelerating the temperature and stress could effectively and reasonably reduce the time and cost of test.