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提出了一种改进的应力松弛试验方法，并用改进的装置测量了法兰接头紧固螺栓的室温应力松弛值，拟合了松弛方程曲线。根据螺栓应力松弛模型无温度变量的特点，利用ＬＭ 方法把温度引入了松弛模型，据此可推算在一定范围内某一温度和时间下的应力松弛指标。
An improved stress relaxation test method is proposed. The stress relaxation value of the fastening bolt of the flange joint is measured by an improved device, and the relaxation curve is fitted. According to the characteristics of the stress relaxation model of the bolt without temperature variation, the temperature is introduced into the relaxation model by using the LM method, from which the stress relaxation index can be calculated under a certain temperature and time.