中文摘要：

为提高应力应变转换最终应力结果的准确度，根据应力应变转换的一般步骤，分析了其中基准时间选取、无应力计可靠性分析、徐变参数公式拟合、应力增量加载方式和应变计组平衡等关键问题，结果表明：基准时间选取缺少一个科学合理的定量原则；无应力计可靠性分析缺少一个可行的分析评判准则；徐变参数公式拟合应该采用全局优化算法；应力增量加载方式应该采用中点瞬时加载终点结束，得到终点时刻应力的方式；对于应变计组平衡问题，基于概率论将平衡问题转化成最优化问题，提出了最优化平衡法，数学实验结果证明该方法是一种科学合理的平衡方法。

英文摘要：

In order to improve the accuracy of the final stress result in stress-strain conversion , we analyze some key problems , including the reference time selection , non-stress gauge reliability , formula fitting of creep parameters , stress increment loading mode , and strain gauge set balance , according to general steps of stress-strain conversion .The analysis results show that the reference time selection lacks a scientific and reasonable quantitative principle, the non-stress strain gauge reliability analysis lacks a feasible evaluation criterion , the formula fitting of creep parameters requires a global optimization algorithm , and the stress increment loading mode requires instantaneous loading at the midpoint and ending at the endpoint .Meanwhile , based on the probability theory , the problem of strain gauge set balance is transformed into an optimization problem , and an optimization balance method is put forward , and proven to be scientific and reasonable through a mathematical experiment .