proportional elastic limit

例句：

1. 1.The material's proportional elastic limit is critical for its performance.
   该材料的弹性极限对其性能至关重要。
2. 2.The engineer determined the proportional elastic limit of the beam using finite element analysis.
   工程师使用有限元分析确定了梁的弹性极限。
3. 3.The design must consider the proportional elastic limit to prevent overstressing during operation.
   设计时必须考虑弹性极限以防止操作过程中过应力。