stress-free initial strain

例句：

1. 1.The stress-free initial strain of the material is crucial for its performance.
   材料无应力初始应变对其性能至关重要。
2. 2.The engineer used a stress-free initial strain to design the structure.
   工程师使用无应力初始应变设计了结构。
3. 3. The stress-free initial strain helps to prevent cracking and deformation in the material.
   无应力初始应变有助于防止材料开裂和变形。