free field stress

例句：

1. 1. The stress in the free field is causing the structure to deform.
   自由场中的应力正在导致结构变形。
2. 2.The researchers found that the free field stress was affecting the stability of the structure.
   研究人员发现自由场应力正在影响结构的稳定性。
3. 3.The engineers were concerned about the free field stress and how it might affect the structural integrity.
   工程师们担心自由场应力及其可能对结构完整性的影响。