恒应力 meaning in Chinese

constant stress

By using moire method , three groups of pmma specimens with single edge crack were experimentally researched under constant stress , especially the strain field around crack - tip . through measure and analysis , we could see its time dependence clearly . we compared the actual strain distribution with the theoretical linear viscoelastic strain distribution
利用云纹法，对四组含边裂纹的pmma试件在恒应力条件下的裂尖周围的应变场进行了测定、分析，可以看出其明显的时间相关性，并与基于线弹性假设的裂尖应变场进行了对比。