principal axis of stress tensor

例句：

1. 1. The stress tensor is a mathematical tool used to analyze the behavior of materials under different loads.
   应力张量是一种数学工具，用于分析材料在不同载荷下的行为。
2. 2.In the study of earthquake engineering, understanding the principal axis of stress is crucial for designing safe buildings.
   在地震工程研究中，理解应力张量的主轴对于设计安全建筑至关重要。
3. 3. The stress tensor can be used to predict the deformation and failure of structures under various loading conditions.
   应力张量可用于预测结构在各种加载条件下的变形和破坏。