principal stress
Technical term in mechanics and materials science; refers to the normal stress on a principal plane where shear stress is zero.
主応力を計算して、材料の破壊基準を評価する。
Calculate the principal stresses to evaluate the failure criteria of the material.
Compound of 主 (principal) and 応力 (stress). The exact historical derivation is uncertain; the term is a modern technical coinage.