主应力比

concentration of rail stresses variation of stresses principal axis of compliance principal moment of inertia principal radius of curvature safety of principal principal invariant of tensor transformation of principal axis principal direction of curvature principal of a loan separation of principal part principal stresses diagram of stresses cyclic variation of stresses residual state of stresses range of alternating stresses balancing of stresses computation of stresses nonlinear distribution of stresses distribution of stresses principle of superimposed stresses