Second-order tensor σ_{ij} that gives the force per unit area transmitted across an oriented surface element with normal n: t_i = σ_{ij} n_j. Symmetric in the absence of body couples (σ_{ij}=σ_{ji}).
Second-order tensor σ_{ij} that gives the force per unit area transmitted across an oriented surface element with normal n: t_i = σ_{ij} n_j. Symmetric in the absence of body couples (σ_{ij}=σ_{ji}).