◦ Tensile stress t = h kos (45 ) 0 σ = P/tl t = 0.707h t l σ = P/0.707hl t P h 45 O t P ◦ Load h P = 0.707 hl σ t ◦ Two side of plate P = 2(0.707 hlσ ) = 1.414 hlσ t 122 t