Abstract: This paper investigates the ultimate failure behavior of0/90/0crossplylaminates under uniaxial tension.A modified shear-lag model is first proposed for solvingthe stress redistributions due to both the failure of the 90° ply and the breakage of somefibers in the 0° plies. Next,the random critical-core probability model is used to analyzemicroscopically the ultimate failure of crossply laminates. The predictions of the ultimatefailure strength of0_2/90_m_s and0_4/90_m_s graphite epoxy and 0_4/90_m_s ...