Stiffness changes in laminates caused by intralaminar cracks and shear deformation Academic Article uri icon

abstract

  • An experimental study has been conducted to study stiffness changes in laminates containing inclined (off-axis) plies. The class of laminates studied is glass-epoxy (0, ± θ4, 01/2)s with θ = 25, 40, 55 and 70. It is found that for 0>40 multiple cracks occur in the θ-plies while for 6<40 no cracks are found. However, for all θ angles the laminate moduli change. A continuum damage mechanics approach is used to calculate stiffness changes due to cracks. In the absence of cracks the shear modulus reduction in the θ-plies, determined from independent tests on a (±45)s laminate, is found to provide good prediction of the observed stiffness changes.

published proceedings

  • American Society of Mechanical Engineers, Materials Division (Publication) MD

author list (cited authors)

  • Varna, J., Akshantala, N. V., & Talreja, R

complete list of authors

  • Varna, J||Akshantala, NV||Talreja, R

publication date

  • December 1997