Abstract
Tension, compression and combined tension-compression biaxial tests were performed on three types of glass fabric reinforced plastic laminates, and the applicability of an interaction formula was investigated. Based on these results a new combined tension-compression biaxial failure criterion have been derived. The results obtained are as follows;
(1) The interaction formula can be used practically as the uniaxial failure criterion of glass fabric laminates when it is transformed into the equation containing tensile or compressive strength in the direction having an angle of 45 degree to one of the anisotropic axes.
(2) In the case of closely woven plain fabrics, the interaction formula can be applied as the combined tension-compression biaxial failure criterion, but in the case of coarsely-woven plain fabrics, the calculated values do not agree well with the experimental results.
(3) The values calculated according to the new combined tension-compression biaxial failure criterion agree fairly with the experimental results. When this criterion is applied to the case of uniaxial loading, the formula becomes the same as that of the uniaxial failure criterion given in (1).
