Shear Nonlinearity Behaviour of Fibrous Composites under Cyclic Loading

This paper presents an experimental investigation of the shear behaviour of UD fibre glass epoxy under cyclic loading. Experimental data of such materials under loading cycles، involving loading، unloading، reversed loading، unloading from reversed loading and reloading، are essential. Cyclic rail shear fixture (CRSF) as a modified version of ASTM D 4255/D 4255 M fixture has been used in this study. Some specimens tested under low cycle fatigue loading. The results of nonlinearity and level of damage in these specimens are considerable. In part II، a model applies to any phase of the cyclic loading up to failure. The model has been compared with test results. Excellent agreements between the predic-tion and experimental results have been observed in all respects.