Off-Axis Tensile Behavior of Multistitched Composites

The off-axis tensile behavior of multi-stitched composites was investigated. The off-axis tensile strength, tensile modulus and tensile strain values were determined. Angular deformation, lateral shrinkage and displacement measurements were performed on the composites after the tensile tests. Because of the filament breakages caused by multi-stitching, the tensile strengths and modulus of the multi-stitched composites slightly decreased. According to measurements, normal deformation, or angular deformation or lateral shrinkage were occurred on all tested composites. However, a new failure mode was observed on four directional densely stitched composite. This structure had only lateral shrinkage following the angular deformation.