Tensile mechanical behavior and damage mechanism of 2.5D woven composite with double-shear connection
In order to clarify the influence of assembly parameters on the connection performance of 2.5D woven composite materials,specimens with different width-to-diameter ratios(w/D)and edge-to-diameter ratios(e/D)were prepared.The mechanical behavior and failure modes of the materials under double-lap tensile loads were analyzed,and the internal damage of the specimens was visualized using Micro-CT technology to elucidate the damage mechanism.The results showed that the composites could obtain higher mechanical properties when the hole was made with w/D of 6 and e/D of 3.However,reducing w/D or e/D appropriately could still maintain comparable strength.When w/D decreased to 4,the material decreased of 3.18％in stiffness and 2.77％in ultimate compressive strength.And the material decreased of 1.62％in stiffness and 7.19％in strength when e/D decreased to 2.5.The location parameters of the bolt hole would affect the failure mode of the material.Reducing w/D made the warp yarn bear more load and the failure mode evolved towards net-tension failure,while reducing e/D made the weft yarn bear more load and the failure mode evolved towards tearing failure.
国家科技期刊平台
NSTL
万方数据
