为探究三维深角联Kevlar/EP(环氧树脂)复合材料经纬向的弯曲性能及其失效机理,借助Creo绘图软件建立了材料的1/2几何对称模型,然后利用ANSYS Workbench有限元模拟软件,分析复合材料试样在0.5mm弯曲位移载荷下的损伤机理与力学响应。结果表明:三维深角联Kevlar/EP复合材料表现出各向异性,其中试样的纬向弯曲性能优于经向弯曲性能。试样加载点及支撑点的上下层承载应力相比于其他位置较大,而中间层由于处在材料的中性面附近无拉伸压缩作用力,应力值较小。在三维深角联Kevlar/EP复合材料承受弯曲位移载荷时,材料承载主体依次为轴向纱线>横向纱线,树脂起传递载荷的作用。
To investigate the bending properties and failure mechanisms of warp and weft-direction specimens in three-dimensional (3D) deep-angle-interlocked (3DAAI) Kevlar/EP composites,this study employed Creo modeling software to establish a 1/2 geometric symmetry model of the material.Subsequently,ANSYS Workbench finite element simulation software was utilized to analyze the damage mechanisms and mechanical responses of the specimens under a bending displacement load of 0.5mm.The results indicated that the 3DDAI Kevlar/EP composites exhibited anisotropy,with superior weft-direction bending performance compared to the warp-direction.Higher stress concentrations were observed in the upper and lower layers at the loading and support points,whereas the intermediate layers,located near the bending neutral plane of the material,experienced minimal stress due to the absence of significant tensile or compressive forces.When subjected to bending displacement loads,the primary load-bearing constituents within the 3DDAI Kevlar/EP composites followed the hierarchy:axial yarns>transverse yarns,with the resin matrix functioning primarily to transmit loads.
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基金资助
江苏省研究生科研与实践创新计划项目(KYCX24＿3523)
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