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RISS 인기검색어
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- 저자 : Zhongxiang Pan (검색결과 2 건)
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Zhongxiang Pan,Heng Ma,Zhenyu Wu,Xiaohong Zhou 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4
Transverse bending damage morphologies of carbon fiber composite tubes with different ply structures wereinvestigated by the micro-XCT characterization. Structural effects of the plain, twill and winding on the damage mechanismwere analyzed. The experimental results present fiber-resin cracking, interlayer delamination and fiber tows breakage withstructural deformation from the peak load to final catastrophic failure. Woven fabric plies in the plain and twill compositetubes cannot be effectively slipped because of their tight interlaced structures, which makes the load propagate along the warpand weft fiber tows, resulting in more fiber tows breakage under bending-induced stretching. There is no interlaced effect onthe failure mechanism for the winding tubes, resulting in a fact that the bending load can only be transferred from the fiberresinor the layer-to-layer interface, with more interlaminar slippage and obvious springback behaviors under in-plane shear. For investigating the interlaced effect on failure mechanism, plain and winding models under transverse bending wereestablished using continuous shell elements, and different constitutive description were used to simulate interlayer failure andintra-layer failure behaviors. By comparing the numerical results with the experimental ones, the influence of the fabricstructure on the failure behavior of the tube were analyzed.
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Zhenyu Wu,Yong Shen,Zhongxiang Pan,Xudong Hu 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7
This study aims to investigate the radial gradient structural effect on energy absorption and failure behavior ofbraided composite tubes. Two-layer tubular braided fabrics were fabricated using over-braiding technology with three typesof radial gradient configurations in terms of uninform, descending and ascending pattern. The structure of surface layertouching with indenter roll was found to have a significant role on the bending behavior and failure mode. The compositetube possessing the small angle surface layer tends to fail in top-surface mode characterized by compression damage incontact area between indenter roll and tube. With the increasing of the braiding angle in surface layer, the bottom-surfacefailure mode characterized by penetrating crack in circumferential direction was observed, which accompanies abruptlyloading drop and loss of energy absorption capacity. In addition, the tube in descending gradient pattern contributes to higherflexural modulus and peak load due to high fiber volume fraction, while keeps top-surface failure mode because of loadspreading ability provided by surface layer with small braiding angle. The results show that a proper selection of stackingsequence and braiding angle in multi-layer braided tube is capable of effectively enhancing the energy absorption of tubalstructures under bending load.
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