A Numerical Simulation and Parametric Study of Z-Pin Reinforced Composite T-Joints at Tensile Load

Abstract

Abstract:

Abstract： A numerical simulation model for the tensile process of Z-pin reinforced composite T-joints was established by utilizing the cohesive zone model and a parametric study was performed for the distribution of Z-pins. The force-displacement curve of the Z-pin pullout process was obtained by the experiments of Zpin bridging laws. This curve was transformed into the cohesive parameters of the pinned region to simulate the enhancement of Z-pins to T-joints. The reliability of this model was verified by the static tensile test. Based on the proposed model, the influence of the Z-pin distribution on the tensile capability of T-joints was examined. The results show that as the column spacing decreasers, the pullout force and ultimate load increase. The row spacing has a small effect on the structural bearing capacity. The pullout force is decreased significantly when the distance between Z-pins and the axial plane is increased.

Key words: composite, T-joints, Z-pin, cohesive zone model, parametric study

CHEN Shaoqing1，CHEN Xiuhua1，KONG Bin2，WANG Hai1，QIU Xueshi2. A Numerical Simulation and Parametric Study of Z-Pin Reinforced Composite T-Joints at Tensile Load[J]. Journal of Shanghai Jiaotong University, 2015, 49(09): 1404-1410.

References

［1］Dugdale D S. Yielding of steel sheets containing slits［J］. Journal of the Mechanics and Physics of Solids, 1960, 8: 100108.

［2］Aymerich F, Dore F, Priolo P. Prediction of impactinduced delamination in crossply composite laminates using cohesive interface elements［J］. Composite Science and Technology, 2008, 68（12）: 23832390.

［3］Ata??塂 A, Soutis C. Application of cohesive zone elements in damage analysis of composites: Strength prediction of a singlebolted joint in CFRP laminates［J］. International Journal of NonLinear Mechanics, 2014, 66: 96104.

［4］Shi Y, Swait T, Soutis C. Modelling damage evolution in composite laminates subjected to low velocity impact［J］. Composite Structures, 2012, 94（9）: 29022913.

［5］Guo S, Morishima R. Numerical analysis and experiment of composite sandwich Tjoints subjected to pulling load［J］. Composite Structures, 2011,94（1）:229238.

［6］Bianchi F, Koh T M, Zhang X, et al. Finite element modelling of zpinned composite Tjoints［J］.Composites Science and Technology, 2012,73（23）:4856.

［7］王杰,余音,汪海.泡沫夹层T型接头失效分析与局部几何参数设计［J］. 南京航空航天大学学报, 2010, 42(3): 374378.

WANG Jie, YU Yin, WANG Hai. Failure analysis and local geometric parameter design for foam core sandwich Tjoints［J］. Journal of Nanjing University of Aeronautics & Astronautics, 2010, 42(3): 374378.

［8］朱亮,崔浩,李玉龙,等.含缺陷复合材料T型接头失效数值分析［J］. 航空学报，2012, 33(2): 287296.

ZHU Liang, CUI Hao, LI Yulong, et al. Numerical simulation of the failure of composite Tjoints with defects［J］. Acta Aeronauticaet Astronautica Sinica, 2012, 33(2): 287296.

［9］Koh T, Feih S, Mouritz A. Strengthening mechanics of thin and thick composite Tjoints reinforced with zpins［J］. Composites Part A: Applied Science and Manufacturing, 2012, 43（8）: 13081317.

［10］Bianchi F, Zhang X. A cohesive zone model for predicting delamination suppression in zpinned laminates［J］. Composites Science and Technology, 2011, 71（16）: 18981907.

［11］张涛涛,周洪,史文华,等. Zpin植入对二维机织复合材料层合板力学性能影响的数值模拟［J］. 复合材料学报, 2014, 31(2): 295303.

ZHANG Taotao, ZHOU Hong, SHI Wenhua, et al. Numerical simulation of the Zpin inserting effect on mechanical properties of 2D woven composite laminate［J］. Acta Materiae Compositae Sinica, 2014, 31(2): 295 303.

［12］董晓阳,李勇,张向阳,等. Zpin增强树脂基复合材料单搭接连接性能［J］. 航空学报, 2014, 35(5): 13021310.

DONG Xiaoyang, LI Yong, ZHANG Xiangyang, et al. Performance of polymer composite single lap joints reinforced by Zpin［J］.Acta Aeronauticaet Astronautica Sinica, 2014, 35(5): 13021310.

［13］李成虎,燕瑛. Zpin增强复合材料T型接头层间性能的建模与分析［J］.复合材料学报,2010, 27(6): 152157.

LI Chenghu, YAN Ying. Modeling and analysis of zpin reinforcing in throughthickness direction of composite Tjoint［J］.Acta Materiae Compositae Sinica, 2010, 27(6): 152157.

［14］Dai Shaocong, Yan Wenyi, Liu Hongyuan, et al. Experimental study on zpin bridging law by pullout test［J］. Composites Science and Technology, 2004, 64（16）: 2451 2457.

［15］Cartie D D R, Cox B N, Fleck N A. Mechanisms of crack bridging by composite and metallic rods［J］. Composites Part A: Applied Science and Manufacturing, 2004, 35（11）: 13251336.

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