| A PREDICTIVE APPROACH TO THE IN-PLANE MECHANICAL PROPERTIES OF STITCHED COMPOSITE LAMINATES |
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| 作者姓名： | Zhang Junqian Wei Yuqing |
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| 作者单位： | Shanghai Institute of Applied Mathematics and Mechanics，Shanghai University，Shanghai 200072，China |
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| 基金项目： | Project supported by the Excellent Young Teachers Program of the Ministry of Education of China，the Shu-Guang Program of the City of Shanghai，the National Natural Sciences Foundation of China(No.10372120)，Shanghai Leading Academic Discipline Project(No.Y0103). |
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| 摘 要： | This contribution attempts to model the alteration of the in-plane elastic properties in laminates caused by stitching,and to predict the in-plane effective tensile strength of the stitched composite laminates.The distortion of in-plane fibers is considered to be the main cause that affects the in-plane mechanical properties.A fiber distortion model is proposed to characterize the fiber misalignment and the fiber content concentration due to stitching.The undistorted region,the fiber distortion region,the resin-rich pocket and the through-thickness reinforcement section are taken into account.The fiber misalignment and inhomogeneous fiber content due to stitching have been formulated by introducing two parameters,the distortion width and maximum misalignment.It has been found that the ply stress concentration in stitched laminates is influenced by the two concurrent factors,the stitch hole and inhomogeneous fiber content.The stitch hole brings about the stress concentration whereas the higher fiber content at the local region induced by stitching restrains the local deformation of the composite.The model is used to predict the tensile strength of the 0/45/0/-45/90/45/0/-45]_(2s) T300/QY9512 composite laminate stitched by Kevlar 29 yarn with different stitching configurations,showing an acceptable agreement with experimental data.
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| 关 键 词： | 复合材料 纤维畸变 平面内弹性道具 复合层板 |
| 收稿时间： | 25 November 2006 |
| 修稿时间： | 2006-11-252007-03-23 |
A PREDICTIVE APPROACH TO THE IN-PLANE MECHANICAL PROPERTIES OF STITCHED COMPOSITE LAMINATES |
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| Zhang Junqian Wei Yuqing.A PREDICTIVE APPROACH TO THE IN-PLANE MECHANICAL PROPERTIES OF STITCHED COMPOSITE LAMINATES[J].Acta Mechanica Solida Sinica,2007,20(2):130-140. |
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| Authors: | Zhang Junqian Wei Yuqing |
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| Institution: | 1. Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11120 Belgrade, Serbia;2. Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Knez Mihailova 35/IV, 1100 Belgrade, Serbia;3. University of Elmergib, Chemical Engineering Department, El-Khums, Libya;1. Univ. Lille Nord de France, F-59000 Lille, France;2. ENSAIT, GEMTEX, F-59100 Roubaix, France;3. INSERM 1189 ONCO-THAI, Lille University Hospital – CHRU, France |
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| Abstract: | This contribution attempts to model the alteration of the in-plane elastic properties in laminates caused by stitching,and to predict the in-plane effective tensile strength of the stitched composite laminates.The distortion of in-plane fibers is considered to be the main cause that affects the in-plane mechanical properties.A fiber distortion model is proposed to characterize the fiber misalignment and the fiber content concentration due to stitching.The undistorted region,the fiber distortion region,the resin-rich pocket and the through-thickness reinforcement section are taken into account.The fiber misalignment and inhomogeneous fiber content due to stitching have been formulated by introducing two parameters,the distortion width and maximum misalignment.It has been found that the ply stress concentration in stitched laminates is influenced by the two concurrent factors,the stitch hole and inhomogeneous fiber content.The stitch hole brings about the stress concentration whereas the higher fiber content at the local region induced by stitching restrains the local deformation of the composite.The model is used to predict the tensile strength of the 0/45/0/-45/90/45/0/-45]_(2s) T300/QY9512 composite laminate stitched by Kevlar 29 yarn with different stitching configurations,showing an acceptable agreement with experimental data. |
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| Keywords: | stitched composites fiber distortion in-plane elastic properties in-plane tensile strength and micromechanics |
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