A Study on the Room-Temperature Curvature Shapes of Unsymmetric Laminates Including Slippage Effects

Author:

Cho Maenghyo1,Kim Min-Ho1,Choi Heung Soap2,Chung Chung Hwa2,Ahn Kyu-Jong2,Eom Yong Sung3

Affiliation:

1. Department of Aerospace Engineering, Inha University, 253 Yong-Hyun Dong, Nam Gu, Inchon, 402-751, Republic of Korea

2. Korea Institute of Aerospace Technology, Korean Air, 461-1, Jeon Min-Dong, Yu Seong-Gu, Tae Jeon, 305-390, Republic of Korea

3. Composite and Polymers Lab, EPFL, Lausanne, Switzerland

Abstract

The room-temperature shapes of cured unsymmetric composite laminates have out-of-plane warping after autoclave processing. In addition, they exhibit two stable room-temperature configurations due to snap-through phenomena when the side length of laminates exceed a critical value. The cured shape of unsymmetric laminates are influenced by many factors. Experiments show that the effect of tool-plate cannot be ignored and has significant influence on the cured shape. This study examines slippage effects resulting from the interaction between the laminates and the tool-plate which are ignored in the previous researches. By introducing a dimensionless slippage coefficient and correlating the corresponding value with experimental results, the influence of processing parameters is investigated. Modeling is extended to predict curvatures of general lamination layup configurations.

Publisher

SAGE Publications

Subject

Materials Chemistry,Mechanical Engineering,Mechanics of Materials,Ceramics and Composites

Reference12 articles.

1. 3. Tsai, S. W. and H. T. Hahn. 1980. Introduction to Composite Materials, Technomic Publishing Co., Inc., pp. 342-357.

2. Calculations of the Room-Temperature Shapes of Unsymmetric Laminatestwo

3. Effect of residual shear strain on the cured shape of unsymmetric cross-ply thin laminates

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