A Numerical and Experimental Study on Bending of Glass Fiber Metal Laminate Composite for Reducing Resultant Defects

Document Type : Research Article

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Abstract

Nowadays, fiber-metal laminate composites are highly used by designers due to their good mechanical properties and low weight particularly in aerospace industry. The Fiber Metal Laminate shows improvement over the properties of both aluminum alloys and composite materials. In this study, bending properties of these composites are investigated both numerically and experimentally. Since these multi-layers have a very limited formability and deformation of fibers is pure elastic, the fibers cause some kind of springback that is known as a defect. In the current study, six types of specimens are prepared with variable fiber angles and thickness of layers for bending test. In addition, the bending test is optimized through the Taguchi design experimental method, until the results become independent of die and press parameters. The effects of design and fabrication parameters of fiber- metal composite on the springback are investigated in detail. The results show that the springback increases linearly with increasing punch radius and with decreasing pressure forming due to the reduction of the plastic deformation. On the other hand, by increasing the punch speed, the springback increases slightly because forming by the high-rate punch speed increases the amount of elastic recovery in aluminum sheet and induces larger springback. Moreover, when the fibers are parallel to the bending axis and the thickness of outer layers increase, the bend radius and springback decrease. The obtained results are compared partially with the FE numerical results.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 47, Issue 2 - Serial Number 2
February 2016
Pages 13-22

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