Experimental study on the low velocity impact damage and residual tensile properties of Ti/Cf/PEEK hybrid laminates

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (22) : 96-102.

YUAN Xiaosa，Bhuwan Sapkota，GUO Huaxin，ZHONG Lang，PAN Lei

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Abstract

The low velocity impact damage mechanism and tensile properties after impact of Ti/Cf/PEEK fiber metal laminates were studied experimentally.The hybrid laminates were composed of 2/1 and 3/2 ply structures, and the ply angles of the both structures were 0°, 45°, 90°.The impact tests were carried out under the impact energy of 15 J and 25 J respectively.For the two types of ply structures and for the same structure with different ply angles, the impact damage mechanism, residual tensile strength degradation and residual tensile failure mode were compared and analyzed.The results show that the impact damage mechanism of the hybrid laminates with two kinds of ply structures mainly includes the processes of plastic deformation, indentation, formation of damaged areas, cracking, matrix erosion, fiber breakage, delamination, etc..45° layup direction laminates exhibit good impact damage resistance.The residual tensile strength degradation is related to the fiber placement angle.With 0° layup direction the remaining tensile strength of the laminates after impact is the highest, followed by the case of 45°layup direction, the worst is the case of 90°layup direction.The residual tensile failure mode of the 2/1 structural hybrid laminates is approximately brittle fracture, and that of the 3/2 structural laminates has both ductile fracture characteristics and brittle fracture characteristics.

Key words

fiber metal laminate(FML) / low velocity impact / damage mechanism / residual tensile strength degradation law / residual tensile failure mode

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YUAN Xiaosa，Bhuwan Sapkota，GUO Huaxin，ZHONG Lang，PAN Lei. Experimental study on the low velocity impact damage and residual tensile properties of Ti/Cf/PEEK hybrid laminates[J]. Journal of Vibration and Shock, 2020, 39(22): 96-102

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