Manufacturing and low-velocity impact characterization of foam filled 3-D integrated core sandwich composites with hybrid face sheets

In the current work, sandwich composite structures with innovative constructions referred to as Z-pins, or truss core pins, are investigated. The Z-pin core sandwich construction offers enhanced transverse stiffness, high damage resistance, and multi-functional benefits. The present study deals with analysis of low-velocity impact (LVI) of Z-pin sandwich plate, and experimental studies of compression-after-impact characterization. Experimental studies on LVI of Z-pin sandwich plate considered in the analysis have been reported in Vaidya, et al., 1999, “Low Velocity Impact Response of Laminated Sandwich Composites with Hollow and Foam-Filled Z-Pin Reinforced Core,” Journal of Composites Technology and Research, JCTRER, 21, No. 2, Apr., pp. 84–97, where the samples were subjected to 11, 20, 28, 33, and 40 J of impact energy. The LVI analysis is developed with regards to Z-pin buckling as a primary failure mode (and based on experimental observations). A finite element model accounting for buckling of the pins has been developed and analyzed using ABAQUS. This paper also presents experimental results on compression-after-impact (CAI) studies which were performed on the sandwich composites with Z-pin reinforced core “with” and “without” foam. The experimental LVI tests were performed in Vaidya, et al., 1999, “Low Velocity Impact Response of Laminated Sandwich Composites with Hollow and Foam-Filled Z-Pin Reinforced Core,” Journal of Composites Technology and Research, JCTRER, 21, No. 2, Apr., pp. 84–97. The results indicate that selective use of Z-pin core is a viable idea in utilizing space within the core for sandwich composites in structural applications. [S0094-4289(00)02904-2]

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Low Velocity Impact Response of Resin Infusion Molded Foam Filled Honeycomb Sandwich Composites

Journal of Reinforced Plastics and Composites ◽

10.1177/073168449801700904 ◽

1998 ◽

Vol 17 (9) ◽

pp. 819-849 ◽

Cited By ~ 28

Author(s):

U. K. Vaidya ◽

M. V. Kamath ◽

H. Mahfuz ◽

S. Jeelani

Keyword(s):

Impact Response ◽

Low Velocity Impact ◽

Sandwich Composites ◽

Low Velocity ◽

Resin Infusion ◽

Velocity Impact ◽

Honeycomb Sandwich ◽

Foam Filled

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Low Velocity and Compression-After-Impact Response of Pin-Reinforced Sandwich Composites

10.1115/imece1999-0499 ◽

1999 ◽

Author(s):

Uday K. Vaidya ◽

Mohan V. Kamath ◽

Mahesh V. Hosur ◽

Anwarul Haque ◽

Shaik Jeelani

Keyword(s):

Impact Testing ◽

Low Velocity Impact ◽

Sandwich Composites ◽

Low Velocity ◽

Static Compression ◽

Velocity Impact ◽

Transverse Stiffness ◽

Impact Studies ◽

Compression After Impact ◽

The Impact

Abstract In the current work, sandwich composite structures with innovative constructions referred to as Z-pins, or truss core pins are investigated, in conjunction with traditional honeycomb and foam core sandwich constructions, such that they exhibit enhanced transverse stiffness, high damage resistance and furthermore, damage tolerance to impact. While the investigations pertaining to low velocity impact have appeared recently in Vaidya et al. 1999, the current paper deals with compression-after-impact studies conducted to evaluate the residual properties of sandwich composites “with” and “without” reinforced foam cores. The resulting sandwich composites have been investigated for their low velocity (< 5 m/sec) impact loading response using instrumented impact testing at energy levels ranging from 5 J to 50 J impact energy. The transverse stiffness of the cores and their composites has also been evaluated through static compression studies. Compression-after-impact studies were then performed on the sandwich composites with traditional and pin-reinforcement cores. Supporting vibration studies have been conducted to assess the changes in stiffness of the samples as a result of the impact damage. The focus of this paper is on the compression-after-impact (CAI) response and vibration studies with accompanying discussion pertaining to the low velocity impact.

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