scholarly journals Flexural Behavior of Sandwich Composite Made of JFRP Honeycomb as Core and GFRP as Skin

2020 ◽  
Vol 01 (04) ◽  
pp. 111-115
Author(s):  
Md. Rakibul Islam ◽  
Md Arifuzzaman ◽  
Asif Karim Neon ◽  
Md. Shahe Duzzaman ◽  
Md. Rafiul Islam
Keyword(s):  
Energy Absorption ◽  
Polymer Composite ◽  
Sandwich Structures ◽  
Fiber Reinforced Polymer ◽  
Flexural Behavior ◽  
Face Sheet ◽  
Sandwich Composite ◽  
Fiber Reinforced ◽  
Steel Mold ◽  
Reinforced Polymer

The increasing demand of lightweight, strong and sustainable materials in aerospace, automobile and marine sectors is leading towards the development of new materials and structures. The sandwich composite is one of them which is well-known for their high strength to weight ratio and the fiber based sandwich structures with cellular core show comparatively good mechanical, acoustic, thermal and energy absorption properties than metallic cellular structure. The purpose of this work is to fabricate a sandwich structure with jute fiber reinforced polymer composite (JFRP) as core and glass fiber reinforced polymer composite (GFRP) as face sheet and to investigate bending properties of the fabricated structures for varying face sheet thicknesses. Skin and core honeycomb strips of the sandwich composites were manufactured using hand layup method and steel mold was used to obtain honeycomb shape. Flexural test results show that face sheet thickness has significant effect on the flexural behavior such as peak load, flexural strength and energy absorption. The failure mechanism during bending tests were also identified which would serve as a basis for future improvement of manufactured composites. The delamination at the interface between the core and the face sheet was the first catastrophic failure during bending. The presented sandwich structures are able to carry a significant amount of load even after failure.

scholarly journals Experimental and modeling investigations of the behaviors of syntactic foam sandwich panels with lattice webs under crushing loads

2021 ◽  
Vol 60 (1) ◽  
pp. 450-465
Author(s):  
Zhilin Chen ◽  
Yu Zhang ◽  
Jun Wang ◽  
Hota GangaRao ◽  
Ruifeng Liang ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Energy Absorption ◽  
Sandwich Structures ◽  
Syntactic Foam ◽  
Sandwich Panels ◽  
Numerical Results ◽  
Fiber Reinforced Polymer ◽  
Fe Model ◽  
Fiber Reinforced ◽  
Reinforced Polymer

Abstract The composite sandwich structures with foam core and fiber-reinforced polymer skin are prone to damage under local impact. The mechanical behavior of sandwich panels (glass fiber-reinforced polymer [GFRP] skin reinforced with lattice webs and syntactic foams core) is studied under crushing load. The crushing behavior, failure modes, and energy absorption are correlated with the number of GFRP layers in facesheets and webs, fiber volume fractions of facesheets in both longitudinal and transverse directions, and density and thickness of syntactic foam. The test results revealed that increasing the number of FRP layers of lattice webs was an effective way to enhance the energy absorption of sandwich panels without remarkable increase in the peak load. Moreover, a three-dimensional finite-element (FE) model was developed to simulate the mechanical behavior of the syntactic foam sandwich panels, and the numerical results were compared with the experimental results. Then, the verified FE model was applied to conduct extensive parametric studies. Finally, based on experimental and numerical results, the optimal design of syntactic foam sandwich structures as energy absorption members was obtained. This study provides theoretical basis and design reference of a novel syntactic foam sandwich structure for applications in bridge decks, ship decks, carriages, airframes, wall panels, anticollision guard rails and bumpers, and railway sleepers.

scholarly journals Characteristics of CFRP/PU foam and GFRP/PU sandwich beams having initial debond between facesheet and core

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Gurpinder Singh Dhaliwal
Keyword(s):  
Polyurethane Foam ◽  
Sandwich Beam ◽  
Fiber Reinforced Polymer ◽  
Flexural Behavior ◽  
Face Sheet ◽  
Sandwich Beams ◽  
Fiber Reinforced ◽  
The Core ◽  
Reinforced Polymer ◽  
Pu Foam

AbstractIn the present investigation, we present, the flexural characteristics of carbon fiber reinforced polymer/polyurethane foam and glass fiber reinforced polymer/polyurethane foam sandwich beams having partial debonding between facesheet and core that acts interfacial degradation and hinders the load transfer between facesheets and core. An initial pre-crack between core and face sheet is created by placing a Teflon sheet at the interface on one end of the beams during the manufacturing of sandwich beams. A comparative analysis is carried out to study the effect of using CFRP and Eglass prepregs as face sheet material on such sandwich beams. The flexural behavior of GFRP/PU sandwich beams having initial debond is characterized and analyzed under both three- and four-point loadings. Lastly, the effect of varying the support span length on the flexural response of CFRP/PU sandwich beam having initial debond is also investigated. It was found that the degraded sandwich beams having woven CFRP facesheets have slightly higher stiffness and peak load level as compared to the sandwich beam having cross ply GFRP facesheets. GFRP/PU foam sandwich beam showed higher ductile behavior prior to progressive failure of the sandwich beam. It was observed that the crack tip of the implanted interfacial debond acts as a medium to trigger the interfacial damage followed by the shear failure of the core due to the progression of the initial crack into the core.

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