Experimental study on the mechanical properties of looped fabric reinforced foam core sandwich composite

In this paper, an experimental study was conducted to determine the efficiency of repair methods for sandwich composites used as hull materials in leisure ships. The method was applied to external, scarf, and step patch repairs using an epoxy bond. The load was described in terms of the hogging and sagging moments applied to the hull by waves. Static and fatigue tests were performed to derive the recovery rate of repaired specimens. The experimental results indicated that the recovery rate of specimens with the scarf patch was the highest at 91.80% when the hogging moment was applied. However, the difference in the recovery rate between hogging and sagging moments was the lowest for specimens with the step patch, and the recovery rate was high at 89.96% and 85.15%, respectively.

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Case Study of Chosen Sandwich-Structured Composite Materials for Means of Transport

Coatings ◽

10.3390/coatings10080750 ◽

2020 ◽

Vol 10 (8) ◽

pp. 750

Author(s):

Pavel Koštial ◽

Zora Koštialová Jančíková ◽

Ivan Ružiak ◽

Milada Gajtanska

Keyword(s):

Mechanical Properties ◽

Experimental Study ◽

Fuel Economy ◽

Standard Test ◽

Impact Testing ◽

Sandwich Composite ◽

Surface Finishes ◽

Bending Behavior ◽

State Of Affairs

Modern means of transport increasingly utilize sandwich constructions. Among other things, the reasons for such state of affairs include the reduced weight of means of transport, and through this, better fuel economy as well as price. This work is dedicated to a systematic experimental study of the influence of various materials and sandwich designs on their mechanical properties. In the framework of experiments, sandwich-structured composites were exposed to two types of stressing: static as well as impact stressing. The testing of prepared samples was performed according to ASTM C-393 Standard, dealing specifically with the bending behavior of sandwich composite constructions and impact testing under the scope of ISO 6603-2 Standard test. In this article we deal with static and impact testing of the eight types of core materials, two types of coatings, two types of surface finishes, and two types of resins with a special emphasis on their use in constructions of some exterior or interior components of transport means.

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Experimental study on the impact characteristics of a sandwich composite with an aluminum foam core

International Journal of Automotive Technology ◽

10.1007/s12239-013-0008-0 ◽

2013 ◽

Vol 14 (1) ◽

pp. 61-66 ◽

Cited By ~ 5

Author(s):

M. S. Han ◽

S. O. Bang ◽

J. U. Cho ◽

S. Lee ◽

C. Cho

Keyword(s):

Experimental Study ◽

Aluminum Foam ◽

Sandwich Composite ◽

Foam Core ◽

Impact Characteristics ◽

The Impact

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Experimental Study on Mechanical Properties of X-Cor Sandwich

Materials Science Forum ◽

10.4028/www.scientific.net/msf.686.411 ◽

2011 ◽

Vol 686 ◽

pp. 411-418 ◽

Cited By ~ 1

Author(s):

Jian Ping Bi ◽

Xu Dan Dang ◽

Xin Li Wang ◽

Jun Xiao ◽

Hai Jun Chen ◽

...

Keyword(s):

Mechanical Properties ◽

Experimental Study ◽

Foam Core ◽

Molding Process ◽

Shear Properties ◽

Insertion Angle ◽

Compression Properties ◽

Tension Properties ◽

Tension Strength

In this study, by changing Z-pin’s insertion parameters, the X-cor sandwich was prepared with vacuum curing molding process. The effects of Z-pin’s insertion angle, insertion density and diameter on compression, shear and tension properties were studied. The results show that Z-pin’s insertion parameters can significantly affect the mechanical properties of X-cor sandwich. The compression properties of X-cor sandwich are reduced, while shear properties are improved by the increase of Z-pin’s insertion angle. As Z-pin’s insertion angle increases the tension modulus increases while the tension strength firstly increases and secondly decreases. The mechanical properties increase with the increase of Z-pin’s insertion density and diameter. Compared with the foam core sandwich, the mechanical properties of X-cor sandwich are significantly improved in both modulus and strength.

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Fabrication and Mechanical Properties of POSS Coated CNTs Reinforced Expancel foam core Sandwich Structures

Current Applied Polymer Science ◽

10.2174/2452271604999201123193149 ◽

2020 ◽

Vol 04 ◽

Author(s):

Wanda Jones ◽

Bedanga Sapkota ◽

Brian Simpson ◽

Tarig A. Hassan ◽

Shaik Jeelani ◽

...

Keyword(s):

Mechanical Properties ◽

High Temperature ◽

Sandwich Structure ◽

Face Sheet ◽

Sandwich Composite ◽

Foam Core ◽

Resin System ◽

Thermal And Mechanical Properties ◽

The Face ◽

Sandwich Composite Structure

Background:: Sandwich structures are progressively being used in various engineering applications due to the superior bending-stiffness-to-weight ratio of these structures. We adapted a novel technique to incorporate carbon nanotubes (CNTs) and polyhedral oligomeric silsesquioxanes (POSS) into a sandwich composite structure utilizing a sonochemical and high temperature vacuum assisted resin transfer molding technique. Objective:: The objective of this work was to create a sandwich composite structure comprised of a nanophased foam core and reinforced nanophased face sheets, and to examine the thermal and mechanical properties of the structure. To prepare sandwich structure, POSS nanoparticles were sonochemically attached to CNTs and dispersed in a high temperature resin system to make the face sheet materials and also coated on expandable thermoplastic microspheres for the fabrication of foam core materials. Method:: The nanophased foam core was fabricated with POSS infused thermoplastic microspheres (Expancel) using a Tetrahedron MTP-14 programmable compression molder. The reinforced nanophased face sheet were fabricated by infusing POSS coated CNT in epoxy resin and then curing into a compression stainless steel mold. Result:: Thermal analysis of POSS-infused thermoplastic microspheres foam (TMF) showed an increase in thermal stability in both nitrogen and oxygen atmospheres, 19% increase in thermal residue were observed for 4 wt% GI-POSS TMF compared to neat TMF. Quasi-static compression results indicated significant increases (73%) in compressive modulus, and an increase (5%) in compressive strength for the 1 wt% EC-POSS/CNTs resin system. The nanophased sandwich structure constructed from the above resin system and the foam core system displayed an increase (9%) in modulus over the neat sandwich structure. Conclusion:: The incorporation of POSS-nanofillier in the foam core and POSS-coated nanotubes in the face sheet significantly improved the thermal and mechanical properties of sandwich structure. Furthermore, the sandwich structure that was constructed from nanophased resin system showed an increase in modulus, with buckling in the foam core but no visible cracking.

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