Design of Composite Laminate Joints
Project Abstract / Summary : Laminated Composite materials have characteristics of high modulus/weight and strength/weight ratios, excellent fatigue properties, and non-corroding behavior. These advantages encourage the extensive application of composite materials, for example, in sports and aerospace. The understanding of the mechanical behavior of composite materials is essential for their design and application. Adhesive joints have many advantages over the traditional mechanical fastened or riveted, bolted joints such as high strength-to weight ratio, electrical and/or thermal insulation, conductivity, corrosion, design flexibility, lower cost, ease of fabrication and fatigue resistance. Joining technologies and therefore adhesives become an important role in composites.
New joint designs are proposed for adhesive bonding of Composites. The objective is to reduce or eliminate the failure modes associated with delamination and tensile failure of the surface plies that are often observed in lap joints, and provide for a better stress distribution in the adhesive. Finite-element evaluations of the internal stresses in laminates, joined in both the conventional lap method and the new manner will be done to find out if the proposed load-transfer mechanisms improve joint efficiency by substantially increasing the size of adhesively bonded areas, and by making the stresses in the adherends nearly uniform through the thickness of the laminate. In this work, specimens are prepared in the laboratory using vacuum bag technique with bi-woven epoxy glass as fiber (220gsm) & with epoxy resin (Araldite GY257) as an adhesive. The specimens are prepared for testing as per ASTM 3039 standards to estimate the tensile properties.
Why did you choose to work on this project topic : Because we wanted to eliminate the failure modes that is associated with the joints present now. we wanted to come up with something economical and efficient. in future these joints will be of great use because of its mechanical properties and design.
Project Category : Mechanical / Automobile / Aeronautical
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Institute/College Name: Vellore Institute of Technology
City: vellore
State: tamil nadu
Participating Team From: Final Year
New joint designs are proposed for adhesive bonding of Composites. The objective is to reduce or eliminate the failure modes associated with delamination and tensile failure of the surface plies that are often observed in lap joints, and provide for a better stress distribution in the adhesive. Finite-element evaluations of the internal stresses in laminates, joined in both the conventional lap method and the new manner will be done to find out if the proposed load-transfer mechanisms improve joint efficiency by substantially increasing the size of adhesively bonded areas, and by making the stresses in the adherends nearly uniform through the thickness of the laminate. In this work, specimens are prepared in the laboratory using vacuum bag technique with bi-woven epoxy glass as fiber (220gsm) & with epoxy resin (Araldite GY257) as an adhesive. The specimens are prepared for testing as per ASTM 3039 standards to estimate the tensile properties.
Why did you choose to work on this project topic : Because we wanted to eliminate the failure modes that is associated with the joints present now. we wanted to come up with something economical and efficient. in future these joints will be of great use because of its mechanical properties and design.
Project Category : Mechanical / Automobile / Aeronautical
------------------------------------------------------
Institute/College Name: Vellore Institute of Technology
City: vellore
State: tamil nadu
Participating Team From: Final Year
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