Composite laminates are used in a wide range of applications including defense, automotive, aviation and aerospace, marine, wind energy, and recreational sporting goods. These composite beams still exhibit problems such as buckling, local deformations, and interlaminar delamination. To overcome these drawbacks, a novel viscoelastic autoclave bonding with tapered epoxy reinforcement polyurethane films is proposed. In existing laminates, compression face wrinkling and interlaminar delamination is caused in the sandwich beam. The unique viscoelastic autoclave spunbond interlayer bonding is designed to prevent face wrinkling and absorb and distribute stresses induced by external loads, thereby eliminating interlaminar delamination in the sandwich beam. Also, the existing special reinforcement causes stress concentrations, and the core is not effectively connected, which directly affects the stiffness of the beam. To address this, a novel tapered epoxy polyurethane reinforcement adhesive film is proposed, whose reinforcement thickness gradually tapers as it enters the core material. This minimizes stress concentrations at the interface, preventing excessive adhesive squeeze-out during the bonding process, and improves the stiffness of the beam. Results indicate the proposed model avoids the formation of micro cracks, interlaminar delamination, buckling, and local deformations, and effectively improves the stiffness of the beam.

1. Introduction
2. Literature Survey
3. Viscoelastic Autoclave Bonding with TaperedEpoxy Reinforcement Polyurethane Films
    3.1. Viscoelastic autoclave spunbond interlayerbonding
    3.2. Tapered epoxy polyurethane reinforcementadhesives film
    3.3. Scientific hypothesis
4. Result and Discussion
    4.1. Experimental setup
    4.2. Performance metrics of the proposed model
    4.3. Comparison of proposed model with previousmodels
5. Conclusion
Limitation
Future Scope
References
Author Information

• Rajesh Lalsing Shirale(Applied Mechanics Department, Government College of Engineering, Chhatrapati Sambhajinagar 431005, India) Corresponding author
• Surekha Anil Bhalchandra(Applied Mechanics Department, Government College of Engineering, Chhatrapati Sambhajinagar 431005, India)