Bonding Strength Characteristics of FRP Cylindrical Composites under Hygrothermal Loading

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Year : 2026 | Volume : 14 | 03 | Page :
    By

    kunal Pradhan,

  • T. Malyadri,

  • Srinivasa Gupta,

  1. M. Tech Student, Department of Mechanical Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, Telangana, India
  2. Assistant Professor, Department of Mechanical Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, Telangana, India
  3. Professor, Department of Mechanical Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, Telangana, India

Abstract

This study investigates the bonding strength characteristics and stress distribution patterns in fiber-reinforced polymer (FRP) cylindrical composites subjected to hygrothermal loading conditions. A four-phase cylindrical model incorporating AS-Graphite and S-Glass fibers with low modulus epoxy coating was analyzed under four distinct pressure loading conditions (25.984, 38.976, 77.953, and 155.906 MPa). Comprehensive stress analysis revealed significant variations in von-Mises stress, maximum principal stress, and minimum principal stress across fiber, coating, matrix, and composite phases. AS-Graphite composites exhibited superior stress resistance, with maximum von-Mises stress of 148.86 MPa at the highest loading, representing 50.7% lower stress magnitude compared to S-Glass composites (302.05 MPa) under identical conditions. The low modulus coating layer demonstrated critical stress mitigation functionality, reducing interfacial stress concentrations by 47-52% at fiber-coating boundaries. Stress concentration mechanisms were predominantly governed by elastic modulus mismatch and hygrothermal expansion coefficient differentials between constituent phases. Results indicate that coating layer effectiveness and fiber type selection are paramount design considerations for hygrothermal environments, with AS-Graphite systems providing enhanced structural integrity and bonding performance.

Keywords: FRP composites, hygrothermal loading, bonding strength, stress distribution, AS-Graphite fiber, S-Glass fiber, interfacial mechanics.

How to cite this article:
kunal Pradhan, T. Malyadri, Srinivasa Gupta. Bonding Strength Characteristics of FRP Cylindrical Composites under Hygrothermal Loading. Journal of Polymer & Composites. 2026; 14(03):-.
How to cite this URL:
kunal Pradhan, T. Malyadri, Srinivasa Gupta. Bonding Strength Characteristics of FRP Cylindrical Composites under Hygrothermal Loading. Journal of Polymer & Composites. 2026; 14(03):-. Available from: https://journals.stmjournals.com/jopc/article=2026/view=247124


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Ahead of Print Subscription Original Research
Volume 14
03
Received 12/05/2026
Accepted 10/06/2026
Published 20/06/2026
Publication Time 39 Days
16

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