Assembly of Thermoplastic Composites in the Single Strap Joint Configuration Subjected to Tensile Loading

Key findings from this study

• The study found that fusion bonded single strap joints manufactured from carbon fiber reinforced thermoplastic composites attained average maximum loads of approximately 5 kN under tensile loading.
• The researchers report that joint failures initiated in the clearance region and progressed toward strap edges.
• The authors demonstrate that finite element simulations produced predictions consistent with experimental results.

Overview

Carbon fiber reinforced thermoplastic composite single strap joints (SSJs) were manufactured using co-cured bonding technique and evaluated under tensile loading. The SSJ configuration represents a practical repair approach for thermoplastic composites. Joints measured 30 mm in strap length and were subjected to mechanical testing to assess structural performance.

Methods and approach

The researchers fabricated adherends and straps from carbon fiber reinforced thermoplastic prepregs. Co-curing simultaneously implemented the bonding process between components. Tensile testing characterized the mechanical behavior of 30 mm strap length joints. Finite element simulation studies provided computational validation of experimental observations.

Results

Fusion bonded joints attained average maximum loads of approximately 5 kN. Initial failure originated in the clearance region and propagated toward strap edges. Simulation predictions aligned with measured experimental outcomes, confirming the numerical model's accuracy.

Implications

The study demonstrates that thermoplastic composite single strap joints achieve reasonable load-carrying capacity under tensile conditions, with failures initiating at identifiable stress concentration regions. The clearance region emerges as a critical zone requiring attention during joint design and optimization. Understanding failure initiation patterns enables refinement of joint geometry and material selection to enhance repair durability.

Co-cured bonding represents an efficient manufacturing approach for thermoplastic composite joints, eliminating separate adhesive application steps. The agreement between simulation and experimental results validates numerical methods for predicting joint performance without extensive physical testing. This capability supports rapid prototyping and optimization of repair configurations in thermoplastic composite structures.

The limited scope of existing literature on thermoplastic composite single strap joints supports continued investigation into this repair methodology. Systematic characterization of joints with varying strap lengths, adherend thicknesses, and fiber orientations would establish design guidelines. Integration of manufacturing parameters and failure mechanisms strengthens the technological foundation for thermoplastic composite repair applications.

Scope and limitations

This summary is based on the study abstract and available metadata. It does not include a full analysis of the complete paper, supplementary materials, or underlying datasets unless explicitly stated. Findings should be interpreted in the context of the original publication.