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Influence of Interface Inclination Angle and Connection Method on the Failure Mechanisms of CFRP Joints
Junhan Li1, Afang Jin1, Wenya Ruan1
1College of Mechanical Engineering, Xinjiang University, Ürümqi 830047, China.
Polymers
|February 13, 2026
Summary
Optimizing carbon fiber reinforced polymer (CFRP) joints involves understanding how interface angles and hybrid bonding-bolting methods enhance load capacity. These findings improve designs for aerospace and wind turbines.
Area of Science:
- Materials Science
- Mechanical Engineering
- Structural Analysis
Background:
- Carbon fiber reinforced polymers (CFRPs) are crucial in aerospace and wind energy.
- Complex failure mechanisms in CFRP joints hinder optimal connection design.
Purpose of the Study:
- Investigate how bonding interface inclination and connection methods affect CFRP joint failure under bending.
- Analyze the influence of joint geometry and connection type on mechanical performance and failure modes.
Main Methods:
- Utilized finite element simulations to analyze mechanical performance and failure modes.
- Conducted bending tests to validate numerical simulations and assess joint interface properties.
- Examined joint geometries (single-slope, transition-slope, single-step) and connection methods (bonding, bolting, hybrid).
Main Results:
- Bonded connections showed increased bending load with interface slope (21.87% and 39.75% improvements) due to reduced stress concentration.
- Hybrid bonding-bolting connections achieved the highest peak load (38.38% and 43.91% improvements).
- Hybrid connections enhanced structural performance and damage tolerance.
Conclusions:
- Interface geometry and connection method significantly influence CFRP joint failure mechanisms.
- Hybrid bonding-bolting offers superior structural performance and damage tolerance for CFRP joints.
- Provides a reliable prediction method for CFRP joint behavior in critical applications.
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