What does this research mean for the field?

Double-shear bolted joints in CFRP laminates exhibit higher ultimate load and failure displacement than single-lap joints, with mechanical properties showing a non-monotonic dependence on bolt size that peaks at different sizes depending on the joint configuration. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To systematically evaluate the coupled effects of joint configuration and bolt diameter on the load-bearing behavior, stiffness, and damage evolution of open-hole CFRP bolted assemblies.

September 2, 2026Journal of Composite Materials

Influence of joint configuration and bolt size on the load-bearing capacity and failure mechanisms of CFRP bolted joints

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Authors

YJYiwen Jiang XGXuehui Gan YZYichi Zhang

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Overview

Experimental and finite element analysis demonstrates distinct failure transitions and optimal bolt sizes in CFRP bolted joints, highlighting the structural advantages of double-shear configurations.

Key Points

To systematically evaluate the coupled effects of joint configuration and bolt diameter on the load-bearing behavior, stiffness, and damage evolution of open-hole CFRP bolted assemblies.
Tested single-lap and double-shear CFRP bolted joint configurations across a series of bolt diameters, including M3, M5, and M6.
Performed quasi-static tensile mechanical testing combined with nonlinear finite element modeling to extract load-displacement metrics and map internal failure mechanisms.
Double-shear joints achieved higher ultimate loads and failure displacements than single-lap joints, altering the M3 joint failure mechanism from brittle bolt fracture to bolt bending with fiber extrusion.
Joint mechanical performance displayed a non-monotonic response to bolt diameter, with ultimate load peaking at M6 in single-lap joints and at M5 in double-shear joints.
Matrix damage represented the dominant failure mode in all specimens, with the damage initiation zone shifting from the hole edge toward laminate edges as bolt size expanded.

Cite This Study

Jiang et al. (2026) studied this question.

synapsesocial.com/papers/6a97e305c562ede874ec79e2 https://doi.org/10.1177/00219983261485513

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September 2, 2026Journal of Composite Materials

Influence of joint configuration and bolt size on the load-bearing capacity and failure mechanisms of CFRP bolted joints

View Full Paper

Ask AI

Bookmark

Authors

YJYiwen Jiang XGXuehui Gan YZYichi Zhang

Discussion

Member takes

Overview

Experimental and finite element analysis demonstrates distinct failure transitions and optimal bolt sizes in CFRP bolted joints, highlighting the structural advantages of double-shear configurations.

Key Points

To systematically evaluate the coupled effects of joint configuration and bolt diameter on the load-bearing behavior, stiffness, and damage evolution of open-hole CFRP bolted assemblies.
Tested single-lap and double-shear CFRP bolted joint configurations across a series of bolt diameters, including M3, M5, and M6.
Performed quasi-static tensile mechanical testing combined with nonlinear finite element modeling to extract load-displacement metrics and map internal failure mechanisms.
Double-shear joints achieved higher ultimate loads and failure displacements than single-lap joints, altering the M3 joint failure mechanism from brittle bolt fracture to bolt bending with fiber extrusion.
Joint mechanical performance displayed a non-monotonic response to bolt diameter, with ultimate load peaking at M6 in single-lap joints and at M5 in double-shear joints.
Matrix damage represented the dominant failure mode in all specimens, with the damage initiation zone shifting from the hole edge toward laminate edges as bolt size expanded.

Cite This Study

Jiang et al. (2026) studied this question.

synapsesocial.com/papers/6a97e305c562ede874ec79e2 https://doi.org/10.1177/00219983261485513

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