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Bending of Members Made of Several Materials

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Related Experiment Video

Updated: May 10, 2025

Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel

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Published on: August 13, 2019

Optimization of Hybrid Composite-Metal Joints: Single Pin.

Ruopu Bian^1,2, Bin Wang², Hongying Yang¹

¹College of Intelligent Textile and Fabric Electronics, Zhongyuan University of Technology, Zhengzhou 450007, China.

Materials (Basel, Switzerland)

|April 24, 2025

Summary

Optimizing additive manufactured rivet pins for aerospace joints significantly reduces stress concentration. The ideal single pin design, with a 60° angle and 3.43 mm height, minimizes mechanical stress for improved performance.

Keywords:

finite element analysis metal to composite joints optimization pin joint stress

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Area of Science:

Aerospace Engineering
Materials Science
Mechanical Engineering

Background:

Aerospace industry operational expenditures can be reduced by improving composite and metal joint methodologies.
Additive manufacturing of rivet pins presents an innovative joining technique for aerospace applications.

Purpose of the Study:

To analyze the mechanical strength of joints with additive manufactured rivet pins.
To optimize pin profiles by studying the impact of geometry on joint performance and minimizing stress concentration.

Main Methods:

Finite element analysis (FEA) and lap shear testing were used to examine metal-to-composite joint configurations.
Numerical simulations were performed to identify stress locations and guide pin profile optimization.
Additive manufacturing was employed to produce optimized pin designs for experimental validation.

Main Results:

Maximum shear stress in the pin was found at the junction between the pin base and the metal plate.
Optimizing pin shape and dimensions significantly mitigated both shear and axial stresses.
The optimal single pin configuration (60° angle, 3.43 mm height) achieved minimum shear stress, aligning with simulation results.

Conclusions:

The study validates the effectiveness of numerical optimization and additive manufacturing for improving rivet pin designs.
The optimal single pin design demonstrates reduced stress concentration, paving the way for more efficient aerospace joints.
Further research will focus on multi-pin configurations based on the successful single-pin optimization.