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Large deformation analysis of a backside-supported snap-fit with nonlinear behavior
Siham El Otmani1, Dong-Kil Shin1
1School of Mechanical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk, 38541, Republic of Korea.
Heliyon
|September 8, 2023
Summary
This study analyzed backside-supported snap-fits, finding that supporting bar stiffness and reduced stress concentration improve design. Numerical and experimental methods confirmed these findings for snap-fit performance.
Area of Science:
- Mechanical Engineering
- Materials Science
- Design Engineering
Background:
- Snap-fits are common mechanical fasteners, but their performance under large deformation, particularly backside-supported types, requires detailed analysis.
- The supporting bar in backside snap-fits is critical for assembly/disassembly and experiences significant nonlinear behavior.
Purpose of the Study:
- To analyze the large deformation of backside-supported snap-fits.
- To investigate the role of the supporting bar's reaction force and its deformation characteristics.
- To identify design improvements for enhanced snap-fit performance.
Main Methods:
- Finite element analysis (FEA) was employed to model snap-fit behavior.
- Three specimen designs were fabricated for experimental verification.
- Load-displacement data was collected using a testing machine to measure reaction forces.
Main Results:
- Stress concentration was identified at the supporting bar root and base part's bent edge.
- The supporting bar exhibited large deformation, involving nonlinear elasticity and plastic damage.
- Load-displacement curves showed highly nonlinear behavior, including a peak load before plastic damage initiated.
Conclusions:
- Snap-fit design can be optimized by minimizing stress concentration points.
- Increasing the stiffness of the supporting bar enhances snap-fit functionality.
- Integrated numerical and experimental approaches provide robust design validation.
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