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Shear versus micro-shear bond strength test: a finite element stress analysis
Eliane Placido1, Josete B C Meira, Raul González Lima
1Department of Dental Materials, School of Dentistry, University of São Paulo, São Paulo, Brazil.
Summary
Finite element analysis revealed significant stress concentration differences between shear and micro-shear tests. Standardizing parameters like elastic modulus and load distance is crucial for reliable dental composite testing.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Computational Mechanics
Background:
- Dental adhesive bond strength testing is critical for material development.
- Shear and micro-shear tests are common methods, but their stress distributions are not fully understood.
- Finite element analysis (FEA) offers a powerful tool to investigate complex stress patterns.
Purpose of the Study:
- To compare stress distribution in shear versus micro-shear test configurations using FEA.
- To identify key parameters influencing stress concentration in these tests.
- To propose standardization for improved experimental reliability.
Main Methods:
- Two-dimensional plane strain FEA was conducted using MSCPatran and MSCMarc.
- Models simulated published shear and micro-shear test setups with isotropic, homogeneous, linear-elastic material properties.
- Analysis focused on maximum tensile and shear stresses and interfacial stress distribution under varying load conditions.
Main Results:
- Stress distribution was non-uniform and significantly differed between shear and micro-shear models.
- Pronounced stress concentration occurred at interfacial edges, with tensile stresses exceeding shear stresses.
- Micro-shear tests showed intensified stress with thicker adhesive layers and low-modulus composites.
Conclusions:
- Elastic modulus of composites, adhesive layer thickness, and load application distance significantly influence stress concentration.
- Standardization of these parameters is recommended for shear and micro-shear bond strength testing.
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