An Approximate Method for Calculating Elastic-Plastic Stress and Strain on Notched Specimens

Area of Science:

• Mechanical Engineering
• Materials Science
• Computational Mechanics

Background:

• Accurate prediction of elastic-plastic behavior in notched components under cyclic loading is crucial for structural integrity.
• Existing models may not fully capture the complexities of multiaxial stress states in notched regions.

Purpose of the Study:

• To develop and validate an approximate method for calculating surface elastic-plastic stresses and strains in notched samples.
• To assess the accuracy of the proposed method against experimental data under various multiaxial loading conditions.

Main Methods:

• Utilized the Abdel-Karim-Ohno cyclic plasticity model for stress-strain calculations.
• Employed plane stress conditions for the analysis.
• Conducted experimental tests on 2124-T851 aluminum alloy samples with two notch types.
• Measured surface strain distribution using digital image correlation (DIC).

Main Results:

• The approximate method demonstrated reasonably good agreement with experimental results.
• The method proved effective even for complex multiaxial axial-torsion load paths.
• Strain distributions predicted by the model closely matched DIC measurements.

Conclusions:

• The proposed approximate method provides a reliable tool for estimating elastic-plastic surface responses in notched components.
• This approach enhances the predictive capability for fatigue and failure analysis under complex loading scenarios.