Young's Modulus Calculus Using Split Hopkinson Bar Tests on Long and Thin Material Samples

Area of Science:

• Materials Science
• Mechanical Engineering
• Solid Mechanics

Background:

• Young's modulus is crucial for material characterization.
• Split Hopkinson Pressure Bar (SHPB) tests are standard for dynamic material properties.
• Accurate calculation of elastic modulus from SHPB data can be challenging due to signal oscillations.

Purpose of the Study:

• To develop an improved method for calculating Young's modulus from compression SHPB tests.
• To address the challenges posed by signal oscillations in determining the elastic modulus.
• To utilize Finite Element Method (FEM) simulations for calculating the Poisson coefficient.

Main Methods:

• Utilizing long and thin specimens in compression SHPB tests to generate multistep transmission signals.
• Analyzing the ratio of successive step heights in the transmission signal.
• Employing a fine-tuning method based on signal rise time to overcome oscillatory interference.
• Applying Finite Element Method (FEM) simulations for Poisson coefficient determination.

Main Results:

• A refined method for calculating Young's modulus from SHPB tests is presented.
• The proposed fine-tuning approach enhances the precision of elastic modulus determination.
• FEM simulations provide a means to calculate the Poisson coefficient for complex alloys.

Conclusions:

• The developed method offers a more accurate determination of Young's modulus in SHPB testing.
• The fine-tuning technique effectively mitigates the impact of signal oscillations.
• This research contributes to more reliable dynamic material property characterization.