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Modeling deformation behavior of the baseball.

Rochelle Llewelyn Nicholls1, Karol Miller, Bruce C Elliott

  • 1School of Mechanical Engineering, The University of Western Australia, Perth.

Journal of Applied Biomechanics
|September 1, 2005
PubMed
Summary
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This study models baseball impact response to control exit velocity, aiming to reduce injuries and maintain game balance. The developed model accurately predicts ball behavior, forming a basis for future research.

Area of Science:

  • Sports Engineering
  • Materials Science
  • Biomechanics

Background:

  • Regulating baseball exit velocity is crucial for player safety and competitive balance.
  • Understanding the physics of ball-impact response is key to developing effective control strategies.

Purpose of the Study:

  • To develop and validate a computational model for predicting baseball velocity-dependent behavior during impact.
  • To provide a basis for future research into baseball-bat impact dynamics.

Main Methods:

  • Quasi-static compression tests were performed on 70 baseballs to gather force-displacement data.
  • Implicit finite element analysis (FEA) was used to characterize material properties with a Mooney-Rivlin model.
  • Explicit FEA with a linear viscoelastic material model was employed to simulate transient impact behavior.

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Main Results:

  • The Mooney-Rivlin model showed excellent agreement with experimental data for both stiff and soft baseball models.
  • The linear viscoelastic model accurately predicted the time-dependent response, including instantaneous shear modulus and decay.
  • Model predictions for the coefficient of restitution aligned well with published experimental data across various velocities.

Conclusions:

  • The developed FEA model effectively captures the velocity-dependent behavior of baseballs during impact.
  • The model provides a robust framework for further investigation into the complex dynamics of baseball-bat interactions.
  • This research contributes to understanding impact mechanics for potential rule adjustments or equipment design.