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A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials

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Progress and challenges in numerically modelling solid sports balls with application to softballs.

Lloyd V Smith¹, Joseph G Duris

¹School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington, USA. lvsmith@wsu.edu

Journal of Sports Sciences

|February 3, 2009

Summary

This summary is machine-generated.

A Power Law model accurately simulates bat-ball impacts, outperforming Prony series models. This research guides finite element model parameter tuning for better ball response characterization in sports simulations.

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Area of Science:

Sports Engineering
Materials Science
Computational Mechanics

Background:

Finite element simulation of bat-ball impacts often focuses on ball modeling.
Experimental characterization of ball response is challenging, limiting model accuracy.

Purpose of the Study:

To experimentally characterize a solid ball's dynamic response during impact.
To evaluate different material models for simulating bat-ball impacts using finite element analysis.
To provide guidance for parameter tuning in impact simulations.

Main Methods:

Dynamic mechanical analysis (DMA) and instrumented impact testing were used.
A linear viscoelastic material model was implemented in numerical simulations.
Prony series and Power Law models were compared against experimental data.

Main Results:

The Prony series model, based on small deformation DMA, underestimated energy loss.
The Power Law model, fitted to large deformation data, accurately predicted energy loss and impact forces across various speeds.
A parametric study offered insights into optimizing Power Law model parameters.

Conclusions:

The Power Law model is superior to the Prony series model for simulating bat-ball impacts.
Accurate ball response characterization requires testing under game-like conditions.
Further refinement of numerical models is needed for precise simulation of sports impacts.