Download Preliminary Final Report Presentation Version 2.p+

James Cain
12/4/14
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Model a baseball and baseball bats in
Abaqus/CAE
Perform a dynamic analysis on the bat-ball
interaction in Abaqus/Explicit
Modify models with different physical
properties such as material, mass, and size,
and compare results
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Baseball consists of four different materials
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◦
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Cork
Rubber
Wool
Cowhide
Material Properties of a Baseball
Density (lb/in3)
.028
Short-Time Shear
Long-Time Shear
Modulus (psi)
Modulus (psi)
4498
1492
Decay Constant
Bulk Modulus (psi)
5025
13495
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Average baseball diameter is 2.90”
FEA model of a baseball
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Bat materials chosen are ash and aluminum
Material Properties of Ash
Density
Elastic Modulus (psi)
Shear Modulus (psi)
Poisson’s Ratio
(lb/in3)
E1
E2
E3
G12
G23
G13
ν12
ν23
ν13
0.028
2.02x106
1.93x105
2.13x105
1.78x105
2.03x104
1.20x105
0.4
0.5
0.5
Material Properties of Aluminum
Density (lb/in3)
Elastic Modulus (psi)
Poisson’s Ratio
0.0975
10x106
0.33
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Bat length, barrel diameter, and handle diameter
are same size for all three bats
◦ Length: 34”
◦ Barrel diameter: 2.5”
◦ Handle Diameter: 1.0”
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Ash bat is solid, whereas aluminum bat has solid
handle and hollow barrel with 0.1” thick wall
Bats are modified with different physical properties
FEA model of a baseball bat
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FEMs of baseball and bats created
Material properties assigned to models
◦ Baseball = Viscoelastic
◦ Wood bat = Orthotropic
◦ Aluminum bat = Elastic
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Assembly and steps created
Interactions and constraints applied to bat and
ball
Boundary conditions and predefined fields
defined
Bat and ball meshed with tetrahedral elements
Bat-Ball Interaction
Bat-Ball Interaction
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Performance of wood and aluminum bats was
investigated for different bat masses, bat swing
speeds, and ball impact locations
Aluminum bat outperformed wood bat in all
analysis when bats were similar in weight
◦ Attributed to smaller moment of inertia of hollow aluminum
bat and trampoline effect