Transcript Preliminary Final Report Presentation.pptx

James Cain
11/28/14
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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
◦
◦
◦
◦
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