Dynamic Explicit Analysis of Rubber Ball Hitting Concrete Wall Begum Derebay
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Transcript of Dynamic Explicit Analysis of Rubber Ball Hitting Concrete Wall Begum Derebay
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Istanbul Technical University
Faculty of Mechanical Engineering
Solid Mechanics Department
Istanbul Technical University
The Faculty of Mechanical Engineering
PROJECT
DYNAMIC EXPLICIT ANALYSIS OF RUBBER BALL HITTING CONCRETE WALL
MAK 525E Finite Element Methods
Submitted by : Begüm Derebay 503101511
Submitted to : Prof. Dr. Ata Muğan / Dr. Emin Sünbüloğlu
Due to :24-May-2011
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INFORMATION ABOUT ANALYSIS BEFORE THE RESULTS
Two parts are generated for this analysis.
1. Concrete wall
2. Rubber ball
Material properties entered as below:
1. Concrete
Density : 0.14
Young’s Modulus: 170000
Poisson’s Ratio: 0.3
2. Rubber
Density: 0.0001
Hyperelastic material property was selected and below values were entered as data:
Polynomial
Coefficients:
C10: 500 C01: 100 D: 0.0001
Rubber material was assigned to BallSection (Type: Shell / Continuum Shell, Homogeneous)
Shell thickness: 1
Concrete material was assigned to WallSection. (Type: Solid, Homogeneous)
BallSection assigned to the part named Rubber Ball and ConcreteSection assigned to the part named
Concrete Wall as well.
After assembly process, in the Initial Step, boundary condition for concrete wall was given for the
bottom surface fixed as Encastre. Velocity is given for the rubber ball as V1: 800, V2= 800, V3= -1200.
In the Dynamic Step Field Output Request for the whole model domain, and a frequency of every 3E-
005 units of time, output variables were selected. History Output Request 1 is created for interaction
domain and History Output Request 2 for the whole model domain.
Interaction was created as Dynamic, between outer surface of the rubber ball and front surface of
the concrete wall. Kinematic contact method was chosen for the analysis.
Interaction property option is setted to Tangential Behavior and Frictionless.
With a approximate global size of 0.8 concrete wall was meshed.
With a approximate global size of 0.3 rubber ball was meshed.
Result of the analysis is as below:
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Undeformed:
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First Analysis Deformed
Stress Distribution
Contours on undeformed shape
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External work for the whole model:
Strain energy for the whole model
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Total area in contact
Contact pressure distribution
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Contact shear distribution
Strain components at integration points (Kinematic Strain)
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LE11
LE22
LE33
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Reaction forces
Stress
S11
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S22
S33
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If mesh size is changed (Rubber Ball seed size cahnged to 0.1):
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CPRESS
LE13
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INTERNAL ENERGY
KINETIC ENERGY
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STRAIN ENERGY
EXTERNAL WORK