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$  LS-DYNA Aerospace Working Group QA Test Case 3                              $
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$  Rubber Projectile Impacting a Rigid Plate                                   $
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$  Reference:        http://awg.lstc.com                                       $
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$  Revision History:                                                           $
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Description:     Bird strike analysis using a rubber projectile with rate 
                 effects impacting a rigid plate. The rubber projectile is used
                 to represent the "bird material" and is modeled using 
                 *MAT_SIMPLIFIED_RUBBER (MAT_181). Gelatin rebounds elastically 
                 (until tension failure). Gelatin appears to soften at higher 
                 strain rates. These effects are included in the model. 
                 Two types of force vs. change in gauge length at different 
                 strain rates are tested. 

Status:          Accepted and currently part of the AEROQA Test Suite

Classification:  Example 

Keywords:        *CONTROL_BULK_VISCOSITY
	         *MAT_SIMPLIFIED_RUBBER
	         *DEFINE_TABLE
	         *DEFINE_CURV
                 ...

Units:	         in (length), s (time), lbf-s^2, psi (stress), lbf-in (energy) 

Model Data:	 approx. 2500 shells / 1 shell material (rigid), 
                 1500 solids / 1 solid material, 2 parts 

Run time:	 approx. total CPU time = 1 minutes 26 seconds
                 (Intel Xeon CPU E7- 8837 @ 2.67GHz / MPP / 2 cpu's)

