Ultra High-Speed Impact Simulated with FEM (Part 2)
Appendix: Influeuce of the shape of point of the bullet and material properties
This page has opened to public since 20 September 2006.
Ultra High-Speed Impact Simulated with FEM (Part 2)
Appendix: Influeuce of the shape of point of the bullet and material properties
This page has opened to public since 20 September 2006.
Japanese
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All Rights Reserved by Dr. SHINOZUKA Jun.
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The situation of damage due to an impact stringly depends on an impact speed (high spped and ultra high-speed), the shape of a projectile and a target (the shape of the impacted surface) and each material property.
This page shows some examples simulated of the influence of a shape of impacted surface, an impact speed and the material properties upon the damaged shape.
Influences of the shape of the projectile
The shape of the nose of a projectile is flat. The projectile is long in length.
The shape of the nose of a projectile is streamlined type. The projectile is long in length.
The shape of the nose of a projectile is flat. The projectile is short in length.
The shape of the nose of a projectile is streamlined type. The projectile is short in length.
This case imitates a offset collision.
Influence of Impact Speed
for relatively low impact speed
In case of the impact speed is relatively low-speed.
In case of the impact speed is relatively high-speed.
As described, impact stresses depend on the flow stress characteristic and impact speed. If the yield stress could be a constant value, large deformation could occur when the impact speed is a high-speed. Or, if the impact speed is a constant value, large deformation occurs when the yiled stress is a small value. But large defoamrion hardly occur when the yield stress is a high value. A scall of the deformation depends on the both impact speed and material properties of the bullet and target.
Influence of Rod Length (Buckling)
for relatively low impact speed
These figures are the some of results changing the shape of bullet and material properties of bullet and target. Left hand side figures show the effective stress in GPa, while right hand side figures show the temperatures in K.
These results were simulated with the FEM software "RDynFem" that has been developed by Dr. SHINOZUKA Jun.
