S0404-1-3 アルミニウム小球の衝撃接合(衝撃問題の新たなる展開と応用(1))

概要

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A small aluminum sphere with a diameter of 4.75 mm was impact-welded to aluminum, copper and stainless steel targets by the helium gas gun. The impact simulation of an aluminum sphere against aluminum and rigid targets was also performed using LS-DYNA. The aluminum sphere can be welded to a target at an impact velocity more than about 340 m/s regardless of the difference of the target material. The deformed morphology is strongly dependent on the mechanical properties of the target material. Since the temperature increment at the boundary of a sphere and aluminum target estimated using the strain energy calculated by the numerical analysis is lower than the melting one, it is deduced that the bonding of a sphere to the aluminum target is dependent on the temperature elevation induced by friction force between two boundaries.
2009-09-12