US 12,269,131 B1
Nonlinear bulk modulus material
Thomas J Gieseke, Dighton, MA (US)
Assigned to The United States of America as represented by the Secretary of the Navy
Filed by The United States of America as represented by the Secretary of the Navy, Newport, RI (US)
Filed on Jan. 12, 2022, as Appl. No. 17/573,733.
Int. Cl. B23K 9/028 (2006.01); B21D 41/04 (2006.01); B23P 23/04 (2006.01)
CPC B23K 9/0282 (2013.01) [B21D 41/04 (2013.01); B23P 23/04 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A particle having a bulk modulus that varies nonlinearly with changes in pressure, said particle comprising:
a solid elastic shell having a tube shape with a closure at both ends and a wall with a circumferentially varying thickness defined by an inner surface and an outer surface; and
a core as an entirety of a closed volume defined by the inner surface of said shell, with said core having a bulk modulus less than the bulk modulus of said shell.