Damping device for use with acoustic information generation machines

Claim 1

An improved testing device for stressing a test member producing acoustic information from the test member relating to changes occurring in the test member due to the stressing of the test member, of the type having at least one stress for contacting the test member and applying a stress thereto, the improvement comprising: a metal isolation piece comprising a shape-memory alloy (an alloy having the capacity to regain its shape upon heating after deformation) disposed along the stress member so that acoustic emissions transmitted through said stress member must encounter said metal isolation piece, said metal isolation piece having resistance to deformation, wherein said metal isolation piece is disposed for contacting the test member and applying a stress thereto, wherein said metal isolation piece comprises a roller mounted on the end of the stress member, wherein said metal isolation piece consist essentially of an austenitic phase of said shape-memory alloy, and wherein said testing device further includes at least two other stress members disposed for contacting the test member and opposing the stress applied by at least one stress member so that a binding force can be applied to the test member; each of at least two other stress members having mounted on the end thereof a roller for contacting the test member, said roller consisting essentially of an austenitic phase of a shape-memory alloy.