Abstract：
:Acoustic wave interaction with non-bonded contacts was found to be inherently non-linear due to asymmetrical stiffness distribution across the interface. A diode-type non-linearity results in local static elastic fields inside the contact, which are shown to be a source of transient longitudinal and shear DC-acoustic pulses polarized oppositely to a biasing contact stress. A parametric modulation of contact stiffness leads to acoustic instability effects, multiple sub-harmonics, and amplitude "self-modulation", and provides chaotic noise-like non-linear acoustic excitations in solids. For realistic cracked flaws, contact acoustic non-linearity exhibits amplitude hysteresis and storage caused by acoustic wave impact on the defect. Maximum storage time observed comes to several hours for read-in time less than half a minute. A long-term non-linear memory is believed to be due to a slow relaxation of thermally induced micro-strain within the crack area.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Korshak BA,Solodov IY,Ballad EMdoi
10.1016/s0041-624x(02)00241-xsubject
Has Abstractpub_date
2002-05-01 00:00:00pages
707-13issue
1-8eissn
0041-624Xissn
1874-9968pii
S0041-624X(02)00241-Xjournal_volume
40pub_type
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