Abstract:
:Experimentally observed dissipated nonlinearity in Lamb wave propagation in composites due to stress-relaxation is reported herein. It was found that the stress relaxation in composite is inherently coupled with the second order nonlinear parameter derived from the Lamb wave modes. Due to the combined effect of internal stresses and damage accumulation in composites, the second harmonic frequency was found to be shifted towards the lower frequency with increasing amplitude, which was partially recovered and shifted back during the stress relaxation. A comprehensive fatigue experiment was conducted on ASTM standard composite specimens with fatigue loading sequences and relaxation, while the guided Lamb wave signals were collected using piezoelectric sensors integrated with the specimens. A remarkable ∼27% reduction of acoustic nonlinearity was observed during relaxation. Rate and degree of relaxation were found to be the function of number and frequency of loading cycles and inherently correlated with the remaining strength of the composites.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Patra S,Ahmed H,Saadatzi M,Banerjee Sdoi
10.1016/j.ultras.2019.01.002subject
Has Abstractpub_date
2019-07-01 00:00:00pages
224-231eissn
0041-624Xissn
1874-9968pii
S0041-624X(18)30702-9journal_volume
96pub_type
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