The dynamic characteristics of composite thin-walled structures are affected directly by high-intensity acoustic loadings in an elevated temperature.The thermal stresses caused by the thermal loadings can result in the thermal buckling, while the acoustic loadings can make structures vibrate in complicated motion forms.To get the nonlinear response of thin-walled structures to thermal-acoustic loadings, the simply supported rectangular composite plate model with different combinations of temperatures and SPLs is utilized.Then the PSD characteristics with temperatures and SPLs are analyzed and the RMS under different SPLs are compared to obtain the nonlinear characteristics of composite materials with thermal-acoustic loadings.The results show that the responses of composite thin-walled structures to the thermo-acoustic loadings are obviously nonlinear, and the nature frequencies in both pre-/post bucklings are apparently different in the PSD.The structural stiffness reduced, then increased before and after the snap-through motion, resulting in the hardening phenomenon.
BAO Dong-dong, SHA Yun-dong, WEI Jing
. Nonlinear response of composite plate subject to thermo-acoustic loadings[J]. Journal of Shenyang Aerospace University, 2013
, 30(5)
: 5
-9
.
DOI: 10.3969/j.issn.2095-1248.2013.05.002
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