Rapid Fatigue Life Projection for Thermal and Acoustic Loads

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: F33615-02-M-3244
Agency Tracking Number: 021VA-2306
Amount: $99,177.00
Phase: Phase I
Program: SBIR
Awards Year: 2002
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Zona Technology, Inc.
7430 E. Stetson Drive, Suite 205, Scottsdale, AZ, 85251
DUNS: 182103291
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 P.C. Chen
 Vice President
 (480) 945-9988
 pc@zonatech.com
Business Contact
 Danny Liu
Title: President
Phone: (480) 945-9988
Email: danny@zonatech.com
Research Institution
N/A
Abstract
"The focus of the proposed effort is on the prediction of the fatigue life of composite panels subjected to thermal effects, inducing buckling, and a strong acoustic excitation which may force the panel to "jump" from one buckled configuration to another.The fatigue life will be estimated through the modeling of the probability density function of stress ranges from which the fatigue life is readily obtained. The proposed model is an extension of Dirlik's formula that also accounts for the nonlinearity ofthe panel dynamics as well as the nonlinearity of the corresponding displacements-stresses relation. The proposed model which is theoretically justified will be validated/fine-tuned on an extensive database of stress time histories corresponding to 4different structural models exhibiting a variety of spectral features, i.e. one or several peaks, one or several dominant peaks, close frequencies, etc., subjected to 4 different thermal loading scenarios, at various sound pressure levels, and with severaldifferent angle of incidence. The determination of the parameters of the model from either experimental time histories of the stresses or a finite element model of the panel will also be addressed. Although the proposed work addresses specifically thefatigue life of panels subjected to thermoacoustic effects, it is expected that the modified Dirlik formula would be applicable to a broad range of nonlinear vibration problems. ZONA Technolo

* information listed above is at the time of submission.

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