NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Computational simulation of acoustic fatigue for hot composite structuresThis paper presents predictive methods/codes for computational simulation of acoustic fatigue resistance of hot composite structures subjected to acoustic excitation emanating from an adjacent vibrating component. Select codes developed over the past two decades at the NASA Lewis Research Center are used. The codes include computation of (1) acoustic noise generated from a vibrating component, (2) degradation in material properties of the composite laminate at use temperature, (3) dynamic response of acoustically excited hot multilayered composite structure, (4) degradation in the first-ply strength of the excited structure due to acoustic loading, and (5) acoustic fatigue resistance of the excited structure, including propulsion environment. Effects of the laminate lay-up and environment on the acoustic fatigue life are evaluated. The results show that, by keeping the angled plies on the outer surface of the laminate, a substantial increase in the acoustic fatigue life is obtained. The effect of environment (temperature and moisure) is to relieve the residual stresses leading to an increase in the acoustic fatigue life of the excited panel.
Document ID
19910047476
Document Type
Conference Paper
Authors
Singhal, S. N. (Sverdrup Technology, Inc. Brook Park, OH, United States)
Nagpal, V. K. (Sverdrup Technology, Inc. Brook Park, OH, United States)
Murthy, P. L. N. (Sverdrup Technology, Inc. Brook Park, OH, United States)
Chamis, C. C. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1991
Subject Category
STRUCTURAL MECHANICS
Report/Patent Number
AIAA PAPER 91-1178
Meeting Information
AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference(Baltimore, MD)
Distribution Limits
Public
Copyright
Other