Accession Number : ADA230938

Title :   Sinusoidal Response of a Thin Viscoplastic Plate with Severe Temperature Gradient.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Fischer, Kenneth J.

Report Date : NOV 1990

Pagination or Media Count : 67

Abstract : A mathematical model for the sinusoidal vibratory response of a thin plate subjected to a through the thickness temperature gradient is developed. An 85% copper/15% niobium composite plate was modeled using a temperature and frequency dependent model of the modulus. This modulus is based on a time dependent stress-strain constitutive relationship incorporating fractional calculus. Calculations were performed in the Laplace domain which facilitates straightforward manipulation of terms and equations. The resulting formulation accounts for the change in stiffness and damping characteristics through the thickness caused by viscoplastic effects due to the temperature gradient.

Descriptors :   DAMPING, EQUATIONS, FORMULATIONS, FREQUENCY, HIGH RATE, INTENSITY, LAPLACE TRANSFORMATION, MATHEMATICAL MODELS, MODELS, STIFFNESS, STRESS STRAIN RELATIONS, TEMPERATURE GRADIENTS, THICKNESS, TIME DEPENDENCE.

Subject Categories : Mechanics
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE