Optimization techniques for contact stress analysis.
Loading...
Authors
McDonald, Eric S.
Subjects
contact stress
optimization
optimization
Advisors
Kwon, Young W.
Date of Issue
1992-12
Date
December 1992
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The analysis of stresses induced by contact between two bodies is inherently difficult
because the size of the contact zone is unknown and constantly changing throughout
loading. To overcome these difficulties, two approximation methods have been developed
to determine the magnitude of contact stresses using the Rayleigh-Ritz method and
the finite element method. Numerical optimization methods are employed to solve the
contact problem. The solution techniques are compared to known analytical solutions
and shown to yield accurate results. An application of this approach to solving the
contact problem is illustrated by examining the response of a clamped sandwich composite
beam to low velocity impact. It was found that the maximum shear stress is insensitive
to lamina thickness, however an increase in the contact layer thickness resulted
in a reduction in interfacial shear stress. In addition, it was noted that a nonlinear
bending stress distribution in the contact layer intensified as the thickness of this layer
increased. This phenomenon was found to be localized to the region of contact. Finally,
it was found that the compressive transverse normal stresses increased as the thickness
of the contact lamina increased.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funding
Format
81 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.