Journal ArticleDOI
Determining reliable edge isopachic data from interior thermoelastic measurements
B. J. Rauch,Robert E. Rowlands +1 more
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TLDR
In this paper, an iterative least squares method for calculating reliable edge isopachic stresses from measured interior values is proposed, which is based upon the plane-stress isotropic compatibility equation.Abstract:
The maximum stresses in a plane-stressed component typically occur on the boundary. However, it is generally difficult to obtain reliable experimental data at an edge and thermoelastic stress analysis is no exception. The inability to measure reliable edge isopachic stresses has caused many previous thermoelastic stress analyses to be more qualitative than quantitative. This paper develops and implements an effective iterative least-squares method for calculating reliable edge isopachic stresses from measured interior values. The method is based upon the plane-stress isotropic compatibility equation. A regularization scheme is employed to minimize the sensitivity to measurement error and to improve the stability of the algorithm by controlling the rate of convergence. An illustrative example with actual measured thermoelastic data is included. The processes thermoelastically determined results compare well with those obtained using strain gages.read more
Citations
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Book ChapterDOI
Thermoelastic Stress Analysis
TL;DR: In this article, the theoretical foundations for the experimental technique of thermoelastic stress analysis are presented, followed by a description of the equipment, test materials, and methods required to perform an analysis.
Journal ArticleDOI
Separating Stresses Thermoelastically in a Central Circularly Perforated Plate Using an Airy Stress Function
TL;DR: In this paper, the authors proposed an inverse technique to evaluate individual stresses reliably in a uniaxially loaded finite plate with a central circular hole from TSA-recorded information without supplementary experimental data.
Journal ArticleDOI
Image enhancement and stress separation of thermoelastically measured data under random loading
TL;DR: In this paper, the authors employ an alternative signal analysis technique that enables one to evaluate the magnitude of the individual components of stress in a component subjected to a loading that is random in both frequency and magnitude.
Journal ArticleDOI
An Integrated Approach to the Separation of Principal Surface Stresses Using Combined Thermo-Photo-Elasticity
TL;DR: In this paper, the authors presented an instrument capable of the full-field separation of principal stresses on the surface of a component by combining the techniques of thermo-photo-elastic analysis and reflection photoelasticity in a single optical head.
Journal ArticleDOI
Hybrid Stress Analysis of Perforated Composites Using Strain Gages
T. H. Baek,Robert E. Rowlands +1 more
TL;DR: In this article, a strain gage hybrid method is described for determining individual stresses on the boundary and in the neighborhood of cutouts in orthotropic composites, where few measured strain data are needed, and the measured strains originate away from the hole.
References
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Book
Concepts and Applications of Finite Element Analysis
TL;DR: In this article, the authors present a formal notation for one-dimensional elements in structural dynamics and vibrational properties of a structural system, including the following: 1. Isoparametric Elements.
Book
Thermoelastic stress analysis
N. Harwood,W. M. Cummings +1 more
TL;DR: Harwood et al. as discussed by the authors introduced the concept of thermo-elastic stress analysis and applied it to fracture mechanics, P.Stanley variable-amplitude loading, N.T.Potter post-processing of SPATE data, J.K.McKelvie and A.Cummings the thermoelastic effect -a higher order consideration, A.G.Beghi TSA signal processing and data collection.
Journal ArticleDOI
Concepts and Applications of Finite Element Analysis (2nd Edition)
R. D. Cook,H. Saunders +1 more