On physical measures of rheological responses of some materials in wide ranges of temperature and spectral frequency

Pindera, J. T.; Straka, Peter

doi:10.1007/bf01521727

Cited by 34 publications

(3 citation statements)

References 11 publications

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“…9 The main scattered light sheet supplies basic information on the normal stress components in the form of a normal isodyne function with the light intensity minima of an integer order, ms. 9 The complementary light sheet supplies the same information as above; however, the light intensity minima are of an integer and half order, ms + 1/2. This increases the resolution of the recorded data.…”

Section: ~ [1 --Cos((~ R + A~r)]mentioning

confidence: 99%

Electronic techniques in isodyne stress analysis: Part 1. Basic relations

Pindera

Josepson

Javanović

1997

Experimental Mechanics

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ABSTRACT--The purpose of the study was to develop electronic techniques for collecting, processing and evaluating information in experimental isodyne stress analysis. The original technique involved chemical photography recording and manual evaluation of the normal and shear isodyne functions and their derivatives, which are proportional to the stress components. One objective of the reported study was to show that it is feasible to reliably reconstruct isodyne surfaces which contain information on the internal force intensities and the components of the stress tensor. It is shown that the new technique satisfies all the theoretical conditions and constraints imposed by the theory of the analytical and optical isodynes. Thus another objective of the reported study was to demonstrate that the isodyne stress analysis allows one to obtain reliable data on the actual three-dimensional stresses in a cost-effective manner. The procedure developed to date and presented in the paper is a hybrid electronic-manual procedure. It involves electronic recording of the isodyne fields, manual determination of the isodyne orders in chosen sections, and electronic determination of the indicated and loadinduced isodyne functions and of the isodyne surfaces. It is shown that the developed techniques are more reliable, accurate and cost-efficient than the traditional techniques of photomechanics. Pertinent data are illustrated by examples presented in Part 2.

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Section: ~ [1 --Cos((~ R + A~r)]mentioning

confidence: 99%

Electronic techniques in isodyne stress analysis: Part 1. Basic relations

Pindera

Josepson

Javanović

1997

Experimental Mechanics

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“…Not Testable: Metaphysical Theory ently coupled thermodynamic phenomena are negligible or not (5,(12)(13)(14)(15)(16)(17). On the other hand it has been shown that a more theoretical understanding of the responses of engineering materials allows to develop some practical engineering procedures (18,19).…”

Section: Three-dimensional S T R E S S a N A L Y S I S Of Composite Smentioning

confidence: 99%

“…It is convenient to describe the distribution of the stress-modulated scattered light intensities by using the concept of the lines of constant light intensity, related to the chosen characteristic directions x and Y : I,l,2/klo = I," = F s l , 2 (~, y ) = const. (16) where the subscripts 1, 2 denote light beams S1 and S 2 scattered under the azimuthal angles 0 and a/2, respectively, Fig. 8.…”

Section: Optical Isodynesmentioning

confidence: 99%

Three‐dimensional stress analysis of composite structures using isodyne techniques

Pindera

1989

Polymer Composites

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It is known that the stresses in lamination planes of composite structures are pronouncedly three‐dimensional, and that criticality of the lamination defects is often very high. It is also known that the classical methods of photoelastic stress analysis are often not reliable when stress states are three‐dimensional, with the exception of the gamma‐ray stress‐freezing method. The paper presents analytical and empirical evidence that the recently developed “isodyne” techniques allow reliable determination of the 3‐D stresses existing in components of real composite structures and in lamination planes.

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Patterns of Modern Experimental Mechanics

Pindera

Recent Advances in Experimental Mechanics

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On physical measures of rheological responses of some materials in wide ranges of temperature and spectral frequency

Cited by 34 publications

References 11 publications

Electronic techniques in isodyne stress analysis: Part 1. Basic relations

Electronic techniques in isodyne stress analysis: Part 1. Basic relations

Three‐dimensional stress analysis of composite structures using isodyne techniques

Patterns of Modern Experimental Mechanics

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