Stress separation of thermoelastically measured isopachics

Rauch, B. J.; Rowlands, R. E.

doi:10.1007/bf02323930

Cited by 9 publications

(7 citation statements)

References 18 publications

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“…References [23] to [25] discuss the careful numerical considerations needed, the importance of filtering the measured TSA data, and a variety of means of conducting the forward process to determine the individual stresses away from the edges [28]. Based on FEM-type concepts, reference [29] formulated an effective method for separating TSA data into individual stresses (Fig. 9).…”

Section: Using Numerical Methodsmentioning

confidence: 99%

“…Reference [36] describes an instrument that allows the simultaneous collection of the PSA and TSA data from a common optical path using a beam splitter to divide the visible and infrared light, and reference [39] applied this approach to industrial components Fig. 9 Normalized stresses along a vertical line in a horizontal aluminium beam subjected to threepoint bending [29] with some success. Representing stresses associated with each of the measured TSA and PSA data as derivatives of a stress function could potentially improve the quality of the TSA-PSA-evaluated principal stresses of Fig.…”

Section: Hybrid Experimental Methodsmentioning

confidence: 99%

“…Based on FEM-type concepts, reference [29] formulated an effective method for separating TSA data into individual stresses (Fig. 9).…”

Section: Using Numerical Methodsmentioning

confidence: 99%

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Determining individual stresses thermoelastically

Patterson

Rowlands

2008

The Journal of Strain Analysis for Engineering Design

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Thermoelastic stress analysis (TSA, thermoelasticity) uses an infrared radiometer to measure local temperature fluctuations and relates these changes to variations in the stresses or strains in a material by thermodynamic principles. The recorded TSA signal is associated with a combination of the individual stress components. However, engineering analyses typically necessitate knowing the values of the individual stress components, and so it is necessary to 'separate the stresses'. The various approaches that have been used to evaluate the individual components of stress from the TSA-measured information are reviewed and compared, and some areas potentially worthy of further research are indicated.

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Section: Using Numerical Methodsmentioning

confidence: 99%

Section: Hybrid Experimental Methodsmentioning

confidence: 99%

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Determining individual stresses thermoelastically

Patterson

Rowlands

2008

The Journal of Strain Analysis for Engineering Design

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“…This approach is experimentally challenging due to the difficulty in measuring the harmonic at twice the loading frequency, and requires the capture of high quality data for the analysis to succeed. Recently, Rauch and Rowlands have also studied a uniaxially loaded tensile plate with a central hole and used a least-squares iteration with partial boundary information [33], filtering using a Laplacian solution [34], the incorporation of limited boundary information and a finite element simulation [35]. However, all of these approaches require significant prior knowledge of the stress distribution and so are impractical for use with complex structural components.…”

Section: Review Of Surface Stress Separationmentioning

confidence: 98%

An Integrated Approach to the Separation of Principal Surface Stresses Using Combined Thermo-Photo-Elasticity

Greene

Patterson

2006

Exp Mech

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A new instrument capable of the full-field separation of principal stresses on the surface of a component is presented. The instrument combines the techniques of thermoelastic stress analysis and reflection photoelasticity in a single optical head, permitting the simultaneous capture of both data from the same point of view. A single strain witness coating is employed for the acquisition of both the thermoelastic and photoelastic data, which is both birefringent under applied stress conditions and opaque at the infrared wavelengths to which the thermoelastic analysis system is sensitive. This enables the combined technique to be performed continuously from the same surface during loading. The performance of the new instrument is validated in the analysis of a classical laboratory specimen of known geometry. Separated stress data from the experiment is compared to simulated data, demonstrating that the accuracy of the stress separation technique is comparable to that of the individual thermoelastic and photoelastic techniques, and it is concluded that combined thermo-photo-elasticity is a powerful tool for the experimental separation of principal surface stresses.

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“…Representative thermoelastic stress analyses, some of which supplemented TSA information with other measured data, are described [2–22]. Several of these approaches used complex variables in their stress functions and mapping techniques, but the current Airy stress function technique offers the convenience of real variables.…”

Section: Introductionmentioning

confidence: 99%

Separating Stresses Thermoelastically in a Central Circularly Perforated Plate Using an Airy Stress Function

Lin¹,

Matthys²,

Rowlands³

2009

Strain

Self Cite

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Thermoelastic stress analysis (TSA) is a contemporary full‐field, non‐contacting method of experimental stress analysis. In a cyclically loaded structure which experiences adiabatic and reversible conditions, the measured local change in temperature is proportional to the change in stress. Under isotropy, the technique measures information on the sum of the principal stresses. As engineering analyses often necessitate knowing the individual components of stress, additional experimental methods or information are frequently required to ‘separate the stresses’. The ability to evaluate individual stresses reliably in a uniaxially loaded finite plate with a central circular hole from TSA‐recorded information without supplementary experimental data is demonstrated here. Measured temperature data are combined with an Airy stress function and some limited traction‐free conditions. The present inverse technique does not presuppose knowledge of the external geometry or boundary conditions, overcomes the traditional difficulties of unreliable edge data, and reduces the number of coefficients needed by satisfying the traction‐free conditions analytically on the edge of the hole. Particular attention is paid to determining a realistic value for the needed number of Airy coefficients.

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Stress separation of thermoelastically measured isopachics

Cited by 9 publications

References 18 publications

Determining individual stresses thermoelastically

Determining individual stresses thermoelastically

An Integrated Approach to the Separation of Principal Surface Stresses Using Combined Thermo-Photo-Elasticity

Separating Stresses Thermoelastically in a Central Circularly Perforated Plate Using an Airy Stress Function

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