Thermoelastic and infrared-thermography methods for surface strains in cracked orthotropic composite materials

Haj-Ali, Rami; Wei, Bo-Siou; Johnson, Shane A.; Elhajjar, Rani

doi:10.1016/j.engfracmech.2007.02.014

Cited by 30 publications

(15 citation statements)

References 12 publications

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“…This method was used to verify damage studies in thick-section composite materials considered by Kilic and Haj-Ali [31,32] . Several studies have also investigated the use of TSA-IR to evaluate mixed-mode stress intensity factors of anisotropic laminates [30,33] . Wei et al [34] used TSA-IR with stochastic Markov Chains to characterize the fatigue damage in composite laminates and they proposed a method to predict the S-N curve.…”

Section: Introductionmentioning

confidence: 99%

“…An IR based method was also proposed and used to track the damage in [AE45 ] and [0=90 ] type graphite=epoxy laminates [28] . El-Hajjar and Haj-Ali [29,30] used TSA-IR to measure the sum of the direct strains on the surface of thick-section pultruded composites. Their method was verified experimentally and compared favorably with FE simulations of notched and cracked coupons.…”

Section: Introductionmentioning

confidence: 99%

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An Infrared Thermoelastic Stress Analysis Investigation for Detecting Fiber Waviness in Composite Structures

Elhajjar

Haj-Ali

Wei

2014

Polymer-Plastics Technology and Engineering

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A full-field thermoelastic stress analysis infrared (TSA-IR) method is used to investigate the possibility of inspecting for out of plane fiber waviness in composite structures. Two different waviness profiles are generated and compared to control specimen having no anomalies. Tension and compression loading schemes are investigated and the TSA-IR emissions are compared to cross-sectional investigations. A subset of the specimens is also notched to investigate the thermal emissions from holes when compared to the waviness. The interaction of the hole and waviness shows the errors that can be introduced when using TSA-IR for quantitative analysis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Infrared Thermoelastic Stress Analysis Investigation for Detecting Fiber Waviness in Composite Structures

Elhajjar

Haj-Ali

Wei

2014

Polymer-Plastics Technology and Engineering

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“…Accurately measuring the mechanical properties can be challenging, especially in small specimens typically produced when developing new materials in small quantities (Haj-Ali et al, 2008;Zhang et al, 2013). For example, during the development phases of powder metallurgy-processed materials, specimen sizes in the range of 10-25 mm are typically obtained, that are later consolidated, which make it difficult to obtain large specimens for use in tension or compression tests.…”

Section: Introductionmentioning

confidence: 99%

The Diametrically Loaded Cylinder for the Study of Nanostructured Aluminum–Graphene and Aluminum–Alumina Nanocomposites Using Digital Image Correlation

et al. 2016

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Non-contact methods for characterization of metal matrix composites have the potential to accelerate the development and study of advanced composite materials. In this study, diametrical compression of small disk specimens was used to understand the mechanical properties of metal matrix micro-and nanocomposites. Analysis was performed using an inverse method that couples digital image correlation and the analytical closed-form formulation. This technique was capable of extracting the tension and compression modulus values in the metal matrix nanocomposite (MMNC) disk specimens. Specimens of aluminum and aluminum reinforced with either Al 2 O 3 nanoparticles or graphene nanoplatelets were synthesized using a powder metallurgy approach that involved room temperature milling in ethanol and low temperature drying followed by single action compaction. The elastic and failure properties of MMNC materials prepared using the procedure above are presented.

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“…As a result, the detection of small temperature in the mK range becomes feasible. This thermography technique has been previously used in various engineering mechanics measurements (e.g., stress gradients) or defect evaluations when the thermoelastic effect is present (i.e., infrared signals related to sum of principal stresses) (Wu et al 1994;Meola et al 2006;Elhajjar et al 2014;Haj-Ali et al 2008). Here, PST is investigated for evaluating the fabrication quality of magnetostrictive materials.…”

Section: Introductionmentioning

confidence: 99%

Full-field infrared phase sensitive thermography for microstructural investigation of giant magnetostrictive materials

Yang

Law

Elhajjar

2017

Mech Adv Mater Mod Process

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Background: Giant magnetostrictive materials are increasingly proposed for smart material applications such as in sensors, actuators, and energy harvesting applications. However, reviewing the literature on this topic, the reader observes a large amount of variability in the reported properties that are typically generated from overall strain or point-value strain measurements obtained with strain gages using the far field estimate to project the internal magnetic field in the specimen. Methods: A full-field phase-sensitive thermography method is proposed to correlate the full-field infrared measurements to changes in the microstructure induced by a cyclic magnetic field in a giant magnetostrictive alloy material. Results: The results show the potential of the proposed method in rapidly uncovering the effects of geometry and defects on the magnetostrictive response. The results show responses at the microstructure level from both magnetocaloric and magnetostrictive effects. Conclusions: The effects of the magnetostrictive material's microstructural spatial variability and the specimen geometry on the localized magnetostrictive response warrant serious considerations but so far have not received significant attention. The method proposed is capable of highlighting magneto-elastic coupling in the composite specimens using the cycle magnetic field.

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Thermoelastic and infrared-thermography methods for surface strains in cracked orthotropic composite materials

Cited by 30 publications

References 12 publications

An Infrared Thermoelastic Stress Analysis Investigation for Detecting Fiber Waviness in Composite Structures

An Infrared Thermoelastic Stress Analysis Investigation for Detecting Fiber Waviness in Composite Structures

The Diametrically Loaded Cylinder for the Study of Nanostructured Aluminum–Graphene and Aluminum–Alumina Nanocomposites Using Digital Image Correlation

Full-field infrared phase sensitive thermography for microstructural investigation of giant magnetostrictive materials

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