A quantitative thermoelastic stress analysis method for pultruded composites

Rani El-Hajjar; Rami Haj-Ali

doi:10.1016/S0266-3538(03)00012-5

A quantitative thermoelastic stress analysis method for pultruded composites

Research output: Contribution to journal › Article › peer-review

Abstract

A non-contact Thermoelastic Stress Analysis (TSA) method is proposed to measure the sum of the direct strain components on the coated surface of thick pultruded composites. Traditionally, TSA methods are used to relate the change of surface temperature to the change of the first invariant of the stress. The proposed method takes advantage of the in-plane transversely isotropic surface layer and relates the measured temperature change to the sum of the surface strains because the latter are directly related to the first invariant of stress. Quantitative strain measurements using the TSA method are verified for multi-axial stress states by comparing the measured in-plane strain invariant in plate samples with a circular hole to those obtained from finite element (FE) simulations. Good comparisons are obtained when compared to the FE strain contours.

Original language	English
Pages (from-to)	967-978
Number of pages	12
Journal	Composites Science and Technology
Volume	63
Issue number	7
DOIs	https://doi.org/10.1016/S0266-3538(03)00012-5
State	Published - May 2003
Externally published	Yes

Keywords

A. Layered structures
B. Thermomechanical properties
C. Finite element analysis (FEA)
D. Differential thermal analysis (DTA)
E. Pultrusion

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10.1016/S0266-3538(03)00012-5

Cite this

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abstract = "A non-contact Thermoelastic Stress Analysis (TSA) method is proposed to measure the sum of the direct strain components on the coated surface of thick pultruded composites. Traditionally, TSA methods are used to relate the change of surface temperature to the change of the first invariant of the stress. The proposed method takes advantage of the in-plane transversely isotropic surface layer and relates the measured temperature change to the sum of the surface strains because the latter are directly related to the first invariant of stress. Quantitative strain measurements using the TSA method are verified for multi-axial stress states by comparing the measured in-plane strain invariant in plate samples with a circular hole to those obtained from finite element (FE) simulations. Good comparisons are obtained when compared to the FE strain contours.",

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AU - Haj-Ali, Rami

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AB - A non-contact Thermoelastic Stress Analysis (TSA) method is proposed to measure the sum of the direct strain components on the coated surface of thick pultruded composites. Traditionally, TSA methods are used to relate the change of surface temperature to the change of the first invariant of the stress. The proposed method takes advantage of the in-plane transversely isotropic surface layer and relates the measured temperature change to the sum of the surface strains because the latter are directly related to the first invariant of stress. Quantitative strain measurements using the TSA method are verified for multi-axial stress states by comparing the measured in-plane strain invariant in plate samples with a circular hole to those obtained from finite element (FE) simulations. Good comparisons are obtained when compared to the FE strain contours.

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A quantitative thermoelastic stress analysis method for pultruded composites

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