Experimental Measurement of Residual Stress on Thermal Spray Coatings with Moire Interferometry and Hole-Drilling Method

Zhu, Jian; Zhang, Bao Ge

doi:10.4028/www.scientific.net/amm.782.335

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…The strain changes are measured and processed [98,114]. This method is also used with a combination of speckle interferometry [115][116][117][118], Moire´s interferometry, and holographic interferometry [119][120][121][122].…”

Section: Other Stress Relaxation-based Techniquesmentioning

confidence: 99%

Shape distortion in composites: sources, characterization, and remedies

Rashid

Shaker

Nawab

2023

Mehran Univ. res. j. eng. technol.

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This paper reviews the shape distortions in a polymer composite, its sources, characterization techniques, and remedies. The shape distortion may include warpage, spring-in, or change in enclosed diameter for flat, angled, and circular parts. Residual stresses are considered to be the major source of shape distortion (dimensional instability) in laminated composites. These stresses are the result of the difference in thermal expansion behavior of the different plies or between matrix and reinforcement. Additionally, fiber buckling, transversal cracking, and delamination are also produced in the composite, affecting its mechanical properties like tensile, flexural, and compression. The produced residual stresses are determined through different techniques like layer removal of symmetrical laminates, first ply failure, and x-ray diffraction. The common remedies for shape distortion reported in the literature include nanoparticle addition and variable thickness at the base or flanges.

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Section: Other Stress Relaxation-based Techniquesmentioning

confidence: 99%

Shape distortion in composites: sources, characterization, and remedies

Rashid

Shaker

Nawab

2023

Mehran Univ. res. j. eng. technol.

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Residual stress determination using full-field optical methods

Nelson

2021

J. Phys. Photonics

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Residual stresses are created in engineering components during fabrication and processing. Such stresses can strongly influence structural behavior. They are generally found by experimental means. A widely used way of finding residual stresses is removal of a small volume of material containing stresses and measurement of the strains that develop in surrounding material as a result of stresses being released. The strains can then be used to compute residual stresses. Drilling a small shallow hole is the most common way of implementing this approach, with strains measured by nearby strain gages adhered to the surface. This paper provides an overview of how full-field optical methods can be used instead of strain gages with hole drilling, overcoming limitations associated with gages and expanding capabilities of the hole drilling approach. The methods considered are holographic and electronic speckle pattern interferometry, Moire interferometry and digital image correlation. Advantages of using optical methods to find residual stresses are shown. A variety of applications is presented, ranging from determination of stresses in underground piping to stresses in microscale specimens. In addition, optical approaches employing different ways of material removal for stress release are reviewed, as well as several non-destructive optical methods for determining residual stresses.

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Experimental Measurement of Residual Stress on Thermal Spray Coatings with Moire Interferometry and Hole-Drilling Method

Cited by 2 publications

References 14 publications

Shape distortion in composites: sources, characterization, and remedies

Shape distortion in composites: sources, characterization, and remedies

Residual stress determination using full-field optical methods

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