Experimental investigations of three-dimensional effects near a crack tip using computer vision

Sutton, Michael A.; Turner, John E.; Chao, Y. J.; Bruck, Hugh A.; Chae, T. L.

doi:10.1007/bf00017337

Cited by 48 publications

(3 citation statements)

References 20 publications

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“…Digital Image Correlation (DIC) is a powerful non-contact optical measurement technique utilized to evaluate the deformation and displacement characteristics of various materials and structures. One of DIC’s key advantages is its capability to capture full-field deformation, which encompasses the entire surface of a specimen [ 16 , 17 , 18 , 19 , 20 , 21 ]. This feature is particularly beneficial for structures such as pipeline girth welds, which exhibit nonuniform material properties and inhomogeneous deformation behavior.…”

Section: Introductionmentioning

confidence: 99%

Inhomogeneous Strain Behaviors of the High Strength Pipeline Girth Weld under Longitudinal Loading

Zhang,

Ma,

Liu

et al. 2024

Materials

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Unforeseen failures in girth welds present a significant challenge for the pipeline industry. This study utilizes 3D Digital Image Correlation (DIC) assisted cross-weld tensile testing to analyze the strain response of high-strength thick-walled pipelines, providing essential insights into the strain migration and fracture mechanisms specific to girth welds. The results reveal that the welding process significantly affects the mechanical distribution within the girth weld. The tested Shielded Metal Arc Welded (SMAW-ed) pipe exhibited undermatched girth welds due to high heat input, while Gas Metal Arc Welding (GMAW) introduced a narrower weld and Heat-Affected Zone (HAZ) with higher hardness than the base metal, indicative of overmatched girth welds. Strain migration, resulting from a combination of metallurgical heterogeneous materials and geometrical reinforcement strengthening, progressed from the softer HAZ to the base metal in the SMAW-ed sample with reinforcement, ultimately leading to fracture in the base metal. In contrast, the GMAW-ed sample shows no strain migration. Reinforcement significantly improves the tensile strength of girth welds and effectively prevents failure in the weld region. Sufficient reinforcement is crucial for minimizing the risk of failure in critical areas such as the weld metal and HAZ, particularly in SMAW-ed pipes.

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Section: Introductionmentioning

confidence: 99%

Inhomogeneous Strain Behaviors of the High Strength Pipeline Girth Weld under Longitudinal Loading

Zhang,

Ma,

Liu

et al. 2024

Materials

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“…For example, the accuracy achievable with image correlation in continuous regions is reduced in the presence of high‐gradient material nonlinearities such as plasticity 42 or fracture 43 . As a result, it is common practice to omit such results, either through the masking of data before analysis or by detecting and removing spurious results after correlation 33,34,44–46 . Several strategies have been proposed that maximise the remaining data through selective masking strategies 47,48 …”

Section: Introductionmentioning

confidence: 99%

“…43 As a result, it is common practice to omit such results, either through the masking † of data before analysis or by detecting and removing spurious results after correlation. 33,34,[44][45][46] Several strategies have been proposed that maximise the remaining data through selective masking strategies. 47,48 This review aims to provide an extensive overview of the three postprocessing techniques reported in the literature to extract fracture properties from DIC and DVC computed displacement data.…”

Section: Introductionmentioning

confidence: 99%

Extracting fracture properties from digital image and volume correlation displacement data: A review

Becker

2023

Strain

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The advent of digital image and volume correlation has attracted wide use in fracture mechanics. The full‐field nature of digital image and volume correlation allows for the integration of computational fracture mechanics to analyse cracked samples quantitatively. This review provides a comprehensive overview of current methods used to extract fracture properties from full‐field displacement data. The term full‐field fracture mechanics is introduced to highlight the uniqueness of using inherently noisy experiential data to extract fracture properties. The review focuses on post‐processing‐based approaches rather than integrated approaches, as these have less limitations and are more commonly employed. There are four approaches that are discussed in extracting fracture properties from experimentally computed displacement data: field‐fitting, integral, crack‐opening and cohesive zone modelling approaches. This is further developed to discuss problems associated with using digital image and volume correlation to extract properties, including application examples.

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Digital Image Correlation

Bornert¹,

Hild²,

Orteu³

et al. 2012

Full‐Field Measurements and Identification in Solid Mechanics

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Experimental investigations of three-dimensional effects near a crack tip using computer vision

Cited by 48 publications

References 20 publications

Inhomogeneous Strain Behaviors of the High Strength Pipeline Girth Weld under Longitudinal Loading

Inhomogeneous Strain Behaviors of the High Strength Pipeline Girth Weld under Longitudinal Loading

Extracting fracture properties from digital image and volume correlation displacement data: A review

Digital Image Correlation

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