Development of Patterns for Digital Image Correlation Measurements at Reduced Length Scales

Scrivens, Walter A.; Luo, Yi; Sutton, Michael A.; Collette, Stéphanie; Myrick, Michael L.; Miney, Paul G.; Colavita, Paula E.; Reynolds, Anthony P.; Li, Xiaodong

doi:10.1007/s11340-006-5869-y

Cited by 131 publications

(88 citation statements)

References 49 publications

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“…Following the procedures described in Part I, To have much smaller size of gold pattern on the aluminum specimen, the evaporation coating technique [26] is used instead of the photo resistance development technique for the ×200 pattern. Briefly, a thin gold coating is re arranged to develop the appropriate random pattern for the image correlation.…”

Section: ×10000 Tensile Loading Experimentsmentioning

confidence: 99%

Scanning Electron Microscopy for Quantitative Small and Large Deformation Measurements Part II: Experimental Validation for Magnifications from 200 to 10,000

Sutton

Garcia³

et al. 2007

Exp Mech

Self Cite

185

128

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Section: ×10000 Tensile Loading Experimentsmentioning

confidence: 99%

Scanning Electron Microscopy for Quantitative Small and Large Deformation Measurements Part II: Experimental Validation for Magnifications from 200 to 10,000

Sutton

Garcia³

et al. 2007

Exp Mech

Self Cite

185

128

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“…To apply a micro-scale pattern to the specimen, the procedure described in previous publications [42][43][44][45][46] is used. For comparison to the vision-based measurements, a single strain gage is aligned with the loading direction.…”

Section: Methodsmentioning

confidence: 99%

Characterization and Model Assessment for Impact Damage Evolution in Functionally Graded Composites Using a Novel Nanosecond Deformation Measurement System

McNeill¹,

Sutton²,

Bruck³

2006

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Public Reporting Burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimate or any other aspect of this collection of information, including suggesstions for reducing this burden, Report Title ABSTRACTThe principal goal of this research is to experimentally measure the three-dimensional transient deformation processes that occur in armor systems undergoing a range of dynamic loading conditions. The development of a 3-D image correlation system using digital cameras capable of acquiring images every 5 nano-seconds were used. Due to the nature of the cameras, extensive algorithms for the removable of image distortions were required. The image correlation technology was transferred to army personal through a 1 year sabbatical at ARL's Aberdeen research facility by the principal investigator.

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“…In literature two methods are found to create speckle patterns of this size. One involves toner powder deposition and the other contact lithography; both are described in [26][27][28].…”

Section: Digital Image Correlationmentioning

confidence: 99%

Characterisation of weld heterogeneity through hardness mapping and miniature tensile testing

Bally

Waele

Verleysen

et al. 2015

SCAD

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Abstract:Welding is a widely adopted industrial process used for joining components. A fusion weld has a highly heterogeneous microstructure and characterisation of strength heterogeneity is difficult because of the potentially large variations over a limited distance. Hardness mapping and miniature tensile tests are two distinct approaches to this problem. This paper reports on the possibilities and limitations of both techniques. Hardness mapping is a well-documented procedure as opposed to miniature tensile testing, where the dimensions of the dogbone shaped specimens are smaller than what standards prescribe. A particular challenge is the measurement of strains in such small specimens. The authors have achieved this measurement by means of Digital Image Correlation (DIC). To that end, a sufficiently fine speckling method has been developed.Keywords: heterogeneity; hardness mapping; miniature tensile testing; DIC INTRODUCTIONWelding is one of the most common joining methods due to its generally high production speed and low associated costs. It is often associated with flexibility, integrity and reliability [1]. An example application showing the economic importance of welding is pipeline installation. Costs associated to fusion welding are estimated to make up 20% of the total cost of pipe laying. These include aligning the pipe sections, cleaning and grinding, welding, checking the weld for flaws and coating the weld [2].Notwithstanding the economical appeal of welding, the localized application of heat and melting results in a high susceptibility to material discontinuities, flaws and residual stresses, whose presence may lead to structural failure and lifetime reduction. The prediction of weld flaw acceptability ('structural integrity') is hampered by the potential presence of strongly heterogeneous microstructures. Modern day weld flaw assessment ignores this heterogeneity by assuming a homogeneous weld. As such, a generally accepted method to characterise weld heterogeneity does not yet exist. STATE OF THE ARTHeterogeneity is inherent to fusion welds, because in order to melt the weld metal and fuse it with the base metal, heat has to be locally applied. For thicker sections, weldments are created in several passes (deposition of multiple layers), resulting in a variety of zones undergoing a succession of particular heat cycles. The heat cycle determines what the microstructure transforms into, each structure having a different stress-strain response. Not only the weld metal is heterogeneous due to this, but the heat affected zone (HAZ) of the base metal (heated but non-melted metal in close vicinity of the weld) also transforms.Many conventional steel welds show a hardened HAZ due to the occurrence of stronger microstructures. In contrast, a broad range of high strength low alloy steels obtain their properties from a fine grain size, resulting from a specific heat treatment, often combined with mechanical deformation. These steels may show a softened HAZ due to grain coarsening. To quantify variations ...

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Development of Patterns for Digital Image Correlation Measurements at Reduced Length Scales

Cited by 131 publications

References 49 publications

Scanning Electron Microscopy for Quantitative Small and Large Deformation Measurements Part II: Experimental Validation for Magnifications from 200 to 10,000

Scanning Electron Microscopy for Quantitative Small and Large Deformation Measurements Part II: Experimental Validation for Magnifications from 200 to 10,000

Characterization and Model Assessment for Impact Damage Evolution in Functionally Graded Composites Using a Novel Nanosecond Deformation Measurement System

Characterisation of weld heterogeneity through hardness mapping and miniature tensile testing

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