Experimental Mechanics

Journal Information
ISSN / EISSN : 0014-4851 / 1741-2765
Current Publisher: Springer Science and Business Media LLC (10.1007)
Former Publisher: SAGE Publications (10.1177)
Total articles ≅ 3,128
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J. W. Li, Y. Xiao, F. Xu, Y. X. Wang, X. F. Hu
Experimental Mechanics; doi:10.1007/s11340-021-00707-8

Correction
D. Brizard, S. Ronel, E. Jacquelin
Experimental Mechanics; doi:10.1007/s11340-021-00702-z

J. Wei, Q. D. Wang, M. Ebrahimi, L. Zhang, D. D. Yin, H. Y. Jiang, W. J. Ding
Published: 28 April 2021
Experimental Mechanics; doi:10.1007/s11340-021-00724-7

S. Shafqat,
Published: 26 April 2021
Experimental Mechanics pp 1-21; doi:10.1007/s11340-020-00686-2

Abstract:
Background: Application of patterns to enable high-resolution Digital Image Correlation (DIC) at the small scale (μ m/nm) is known to be very challenging as techniques developed for the macro- and mesoscale, such as spray painting, cannot be scaled down directly. Moreover, existing nano-patterning techniques all rely on harsh processing steps, based on high temperature, chemicals, physical contact, liquids, and/or high vacuum, that can easily damage fragile, small-scale, free-standing and/or hygro-sensitive specimens, such as MEMS or biological samples. Objective: To present a straightforward, inexpensive technique specially designed for nano-patterning highly delicate specimens for high-resolution DIC. Methods: The technique consists in a well-controlled nebulized micro-mist, containing predominantly no more than one nanoparticle per mist droplet. The micro-mist is subsequently dried, resulting in a flow of individual nanoparticles that are deposited on the specimen surface at near-room temperature. By having single nanoparticles falling on the specimen surface, the notoriously challenging task of controlling nanoparticle-nanoparticle and nanoparticle-surface interactions as a result of the complex droplet drying dynamics, e.g., in drop-casting, is circumvented. Results: High-quality patterns are demonstrated for a number of challenging cases of physically and chemically sensitive specimens with nanoparticles from 1 μ m down to 50 nm in diameter. It is shown that the pattern can easily be scaled within (and probably beyond) this range, which is of special interest for micromechanical testing using in-situ microscopic imaging techniques, such as high-magnification optical microscopy, optical profilometry, atomic force microscopy, and scanning electron microscopy, etc. Conclusions: Delicate specimens can conveniently be patterned at near-room temperature ( $\sim $ ∼ 37 ∘C), without exposure to chemicals, physical contact or vacuum, while the pattern density and speckle size can be easily tuned.
L. Yu,
Experimental Mechanics pp 1-22; doi:10.1007/s11340-021-00723-8

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, A. K. Lakshminarayanan, P. A. S. Reed, J. M. Dulieu-Barton
Experimental Mechanics pp 1-19; doi:10.1007/s11340-021-00722-9

Abstract:
Background Friction Stir Welding (FSW) causes intense plastic deformation and consequent thermomechanical interactions resulting in a localised heterogeneous microstructure. To understand the weld mechanical behaviour, it is necessary to identify each microstructural sub-region in the weld. Objective Determine the relationship between the local microstructure and mechanical behaviour of the different microstructural regions in a FSW. Methods Scanning electron microscopy (SEM) identified the microstructural sub-regions of an FSW joint. A novel High-Resolution Digital Image Correlation (HR-DIC) methodology enabled the determination of full-field strain response to provide the mechanical behaviour of the FSW sub-regions. X-ray computed tomography (CT) identified the geometry of the FSW and material composition. Results The grain morphology in the FSW varied in the stir zone with a fine grain structure in the weld nugget and larger grains in the thermomechanical affected zone (TMAZ); the grains were larger in the retreating side (RS) compared to the advancing side (AS). Tungsten deposits were found in the weld nugget and attributed to tool wear. The mechanical properties of the weld subregions showed that the material in the stir zone had a greater yield strength than the base material and the RS of the FSW was much more ductile than the weld nugget and the AS side. The tungsten distributions in the stir zone correlated with the local mechanical behaviour. Conclusions A novel methodology is developed that combines microstructural observations with HR-DIC enabling, for the first time, the FSW sub-region mechanical behaviour, to be related to the local grain morphology and inclusions caused by tool wear.
A. J. McGhee, E. O. McGhee, J. E. Famiglietti,
Experimental Mechanics pp 1-11; doi:10.1007/s11340-021-00713-w

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