Ultrasonic nondestructive evaluation of microstructural changes of solid materials under plastic deformation—Part I. Theory

Kobayashi, Michiaki

doi:10.1016/s0749-6419(98)00005-9

Cited by 53 publications

(12 citation statements)

References 8 publications

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“…Later this theory was expanded by Maurel [13]. Experimental investigations of the propagation velocity and the attenuation of ultrasound waves in metallic materials during plastic flow were carried out by Gremaud et al [14], by Ogi et al [15], by Zuev et al [16,17] and Kobayashi [18,19].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Parameters as Criteria of Localized Deformation in Aluminum Alloys

et al. 2018

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Investigations of propagation velocity and attenuation change of the Rayleigh waves depending on plastic strain localization in materials having the Portevin-Le Chatelier effect are presented in this paper. Measurements of the ultrasound wave characteristics were carried out in situ during specimen tensile at the constant rate and room temperature. Registration of localized strain band kinetics was performed with the digital speckle photography method. The regularity of ultrasound velocity change during the band propagation through the ultrasound measurement area was discovered.

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Section: Introductionmentioning

confidence: 99%

Acoustic Parameters as Criteria of Localized Deformation in Aluminum Alloys

et al. 2018

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“…When the fronts move to the area of acoustic measurements, a maximum is formed on the V(ε) curve and the ultrasound velocity starts decreasing, since the front moves inside the acoustic measurement area. During plastic deformation, two types of stresses has an effect on the propagation velocity of ultrasonic waves: macrostresses caused by an external applied load [40] and microstresses caused by the evolution of the dislocation structure [27][28][29]41]. The formation of the Luders band leads to the fact that the stresses in the sample are localized in the Luders band, and the stresses in the remaining volume of the sample are decreased.…”

Section: Stress-strain Curves and Propagation Of Elastic Surface Raylmentioning

confidence: 99%

“…Recently, an acoustic analysis of materials under loading has been developed in the field of plastic deformation in theoretical and experimental studies by Kobayashi [27,28], Maurel [29], Zuev [30]. At present, individual groups of researchers only start developing such an approach, mainly by using idealized simple model media.…”

Section: Introductionmentioning

confidence: 99%

Macroscopic criteria for the deformation and fracture of iron based alloys

Орлова

Lunev

Данилова

et al. 2017

Frattura Ed Integrità Strutturale

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ABSTRACT. In the article the deformation of different steels is analyzed using the autowave theory of plasticity. The article considers the possible use of an autowave model to formulate criteria for the structural strength of materials and elastic-plastic transition. The time and place of future fracture for steel samples are shown can be predicted before visible necking takes place by using the kinetic dependencies of localized plasticity domains at the prefracture stage. The results show that during elastic-plastic transition in lowcarbon steel, there is the break of the curve for the ultrasound velocity versus deformation, which can serve as an acoustic criterion of irreversible deformation for the pressure treatment of metals, the operation and nondestructive testing of products and structures.

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“…[11] The cost and complexity associated with the use of these instruments often prevent their application in routine quality control and, therefore, during the development and use of a manufacturing process, visual inspection may be the only form of quality control. In this paper, we demonstrate how magnetic levitation (MagLev) enables (i) the identification of parts with embedded defects, (ii) the separation of a defective part from a single batch, (iii) the characterization of certain kinds of defects, and (iv) the detection of counterfeit, high-value plastic parts.…”

Section: Introductionmentioning

confidence: 99%

Using Magnetic Levitation for Non‐Destructive Quality Control of Plastic Parts

et al. 2015

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INTRODUCTIONLarge-scale, reliable, and economical manufacturing of plastic objects ("parts") [1] is critical for a range of industrial applications (e.g. medical devices, automotive parts, small consumer goods, micro-electro-mechanical systems (MEMS), and optical devices, among others). Plastic parts are chosen (over metal, for example) in many cases, in order to lower the cost (as well as weight, corrosion resistance, and other properties) of the final assembled product. Depending on the scale of manufacturing, costs favor relatively simple techniques such as injection molding, casting, stamping, or machining for producing products with a range of shapes from raw, polymeric plastics. [1] Low-cost plastic parts must maintain an acceptable level of quality to avoid failure in use. In an optimized production process, occasional defects, such as voids, cracks, or embedded impurities can occur during routine manufacturing. [2][3][4][5][6][7] Defective parts, if not identified, can lead to the failure of the final assembled product. Non-destructive methods are thus required to identify defective parts that deviate from quality standards resulting either from manufacturing (both process optimization and volume production) or improper storage or use of the part.Current non-destructive methods that have been used to test the quality of molded parts in specialized and critical applications include industrial computed tomography (ICT), [8,9] infrared thermography, [10] and ultrasonic testing. [11] The cost and complexity associated with the use of these instruments often prevent their application in routine quality control and, therefore, during the development and use of a manufacturing process, visual inspection may be the only form of quality control. In this paper, we demonstrate how magnetic levitation (MagLev) enables (i) the identification of parts with embedded defects, (ii) the separation of a defective part from a single batch, (iii) the characterization of certain kinds of defects, and (iv) the detection of counterfeit, high-value plastic parts. MagLev can suspend and orient [12] an object without contact by balancing gravitational and magnetic forces. [13] Here we show that the orientation of a part that is magnetically levitated depends strongly on both its shape and heterogeneity in density. This characteristic enables rapid identification of a defective part by visual inspection of the levitation height or angle of orientation in comparison to the rest of the parts in the batch. The method is inexpensive, non-destructive and straightforward to implement. The portability of the MagLev device has the potential to allow quality control of parts at the point-of-manufacturing, the pointof-sale, and the point-of-use.We used a similar MagLev device setup to those previously described. [13] Briefly, the object is suspended in a container filled with a paramagnetic solution (e.g., aqueous manganese chloride, MnCl 2 , or paramagnetic ionic liquids) [14] and the container is placed between two NdFeB magnets oriented w...

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Ultrasonic nondestructive evaluation of microstructural changes of solid materials under plastic deformation—Part I. Theory

Cited by 53 publications

References 8 publications

Acoustic Parameters as Criteria of Localized Deformation in Aluminum Alloys

Acoustic Parameters as Criteria of Localized Deformation in Aluminum Alloys

Macroscopic criteria for the deformation and fracture of iron based alloys

Using Magnetic Levitation for Non‐Destructive Quality Control of Plastic Parts

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