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Author: YuZhong Dai
Publisher:
ISBN:
Category : Deformations (Mechanics)
Languages : en
Pages : 346
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Book Description
Author: YuZhong Dai
Publisher:
ISBN:
Category : Deformations (Mechanics)
Languages : en
Pages : 346
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Book Description
Author: Aki Ensio Valkonen
Publisher:
ISBN: 9789517544009
Category : Deformations (Mechanics)
Languages : en
Pages : 918
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Book Description
Author: Hao Zhang
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 0
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Book Description
Surface severe plastic deformation attracts more and more attentions because its capability to enhance material surface. However, for the hard-to-deform materials, higher peening intensity leads to surface or subsurface cracks, while lower peening intensity may not be sufficient to effectively induce beneficial microstructural changes. In this dissertation, energy assisted-surface severe plastic deformation is proposed to improve the effectiveness of surface severe plastic deformation on hard-to-deform alloys. Three different energy input methods, direct current, pulsed current, and laser were used to integrate with LSP and UNSM in processing metallic materials. Direct current can rapidly increase the bulk temperature of the 3D-printed Ti64 during UNSM process. Compared with the conventional UNSM process, better surface finish and lower subsurface porosities were obtained after DC-UNSM. DC-UNSM also led to a deeper plastically-affected depth compared with conventional UNSM. Numerical modelling showed that localized heating occurs near the pores in 3D-printed Ti64 subjected to electric current, which could potentially facilitate pore closure under ultrasonic striking. Electropulsing assisted-LSP (EP-LSP) produced higher surface hardness and deeper hardened layer on conventional Ti64, both of which indicate greater plastic deformation compared with LSP. Electropulsing assisted tensile test showed that pulsed current can more effectively decrease the flow stress even though the bulk heating effect is the same. In addition, the higher the peak current density, the more effective the flow stress reduction. It is believed that an athermal effect in addition to the thermal effect related to pulsed current exists in EP-LSP. Laser assisted UNSM (LA-UNSM) is proposed as an alternative to post-process 3D-printed Ti64. The localized thermal effect of continuous laser also decreases the flow stress of the alloy effectively. Smoother and harder surface was obtained after LA-UNSM due to the enhanced plasticity by pure thermal effect. In addition, LA-UNSM also led to a thicker plastically-affected layer and lower porosity compared with traditional UNSM process. In summary, an innovation concept and surface engineering technology, energy assisted surface severe plastic deformation was proposed to improve the effectivity and efficiency of severe plastic deformation on processing hard-to-deform alloys, which integrates the advantages of SSPD to introduce surface plastic deformation induced strengthening effect, with the ability of extra energies to improve plasticity through their thermal and athermal effects.
Author: Heng Li
Publisher: Elsevier
ISBN: 0128143819
Category : Technology & Engineering
Languages : en
Pages : 350
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Book Description
Deformation Based Processing of Materials: Behavior, Performance, Modeling and Control focuses on deformation based process behaviors and process performance in terms of the quality of the needed shape, geometries, and the requested properties of the deformed products. In addition, modelling and simulation is covered to create an in-depth and epistemological understanding of the process. Other topics discussed include ways to efficiently reduce or avoid defects and effectively improve the quality of deformed parts. The book is ideal as a technical document, but also serves as scientific literature for engineers, scientists, academics, research students and management professionals involved in deformation based materials processing.
Author: Anglo Kamel Tadros
Publisher:
ISBN:
Category :
Languages : en
Pages : 100
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Book Description
An experimental and theoretical study of limit strains for the plastic deformation of sheet metals is presented. It is postulated that incipient grooves may appear during stable plastic flow but that a single groove will not exhibit continuing growth until diffuse necking occurs. It is therefore proposed that the well known Marciniak and Kuczynski analysis should be applied to a material from the time diffuse necking sets in. The total limit strain will then be the sum of the strains up to general instability and the strain necessary to give a localized neck according to the modified application of the Marciniak and Kuczynski analysis. The difficulty of assigning the thickness parameter f at the general instability condition remains. It would seem reasonable, however, to expect the value of f at diffuse necking to depend in some manner on the amount of plastic work expended on the material up to that point. Experiments were carried out into the in-plane stretching of steel, aluminium and 70/30 brass sheets. The development of strains was studied together with measurements of limit strains for conditions between plane strain tension and balanced biaxial tension. Also, the development of surface roughness was measured at different stages of the deformation. Measurements of surface roughness for steel and aluminium at the level of the predicted instability condition demonstrated that small grooves had appeared in the sheet. The sheet materials were selected to cover a wide range of n-values and r-values. The measured limit strain for steel and aluminium could be explained in term of the theoretical model. The behaviour of the 70/30 brass was unusual in that the measured limit strains were always less than the instability strains predicted by the classical theory of Swift. The in-plane test eliminated friction and reduces the strain gradient in the region of a neck and has proved a very suitable method for the determination of limit strains.
Author: Uday Shanker Dixit
Publisher: Springer
ISBN: 9811303789
Category : Technology & Engineering
Languages : en
Pages : 259
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Book Description
This book focuses on strengthening and joining materials by means of plastic deformation, gathering extended research papers presented at the AIMTDR 2016 conference. Plastic deformation is used in materials processing to improve the strength of the material. For example, the rod/screw used to connect the cooker handle to the main body has to be strong and sustainable; such rods can be strengthened by plastic deformation (using multi-stage forming operations etc.). Similarly, joining by means of plastic deformation is highly valuable since it avoids the material and environmental degradation often caused by fusion welding processes. The book discusses various processing techniques in which plastic deformation is used to strengthen materials – e.g. in equal channel angular extrusion, autofrettage etc., or to join materials without melting them – e.g. in friction stir processing, riveting etc. Offering an extensive guide, the book includes chapters on roll bonding, equal channel angular pressing, autofrettage, friction stir processing/welding, magnetic pulse welding, and riveting – processes used to strengthen and join a variety of materials for lightweight applications and sustainable manufacturing. The contents of this book will be useful to researchers and practitioners alike.
Author: J.P. Boehler
Publisher: Springer Science & Business Media
ISBN: 9401136440
Category : Technology & Engineering
Languages : en
Pages : 709
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Book Description
Present developments in materials science, mechanics and engineering, as well as the demands of modern technology, result in a new and growing interest in plasticity and in bordering domains of the mechanical behavior of materials. This growing interest is attested to by the success of both The International Journal of Plasticity, which after its inception rapidly became the leading journal for plasticity research, and the series ofInternational Symposia on Plasticity and Its Current Applications, which is now the premier international forum for plasticity research dissemination. The First International Symposium on Plasticity and Its Current Applications was conceived and organized by Professor Akhtar S. Khan, and was held at the University of Oklahoma (Norman, Oklahoma, USA) from July 30 to August 3, 1984. It was attended by over one hundred scientists from fifteen countries. "Plasticity '89: the Second International Symposium on Plasticity and Its Current Applications" was held at Mie University (Tsu, Japan) from July 31 to August 4, 1989; this symposium was co-chaired by Professors Khan and Tokuda. The main emphasis of this meeting was on dynamic plasticity and micromechanics, although it included other aspects of plasticity as well. It was attended by over two hundred researchers from twenty-three nations.
Author: Ulrich Krupp
Publisher: John Wiley & Sons
ISBN: 3527315373
Category : Technology & Engineering
Languages : en
Pages : 312
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Book Description
This comprehensive overview of the whole field of fatigue and fracture of metallic materials covers both the theoretical background and some of the latest experimental techniques. It provides a summary of the complex interactions between material microstructure and cracks, classifying them with respect to the overall damage process with a focus on microstructurally short cracks and dynamic embrittlement. It furthermore introduces new concepts for the numerical treatment of fatigue microcrack propagation and their implementation in fatigue-life prediction models.This comprehensive overview of the whole field of fatigue and fracture of metallic materials covers both the theoretical background and the latest experimental techniques. It provides a summary of the complex interactions between material microstructure and cracks, classifying them with respect to the overall damage process. It furthermore introduces new concepts for the numerical treatment of fatigue microcrack propagation and their implementation in fatigue-life prediction models.
Author: Irina Goryacheva
Publisher: Frontiers Media SA
ISBN: 2889667618
Category : Technology & Engineering
Languages : en
Pages : 391
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Book Description
Author: Harold Earl Bennett
Publisher:
ISBN:
Category : High power lasers
Languages : en
Pages : 560
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Book Description
