plastic deformation
Research Topic
Language: English
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Research problems linked to this topic
- Rolling with induced strain path is one of the metal forming methods belonging to the severe plastic deformation (SPD) processes.
- In materials with high plastic anisotropy some orientations deform much more than others, leading to a large variation in strain and strain energy.
- Wear-debris-induced periprosthetic bone loss and aseptic loosening is regarded as the main long-term problem of total hip replacements (THRs).
- Distortion while quenching steel is a commonly found problem in industrial practice.
- Methods to obtain tensile stress-strain properties of materials from a practically non-destructive indentation test are of great industrial interest.
- Fracture or detachment(debond) of artificial plastic teeth from the denture base is a common clinical problem phenomenon.
- During the multi-pass wire drawing process, wires suffer a great amount of plastic deformation that is through the cross-section.
- During draw bending process of thin walled aluminum sections, undesirable deformations easily occur.
- Highly strain-hardening metals such as Al, Ni, and stainless steels, although relatively soft, are well known as being difficult to cut, because of an unsteady and highly redundant mode of plastic deformation—sinuous flow—prevailing during chip formation.
- Conventional deformation measurement techniques, such as utilizing a LVDT, a demountable mechanical strain gauge (demec gauge), and an electrical strain gauge, despite their vast usage in experimental studies, suffer several disadvantages, including high cost, time-consuming specimen preparation, and the inability to obtain the whole displacement or strain fields.
- Heavy plastic shear deformation at relatively low homologous temperatures is called high-pressure torsion (HPT) deformation, which is one method of severe plastic deformation (SPD).
- Superplastic materials exhibit very large elongations to failure,typically >500%, and this enables commercial forming of complex shaped components at slow strain rates of similar to 10(-4) s(-1).
- Severe plastic deformation (SPD) methods have been the subject of intensive investigation in recent years not only due to the superior physical and mechanical properties inherent to various ultrafine-grained materials, but also to several advantages of severely plastic-deformed materials compared to nano-structured materials manufactured by other methods through powder forms.
- In the common industrial thin sheet metal forming process at room temperature, in which in-homogenous deformation under the plane stress condition is typically the case, sheets are so ductile that sheet forming more often fails after abruptly severe strain localization, especially in the thinning mode.
- Mechanical surface treatments such as shot peening (SP) or ball-burnishing (BB) induce plastic deformation close to the surface resulting in work-hardening and compressive residual stresses.