scholarly journals Numerical modeling of strain hardening effect on an AFM cantilever undergoing stress in tapping mode

Nano Select ◽  
2021 ◽  
Author(s):  
Adedayo S. Adebayo ◽  
James Rotimi Osundiya
Keyword(s):  
Numerical Modeling ◽  
Strain Hardening ◽  
Tapping Mode ◽  
Hardening Effect ◽  
Afm Cantilever

Study on Dynamic Mechanical Response of TC21 Alloy

2011 ◽  
Vol 88-89 ◽  
pp. 674-678
Author(s):  
Shuang Zan Zhao ◽  
Xing Wang Cheng ◽  
Fu Chi Wang
Keyword(s):  
Flow Stress ◽  
High Strain Rate ◽  
Strain Rate ◽  
Strain Hardening ◽  
High Strain ◽  
Dynamic Flow ◽  
Dynamic Mechanical ◽  
Hardening Effect ◽  
High Strain Rate Deformation ◽  
Binary Morphology

Some results of an experimental study on high strain rate deformation of TC21 alloy are discussed in this paper. Cylindrical specimens of the TC21 alloys both in binary morphology and solution and aging morphology were subjected to high strain rate deformation by direct impact using a Split Hopkinson Pressure Bar. The deformation process is dominated by both thermal softening effect and strain hardening effect under high strain rate loading. Thus the flow stress doesn’t increase with strain rate at the strain hardening stage, while the increase is obvious under qusi-static compression. Under high strain rate, the dynamic flow stress is higher than that under quasi-static and dynamic flow stress increase with the increase of the strain rate, which indicates the strain rate hardening effect is great in TC21 alloy. The microstructure affects the dynamic mechanical properties of TC21 titanium alloy obviously. Under high strain rate, the solution and aging morphology has higher dynamic flow stress while the binary morphology has better plasticity and less prone to be instability under high strain rate condition. Shear bands were found both in the solution and aging morphology and the binary morphology.

Neoproterozoic sedimentation on the northeast margin of Laurentia and the opening of Iapetus

1994 ◽  
Vol 131 (3) ◽  
pp. 291-299 ◽  
Author(s):  
N. J. Soper
Keyword(s):  
Shallow Water ◽  
Strain Hardening ◽  
East Greenland ◽  
Eastern Margin ◽  
Sedimentary Sequences ◽  
Pan African ◽  
Hardening Effect ◽  
The Pacific ◽  
The Future ◽  
Cordilleran Margin

AbstractVery thick shallow water sedimentary sequences were deposited in Neoproterozoic time along the future margins of Laurentia. On the eastern margin these include the Eleonore Bay and Hecla Hoek sequences of Greenland and Svalbard; these are described and their geotectonic context briefly reviewed. They present both geotectonic and geodynamic problems: why did subsidence continue for some 300 Ma prior to the opening of Iapetus, and how could 15–20 km of sediment be accommodated in an ensialic environment?Prolonged slow stretching appears to have affected the eastern margin of Laurentia while the western (Cordilleran) margin progressed through the rift-drift transition as the Pacific opened. It is proposed that expansion of the Pacific was associated with both the convergence of Proto-Gondwanan continental terranes during the Pan-African orogeny (the extended SWEAT hypothesis) and also the maintenance of very slow extension rates on the future Iapetus margin. The strain-hardening effect of slow stretching may have been inhibited by a continuous basin-fill of juvenile heat-producing Grenville detritus. The onset of subduction in the Pacific freed up this margin; major rifting took place between East Greenland and possibly the Tornquist margin of Baltica in Vendian time, followed by the opening of northern Iapetus.

The strain-hardening effect in HRR plane fields according to T-criterion

1994 ◽  
Vol 67 (2) ◽  
pp. 117-132 ◽  
Author(s):  
Pericles S. Theocaris ◽  
C. B. Demakos
Keyword(s):  
Strain Hardening ◽  
Hardening Effect

scholarly journals Effect of Strain Hardening on Increase in Collapse Pressure during the Manufacture of ERW Pipe

2020 ◽  
Vol 10 (14) ◽  
pp. 5005 ◽  
Author(s):  
Seong-Wook Han ◽  
Yeun Chul Park ◽  
Ho-Kyung Kim ◽  
Soo-Chang Kang
Keyword(s):  
Strain Hardening ◽  
Cross Sections ◽  
Material Model ◽  
Compressive Yield Strength ◽  
Element Analysis ◽  
Collapse Pressure ◽  
Hardening Effect ◽  
Manufacture Process ◽  
Current Design ◽  
History Of

Plastic deformation during the manufacture process of electric resistance welded (ERW) pipe determines the stress–strain relationship of the steel pipe, which affects the collapse pressure of offshore pipelines. To track the deformation history of the pipe, the entire process was simulated via finite element analysis using a solid element. A material model that considered both the Bauschinger effect and strain hardening was adopted. Various sizes of pipe cross-sections were simulated. As greater compression was applied during the sizing process, the strain hardening effect became more significant, so that the compressive yield strength was increased in the circumferential direction. The strain hardening effect was most prominent for a smaller diameter-to-thickness ratio (D/t), so that an increase in the collapse pressure could be obtained with a larger sizing ratio. Therefore, current design criteria for the collapse pressure recommended by Det Norske Verita (DNV) and API could be enhanced for a smaller D/t to consider the strain hardening effect during the sizing process.

Influence of the Strain Hardening of HDRBs in the Evaluation of the Seismic Response of a RC Base Isolated Structure

2012 ◽  
Vol 602-604 ◽  
pp. 1546-1554
Author(s):  
Donato Cancellara ◽  
Fabio de Angelis ◽  
Mario Pasquino
Keyword(s):  
Strain Hardening ◽  
Seismic Response ◽  
Base Isolation ◽  
Cyclic Behavior ◽  
Hysteretic Model ◽  
Isolation System ◽  
Limit Value ◽  
Hardening Effect ◽  
Base Isolation System ◽  
Rubber Bearings

In this paper we have analyzed the influence of the strain hardening behavior of High Damping Rubber Bearings (HDRBs) adopted for a base isolation system of a Reinforced Concrete (RC) isolated structure. For the modeling of the rubber isolators we have adopted an evolution of the Bouc-Wen’s hysteretic model taking into account the incremental hardening effect which appears when the shear strain of the HDRB exceeds the limit value around 100% usually adopted in design practice. The incremental hardening effect is sometimes neglected in the design but it is an important aspect because it ensures a seismic protection of the base isolated structure also in presence of exceptional seismic events for intensity or frequency content. In this paper we have highlighted the significant influence of this phenomenon in the seismic response of the isolated structure by reporting the cyclic behavior of a HDRB respectively neglecting and considering this aspect.

Strain-hardening effect of graphene on a chain of the chitosan for the tissue engineering

2012 ◽  
Author(s):  
O. E. Glukhova ◽  
I. V. Kirillova ◽  
A. S. Kolesnikova ◽  
E. L. Kossovich ◽  
G. N. Ten
Keyword(s):  
Tissue Engineering ◽  
Strain Hardening ◽  
Hardening Effect ◽  
A Chain

Stability with time of the strain hardening effect of constructional materials

1988 ◽  
Vol 20 (3) ◽  
pp. 358-362 ◽  
Author(s):  
V. Ya. Bash ◽  
L. M. Shkaraputa
Keyword(s):  
Strain Hardening ◽  
Hardening Effect
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