Ratchetting Deformation Analysis of Modified 9Cr-1Mo Steel. III. Modeling of Temperature Dependence of Ratchetting Deformation Behavior of Modified 9Cr-1Mo Steel.

Deformation mechanisms of Mg89Zn4Y7 (at.%) extruded alloy, which is mostly composed of LPSO-phase, was investigated focusing on their temperature dependence. The yield stress of as-extruded alloy showed extremely high value of ~480 MPa at RT, but it largely decreased to ~130 MPa at 300 °C. The decreasing rate of the yield stress could be significantly reduced, however, by the annealing of specimen at 400 °C, by suppressing the microyielding which is considered to occur related by the grain boundary sliding in restricted regions. The yield stress of the annealed specimens with random textures could be estimated by the Hall-Petch relationship by regarding the length of long-axis of plate-like grains as a grain size between RT and 300 °C. The yield stress of the annealed specimens maintained high values even at 200°C, but it also showed large decreases at 300 °C.

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Design and Compression Deformation Analysis of an Innovational Structure with Auxetic Effect

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.427-429.99 ◽

2013 ◽

Vol 427-429 ◽

pp. 99-103 ◽

Cited By ~ 1

Author(s):

Zhao Yang Ge ◽

Hong Hu

Keyword(s):

Deformation Behavior ◽

Vertical Direction ◽

Honeycomb Structure ◽

Bending Stiffness ◽

Compression Testing ◽

Deformation Analysis ◽

Compression Deformation ◽

The Difference ◽

Poissons Ratio

An innovational structure with auxetic effect was designed from inspiration of a re-entrant honeycomb structure firstly proposed by Gibson et.al. In the newly designed structure, yarns were used to replace the straight and tilted ribs of re-entrant honeycomb structure in order to achieve negative Poissons ratio. The compression testing was carried out in the vertical direction of the structure using an INSTRON 5566 tester to understand its deformation behavior. The results show that the difference in bending stiffness between the warp and weft yarns is the main reason for getting negative Poissons ratio of the structure.

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Temperature Dependence of Loading-Unloading Deformation Behavior of Thermoplastic PA6

The Proceedings of the Materials and Mechanics Conference ◽

10.1299/jsmemm.2016.os08-21 ◽

2016 ◽

Vol 2016 (0) ◽

pp. OS08-21

Author(s):

Yuhi SATO ◽

Masamichi KAWAI

Keyword(s):

Temperature Dependence ◽

Deformation Behavior ◽

Unloading Deformation

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Temperature dependence of deformation behavior in a Co–Al–W-base single crystal superalloy

Materials Science and Engineering A ◽

10.1016/j.msea.2014.09.074 ◽

2015 ◽

Vol 620 ◽

pp. 36-43 ◽

Cited By ~ 16

Author(s):

L. Shi ◽

J.J. Yu ◽

C.Y. Cui ◽

X.F. Sun

Keyword(s):

Single Crystal ◽

Temperature Dependence ◽

Deformation Behavior ◽

Single Crystal Superalloy

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A Multiscale Deformation Analysis for Mono-Crystalline Copper under Dynamic Uniaxial Tension

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.32.241 ◽

2008 ◽

Vol 32 ◽

pp. 241-244 ◽

Cited By ~ 2

Author(s):

Yuan Tong Gu ◽

Prasad K.D.V. Yarlagadda

Keyword(s):

Strain Rate ◽

Uniaxial Tension ◽

Deformation Behavior ◽

Md Simulation ◽

Multiscale Simulation ◽

Strain Rate Range ◽

Deformation Analysis ◽

Specimen Length ◽

Cross Sectional ◽

Cross Sectional Size

This paper presents a concurrent multiscale study for the deformation mechanism of monocrystalline copper under dynamic uniaxial tension. The multiscale simulation is based on the coupled meshless and molecular dynamic (MD) method. Using it, the size of computational model can be extended to a large dimension (in micrometer) with an atomistic resolution. The pure MD simulation is difficult to reach this microscopic dimension because the number of atoms will be too large. In this study, it has been revealed that the deformation behavior and mechanism of the copper is sensitive to its size, geometry, and loading strain rate. In addition, the Young’s modulus is found to be independent of the cross-sectional size and the strain rate range considered in this study. On the other hand, the yield stress decreases with specimen length and increases with the loading strain rate.

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