Deformation kinetics of the Ti-6Al-4V alloy at low temperatures

This work examines the dynamics of nonlinear large deformation of polymeric gels, and the kinetics of gel deformation is carried out through the coupling of existing hyperelastic theory for gels with kinetic laws for diffusion of small molecules. As finite element (FE) models for the transient swelling process is not available in commercial FE software, we develop a customized FE model/methodology which can be used to simulate the transient swelling process of hydrogels. The method is based on the similarity between diffusion and heat transfer laws by determining the equivalent thermal properties for gel kinetics. Several numerical examples are investigated to explore the capabilities of the present FE model, namely: a cube to study free swelling; one-dimensional constrained swelling; a rectangular block fixed to a rigid substrate to study swelling under external constraints; and a thin annulus fixed at the inner core to study buckling phenomena. The simulation results for the constrained block and one-dimensional constrained swelling are compared with available experimental data, and these comparisons show a good degree of similarity. In addition to this work providing a valuable tool to researchers for the study of gel kinetic deformation in the various applications of soft matter, we also hope to inspire works to adopt this simplified approach, in particular to kinetic studies of diffusion-driven mechanisms.

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Elastic Modulus of Pb/Sn Solder Joints in Microelectronics

Electronic and Photonic Packaging, Electrical Systems Design and Photonics, and Nanotechnology ◽

10.1115/imece2002-39632 ◽

2002 ◽

Author(s):

Cemal Basaran ◽

Jianbin Jiang

Keyword(s):

Grain Size ◽

Elastic Modulus ◽

Single Crystal ◽

Solder Alloy ◽

Ultrasonic Testing ◽

Heterogeneous Materials ◽

Testing Methods ◽

Nano Indentation ◽

Deformation Kinetics ◽

Kinetics Of

Young’s modulus (E) values published in literature for the eutectic Pb37/Sn63 and near eutectic Pb40/Sn60 solder alloy vary significantly. One reason for this discrepancy is different testing methods for highly rate sensitive heterogeneous materials, like Pb/Sn alloys, yield different results. In this paper, we study different procedures used to obtain the elastic modulus; analytically, by single crystal elasticity and experimentally by ultrasonic testing and Nano indentation. We compare these procedures and propose a procedure for elastic modulus determination. The deformation kinetics of the Pb/Sn solder alloys is discussed at the grain size level.

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Effect of Ca(OH)2/fly ash weight ratio on the kinetics of the reaction of Ca(OH)2/fly ash sorbents with SO2 at low temperatures

Chemical Engineering Science ◽

10.1016/j.ces.2004.06.031 ◽

2004 ◽

Vol 59 (21) ◽

pp. 4653-4655 ◽

Cited By ~ 3

Author(s):

Chiung-Fang Liu ◽

Shin-Min Shih ◽

Ren-Bin Lin

Keyword(s):

Fly Ash ◽

Low Temperatures ◽

Weight Ratio ◽

Ash Weight ◽

Kinetics Of

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Deformation Kinetics of Concrete

Fundamental Research on Creep and Shrinkage of Concrete ◽

10.1007/978-94-010-3716-7_3 ◽

1982 ◽

pp. 27-34 ◽

Cited By ~ 1

Author(s):

Jaap Luijerink

Keyword(s):

Deformation Kinetics ◽

Kinetics Of

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Comparative Survival and the Cold-Induced Gene Expression of Pathogenic and Nonpathogenic Vibrio Parahaemolyticus from Tropical Eastern Oysters during Cold Storage

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17061836 ◽

2020 ◽

Vol 17 (6) ◽

pp. 1836

Author(s):

Francisco Alarcón Elvira ◽

Violeta T. Pardío Sedas ◽

David Martínez Herrera ◽

Rodolfo Quintana Castro ◽

Rosa María Oliart Ros ◽

...

Keyword(s):

Low Temperatures ◽

Vibrio Parahaemolyticus ◽

Cold Shock ◽

Gene Expressions ◽

Reverse Transcription Pcr ◽

Naturally Occurring ◽

Gene Response ◽

Eastern Oysters ◽

Kinetics Of

Expression of the regulatory stress rpoS gene controls the transcription of cspA genes, which are involved in survival and adaptation to low temperatures. The purpose of this study was to assess the growth kinetics of naturally occurring V. parahaemolyticus in shellstock oysters and in vitro and the cold-shock-induced expression of the rpoS and cspA gene response in vitro during postharvest refrigeration. Naturally contaminated eastern oysters (Crassostrea virginica) and pathogenic (Vp-tdh) and nonpathogenic (Vp-tlh) isolates were stored at 7 ± 1 °C for 168 h and 216 h, respectively. The regulatory stress (rpos) and cold-shock (cspA) gene expressions were determined by reverse transcription PCR. At 24 h, the (Vp-tdh) strain grew faster (p < 0.05) than the (Vp-tlh) strain in oysters (λ = 0.33, 0.39, respectively) and in vitro (λ = 0.89, 37.65, respectively), indicating a better adaptation to cold shock for the (Vp-tdh) strain in live oysters and in vitro. At 24 h, the (Vp-tdh) strain rpoS and cspA gene expressions were upregulated by 1.9 and 2.3-fold, respectively, but the (Vp-tlh) strain rpoS and cspA gene expressions were repressed and upregulated by −0.024 and 1.9-fold, respectively. The V. parahaemolyticus strains that were isolated from tropical oysters have adaptive expression changes to survive and grow at 7 °C, according to their virulence.

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Non-Linear Large Deformation Kinetics of Polymeric Gel

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.535-536.338 ◽

2013 ◽

Vol 535-536 ◽

pp. 338-341 ◽

Cited By ~ 2

Author(s):

William Toh ◽

Teng Yong Ng ◽

Zi Shun Liu

Keyword(s):

Transient Heat Conduction ◽

Element Model ◽

Initial State ◽

Linear Deformation ◽

Deformation Kinetics ◽

Polymeric Gels ◽

Free Swelling ◽

Non Linear ◽

Kinetics Of ◽

Fixed Cylinder

The transient swelling process of polymeric gels is studied and a finite element model is introduced to simulate the phenomena based on existing hyperelastic theory for inhomogeneous swelling of gels and analogies made to transient heat conduction analysis. Examples of free swelling of a cube and a fixed cylinder were investigated, showing the highly non-linear deformation present during transition from the initial state to equilibrium.

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