Temperature effects and temperature-dependent constitutive model of magnetorheological fluids

2021 ◽  
Author(s):  
Haopeng Li ◽  
Ilari Jönkkäri ◽  
Essi Sarlin ◽  
Fei Chen
Keyword(s):  
Constitutive Model ◽  
Temperature Effects ◽  
Magnetorheological Fluids ◽  
Temperature Dependent

scholarly journals A General Temperature-Dependent Stress–Strain Constitutive Model for Polymer-Bonded Composite Materials

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1393
Author(s):  
Xiaochang Duan ◽  
Hongwei Yuan ◽  
Wei Tang ◽  
Jingjing He ◽  
Xuefei Guan
Keyword(s):  
Composite Materials ◽  
Constitutive Model ◽  
Model Parameters ◽  
Temperature Dependent ◽  
Stress Strain ◽  
Proposed Model ◽  
Single Temperature ◽  
Testing Data ◽  
Bonded Composite ◽  
Tension And Compression

This study develops a general temperature-dependent stress–strain constitutive model for polymer-bonded composite materials, allowing for the prediction of deformation behaviors under tension and compression in the testing temperature range. Laboratory testing of the material specimens in uniaxial tension and compression at multiple temperatures ranging from −40 ∘C to 75 ∘C is performed. The testing data reveal that the stress–strain response can be divided into two general regimes, namely, a short elastic part followed by the plastic part; therefore, the Ramberg–Osgood relationship is proposed to build the stress–strain constitutive model at a single temperature. By correlating the model parameters with the corresponding temperature using a response surface, a general temperature-dependent stress–strain constitutive model is established. The effectiveness and accuracy of the proposed model are validated using several independent sets of testing data and third-party data. The performance of the proposed model is compared with an existing reference model. The validation and comparison results show that the proposed model has a lower number of parameters and yields smaller relative errors. The proposed constitutive model is further implemented as a user material routine in a finite element package. A simple structural example using the developed user material is presented and its accuracy is verified.

scholarly journals Application of Temperature-Dependent Fluorescent Dyes to the Measurement of Millimeter Wave Absorption in Water Applied to Biomedical Experiments

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Nataliia Kuzkova ◽  
Oleksandr Popenko ◽  
Andrey Yakunov
Keyword(s):  
Millimeter Wave ◽  
Millimeter Waves ◽  
Temperature Effects ◽  
Fluorescent Dyes ◽  
Organic Dyes ◽  
Temperature Dependent ◽  
Wave Absorption ◽  
Biological Objects ◽  
Novel Method ◽  
Local Temperature Increase

Temperature sensitivity of the fluorescence intensity of the organic dyes solutions was used for noncontact measurement of the electromagnetic millimeter wave absorption in water. By using two different dyes with opposite temperature effects, local temperature increase in the capillary that is placed inside a rectangular waveguide in which millimeter waves propagate was defined. The application of this noncontact temperature sensing is a simple and novel method to detect temperature change in small biological objects.

Incubation temperature effects on hatchling growth and metabolic rate in the African spurred tortoise, Geochelone sulcata

2009 ◽  
Vol 87 (1) ◽  
pp. 64-72 ◽  
Author(s):  
Day B. Ligon ◽  
Joseph R. Bidwell ◽  
Matthew B. Lovern
Keyword(s):  
Metabolic Rate ◽  
Conversion Efficiency ◽  
Temperature Effects ◽  
Null Hypothesis ◽  
Incubation Temperature ◽  
Resting Metabolic Rate ◽  
Temperature Dependent ◽  
Temperature Preference ◽  
Mass Conversion ◽  
Competing Hypotheses

We tested competing hypotheses regarding the persistence of temperature-dependent sex determination (TSD) in the African spurred tortoise (Geochelone sulcata (Miller, 1779)), by measuring the effects of incubation temperature (Tinc) on a suite of physiological and behavioral endpoints, including resting metabolic rate, yolk-to-tissue conversion efficiency, posthatching growth, and temperature preference. Correlations of these variables with Tinc could lend support to the hypothesis that TSD persists owing to sex-specific benefits of development at specific temperatures, whereas absence of Tinc effects support the null hypothesis that TSD persists simply because selection favoring alternate sex determining mechanisms is weak or absent. The metabolic rate Q10 value exhibited temporal variation and was higher immediately after hatching compared with 40 or 100 days posthatching, and mass conversion efficiency varied among clutches. Incubation temperature correlated inversely with duration of embryonic development, but did not influence yolk conversion efficiency, growth, or resting metabolic rate. Thus, our results provide little evidence indicating contemporary benefits of TSD, suggesting that TSD in G. sulcata is no longer evolutionarily adaptive but persists because selection against it and in favor of other sex-determining mechanisms is weak, or that TSD is an adaptive trait but for reasons not elucidated by this study.

scholarly journals MODIFIED INTEGRATION ALGORITHM IN THE STRAIN SPACE FOR RATE AND TEMPERATURE DEPENDENT ELASTO-PLASTIC CONSTITUTIVE MODEL

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1243-1248 ◽  
Author(s):  
SANG-SOON CHO ◽  
HOON HUH
Keyword(s):  
Constitutive Model ◽  
Accuracy Assessment ◽  
Constitutive Relations ◽  
Fem Analysis ◽  
Temperature Dependent ◽  
Model Accuracy ◽  
Order Accuracy ◽  
Integration Algorithm ◽  
Strain Space ◽  
Raphson Method

This paper is concerned with modified integration algorithm in the strain space for rate and temperature dependent elasto-plastic constitutive relations in order to obtain more accurate results in numerical implementation. The proposed algorithm adopts both the 2-stage Lobatto IIIA with second-order accuracy and the iteration procedure using the Newton–Raphson method to enfoce consistency at the end of the step. The algorithm enables to consider the convective stress rates on the yield surface in the strain space in the numerical integration of the constitutive model. Accuracy assessment using the isoerror maps and FEM analysis of the adiabatic shear band is carried out in order to demonstrate the accuracy of the proposed algorithm.

Temperature-dependent material properties of the components of magnetorheological fluids

2014 ◽  
Vol 49 (24) ◽  
pp. 8459-8470 ◽  
Author(s):  
Daoming Wang ◽  
Bin Zi ◽  
Yishan Zeng ◽  
Youfu Hou ◽  
Qingrui Meng
Keyword(s):  
Material Properties ◽  
Magnetorheological Fluids ◽  
Temperature Dependent

Scaling temperature dependent rheology of magnetorheological fluids

2015 ◽  
Vol 117 (17) ◽  
pp. 17C751 ◽  
Author(s):  
Stephen G. Sherman ◽  
Louise A. Powell ◽  
Andrew C. Becnel ◽  
Norman M. Wereley
Keyword(s):  
Magnetorheological Fluids ◽  
Temperature Dependent

scholarly journals A strain-rate and temperature dependent constitutive model for BCC metals incorporating non-Schmid effects: Application to tantalum–tungsten alloys

2014 ◽  
Vol 62 ◽  
pp. 93-104 ◽  
Author(s):  
Marko Knezevic ◽  
Irene J. Beyerlein ◽  
Manuel L. Lovato ◽  
Carlos N. Tomé ◽  
Andrew W. Richards ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Strain Rate ◽  
Temperature Dependent ◽  
Tungsten Alloys ◽  
Bcc Metals

scholarly journals Modeling Temperature Effects on Population Density of the Dengue Mosquito Aedes aegypti

Insects ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 393 ◽  
Author(s):  
Fadoua El Moustaid ◽  
Leah Johnson
Keyword(s):  
Dynamical System ◽  
Population Density ◽  
Aedes Aegypti ◽  
Temperature Effects ◽  
Adult Population ◽  
System Model ◽  
Life Stages ◽  
Mosquito Density ◽  
Temperature Dependent ◽  
Over Time

Mosquito density plays an important role in the spread of mosquito-borne diseases such as dengue and Zika. While it remains very challenging to estimate the density of mosquitoes, modelers have tried different methods to represent it in mathematical models. The goal of this paper is to investigate the various ways mosquito density has been quantified, as well as to propose a dynamical system model that includes the details of mosquito life stages leading to the adult population. We first discuss the mosquito traits involved in determining mosquito density, focusing on those that are temperature dependent. We evaluate different forms of models for mosquito densities based on these traits and explore their dynamics as temperature varies. Finally, we compare the predictions of the models to observations of Aedes aegypti abundances over time in Vitòria, Brazil. Our results indicate that the four models exhibit qualitatively and quantitatively different behaviors when forced by temperature, but that all seem reasonably consistent with observed abundance data.

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