Effect of temperature on the mechanical response of thermo-viscoelastic asphalt pavements

2012 ◽  
Vol 30 ◽  
pp. 574-582 ◽  
Author(s):  
Flavio V. Souza ◽  
Leandro S. Castro
Keyword(s):  
Mechanical Response ◽  
Asphalt Pavements ◽  
Effect Of Temperature

Effect of temperature on damage mechanisms and mechanical behaviour of an acrylic-thermoplastic-matrix and glass-fibre-reinforced composite

2020 ◽  
Vol 54 (27) ◽  
pp. 4269-4282
Author(s):  
E Boissin ◽  
C Bois ◽  
J-C Wahl ◽  
T Palin-Luc
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Polymer Matrix ◽  
Mechanical Response ◽  
Polymer Matrix Composites ◽  
Effect Of Temperature ◽  
Matrix Composites ◽  
Service Temperature ◽  
Damage Mechanisms ◽  
Temperature Range

The mechanical response of polymer matrix composites exhibits a temperature dependency even if the service temperature range is lower than the glass transition temperature of the polymer matrix. This dependency is mainly due to the temperature effect on the mechanical behaviour of the polymer matrix. However, the micro- and meso-structures driving the composite anisotropy and local stress distribution play an essential role regarding the effect of temperature on damage mechanisms specific to reinforced polymers. There are few data in the literature on the sensitivity to temperature of damage mechanisms and scenarios of polymer matrix composites regardless of loading type. In this paper, after a synthetic literature review of the effect of temperature on polymers and polymer composites, several complementary tests are proposed to analyse the temperature effect on damage mechanisms undergone by laminated composites under in-plane quasi static loadings. These tests are applied to an acrylic-thermoplastic composite reinforced by glass fibres in its service temperature range of –20℃ to 60℃. The results show that the testing temperature has a significant impact on the mechanical response and damage mechanisms of the composite material in the selected temperature range, which is markedly lower than the glass transition temperature (around 100℃). While the temperature rise generates a gradual decrease in matrix stiffness and strength, the increase in matrix ductility associated to the stress heterogeneity in the composite microstructure produces a rise in the transverse cracking threshold and removes this damage mode during quasi-static tensile tests when the temperature shifts from 15℃ to 40℃.

Analysis of the compression behavior of an E-glass composite pipe after aging in water

2019 ◽  
Vol 28 (8-9) ◽  
pp. 523-529
Author(s):  
José RM d’Almeida ◽  
Leonardo M Ottolini
Keyword(s):  
Mechanical Response ◽  
Damage Parameter ◽  
Effect Of Temperature ◽  
Glass Composite ◽  
Composite Surface ◽  
Compression Behavior ◽  
Reinforced Composite ◽  
Temperature And Pressure ◽  
Composite Pipes ◽  
Surface Gloss

E-glass-reinforced composite pipes are being increasingly used in petrochemical facilities. After years of contact with the fluid being transported, the mechanical integrity of the pipes can be compromised, and their failure mode can be altered. This work analyzes the effect of temperature and pressure on the compressive behavior of an E-glass pipe after exposure to water. The results indicate that temperature causes more damage than pressure on the mechanical response of the composite. A macroscopic damage parameter quantified the effect on the mechanical behavior of the composite. Surface gloss changes were also correlated with the effects caused by aging.

Temperature Dependence of Magneto-Mechanical Response in Ni-Mn-Ga Magnetic Shape Memory Alloys

2004 ◽  
Vol 855 ◽  
Author(s):  
Leon M. Cheng ◽  
Garrett Landry ◽  
hannon P. Farrell ◽  
Rosaura Ham-Su ◽  
Calvin V. Hyatt
Keyword(s):  
Magnetic Field ◽  
Mechanical Response ◽  
Anisotropy Constant ◽  
Systematic Investigation ◽  
Critical Magnetic Field ◽  
Effect Of Temperature ◽  
Magnetic Shape Memory ◽  
Magnetic Anisotropy Constant ◽  
Maximum Magnetic Field ◽  
Magnetic Forces

ABSTRACTIn this work, a systematic investigation is being carried out on single crystals of Ni47.8Mn27.5Ga24.7 alloy to determine the effect of temperature on the magneto-mechanical behaviour of the Ni-Mn-Ga alloys. Repeated mechanical and magnetic forces have been applied at various temperatures below the martensite finish (MF) temperature. It has been observed that twinning start and finish stresses, critical magnetic field and maximum magnetic-field-induced strain all remain almost constant within about 20K below MF and then change substantially at lower temperatures. Eventually no magnetic-field-induced strain can be observed at temperatures below 262K. It is proposed that although magnetic anisotropy constant increases with decreasing temperature, it is not sufficient to overcome the increasing twinning stresses required for twin boundary motion at lower temperatures.

scholarly journals Micromechanical interpretation of thermo-plastic behaviour of clays

2020 ◽  
Vol 205 ◽  
pp. 09003
Author(s):  
Angela Casarella ◽  
Alessandro Tarantino ◽  
Alice Di Donna
Keyword(s):  
Mechanical Behaviour ◽  
Mechanical Response ◽  
Clay Mineralogy ◽  
Effect Of Temperature ◽  
Geothermal Systems ◽  
Volume Changes ◽  
Thermally Induced ◽  
Elastoplastic Constitutive Model ◽  
Induced Changes ◽  
Constitutive Parameters

The effect of temperature on mechanical behaviour of clay-based geomaterials is relevant in a number of geotechnical applications (e.g. low enthalpy geothermal systems and energy geostructures, nuclear waste disposal, and heating in rapid shear deformation). Mechanical response of (saturated) clays upon heating is not always intuitive as volume changes may occur due to both thermal expansion of clay constituents and temperature-induced changes of clay microstructure. This paper first revisits the macroscopic thermally-induced mechanical behaviour of saturated clays available in the literature via an advanced thermo-elastoplastic constitutive model and then elucidates the dependence on clay mineralogy of the two key parameters of the model (mechanical hardening and thermal softening respectively) by inspecting differences in clay inter-particle electro-chemical forces occurring in kaolinitic, illitic, and smectitic clays. The micromechanically-based interpretation of constitutive parameters can serve as a guidance for soil parameter selection in the design of energy geostructures.

Effect of Distance along the Built Axis on Mechanical Properties and Microstructure in Al10SiMg SLM Alloy

2021 ◽  
Vol 1016 ◽  
pp. 309-314
Author(s):  
Emanuela Cerri ◽  
Emanuele Ghio
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Mechanical Response ◽  
Property Values ◽  
Solution Treatment ◽  
Effect Of Temperature ◽  
Laser Melting ◽  
Precipitation Behaviour ◽  
Scanning Electron

It is know that rapid solidification promotes solid solubility larger than at equilibrium, in association with very fine grains and eutectic microstructures. Consequently, the precipitation behaviour in additive manufacturing alloys can be quite different from that of alloys quenched after a solution treatment and aged. In this study, Al10SiMg samples were produced by Selective Laser Melting (SLM) while keeping the table at 150°C continuously during the job. The effect of temperature on mechanical properties of the samples was investigated as function of time or distance along the built axis (300 mm). The hardness behaviour was measured by micro Vickers indentations and significant inhomogeneities were detected along the built axes. These results were also confirmed by tensile property values. The tensile strength varied of 80 MPa from the bottom to the top of the sample. The microstructure was investigated by optical and scanning electron microscopy; the observations showed variable precipitate distributions that justify the mechanical response along the built axis.

Finite Element Model for Investigating the Thermo-Electro-Mechanical Response of Inhomogeneously Deforming Dielectric Elastomer Actuators

2021 ◽  
Author(s):  
Atul Kumar Sharma ◽  
Aman Khurana ◽  
Manish M. Joglekar
Keyword(s):  
Finite Element ◽  
Mechanical Response ◽  
Element Model ◽  
Dielectric Elastomer ◽  
Material Behavior ◽  
Effect Of Temperature ◽  
Dielectric Elastomer Actuators ◽  
Bending Actuator ◽  
Electromechanical Responses ◽  
Electromechanical Performance

Among the available soft active materials, Dielectric elastomers (DEs) possess the capability of achieving the large actuation strain under the application of high electric field. The material behavior of such elastomers is affected significantly by the change in temperature. This paper reports a 3-D finite element framework based on the coupled nonlinear theory of thermo-electro-elasticity for investigating the thermal effects on the electromechanical performance of inhomogeneously deforming dielectric elastomer actuators (DEAs). The material behavior of the actuator is modeled using the neo-Hookean model of hyperelasticity with temperature dependent shear modulus. An in-house computational code is developed to implement the coupled finite element framework. Firstly, the accuracy of the developed FE code is verified by simulating the temperature effects on the actuation response and pull-in instability of the benchmark homogeneously deforming planar DE actuator. Further, the influence of temperature on the electromechanical responses of complex bi-layered bending actuator and buckling pump actuator involving inhomogeneous deformation is investigated. The numerical framework and the associated inferences can find their potential use in addressing the effect of temperature in the design of electro-active polymer based actuators.

scholarly journals The Effect of Temperature and Composition to the Rheological Properties of Asphalt Pavements

2008 ◽  
Vol 589 ◽  
pp. 85-91 ◽  
Author(s):  
László A. Gömze ◽  
Róbert Géber ◽  
Judit Csányi Tamásné
Keyword(s):  
Rheological Properties ◽  
Mechanical Model ◽  
Building Materials ◽  
Raw Materials ◽  
Asphalt Mixtures ◽  
Asphalt Pavements ◽  
Effect Of Temperature ◽  
Mineral Raw Materials ◽  
Low Viscosity ◽  
The Government

Ceramics, concretes and asphalt-mixtures are the most popular building materials in Hungary, because of the highway programme of the government. In spite of their large popularity, some of the mechanical properties of ceramics, concretes and asphalts are not investigated enough till today. Particularly, there is no mechanical model usable to understand and explain the rheological behaviours of these materials with different compositions of mineral raw materials. It is well known, that the viscosity of viscous materials, viscoelastic materials, and viscoplastic materials dynamically decreases, as the temperature increases. The decrease of viscosity by leaps and bounds could be extremely dangerous in case of asphalt pavements in the range of 55 – 75 °C, due to the crossing of cars on the low viscosity pavements which suffer inelastic deformation, as a result. Using a Rheo-tribometer instrument developed by L. A. Gömze and others, the authors have investigated and tested asphalt mixtures with different composition of mineral raw materials, and would like to reveal and review the dependence of the rheological properties of these pavements against the temperature, and the intensity of the dependence.

Mechanical Response of T300/BMP350 Composites under Tensile Loading at Room and Elevated Temperatures

2014 ◽  
Vol 1035 ◽  
pp. 138-143
Author(s):  
Ping Zhou ◽  
Pu Rong Jia ◽  
Wen Ge Pan
Keyword(s):  
High Temperature ◽  
Failure Modes ◽  
Elevated Temperatures ◽  
Mechanical Response ◽  
Effect Of Temperature ◽  
Matrix Composites ◽  
Stress Strain ◽  
Damage And Failure ◽  
Different Temperatures ◽  
Static Tensile

In this paper, the effect of elevated temperature on the behavior of carbon fiber-reinforced T300/BMP350 unidirectional laminates was studied by loading static tensile on 0°, 90°and ±45° lay-up. The stress-strain relationships of the laminates under different temperatures were obtained. The effect of temperature on the mechanical properties of materials was systematically studied. The damage and failure mechanisms of the material were studied by analyzing the material stress-strain curves and the failure modes. Results show that the T300/BMP350 polyimide matrix composites have a strong resistance to high temperature. For 0° and 90° lay-up, the retentions of tensile strength and modulus are more than 80% and 50%, respectively. High temperature has little effect on the material failure modes. Finally, based on the test results, an empirical formula which relates strength and temperature of the material was fitted.

Effects of Temperature and Volume Agglomerate Fraction on Mechanical Response of PEMFC Electrodes

2014 ◽  
Vol 548-549 ◽  
pp. 379-382 ◽  
Author(s):  
Yang Xiao ◽  
Chong Du Cho
Keyword(s):  
Mechanical Properties ◽  
Fuel Cell ◽  
Yield Stress ◽  
Mechanical Response ◽  
Pem Fuel Cell ◽  
Effect Of Temperature ◽  
Electrode Layer ◽  
Foam Structure ◽  
Durability Analysis ◽  
Effects Of Temperature

To deal with the durability analysis of PEM fuel cell, it is necessary to carry out a further understanding of each component response, especially each layer of the MEA. So the main purpose of this paper is to understand the mechanical properties of electrode layer and find out the effect of temperature and the content of catalyst particles on the electrode yield stress. To overcome the experimental limitations, numerical method is used here. A 3-phase model of the electrode is built, which includes a user-defined material with catalyst particles. Due to the porosity of the electrode, the user-defined material is defined as a nafion ionomer glassy constitutive model by bringing in the effect of foam structure. Catalyst agglomerate particles are assumed as isotropic elastic spheres with relatively high Young’s modulus. The yield stress is extracted from the simulation, and the influences of temperature and agglomerate fraction on it are discussed.

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