Uniaxial Compression Creep Prediction of Asphalt Mixture Using the Eshelby Equivalent Inclusion Method

2014 ◽  
Vol 1061-1062 ◽  
pp. 410-413 ◽  
Author(s):  
Jun Wu
Keyword(s):  
Uniaxial Compression ◽  
Asphalt Mixture ◽  
Stress Conditions ◽  
Creep Tests ◽  
Two Phase ◽  
Asphalt Mastic ◽  
Compression Creep ◽  
Equivalent Inclusion Method ◽  
The Matrix ◽  
Constitutive Parameters

Asphalt mixture was simply treated as a two-phase composite, in which coarse aggregates are embedded into asphalt mastic matrix. According to the elastic-viscoelastic correspondence principle, an elastic micromechanical method is extended for predicting viscoelastic properties of asphalt mixture, which is simply treated as elastic coarse aggregate inclusions periodically and isotropically embedded into viscoelastic asphalt mastic matrix. The Burgers model is adopted for characterizing the matrix mechanical behavior, so that the homogenized relaxation modulus of asphalt mixture in compression creep is derived. After a series of uniaxial compression creep tests are performed on asphalt mastic in different stress conditions in order to determine the matrix constitutive parameters, the presented framework is validated by comparison with the experiment, and then some predictions to uniaxial compression creep behavior of asphalt mixture in different stress conditions are given.

scholarly journals Study on Creep Behavior Of Asphalt Mixture Based on Discrete Element Method

2020 ◽  
Vol 15 (4) ◽  
pp. 174-195
Author(s):  
Youlin Ye ◽  
Yazhen Sun ◽  
Lin Gao ◽  
Zhuang Ma ◽  
Xingwei Xue
Keyword(s):  
Uniaxial Compression ◽  
Creep Behaviour ◽  
Viscoelastic Model ◽  
Asphalt Mixture ◽  
Discrete Element ◽  
Creep Tests ◽  
Burger Model ◽  
Air Voids ◽  
Compression Creep ◽  
Asphalt Mortar

A three-dimensional (3D) microstructure-based discrete element (DE) model was developed to study the creep behaviour of high viscoelastic asphalt sand (HVAS) with the uniaxial compression creep tests. The three-point bending creep tests of asphalt mortar were carried out in order to obtain the parameters of the Burger model, to determine the transformation method of macroscopic parameters and microscopic parameters of the model in theory, to obtain the parameters used in the discrete element model, and then establish the discrete element analysis model for the asphalt mixture. A 3D-DE digital specimen was composed of coarse aggregates, asphalt mortar and air voids, which could also take gradation, irregular shape, random distribution of aggregate and air voids into consideration, and the boundary conditions of the model were set through the simulation of the uniaxial compression creep tests. An accurate and extensive mapping model of HVAS was built by 3D-PFC (Particle Flow Code), which can provide a simple alternative to the laboratory tests. This method can simulate a series of numerical examples based on different stress levels, coarse aggregate homogenizations, mortar homogenizations and temperatures in a single factor method. Comparison of results of laboratory and numerical tests shows that the 3D-PFC-viscoelastic model can reflect the creep mechanical behaviour of asphalt mixture accurately. It provides the theoretical basis and auxiliary means for analysing the mechanical properties of asphalt mixtures using PFC software. The research on creep behaviour of the asphalt mixture by numerical simulation opens up a new way for the research on creep behaviour of the asphalt mixture, it is of considerable theoretical value and has broad application prospects.

scholarly journals Does the Permanent Creep-Rate of Polycrystalline Ice Increase with Crystal Size?

1980 ◽  
Vol 25 (91) ◽  
pp. 151-158 ◽  
Author(s):  
Paul Duval ◽  
Hugues Le Gac
Keyword(s):  
Grain Size ◽  
Creep Rate ◽  
Uniaxial Compression ◽  
Crystal Size ◽  
Size Range ◽  
Transient Creep ◽  
Creep Tests ◽  
Compression Creep ◽  
Polycrystalline Ice

AbstractUniaxial compression creep tests were performed on artificial and natural polycrystalline ices at temperatures near –7°C. The grain-size range investigated was from 1 to 10 mm. Contrary to previous results, the permanent creep-rate was not found to increase with crystal size. Only the transient creep appears to be sensitive to variations in crystal size.

Microstructure and Mechanical Properties of Ni3Al-Based Alloys Reinforced with Particulates

1990 ◽  
Vol 213 ◽  
Author(s):  
C. G. Mckamey ◽  
C. A. Carmichael
Keyword(s):  
Mechanical Properties ◽  
Hot Extrusion ◽  
Matrix Composites ◽  
Matrix Interface ◽  
Creep Tests ◽  
Compression Creep ◽  
The Matrix ◽  
Simple Compression ◽  
Al Matrix Composites ◽  
Hot Hardness

ABSTRACTHot-extrusion was used to produce Ni3Al-based alloys to which 10 vol% TiN, NbC, HfO2, or HfN was added for reinforcement. The TiN, NbC, and HfO2 particulates produced Ni3Al-matrix composites in which no reaction was noted at the particle-matrix interface. However, the addition of HfN resulted in extensive reaction in which the hafnium appeared to diffuse into the matrix. Microstructures of this alloy showed a complex array of phases and voids where the HfN particles are presumed to have been originally. Hot hardness, compression, and compression creep tests were performed on specimens cut from the extruded bar of each alloy. No significant strengthening was observed for the alloys containing TiN, NbC, or HfO2. However the HfN-containing alloy did show significant strengthening in simple compression and compression creep. This presentation will include microstructures and the results of the mechanical properties tests.

Study on Limestone Uniaxial Compression Creep Test with Chemistry–Mechanics Coupling Action

2011 ◽  
Vol 378-379 ◽  
pp. 453-456
Author(s):  
An Nan Jiang ◽  
Shu Ai Jiang
Keyword(s):  
Uniaxial Compression ◽  
Ph Value ◽  
Underground Water ◽  
Micro Structure ◽  
Corrosion Prevention ◽  
Creep Tests ◽  
Compression Creep ◽  
Creep Effect ◽  
Rock Creep ◽  
Erosion Effect

Considering the erosion effect of underground water deteriorate the micro structure of rock which results in the time effect of rock deform, the paper developed a uniaxial compression equipment for rock creep under chemical and stress coupling action. It adopts good corrosion prevention design, can conveniently test the rock uniaxial compression creep effect with erosion. Take limestone as study object, the paper carried out uniaxial compression creep tests with different PH environment. Compared the results of different tests and found that limestone has obvious creep effect in acid solution, the smaller the PH value is, the greater the creep deform is. For the same test specimen, the creep deform of primary stage is larger than that of later stage. In each level load, the creep velocity decreases along with the time increasing. Analyzed result shows that the equipment has provided basement for studying the rock creep mechanism with chemistry and stress interaction.

scholarly journals Does the Permanent Creep-Rate of Polycrystalline Ice Increase with Crystal Size?

1980 ◽  
Vol 25 (91) ◽  
pp. 151-158 ◽  
Author(s):  
Paul Duval ◽  
Hugues Le Gac
Keyword(s):  
Grain Size ◽  
Creep Rate ◽  
Uniaxial Compression ◽  
Crystal Size ◽  
Size Range ◽  
Transient Creep ◽  
Creep Tests ◽  
Compression Creep ◽  
Polycrystalline Ice

AbstractUniaxial compression creep tests were performed on artificial and natural polycrystalline ices at temperatures near –7°C. The grain-size range investigated was from 1 to 10 mm. Contrary to previous results, the permanent creep-rate was not found to increase with crystal size. Only the transient creep appears to be sensitive to variations in crystal size.

Three-Dimensional Numerical Evaluation of Influence Factors of Mechanical Properties of Asphalt Mixture

2012 ◽  
Vol 28 (3) ◽  
pp. 569-578 ◽  
Author(s):  
S. F. Yang ◽  
X. H. Yang ◽  
A. Y. Yin ◽  
W. Jiang
Keyword(s):  
Asphalt Mixture ◽  
Three Dimensional ◽  
Influence Factors ◽  
Maxwell Model ◽  
Two Phase ◽  
Asphalt Mastic ◽  
Aggregate Distribution ◽  
Coarse Aggregates ◽  
Fine Aggregates ◽  
Average Size

AbstractHeterogeneous asphalt mixture is treated as a two-phase composite consisting of asphalt mastic, namely a mixture of asphalt and fine aggregates, and coarse aggregates in this paper. A novel three-dimensional (3D) random modeling frame for asphalt mixture is developed, and as its applications, some numerical samples involving various polyhedric coarse aggregates with given gradations are generated. Viscoelastic asphalt mastic is simply characterized by the generalized Maxwell model whose parameters are determined by fitting the uniaxial compressive creep experimental data of asphalt mastic. After validation, the 3D random numerical samples are used to perform a series of numerical experiments in order to evaluate the influences of coarse aggregate distribution, content, average size, size deviation, shape and loading rate on the mechanical behaviors of asphalt mixture quantitatively. Finally, some important conclusions are given.

Thermal Expansion Coefficient Prediction of Asphalt Mixture with the Eshelby Equivalent Inclusion Theory

2014 ◽  
Vol 584-586 ◽  
pp. 1071-1075
Author(s):  
Jun Wu
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Asphalt Mixture ◽  
Theoretical Framework ◽  
Two Phase ◽  
Asphalt Mastic ◽  
Equivalent Inclusion ◽  
Inclusion Theory ◽  
Effective Thermal Expansion

Asphalt mixture was considered as a two-phase composite, in which coarse aggregates are embedded into asphalt mastic matrix, namely a mix of fine aggregates and asphalt, so that a theoretical framework was proposed to correlate its effective thermal expansion coefficient with its components and microstructures based on the Eshelby equivalent inclusion theory. A four-parameter model with the experimentally determined parameters was used to characterize the viscoelastic constitutive behavior of asphalt mastic. The thermal expansion coefficient prediction of asphalt mixture was conducted and compared with the predictions by the sparse method and the self-consistent method. It was revealed that the prediction from the proposed theoretical framework is reasonable.

scholarly journals Quasi-Static Failure Criteria for Concrete / Quasi-Statyczne Kryteria Zniszczenia Betonu

2010 ◽  
Vol 56 (2) ◽  
pp. 123-154 ◽  
Author(s):  
T. Jankowiak ◽  
T. Łodygowski
Keyword(s):  
Uniaxial Compression ◽  
Plane Stress ◽  
Material Model ◽  
Failure Criteria ◽  
Stress Conditions ◽  
Numerical Example ◽  
Concrete Damage ◽  
Concrete Damage Plasticity ◽  
Constitutive Parameters ◽  
Static Failure

Abstract The behaviour of concrete under quasi-static loadings for uniaxial compression, tension and plane stress conditions is studied. The failure criteria of concrete are discussed as well as the methods of constitutive parameters identification are elaborated. The attention is focus on an energetic interpretation of selected failure criteria. The numerical example with concrete damage plasticity material model is shown

Transition alpha structure in beta-isomorphous Nb-Hf alloys

1987 ◽  
Vol 45 ◽  
pp. 232-233
Author(s):  
R.W. Carpenter ◽  
Changhai Li ◽  
David J. Smith
Keyword(s):  
Solid Solution ◽  
Solution Phase ◽  
Miscibility Gap ◽  
Large Strains ◽  
Solid Solution Phase ◽  
Two Phase ◽  
Diffuse Intensity ◽  
Metastable Form ◽  
The Matrix ◽  
Equilibrium Morphology

Binary Nb-Hf alloys exhibit a wide bcc solid solution phase field at temperatures above the Hfα→ß transition (2023K) and a two phase bcc+hcp field at lower temperatures. The β solvus exhibits a small slope above about 1500K, suggesting the possible existence of a miscibility gap. An earlier investigation showed that two morphological forms of precipitate occur during the bcc→hcp transformation. The equilibrium morphology is rod-type with axes along <113> bcc. The crystallographic habit of the rod precipitate follows the Burgers relations: {110}||{0001}, <112> || <1010>. The earlier metastable form, transition α, occurs as thin discs with {100} habit. The {100} discs induce large strains in the matrix. Selected area diffraction examination of regions ∼2 microns in diameter containing many disc precipitates showed that, a diffuse intensity distribution whose symmetry resembled the distribution of equilibrium α Bragg spots was associated with the disc precipitate.

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