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Thermal expansion

About: Thermal expansion is a research topic. Over the lifetime, 21040 publications have been published within this topic receiving 349407 citations. The topic is also known as: heat expansion.


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Journal ArticleDOI
TL;DR: In this article, the authors analyzed the surface effect of thermal expansion in mirror body and mirror coating in laser interferometric gravitational antennae, and showed that the last surface effect can be larger than the first one due to larger thermal expansion coefficient of coating material and smaller effective volume.

77 citations

Journal ArticleDOI
Dirk J. Broer1, Grietje N. Mol1
TL;DR: In this paper, the influence of the molecular structure and type and degree of orientation on the anisotropic thermal expansion of polymeric networks has been investigated, and it is shown that the expansion coefficient of uniaxially oriented networks is slightly positive at temperatures below the glass transition of the networks and becomes negative as soon as this transition sets in the result is an effectively zero expansion over a wide temperature range.
Abstract: Densely cross-linked oriented polymer networks are made by in-situ photopolymerization of oriented liquid-crystalline diacrylates. Freestanding films that exhibited highly, anisotropic thermal expansion were prepared. The influence of the molecular structure and type and degree of orientation on the anisotrpic thermal expansion is described. The expansion coefficient of uniaxially oriented networks in the direction of the molecular orientation is slightly positive at temperatures below the glass transition of the networks and becomes negative as soon as this transition sets in the result is an effectively zero expansion over a wide temperature range. By introducing a molecular helix in, the network perpendicular to the film surface, a low thermal expansion is established in two directions in the plane of the film or coating.

77 citations

Journal ArticleDOI
TL;DR: In this paper, a conversional model of transformation strains occurring during austenite decomposition to phase fractions was developed using an optimal set of lattice parameters and thermal expansion coefficients of each phase associated with low alloy steels.

77 citations

Journal ArticleDOI
TL;DR: It is shown that the introduction of the parameter phi, equal to the specific volume occupied by the nuclei of the solid phase, together with psi provides a natural explanation of the temperature dependence of density and thermal expansion coefficients of glycerol in its liquid, solid amorphous, glassy, and crystal states.
Abstract: The relationship of the microstructure of supercooled, highly viscous glycerol to the temperature dependence of its density, thermal expansion coefficient, and shear viscosity are discussed. The character of this temperature dependence at the transition from low viscosity state to the solid amorphous state (solidified state without nuclei) is described with help of function ψ, which can be interpreted as the effective number of degrees of freedom responsible for the change of viscosity of glycerol over a broad range; these degrees of freedom are those related to the α-relaxation process. It is shown that the change in effective activation energy of the viscosity is completely determined by the parameter ψ. The change in the shear viscosity of glycerol due to the influence of the solid-phase nuclei is considered. It is shown that the introduction of the parameter φ, equal to the specific volume occupied by the nuclei of the solid phase, together with ψ provides a natural explanation of the temperature depe...

77 citations

Journal ArticleDOI
TL;DR: In this article, the authors used multi-walled carbon nanotubes (MWCNTs) for the control of coefficients of thermal expansion (CTEs) of composite materials based on experimental data of CTEs and Young's modulus newly obtained using a combined testing procedure.
Abstract: Feasibility of using multi-walled carbon nanotubes (MWCNTs) for the control of coefficients of thermal expansion (CTEs) of composite materials was evaluated, based on experimental data of CTEs and Young’s modulus newly obtained using a combined testing procedure. The axial CTE of the MWCNTs were evaluated over the temperature range −5 °C to 85 °C by using the MWCNT’s Young’s modulus and CTE of the aligned MWCNT reinforced epoxy composites in Turner’s model. The Young’s moduli of the MWCNTs were calculated by using Voigt model and the composite Young’s modulus measured by tensile tests. The MWCNTs were shown to possess negative CTEs, and the nanotube CTEs tended to become less negative with increasing temperature. Owing to their large Young’s modulus, aspect ratio and negative CTEs, the use of MWCNTs aligned axially was shown to be effective at controlling the CTE of polymer composites at lower volume fractions compared to conventional negative CTE materials.

77 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023603
20221,249
2021683
2020742
2019759
2018767