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Elastic modulus

About: Elastic modulus is a research topic. Over the lifetime, 33153 publications have been published within this topic receiving 810247 citations.


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TL;DR: In this article, an analytic formula for the elastic bending modulus of single-layer MoS2 (SLMoS2) was derived, from an empirical interaction potential, which does not need to define or estimate a thickness value.
Abstract: We derive, from an empirical interaction potential, an analytic formula for the elastic bending modulus of single-layer MoS2 (SLMoS2). By using this approach, we do not need to define or estimate a thickness value for SLMoS2, which is important due to the substantial controversy in defining this value for two-dimensional or ultrathin nanostructures such as graphene and nanotubes. The obtained elastic bending modulus of 9.61 eV in SLMoS2 is significantly higher than the bending modulus of 1.4 eV in graphene, and is found to be within the range of values that are obtained using thin shell theory with experimentally obtained values for the elastic constants of SLMoS2. This increase in bending modulus as compared to monolayer graphene is attributed, through our analytic expression, to the finite thickness of SLMoS2. Specifically, while each monolayer of S atoms contributes 1.75 eV to the bending modulus, which is similar to the 1.4 eV bending modulus of monolayer graphene, the additional pairwise and angular interactions between out of plane Mo and S atoms contribute 5.84 eV to the bending modulus of SLMoS2.

146 citations

Journal ArticleDOI
TL;DR: An elastocapillary model for contact angles on a soft solid is derived by coupling a mean-field model for the molecular interactions to elasticity and it is demonstrated that the limit of a vanishing elastic modulus yields Neumann's law or a variation thereof, depending on the force transmission in the solid surface layer.
Abstract: The contact angle that a liquid drop makes on a soft substrate does not obey the classical Young’s relation, since the solid is deformed elastically by the action of the capillary forces. The finite elasticity of the solid also renders the contact angles differently from those predicted by Neumann’s law, which applies when the drop is floating on another liquid. Here, we derive an elastocapillary model for contact angles on a soft solid by coupling a mean-field model for the molecular interactions to elasticity. We demonstrate that the limit of a vanishing elastic modulus yields Neumann’s law or a variation thereof, depending on the force transmission in the solid surface layer. The change in contact angle from the rigid limit to the soft limit appears when the length scale defined by the ratio of surface tension to elastic modulus γ/E reaches the range of molecular interactio

146 citations

Journal ArticleDOI
TL;DR: Cholinergic synaptic vesicles from Torpedo californica have been probed with the atomic force microscope in aqueous buffers to map and measure their elastic properties, showing that Vesicular centers were hardest in calcium-containing buffer and softest in isoosmotic buffer.

146 citations

Journal ArticleDOI
TL;DR: In this paper, the elastic modulus of near β and β titanium alloys was measured by nano-indentation and ultrasonic techniques, and the data obtained from both the experiments were analyzed and compared with each other.
Abstract: The elastic modulus of near β and β titanium alloys was measured by nano-indentation and ultrasonic techniques The data obtained from both the experiments were analyzed and compared with each other The effects of composition and heat treatment on elastic modulus of the material are discussed The elastic modulus of β Ti–35Nb–57Ta–72Zr (TNTZ) was found to be half of the elastic modulus of the titanium Near β Ti–13Zr–13Nb (TZN) alloy hot worked at 800 °C and solution treated at 800 °C followed by water quenching also showed low elastic modulus value The accuracy of these two elastic modulus measurement techniques is discussed in terms of microstructures

146 citations

Journal ArticleDOI
TL;DR: In this paper, the secondary cell walls of spruce wood were infiltrated with a melamine-formaldehyde resin and nano-indentation tests revealed an average Young's modulus of 16.1 GPa and hardness of 0.24 GPa.
Abstract: Samples of spruce wood were infiltrated with a melamine–formaldehyde resin. After curing of the resin, a melamine concentration of 24% (v/v) was measured in the secondary cell walls of melamine treated wood. Nano-indentation tests revealed an average Young's modulus of 16.1 GPa and a hardness of 0.24 GPa for untreated secondary cell walls. In the melamine treated cell walls, an increase in the Young's modulus of 33% to 21.4 GPa was observed. With 115%, i.e. 0.52 GPa, the increase in longitudinal hardness due to melamine–formaldehyde treatment was even more pronounced. This proves clearly that melamine treatment of wood improves mechanical properties of cell walls. Thus, treatment of wood with melamine–formaldehyde resin shows a considerable potential to improve mechanical properties, as desired for applications where large stresses normal to grain arise.

146 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023611
20221,303
20211,450
20201,401
20191,447
20181,369