Hyperelasticity, dynamic mechanical property, and rheology of addition‐type silicone rubber (VPDMS cured by PMHS)

Dong, Hai‐Lin; Li, Dongxu; Liao, Yihuan

doi:10.1002/app.42036

Cited by 12 publications

(5 citation statements)

References 42 publications

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“…The fractional derivative theory has been utilized to describe the hysteresis characteristics of the dynamic mechanical properties of a spacecraft structure containing the viscoelastic materials in our previous work. [27][28][29][30][31][32][33] And in the present paper, an improved differential equation is investigated to describe the hysteresis characteristics of the aerodynamic coefficients.…”

Section: Progressive State-space Representationmentioning

confidence: 99%

Modeling of unsteady aerodynamic characteristics at high angles of attack

Dong

Zhang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part G:

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An improved model to express the unsteady aerodynamic characteristics at high angles of attack is presented in this paper. The proposed aerodynamic model is expressed on the basis of a progressive state-space representation and Taylor’s series expansion. The state-space expression is a first-order differential equation in which the power item of the angular rate of attack is introduced. The unsteady aerodynamic coefficients are described by Taylor’s series expansion in terms of input variables. The approach of minimum mean square error criterion is utilized to identify the unknown parameters of the proposed model by nonlinear least square method from the tunnel data. The given modeling method is experimentally demonstrated by the wind tunnel measurements of NACA 0015 airfoil with constant rate to high angles of attack, F18 aircraft with constant pitch rate ramp motion, and F18 HARV (high alpha research vehicle) configuration with large-amplitude harmonic oscillatory. The results show that it is possible to analyze more complex unsteady aerodynamic problems for an aircraft within the framework of the proposed aerodynamic model and the represented model is directly amenable to the simulation and control system design.

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Section: Progressive State-space Representationmentioning

confidence: 99%

Modeling of unsteady aerodynamic characteristics at high angles of attack

Dong

Zhang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…The dynamic properties of the viscoelastic components have been published in our other papers. 25–28 The dynamic mechanical analysis shows that the viscoelastic components express the stable elasticity and damping property when the temperature is above −30℃. 26 The total mass loss (TML) and the collected volatile condensable materials (CVCM) of the viscoelastic components provided by the manufacturer are 0.28% and 0.002%, respectively.…”

Section: Description Of the Mfsmentioning

confidence: 99%

Dynamic characteristics of multifunctional structure for spacecraft

Dong

Zhang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part G:

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The minimum cost is an important aspect of the spacecraft design. A proposed approach is the multifunctional structure technology, which fully integrates subassemblies and performs both structural and other functions for spacecraft. By combining the structural and functional subsystems into a single unit, the mass and volume savings can be realized. In order to investigate the dynamical properties of the multifunctional structure, which contains viscoelastic components, sine-sweep tests and random vibrations are carried out in present paper. The experimental results show that the multifunctional structure could survive the vibration environment. The first resonance frequency decreases with increment of the testing levels, and the base frequency of the multifunctional structure is larger than 100 Hz for all tested loading cases, meeting the frequency requirement for most spacecraft platforms. The multifunctional structure in this paper has successfully combined the structural and battery function, indicating potential for future lightweight and cost-saving spacecraft application.

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“…Although many research groups have done a lot of work on liquid crystal elastomers, − there is very little published research on its mechanical adaptability, and the mechanical tensile strength in previous literature almost never exceeds 1 MPa. − Due to high- and low-temperature resistance, aging resistance, weather resistance, and other excellent characteristics, − our group has been committed to developing mechanical adaptive materials based on polydimethylsiloxane to ensure the application of this material under harsh environments, and commercially available PDMS-based elastomers do not perform this function. In our previous work, we developed several kinds of liquid crystal-based organosilicone elastomers with mechanical adaptability, whose mechanical tensile strength was up to 4 Mpa. , However, the production process of introducing the crosslinking system with liquid crystal units as the crosslinking center in our previous study is complicated, and it is very difficult to prepare large size samples for practical applications. − …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a Liquid Crystal-Modified Polydimethylsiloxane Rubber with Mechanical Adaptability Based on Chain Extension in the Process of Crosslinking

2022

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The mechanical adaptive material is a kind of functional material that can effectively dissipate energy and suppress the increase of its stress under continuous strain in a large deformation area, which are vital in artificial muscles, connection devices, soft artificial intelligence robots, and other areas. Scientists have been working to broaden the platform of the material's mechanical adaptive platform and improve its mechanical strength by specific structure design. Based on it, we expect to introduce a mechanism of energy dissipation from the molecular chain scale to further improve mechanical adaptability. We developed a liquid crystalmodified polydimethylsiloxane rubber with mechanical adaptability based on chain extension in the process of crosslinking. Results showed that liquid crystal (0.7 mol %)-modified silicone rubber can obviously dissipate energy to achieve mechanical adaptive function, and the energy dissipation ratio of polydimethylsiloxane rubber (MQ), 4-propyl-4′-vinyl-1,1′-bi(cyclohexane)-modified polydimethylsiloxane rubber (3CCV-MQ), and 4-methoxyphenyl-4-(3-butenyloxy) benzoate-modified polydimethylsiloxane rubber (MBB-MQ) gradually decreases from 30 to 24%. Excessive thiol groups of liquid crystal-modified polydimethylsiloxane react with its vinyl group to achieve the chain extension, which significantly improves the mechanical strength from 2.74 to 5.83 MPa and elongation at break from 733 to 1096%. This research offers some new insights into improving the mechanical strength of silicone rubber and is of great significance for the application of the mechanical adaptive material.

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Hyperelasticity, dynamic mechanical property, and rheology of addition‐type silicone rubber (VPDMS cured by PMHS)

Cited by 12 publications

References 42 publications

Modeling of unsteady aerodynamic characteristics at high angles of attack

Modeling of unsteady aerodynamic characteristics at high angles of attack

Dynamic characteristics of multifunctional structure for spacecraft

Synthesis and Characterization of a Liquid Crystal-Modified Polydimethylsiloxane Rubber with Mechanical Adaptability Based on Chain Extension in the Process of Crosslinking

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