Mechanical Properties of Silicone Rubber in a Closed Volume

O’Hara, G. P.

doi:10.21236/ada138129

Cited by 15 publications

(10 citation statements)

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“…Large variations of the thickness may be present in the experimental data, as shown in Table 3. For the Poisson's ratio, we used the value reported in O'Hara, [19] as they considered very similar conditions to the ones used in the present study.…”

Section: Results On Simulated Datamentioning

confidence: 99%

“…The results of the tensile tests are shown in Figure 7. The horizontal axis denotes the engineering strain ε calculated from ( 18) and the vertical axis denotes the engineering stress σ in MPa calculated from (19), respectively. In total, Noise level (μm) 0 1.0433 60 measurements were performed.…”

Section: Tensile Testingmentioning

confidence: 99%

“…Silicone rubber is nearly incompressible, and the value of 0.48 was chosen based on the results of O'Hara. [19] To accurately determine the thickness of our membranes, we measured the thickness at four locations using a digital micrometer with an accuracy of 1 μm. The mean thickness <h> and corresponding standard deviation s h found from these measurements is shown in Table 3.…”

Section: Vf Computationsmentioning

confidence: 99%

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Material characterization of curved shells under finite deformation using the virtual fields method

Livens

Avril

Dirckx

2021

Strain

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Although full-field measurement techniques have been well established, material characterization from these data remains challenging. Often, no closedform solution exists between measured quantities and sought material parameters. In this paper, a novel approach to determine the stiffness of thin curved membranes is proposed, based on the virtual fields method (VFM). Utilizing Kirchhoff-Love shell theory, we show that the displacements can be decomposed into an in-plane displacement and a rotation of the mid-surface of the shell. Consequently, the strain tensor at the outer surface of the shell can then be decomposed into a membrane and a bending part. This allows for the VFM to be applied based only on data of the outer surface and on surfaces of arbitrary curvature. The method is first applied to simulated data. It is shown that the elastic modulus can be identified with less than 5% error if the thickness and Poisson ratio are known accurately. A 5% uncertainty in either the

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Section: Results On Simulated Datamentioning

confidence: 99%

Section: Tensile Testingmentioning

confidence: 99%

Section: Vf Computationsmentioning

confidence: 99%

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Material characterization of curved shells under finite deformation using the virtual fields method

Livens

Avril

Dirckx

2021

Strain

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“…However, the numerical calculation does not converge with a value of 0.5. Furthermore, O'Hara (1983), by using the hydrostatic method, found Poisson's ratio in the range of 0.48 to 0.49 for small strains. Finally, the stress peak values at the borehole have been numerically determined for different Poisson's ratio values in the range of 0.48 to 0.49 for the silicone sealant and the PIB, and no influence on the stress peak has been noticed.…”

Section: Fe-models Of Point Fitted Insulation Glass Unitmentioning

confidence: 99%

The stress peak at the borehole of point-fitted IGU with undercut anchors

Tibolt

Odenbreit

2014

Journal of Facade Design and Engineering

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The highest transparency in glass facades is obtained with point fitted glass units. Point fitted insulating glass units minimize thermal bridging and lead to glass facades with better energy efficiency. Though, insufficient knowledge is present to offer a design method for point fittings in insulating glass. Therefore research has been carried out to extend the existing SLG-design-method (Linear superposition of local and global stress components) of Beyer for point fitted single and laminated glass to insulation glass units. This paper presents the first results of this research campaign. Load bearing tests on point fittings in single glazing have been conducted. A finite element model of the point fitting is calibrated by strain comparison. A test campaign for the deviation of a material law for silicone, used as secondary sealant in the edge seal system, is presented. The verified FE-model is implemented in a selected insulation glass unit, and the influence of the edge distance of the point fitting, as well as the edge bond stiffness and geometry on the stress peak at the borehole is investigated. In addition, the size of the so called 'local area' is adjusted for insulation glass units.

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“…Huang and Kinloch 33 showed that for a CTBN-modified epoxy, the Poisson's ratio of the rubber had to be above 0.497 for internal rubber cavitation to occur before any other toughening mechanisms. For several RT vulcanizing silicone rubbers, O'Hara 34 found that the Poisson's ratio peaked at 0.49 even under high pressures. Therefore, cavitation of a particle made of a similar rubber to that in the study of O'Hara 34 is not likely.…”

Section: Toughening Mechanismsmentioning

confidence: 99%

Experimental studies of the deformation mechanisms of core-shell rubber-modified diglycidyl ether of bisphenol-A epoxy at cryogenic temperatures

Brown

Schneider

Murphy

2013

Journal of Composite Materials

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Epoxy polymers, although often used in fiber-reinforced polymeric composites, have an inherent low toughness that further decreases with decreasing temperatures. Second-phase additives have been effective in increasing the toughness of epoxies at room temperature; however, the mechanisms at low temperatures are still not understood. In this study, the deformation mechanisms of a diglycidyl ether of bisphenol-A epoxy modified with MX960 core-shell rubber particles were investigated under quasi-static tensile and impact loads at room temperature and liquid nitrogen temperature. Overall, the core-shell rubber had little effect on the tensile properties at room temperature and liquid nitrogen temperature. The impact strength decreased from neat to 1 wt% and 3 wt% but increased from neat to 5 wt% at room temperature and liquid nitrogen temperature, with a higher impact strength at room temperature at all core-shell rubber loadings. While a large toughening effect was not seen in this study, the mechanisms analyzed herein will likely be of use for further material investigations at cryogenic temperatures.

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Mechanical Properties of Silicone Rubber in a Closed Volume

Cited by 15 publications

References 0 publications

Material characterization of curved shells under finite deformation using the virtual fields method

Material characterization of curved shells under finite deformation using the virtual fields method

The stress peak at the borehole of point-fitted IGU with undercut anchors

Experimental studies of the deformation mechanisms of core-shell rubber-modified diglycidyl ether of bisphenol-A epoxy at cryogenic temperatures

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