Application of digital image correlation technique to evaluate creep degradation of sealing elastomers due to exposure to fluids

Farfán-Cabrera, Leonardo Israel; Pascual-Francisco, Juan Benito; Gallardo-Hernández, Ezequiel Alberto; Susarrey-Huerta, Orlando

doi:10.1016/j.polymertesting.2017.11.017

Cited by 13 publications

(4 citation statements)

References 15 publications

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“…During the loading process, the industrial camera was set to take pictures every second. Strain clouds at speckle locations at different loading stages were calculated by using DIC [30,31].…”

Section: Experimental Materials and Test Methodsmentioning

confidence: 99%

On the Mechanical and Electrical Properties of the Composite Structure of PVC Membrane and Thin-Film Battery under Biaxial Tension

et al. 2021

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This paper aims to study the mechanical and electrical properties of the composite structure of PVC film and film cell under biaxial tension. The saddle PVC membrane structure with thin-film battery was obtained by biaxial tensile tests carried out on the composite structure along the fiber direction and at an angle of 45 degrees to the fiber, respectively. The deformation of the film cell and PVC membrane materials was tested using digital image technology, and the voltage of the film cell was tested using a multimeter. The results showed that the tensile strain occurred in both membrane batteries and PVC membrane at different loading levels, and the former was always less than the latter. At a tensile load with the ultimate load ratio of 60%, it was only at the film cell’s outer edge that the stripping occurred. Under the illumination of a stable light source, the film cell voltage decreased gradually with the increasing tensile load. No more than 10% of the cell voltage drop occurred when the membrane material, the principal tensile strain of the cell, and the cell’s expansion area ratio were less than 3.1%, 2.8%, and 1.03, respectively. The experimental results show that the film cell can be applied to the saddle membrane structure by controlling the appropriate load.

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Section: Experimental Materials and Test Methodsmentioning

confidence: 99%

On the Mechanical and Electrical Properties of the Composite Structure of PVC Membrane and Thin-Film Battery under Biaxial Tension

et al. 2021

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“…Mientras que, para una prueba de relajación de esfuerzos, es necesaria una carga desde 500 g hasta 20 kg. Con base en estos requerimientos y trabajos de investigación previos (Cabrera et al, 2018(Cabrera et al, , 2022, en este artículo se aborda el diseño de una máquina para pruebas de creep en elastómeros y que integre un sistema de control de temperatura, desde temperatura ambiente hasta 100 °C. Asimismo, se implementó un sistema de medición de deformaciones mediante la técnica de correlación digital de imágenes (DIC, por sus siglas en inglés).…”

Section: Introductionunclassified

Máquina para pruebas de termofluencia en elastómeros a diferentes temperaturas

Sotomayor-del-Moral

Pascual-Francisco

Farfán-Cabrera

2022

ICBI

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En este trabajo se aplicó el proceso de diseño mecánico para diseñar un dispositivo capaz de realizar pruebas experimentales de creep para diferentes elastómeros en amplio rango de cargas y temperaturas. El dispositivo se compone de dos subsistemas. El primero dispone de una cámara de temperatura con control PI, la cual integra un mecanismo de aplicación de peso muerto para garantizar un esfuerzo constante durante las pruebas. El segundo consiste en el sistema de medición de deformaciones de creep mediante la técnica de correlación digital de imágenes. Para probar el funcionamiento de la máquina se llevaron a cabo pruebas de fluencia con duración de 25 minutos en un elastómero común. Los resultados obtenidos fueron validados mediante pruebas de repetibilidad. Finalmente, las características y arreglo del dispositivo propuesto permiten la ejecución de pruebas de fluencia lenta en una gran variedad de elastómeros para evaluar su comportamiento viscoelástico a largo plazo a diferentes cargas y temperaturas.

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“…Several studies are found in the literature where accelerated aging has been applied to evaluate the degradation of rubbers. In many cases, the aim of the scientific research articles is to identify the behavior of the rubber over an extended period immersed in different corrosive environments such as hydraulic oil, [ 8,9 ] crude oil, [ 10 ] biodiesel, [ 11 ] aromatic fluid, [ 12,13 ] acid solutions, [ 14 ] or radioactive atmospheres. [ 15 ] Beside exposure to harsh environments, the recovery of elastomers after long‐term compression stresses is a target of various scientific investigations.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the aging of elastomeric acrylonitrile‐butadiene rubber and ethylene‐propylene‐diene monomer gaskets used to seal plates heat exchanger

Souza

Zanzi

Paiva

et al. 2021

Polymer Engineering & Sci

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Acrylonitrile‐butadiene rubber (NBR) and ethylene‐propylene‐diene monomer (EPDM) gaskets are used as seals in plates heat exchangers due to their elasticity and resilience. However, contact with fluids, oxygen, ozone, and heat lead to permanent deformation. This study investigates the degradation of gaskets submitted to similar service conditions: compressed in a groove for up to 360 h at 100 and 120°C. The analysis was carried through compression set (CS), compression stress relaxation, surface morphology, Shore A hardness, indentation modulus profile, crosslink density, and Fourier transform infrared region with attenuated total reflection analysis. For EPDM, in thermo‐oxidative aging there is a counterbalance between chain scission and crosslinking, which increases CS while hardness and crosslink density remain low. For NBR, diffusion‐limited oxidation causes heterogeneous oxidation, creating a crosslinking network near the surface. The values for CS, Shore A hardness, and crosslink density raised to 50%, 10%, and 75%, respectively. Furthermore, the side thermo‐oxidation was reduced due to the presence of the groove, which reduces oxygen access. Using FITR analysis, a thermo‐oxidative interaction mechanism was proposed for the EPDM and NBR gaskets. It was concluded that EPDM presented a more reliable behavior for the gasket and seal applications under the analyzed conditions.

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Application of digital image correlation technique to evaluate creep degradation of sealing elastomers due to exposure to fluids

Cited by 13 publications

References 15 publications

On the Mechanical and Electrical Properties of the Composite Structure of PVC Membrane and Thin-Film Battery under Biaxial Tension

On the Mechanical and Electrical Properties of the Composite Structure of PVC Membrane and Thin-Film Battery under Biaxial Tension

Máquina para pruebas de termofluencia en elastómeros a diferentes temperaturas

Evaluation of the aging of elastomeric acrylonitrile‐butadiene rubber and ethylene‐propylene‐diene monomer gaskets used to seal plates heat exchanger

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