Humidity diffusion through composite material under hydrostatic pressure

Ounaies, Mohamed; Harchay, Manel; Dammak, Fakhreddine; Daly, Hachmi Ben

doi:10.1007/s00170-019-04412-8

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…As for sensors made by PDMS, these internal pores are compacted by hydrostatic pressure, resulting in a reduction in the volume of the material, which affects the signal of the sensor. [43,44] In this experiment, underwater pressure loading is simulated by placing stainless steel blocks on top of the sensor array. As shown in Figure 3f, the sensor is still operating under highpressure conditions, and the sensor sensitivity is not affected by hydrostatic pressure.…”

Section: Hydrostatic Pressure-balanced Simulated Deep-sea Environment...mentioning

confidence: 99%

“…[26,27] Other flexible materials may have small bubbles during the preparation process, leading to deformation under huge hydrostatic pressure. [28,29] The hydrogel or other materials can exchange water molecules with the external environment, and these holes caused by bubbles will be filled by water, reducing material deformation. These phenomena indicate that hydrogels can be an ideal candidate for deep-sea sensors due to their high-water-content property.…”

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confidence: 99%

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Tactile Sensing for Soft Robotic Manipulators in 50 MPa Hydrostatic Pressure Environments

Liu,

Zhang,

et al. 2023

Advanced Intelligent Systems

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Deep‐sea exploration remains a challenging task as the extreme hydrostatic pressure environment, darkness, and suspended sediment launch severely hinder the capability of deep‐sea vehicles. As a complement to underwater camera, tactile perception becomes especially important in situations where machine vision is limited. However, tactile sensors utilized in deep sea, which should be able to detect pressure changes of only hundreds of pascals under high hydrostatic pressure, are still lacking. To tackle the challenge imposed by hydrostatic pressure, a simulated deep‐sea environment flexible sensor (SDEFS) is proposed, consisting of a force sensor array and a bending sensor based on hydrogels for tactile sensing in 50 MPa hydrostatic pressure environments. The force sensor is unaffected by the hydrostatic pressure and achieves high sensitivity of 82.62 N−1 under 100 MPa hydrostatic pressure. The SDEFS is utilized to classify objects based on the difference in hardness. It can accurately classify seven objects on the ground, and three objects in an underwater environment with hydrostatic pressure of 50 MPa, with total recognition accuracies of 98.3% and 96%, respectively. With high force measurement sensitivity and accurate recognition ability under water, the SDEFS is expected to provide very valuable haptic sensing and feedback in deep‐sea exploration.

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Section: Hydrostatic Pressure-balanced Simulated Deep-sea Environment...mentioning

confidence: 99%

mentioning

confidence: 99%

Tactile Sensing for Soft Robotic Manipulators in 50 MPa Hydrostatic Pressure Environments

Liu,

Zhang,

et al. 2023

Advanced Intelligent Systems

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“…Composites are constantly evolving with their use in every field. One of the most important innovations that have emerged is replacing ordinary materials due to the mechanical and physical properties of innovative composite materials [3]. When composite materials are exposed to environmental influences (temperature, humidity, etc.)…”

Section: Introductionmentioning

confidence: 99%

Investigation of Diffusion Welding Capability of WC Ceramic Based Ni Doped Composites

Yönetken¹,

Erol

2022

Politeknik Dergisi

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In this study, composite was produced with two different production methods after sintering using WC powders that were coated and not coated with Electroless Nickel (EN). The mechanical strengths of the composites (35.4 MPa) were determined by applying tensile shear test to the produced composites. After the characterization of the samples, it has been determined that the samples produced by electroless Ni coating have a higher solid state diffusion source than the others. Figure 2. Diffusion bonding unit where the samples were pressured with screw system. AimCombining Ni-doped ceramic matrix composites by solid state diffusion welding. Design & Methodology Composite production with powder metallurgy technique and tensile shear test, determination of mechanical and metallographic properties Originality The use of electroless Ni coating technique in composite production FindingsDetermination of tensile and hardness values as well as mechanical and metallographic properties of produced samples. ConclusionBetter mechanical properties of solid state diffusion welding have also been obtained in composites produced by the electroless Ni coating method.

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“…In fact, the researches of Pollard et al [10] proved that the increase in the diffusion coefficient and the amount of absorbed humidity is a result of the augmentation in the exposed pressure to the composite material. Similarly, the rise in the pressure induces an elevation in the diffusion parameters through the polyester/glass fibre composite [11, 12]. In addition, Hamidi et al [13] affirmed that the acceleration of the diffusion process, manifested by the increment in the diffusion coefficient and the amount of absorbed humidity, is in the interest of the extension in the pressure.…”

Section: Introductionmentioning

confidence: 99%

Dynamic humidity diffusion through the polyester/glass fibre composite

Ounaies

Daly

2021

Plastics, Rubber and Composites

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This is a statistical study of the dynamic humidity diffusion through the polyester/glass fibre composite. It analyses the influence of the environmental conditions like the temperature, the flow velocity and the pressure on the humidity diffusion through the composite material. It is divided into an experimental plan and a data analysis, which exploit the experimental results in order to analyse the process of humidity diffusion by highlighting the effects of the influencing parameters. The increase in the temperature, the pressure, the flow velocity and the percentage of fillers additives (ASP400) induce an augmentation in the diffusion coefficient and the amount of absorbed humidity. We can affirm that the flow velocity and the pressure have a higher impact on the diffusion parameters than the temperature. Moreover, the increase in the percentage of the fillers additives (ASP400) decreases the effect of the pressure and the flow velocity on the diffusion parameters.

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Humidity diffusion through composite material under hydrostatic pressure

Cited by 6 publications

References 12 publications

Tactile Sensing for Soft Robotic Manipulators in 50 MPa Hydrostatic Pressure Environments

Tactile Sensing for Soft Robotic Manipulators in 50 MPa Hydrostatic Pressure Environments

Investigation of Diffusion Welding Capability of WC Ceramic Based Ni Doped Composites

Dynamic humidity diffusion through the polyester/glass fibre composite

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