Publication

Evaluation of Post‑Consumer Recycled Polypropylene‑Based Composite Materials Reinforced With Rice Husk Fibers

Véronique Michaud
2023

Abstract

The influence of voids on the quasi-static Mode I fracture performance of thick adhesive joints was investigated in this article. Double Cantilever Beam (DCB) joints were manufactured with glass fiber reinforced epoxy adherends and SikaPower®-830 epoxy adhesive in the cm thickness range. The high-viscosity adhesive leads to the inevitable presence of voids, resulting in unstable propagation and promoting crack path deviations. Voids could also decrease the apparent fracture strain energy release rate (SERR) since the SERR calculation assumes that the fracture surface contains no voids, while the actual surface area is reduced because of the voids. In conclusion, grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviations, allowing the estimation of reliable materials fracture data.

Official source

https://infoscience.epfl.ch/entities/publication/2cff21cf-613f-4a9c-b816-97769b27f044

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Véronique Michaud
2023

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2cff21cf-613f-4a9c-b816-97769b27f044

About this result

Related concepts (21)

Fracture

Fracture is the separation of an object or material into two or more pieces under the action of stress. The fracture of a solid usually occurs due to the development of certain displacement discontinuity surfaces within the solid. If a displacement develops perpendicular to the surface, it is called a normal tensile crack or simply a crack; if a displacement develops tangentially, it is called a shear crack, slip band or dislocation. Brittle fractures occur without any apparent deformation before fracture.

Fracture mechanics

Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture. Theoretically, the stress ahead of a sharp crack tip becomes infinite and cannot be used to describe the state around a crack. Fracture mechanics is used to characterise the loads on a crack, typically using a single parameter to describe the complete loading state at the crack tip.

Water content

Water content or moisture content is the quantity of water contained in a material, such as soil (called soil moisture), rock, ceramics, crops, or wood. Water content is used in a wide range of scientific and technical areas, and is expressed as a ratio, which can range from 0 (completely dry) to the value of the materials' porosity at saturation. It can be given on a volumetric or mass (gravimetric) basis. Volumetric water content, θ, is defined mathematically as: where is the volume of water and is equal to the total volume of the wet material, i.

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Evaluation of Post‑Consumer Recycled Polypropylene‑Based Composite Materials Reinforced With Rice Husk Fibers

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