Publication

Fabrication and curing conditions effects on the fatigue behavior of a structural adhesive

Anastasios Vassilopoulos, José Manuel de Sena Cruz
2020
Journal Articles

Résumé

This paper investigates the effects of degassing, curing and post-curing conditions on the tensile quasi-static and fatigue behavior of a cold-curing structural epoxy adhesive. Quasi-static experiments performed at standardized and high displacement rates similar to those imposed to the material under fatigue loading, in order to derive comparable results from both loadings, and tensile-tensile fatigue tests at a fixed stress ratio, were carried out. Digital image correlation, video extensometer, thermal camera, digital camera and microscope were used to record the evolution of the strain and temperature, and assess the damage evolution during and after loading. The results shown that degassing can improve the material behavior when curing at ambient temperatures, since it assists the removal of several small voids from the bulk adhesive. However, when curing the material at high temperatures, immediately after mixing, the degassing does not offer any advantage, and the material's long-term performance decreases.

Source officielle

https://infoscience.epfl.ch/entities/publication/c5e42454-4601-4753-b8b3-b7b0a4c27fa2

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Anastasios Vassilopoulos, José Manuel de Sena Cruz
2020
Journal Articles

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/c5e42454-4601-4753-b8b3-b7b0a4c27fa2

À propos de ce résultat

Concepts associés (20)

Fatigue (matériau)

vignette|Photomicrographie de la progression des fissures dans un matériau dues à la fatigue. Image tirée de . La fatigue est l'endommagement local d'une pièce sous l'effet d'efforts variables : forces appliquées, vibrations, rafales de vent Alors que la pièce est conçue pour résister à des efforts donnés, la variation de l'effort, même à des niveaux bien plus faibles que ceux pouvant provoquer sa rupture, peut à la longue provoquer sa rupture. Les essais de fatigue permettent de déterminer la résistance des matériaux à de telles faibles charges répétées.

Stress–strain analysis

Stress–strain analysis (or stress analysis) is an engineering discipline that uses many methods to determine the stresses and strains in materials and structures subjected to forces. In continuum mechanics, stress is a physical quantity that expresses the internal forces that neighboring particles of a continuous material exert on each other, while strain is the measure of the deformation of the material. In simple terms we can define stress as the force of resistance per unit area, offered by a body against deformation.

Science des matériaux

La science des matériaux repose sur la relation entre les propriétés, la morphologie structurale et la mise en œuvre des matériaux qui constituent les objets qui nous entourent (métaux, polymères, semi-conducteurs, céramiques, composites, etc.). Elle se focalise sur l'étude des principales caractéristiques des matériaux, ainsi que leurs propriétés mécaniques, chimiques, électriques, thermiques, optiques et magnétiques. La science des matériaux est au cœur de beaucoup des grandes révolutions techniques.

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