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RISS 인기검색어
- 검색키워드
- 저자 : Joseph Absi (검색결과 3 건)
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Experimental and numerical study of a modified ASTM C633 adhesion test for strongly-bonded coatings
Raphaëlle Bernardie,Reda Berkouch,Stéphane Valette,Joseph Absi,Pierre Lefort 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.7
When coatings are strongly bonded to their substrates it is often difficult to measure the adhesion values. The proposed method, which is suggested naming “silver print test”, consists in covering the central part of the samples with a thin layer of silver paint, before coating. The process used for testing this new method was the Air plasma spraying (APS), and the materials used were alumina coatings on C35 steel substrates, previously pre-oxidized in CO 2 . The silver painted area was composed of small grains that did not oxidize but that significantly sintered during the APS process. The silver layer reduced the surface where the coating was linked to the substrate, which allowed its debonding, using the classical adhesion test ASTM C633-13, while the direct use of this test (without silver painting) led to ruptures inside the glue used in this test. The numerical modelling, based on the finite element method with the ABAQUS software, provided results in good agreement with the experimental measurements. This concordance validated the used method and allowed accessing to the values of adherence when the experimental test ASTM C633-13 failed, because of ruptures in the glue. After standardization, the “silver print test” might be used for other kinds of deposition methods, such as PVD, CVD, PECVD.
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Mechanical and electrical properties of a polyester resin reinforced with clay-based fillers
Dorel Buncianu,NicolasTessier-Doyen,Fabien Courreges,Joseph Absi,Pascal Marchet,Mihai Jadaneant 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.3
In this study, composite polymer-based materials were fabricated, in which a significant proportion of polyester resin was substituted by low-cost and environmentally-friendly clay-based raw materials. The main objective is to improve mechanical properties while maintaining a reasonable electrical insulating behavior. A homogenized distribution of fillers within the matrix compatible with the processing parameters was obtained up to a maximum added fraction of 20 vol%. Mechanical characterization using uniaxial traction tests and Charpy impact pendulum machine showed that stress-to-rupture can be enhanced of approximately 25 %. In addition, fracture energy was doubled for the best formulation. Dielectric constant was decreased and loss factor was slightly increased when electrical resistivity remained almost constant. In general, the composite materials with metakaolin fillers exhibited higher mechanical properties and greater electrical insulating behavior. Microstructural observation showed the presence of decohesive agglomerates of particles at the interface with the matrix. The mechanical properties were found to be more sensitive than electrical properties to the homogeneity of filler dispersion in the matrix.
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Multi-Scale Mechanical Behaviour of a Highly Porous Alumina Based Foam
Dorel Buncianu,Nicolas Tessier‑Doyen,Joseph Absi,Radu Negru,Liviu Marşavina 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.10
This work aims to characterize mechanical properties (strength and fracture toughness) of an alumina-based ceramic foamexhibiting a pore volume fraction around 88% with a multi-scale porosity ranging from 300 to < 2 μm with a slight interconnectivityof cells. Young’s modulus determined by three different methods (resonance, ultrasonic and compression) has beenestimated to approximately 4 GPa which is a remarkable value for materials exhibiting such a porous volume. Moreover,regarding solid material, a value of 380 GPa taking into account the imperfect purity of alumina and the effect of grainboundaries has been determined by indentation at nano-scale. Values predicted by Ashby–Gibson and Pabst analytical modelsprovide reliable results concerning the significant interconnectivity of porous cells in the microstructure. Finally, compressive,bending strengths and fracture toughness are respectively close to 2 MPa, 1 MPa and 0.1 MPa m1/2. These values arein agreement with the results obtained by some authors for alumino-silicate based foams exhibiting close compositions.
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