The Experts below are selected from a list of 5115 Experts worldwide ranked by ideXlab platform
Filippo Berto - One of the best experts on this subject based on the ideXlab platform.
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calibration method for monitoring hygro mechanical reactions of pine and oak wood by acoustic emission nondestructive testing
Materials, 2020Co-Authors: Chiara Bertolin, Lavinia De Ferri, Filippo BertoAbstract:The main issue of wood is its sensitivity to Relative Humidity (RH) variations, affecting its dimensional stability, and thus leading to crack formations and propagations. In situ structural health monitoring campaigns imply the use of portable noninvasive techniques such as acoustic emission, used for real-time detection of energy released when cracks form and grow. This paper proposes a calibration method, i.e., acoustic emission, as an early warning tool for estimating the length of new formed cracks. The predictability of ductile and Brittle Fracture Mechanisms based on acoustic emission features was investigated, as well as climate-induced damage effect, leading to a strain-hardening Mechanism. Tensile tests were performed on specimens submitted to a 50% RH variation and coated with chemicals to limit moisture penetration through the radial surfaces. Samples were monitored for acoustic emission using a digital camera to individuate calibration curves that correlated the total emitted energy with the crack propagation, specifically during Brittle Fracture Mechanism, since equations provide the energy to create a new surface as the crack propagates. The dynamic surface energy value was also evaluated and used to define a Locus of Equilibrium of the energy surface rate for crack initiation and arrest, as well as to experimentally demonstrate the proven fluctuation concept.
Chiara Bertolin - One of the best experts on this subject based on the ideXlab platform.
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calibration method for monitoring hygro mechanical reactions of pine and oak wood by acoustic emission nondestructive testing
Materials, 2020Co-Authors: Chiara Bertolin, Lavinia De Ferri, Filippo BertoAbstract:The main issue of wood is its sensitivity to Relative Humidity (RH) variations, affecting its dimensional stability, and thus leading to crack formations and propagations. In situ structural health monitoring campaigns imply the use of portable noninvasive techniques such as acoustic emission, used for real-time detection of energy released when cracks form and grow. This paper proposes a calibration method, i.e., acoustic emission, as an early warning tool for estimating the length of new formed cracks. The predictability of ductile and Brittle Fracture Mechanisms based on acoustic emission features was investigated, as well as climate-induced damage effect, leading to a strain-hardening Mechanism. Tensile tests were performed on specimens submitted to a 50% RH variation and coated with chemicals to limit moisture penetration through the radial surfaces. Samples were monitored for acoustic emission using a digital camera to individuate calibration curves that correlated the total emitted energy with the crack propagation, specifically during Brittle Fracture Mechanism, since equations provide the energy to create a new surface as the crack propagates. The dynamic surface energy value was also evaluated and used to define a Locus of Equilibrium of the energy surface rate for crack initiation and arrest, as well as to experimentally demonstrate the proven fluctuation concept.
H H Masjuki - One of the best experts on this subject based on the ideXlab platform.
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a comparative analysis of tensile and impact toughness behavior of cold worked and annealed 7075 aluminum alloy
International Journal of Impact Engineering, 2010Co-Authors: Mohammad Tajally, Zainul Huda, H H MasjukiAbstract:Abstract The present research reports comparative analysis of effects of cold working (CW) and annealing on tensile and impact-toughness behavior of 7075 Al alloy. Cold-rolled samples were annealed at various temperatures in the range of 225–345 °C for 5 min. A remarkable increase in ductility and impact toughness was observed when specimens were annealed at temperatures above 265 °C for 5 min. It was also found that cold rolling has a profound effect on strength anisotropy that enhances with amount of % CW. The maximum strengths were observed in the transverse direction in the investigated alloy. Cold rolling has been found to impart a significant effect on decreasing the impact toughness of alloy that enhance with amount of % CW; this loss in impact energy could not be compensated by recrystallization process. It has also been shown that impact test can be considered as a simple method for measurement of toughness and plastic anisotropy in sheet and plate. The analysis of the Fracture surfaces with the scanning electron microscope presented dimpled morphology for the failure ductile Mechanism in starting material and fibrous structure with some quasi-cleavage regions in cold-rolled samples, corresponding to the ductile to Brittle Fracture Mechanism.
S T Selvamani - One of the best experts on this subject based on the ideXlab platform.
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analysis of dry sliding wear behaviour of al6061 sic al2o3 hybrid metal matrix composites
Composites Part B-engineering, 2013Co-Authors: K Umanath, K Palanikumar, S T SelvamaniAbstract:Abstract This paper presents the wear behaviour of Al6061-T6 discontinuously reinforced with silicon carbide (SiC) and aluminium oxide (Al2O3) composite. The test specimens are prepared and tested as per ASTM standard. The experiments are conducted by using a pin on disc wear tester. Empirical relation is established to estimate the wear using statistical regression analysis and analysis of variance (ANOVA). The results indicated that the wear resistance of the 15% hybrid composite is better than that of the 5% composite. The Fracture surface of composites shows the ductile tear ridges and cracked SiC and Al2O3 particles indicating both ductile and Brittle Fracture Mechanism.
Lavinia De Ferri - One of the best experts on this subject based on the ideXlab platform.
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calibration method for monitoring hygro mechanical reactions of pine and oak wood by acoustic emission nondestructive testing
Materials, 2020Co-Authors: Chiara Bertolin, Lavinia De Ferri, Filippo BertoAbstract:The main issue of wood is its sensitivity to Relative Humidity (RH) variations, affecting its dimensional stability, and thus leading to crack formations and propagations. In situ structural health monitoring campaigns imply the use of portable noninvasive techniques such as acoustic emission, used for real-time detection of energy released when cracks form and grow. This paper proposes a calibration method, i.e., acoustic emission, as an early warning tool for estimating the length of new formed cracks. The predictability of ductile and Brittle Fracture Mechanisms based on acoustic emission features was investigated, as well as climate-induced damage effect, leading to a strain-hardening Mechanism. Tensile tests were performed on specimens submitted to a 50% RH variation and coated with chemicals to limit moisture penetration through the radial surfaces. Samples were monitored for acoustic emission using a digital camera to individuate calibration curves that correlated the total emitted energy with the crack propagation, specifically during Brittle Fracture Mechanism, since equations provide the energy to create a new surface as the crack propagates. The dynamic surface energy value was also evaluated and used to define a Locus of Equilibrium of the energy surface rate for crack initiation and arrest, as well as to experimentally demonstrate the proven fluctuation concept.