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Artykuły w czasopismach na temat "Noyau ductile"
Rivers, Toby, i Walfried Schwerdtner. "Post-peak Evolution of the Muskoka Domain, Western Grenville Province: Ductile Detachment Zone in a Crustal-scale Metamorphic Core Complex". Geoscience Canada 42, nr 4 (7.12.2015): 403. http://dx.doi.org/10.12789/geocanj.2015.42.080.
Pełny tekst źródłaVan Rooyen, Deanne, i Sharon D. Carr. "Deconstructing the Infrastructure: A Complex History of Diachronous Metamorphism and Progressive Deformation during the Late Cretaceous to Eocene in the Thor-Odin–Pinnacles Area of Southeastern British Columbia". Geoscience Canada 43, nr 2 (18.05.2016): 103. http://dx.doi.org/10.12789/geocanj.2016.43.097.
Pełny tekst źródłaKonstantinovskaya, Elena, Gennady Ivanov, Jean-Louis Feybesse i Jean-Luc Lescuyer. "Structural Features of the Central Labrador Trough: A Model for Strain Partitioning, Differential Exhumation and Late Normal Faulting in a Thrust Wedge under Oblique Shortening". Geoscience Canada, 29.03.2019, 5–30. http://dx.doi.org/10.12789/geocanj.2019.46.143.
Pełny tekst źródłaRozprawy doktorskie na temat "Noyau ductile"
Coget, Yann. "Étude du comportement mécanique à l'impact d'une munition à noyau ductile (petits à moyens calibres)". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0123.
Pełny tekst źródłaDesign and evaluation of bulletproof vests require the use of experimental ballistic tests. These tests allow to visualize, in a real-life situation, ballistic performances of a body armor namely potential perforation of the protection and deflection of the rear face which could lead to trauma injuries. Experimental investigations are usually complemented by numerical simulation studies which allow the examination of numerous and complex configurations (material types, thicknesses, ordering, ammunition types, etc.) and offer a salient tool for optimization of protective structures. Furthermore, local information on the dynamic mechanical response of the protection and ammunition at impact can be analyzed. The use of numerical simulations requires a faithful modeling of failure mechanisms and constitutive laws of materials of interest. In order to get precise models, it is important to conduct characterization studies taking into account i/ the thermomechanical history induced by the manufacturing process of materials and ii/ the loading conditions encountered during ballistic tests (large deformations, high strain rates, high temperature). Many studies have been conducted on protective materials but fewer on the threats and more specifically on soft core ammunitions.The work focuses on the experimental characterization and numerical modeling of the impact of two full metal jacket ammunitions (9mm and 7.62mm) consisting of a soft lead core encased in an outer shell made of steel alloy. Ballistic tests on a laminated, unidirectional high molecular weight polyethylene (UHMWPE) composite made of Dyneema® HB26 were carried out. In the thesis work, original experimental tests have been developed as well as a numerical tool which can reproduce phenomena occurring during the impact.As a first step of this study, mechanical characterizations of the lead alloy core and steel jacket were conducted in quasi-static and dynamic regimes using mechanical tests developed in the thesis work. A split Hopkinson bar setup was adapted to characterize the lead alloy at high strain rates. Original quasi-static tests were set up to study the deformation and failure behavior of samples directly extracted from the jacket in its original shape, to account for the thermomechanical history of the materials composing the bullet.The obtained experimental data were used to identify different constitutive and failure models. In the case of the steel alloy jacket, an inverse method coupled to numerical simulations and an optimization algorithm was used to identify material and damage model parameters. These models were validated based on comparisons between experimental and numerical simulations of the impact on bars of core-jacket assemblies. Finally, ballistic tests were carried out for the impact of 9 mm and 7.62 mm ammunitions on Dyneema® HB26 composite targets. The obtained results were compared to numerical simulations conducted using Abaqus® Explicit. A specific attention was paid on the accurate description of the mushrooming of the 9 mm bullet and the fragmentation of the 7.62 mm. This fragmentation phenomenon was numerically described through the use of a finite element to smooth particle hydrodynamics conversion. The work is complemented by a parametric study revealing the sensitivity of the residual velocity, the damage of the bullet, and the deflection of the target to material model parameters and mesh
Beaumont, Eric. "Caractérisation cyclique d'un acier austénitique 304L pour implémentation comme matériau de noyau d'une diagonale ductile confinée". Master's thesis, Université Laval, 2017. http://hdl.handle.net/20.500.11794/27870.
Pełny tekst źródłaContemporary seismic design is constantly evolving in search of innovative and economic solutions to enhance the performance of structures during earthquakes. Buckling-restrained braces (BRBs) have evolved as an effective seismic load-resisting system, combining high lateral rigidity of concentrically braced frames with high energy dissipation capacity. However, BRBs are prone to large residual drifts, resulting from a low-post yield stiffness of the brace component. This could be resolved by using a material with a high strain hardening capacity, as the core plate material of the BRB or one of the core plates in a multi-plate configuration. This research aims at characterizing the austenetic stainless steel 304L in order to examine the feasibility of introducing this material as a core plate material oin BRBs. In this study, coupons machined from stainless steel 304L and carbon steel 350WT plates were tested under monotonic tensile loading and cyclic loading at both constant and variable cyclic strain. Results from the monotonic tensile tests showed that the 304L steel exhibits higher strain hardening and higher ductility character than the carbon steel. From these tests, a relation describing the true stress-strain behavior of the 304L steel was calibrated using image analysis techniques. Results from the constant amplitude cyclic tests showed that 304L stainless steel exhibits higher cyclic hardening with maximum cyclic stress values up to about three times that of the yield stress. On the other hand, the carbon steel showed higher low-cycle fatigue life. Results from the variable amplitude cyclic tests were used to calibrate the nonlinear kinematic-isotropic hardening model for both materials for use in a numerical simulation of the novel BRB in seismic vulnerability assessment studies.