The Experts below are selected from a list of 31509 Experts worldwide ranked by ideXlab platform
Xiaoming Wang - One of the best experts on this subject based on the ideXlab platform.
-
microstructure based numerical simulation of the mechanical properties and fracture of a ti al3ti core shell structured particulate reinforced a356 composite
Materials & Design, 2020Co-Authors: Xuezheng Zhang, T J Chen, Xiaoming WangAbstract:Abstract A microstructure-based numerical simulation is performed to understand the mechanical properties and fracture of a Ti-Al3Ti core-shell structured particulate reinforced A356 composite ((Ti-Al3Ti)cs/A356). A series of two-dimensional (2D) representative volume element (RVE) models are generated automatically by embedding Ti-Al3Ti core-shell structured Particulates in an A356 matrix. Microstructure-based 2D RVE of monolithic Al3Ti particulate reinforced A356 composite (Al3Tip/A356) is also simulated for comparison. The ductile fracture of both Ti core and A356 matrix as well as the brittle fracture of the Al3Ti shell are considered. The simulation confirms that the high elongation of the (Ti-Al3Ti)cs/A356 composite is attributed to the uniform distribution of the overall ductile globular reinforcing Particulates, which prevent a premature failure effectively by reducing local stress concentration both on and inside the core-shell structured Particulates. The surrounding ductile phases of the Al3Ti shell blunt the crack tips effectively and, therefore, restricting the propagation of the cracks in a nominal strain range of 2.2%–6.1%. For both (Ti-Al3Ti)cs/A356 and Al3Tip/A356 composites, the simulation results are in good agreement with microstructural observations during an in-situ tensile test in a scanning electron microscope.
Xuezheng Zhang - One of the best experts on this subject based on the ideXlab platform.
-
microstructure based numerical simulation of the mechanical properties and fracture of a ti al3ti core shell structured particulate reinforced a356 composite
Materials & Design, 2020Co-Authors: Xuezheng Zhang, T J Chen, Xiaoming WangAbstract:Abstract A microstructure-based numerical simulation is performed to understand the mechanical properties and fracture of a Ti-Al3Ti core-shell structured particulate reinforced A356 composite ((Ti-Al3Ti)cs/A356). A series of two-dimensional (2D) representative volume element (RVE) models are generated automatically by embedding Ti-Al3Ti core-shell structured Particulates in an A356 matrix. Microstructure-based 2D RVE of monolithic Al3Ti particulate reinforced A356 composite (Al3Tip/A356) is also simulated for comparison. The ductile fracture of both Ti core and A356 matrix as well as the brittle fracture of the Al3Ti shell are considered. The simulation confirms that the high elongation of the (Ti-Al3Ti)cs/A356 composite is attributed to the uniform distribution of the overall ductile globular reinforcing Particulates, which prevent a premature failure effectively by reducing local stress concentration both on and inside the core-shell structured Particulates. The surrounding ductile phases of the Al3Ti shell blunt the crack tips effectively and, therefore, restricting the propagation of the cracks in a nominal strain range of 2.2%–6.1%. For both (Ti-Al3Ti)cs/A356 and Al3Tip/A356 composites, the simulation results are in good agreement with microstructural observations during an in-situ tensile test in a scanning electron microscope.
T J Chen - One of the best experts on this subject based on the ideXlab platform.
-
microstructure based numerical simulation of the mechanical properties and fracture of a ti al3ti core shell structured particulate reinforced a356 composite
Materials & Design, 2020Co-Authors: Xuezheng Zhang, T J Chen, Xiaoming WangAbstract:Abstract A microstructure-based numerical simulation is performed to understand the mechanical properties and fracture of a Ti-Al3Ti core-shell structured particulate reinforced A356 composite ((Ti-Al3Ti)cs/A356). A series of two-dimensional (2D) representative volume element (RVE) models are generated automatically by embedding Ti-Al3Ti core-shell structured Particulates in an A356 matrix. Microstructure-based 2D RVE of monolithic Al3Ti particulate reinforced A356 composite (Al3Tip/A356) is also simulated for comparison. The ductile fracture of both Ti core and A356 matrix as well as the brittle fracture of the Al3Ti shell are considered. The simulation confirms that the high elongation of the (Ti-Al3Ti)cs/A356 composite is attributed to the uniform distribution of the overall ductile globular reinforcing Particulates, which prevent a premature failure effectively by reducing local stress concentration both on and inside the core-shell structured Particulates. The surrounding ductile phases of the Al3Ti shell blunt the crack tips effectively and, therefore, restricting the propagation of the cracks in a nominal strain range of 2.2%–6.1%. For both (Ti-Al3Ti)cs/A356 and Al3Tip/A356 composites, the simulation results are in good agreement with microstructural observations during an in-situ tensile test in a scanning electron microscope.
T S Srivatsan - One of the best experts on this subject based on the ideXlab platform.
-
the compressive deformation and impact response of a magnesium alloy influence of reinforcement
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2005Co-Authors: M Jayamathy, Satish V Kailas, K Kumar, S Seshan, T S SrivatsanAbstract:Reinforcement of magnesium alloys with ceramic Particulates has engineered a new family of materials that are marketed under the trade name metal matrix composites. In this paper is reported the results of a study aimed at understanding the role of particulate reinforcements on compressive deformation and impact response of a magnesium alloy discontinuously-reinforced with silicon carbide (SiC) Particulates. An increase in carbide particulate reinforcement content in the magnesium alloy metal matrix was observed to have only a marginal influence on compressive strength and impact energy absorption when compared to the unreinforced counterpart. Microcracking in the metal matrix coupled with failure of the reinforcing SiC Particulates both independently dispersed and in clusters dominated the fracture sequence at the microscopic level. The mechanical response of this composite material is discussed in light of the interactive influences of intrinsic microstructural effects, deformation characteristics of the composite constituents, nature of loading and local stress state.
-
influence of silicon carbide particulate reinforcement on quasi static and cyclic fatigue fracture behavior of 6061 aluminum alloy composites
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2002Co-Authors: T S Srivatsan, Meslet Alhajri, M Petraroli, Bruce A Hotton, Paul C LamAbstract:In this paper, the quasi-static and cyclic fatigue fracture behavior of aluminum alloy 6061 discontinuously-reinforced with fine Particulates of silicon carbide are presented and discussed. The discontinuous particulate-reinforced 6061 aluminum alloy was cyclically deformed to failure at ambient temperature under stress-amplitude controlled conditions. The influence of volume fraction of particulate reinforcement on high cycle fatigue response is presented. The underlying mechanisms governing the fracture behavior during quasi-static and cyclic fatigue deformation are discussed and rationalized in light of concurrent and mutually interactive influences of composite microstructural features, deformation characteristics of the metal matrix and reinforcement particulate, nature of loading and ductility of the microstructure.
Umit Ozgur Koylu - One of the best experts on this subject based on the ideXlab platform.
-
diesel engine particulate emissions a comparison of mobility and microscopy size measurements
Proceedings of the Combustion Institute, 2007Co-Authors: Matthew F Chandler, Yingwu Teng, Umit Ozgur KoyluAbstract:Abstract Sub-micron Particulates emitted from diesel engines have serious negative effects on human health and environment. Accurate characterizations of such particulate matter based on independent diagnostic techniques are necessary to monitor, regulate, and model atmospheric pollution levels. The relevant sizes, in addition to mass, are of special interest as they determine the transport, toxic, optical, chemical, and deposition properties of Particulates. While there is abundant information in the aerosol literature on the apparent size distributions of diesel Particulates measured with mobility sizers, it is unclear how well such commercial instruments can characterize aggregated particles due to spherical interpretation and potential alterations of physical properties within extensive sampling and dilution lines. In this study, these experimental concerns were assessed by comparing equivalent size measurements from a differential mobility analyzer to the actual physical dimensions and morphologies obtained from direct TEM observations of Particulates sampled from the exhaust of a diesel engine with rapid thermophoretic deposition technique. Because mobility analyzers yield an overall equivalent particulate size, the measured mobility sizes were much larger than the microscopy spherule diameters, which dictate the available surface area for their interactions with the surrounding atmosphere. Mobility size distributions were also narrower with smaller sizes compared to the TEM aggregate measurements. The average mobility diameters were found to be approximately half the average microscopy aggregate gyration diameters for the present diesel engine operating conditions. Some of the differences in fractal dimension of diesel soot aggregates were also discussed in view of the present experimental results.
