The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
Damiano Pasini - One of the best experts on this subject based on the ideXlab platform.
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experimental and numerical investigation of selective laser melting induced defects in ti 6al 4v octet truss Lattice Material the role of Material microstructure and morphological variations
Journal of Materials Research, 2020Co-Authors: Asma El Elmi, Meisam Asgari, David Melancon, Lu Liu, Damiano PasiniAbstract:The remarkable progress in additive manufacturing has promoted the design of architected Materials with mechanical properties that go beyond those of conventional solids. Their realization, however, leads to architectures with process-induced defects that can jeopardize mechanical and functional performance. In this work, we investigate experimentally and numerically as-manufactured defects in Ti–6Al–4V octet truss Lattice Materials fabricated with selective laser melting. Four sets of as-manufactured defects, including surface, microstructural, morphological, and Material property imperfections, are characterized experimentally at given locations and orientations. Within the characterized defects, Material property and morphological defects are quantified statistically using a combination of atomic force microscopy and micro–computed tomography to generate representative models that incorporate individual defects and their combination. The models are used to assess the sensitivity to as-manufactured defects. Then, the study is expanded by tuning defects amplitude to elucidate the role of the magnitude of as-designed defects on the mechanical properties of the Lattice Material.
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Experimental and numerical investigation of selective laser melting–induced defects in Ti–6Al–4V octet truss Lattice Material: the role of Material microstructure and morphological variations
Journal of Materials Research, 2020Co-Authors: Asma El Elmi, David Melancon, Meisam Asgari, Lu Liu, Damiano PasiniAbstract:The remarkable progress in additive manufacturing has promoted the design of architected Materials with mechanical properties that go beyond those of conventional solids. Their realization, however, leads to architectures with process-induced defects that can jeopardize mechanical and functional performance. In this work, we investigate experimentally and numerically as-manufactured defects in Ti–6Al–4V octet truss Lattice Materials fabricated with selective laser melting. Four sets of as-manufactured defects, including surface, microstructural, morphological, and Material property imperfections, are characterized experimentally at given locations and orientations. Within the characterized defects, Material property and morphological defects are quantified statistically using a combination of atomic force microscopy and micro–computed tomography to generate representative models that incorporate individual defects and their combination. The models are used to assess the sensitivity to as-manufactured defects. Then, the study is expanded by tuning defects amplitude to elucidate the role of the magnitude of as-designed defects on the mechanical properties of the Lattice Material.
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Comprehensive Stiffness of Prestressed Lattice Materials
Journal of Materials Science Research, 2012Co-Authors: Mostafa S. A. Elsayed, Damiano PasiniAbstract:Several approaches to obtain the comprehensive stiffness of finite frameworks are present in literature; yet, the formulation has not been addressed for Lattice Materials and infinitely periodic structures. The objective of this paper is to introduce a systematic method to calculate the comprehensive stiffness of prestressed, infinitely periodic, structures and Lattice Materials with pin- and rigid-jointed connectivity. We first derive the comprehensive stiffness of a finite framework through the superposition of its Material and nonlinear geometrical stiffness. By using the Bloch's theorem, we derive the irreducible form of the stiffness system of the finite framework, which represents the stiffness behaviour of the corresponding infinite, periodic assembly. Finally, the comprehensive stiffness of the infinite Lattice is homogenized to generate the stiffness characteristics of the Lattice Material. A detailed example is provided to show the application of the methodology. Closed-form expressions of the elastic properties are presented for 12 planar Lattices.
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Linear multiscale analysis and finite element validation of stretching and bending dominated Lattice Materials
Mechanics of Materials, 2012Co-Authors: Andrea Vigliotti, Damiano PasiniAbstract:Abstract The paper presents a multiscale procedure for the linear analysis of components made of Lattice Materials. The method allows the analysis of both pin-jointed and rigid-jointed microtruss Materials with arbitrary topology of the unit cell. At the macroscopic level, the procedure enables to determine the Lattice stiffness, while at the microscopic level the internal forces in the Lattice elements are expressed in terms of the macroscopic strain applied to the Lattice component. A numeric validation of the method is described. The procedure is completely automated and can be easily used within an optimization framework to find the optimal geometric parameters of a given Lattice Material.
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Structural Optimization of Lattice Materials
Volume 5: 37th Design Automation Conference Parts A and B, 2011Co-Authors: Andrea Vigliotti, Damiano PasiniAbstract:Lattice Materials are characterized at the microscopic level by a regular pattern of voids confined by walls. Recent rapid prototyping techniques allow their manufacturing from a wide range of solid Materials, ensuring high degrees of accuracy and limited costs. The microstructure of Lattice Material permits to obtain macroscopic properties and structural performance, such as very high stiffness to weight ratios, highly anisotropy, high specific energy dissipation capability and an extended elastic range, which cannot be attained by uniform Materials. Among several applications, Lattice Materials are of special interest for the design of morphing structures, energy absorbing components and hard tissue scaffold for biomedical prostheses. Their macroscopic mechanical properties can be finely tuned by properly selecting the Lattice topology and the Material of the walls. Nevertheless, since the number of the design parameters involved is very high, and their correlation to the final macroscopic properties of the Material is quite complex, reliable and robust multiscale mechanics analysis and design optimization tools are a necessary aid for their practical application. In this paper, the optimization of Lattice Materials parameters is illustrated with reference to the design of a bracket subjected to a point load. Given the geometric shape and the boundary conditions of the component, the parameters of four selected topologies have been optimized to concurrently maximize the component stiffness and minimize its mass.Copyright © 2011 by ASME
Craig A. Bridges - One of the best experts on this subject based on the ideXlab platform.
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Unconventional spin dynamics in the honeycomb-Lattice Material α − RuCl 3 : High-field electron spin resonance studies
Physical Review B, 2017Co-Authors: Alexey Ponomaryov, E. Schulze, J. Wosnitza, P. Lampen-kelley, Arnab Banerjee, Jiaqiang Yan, Craig A. Bridges, David Mandrus, S. E. Nagler, Alexei KolezhukAbstract:The honeycomb-Lattice Material $\ensuremath{\alpha}$-RuCl${}_{3}$ is a prime candidate for exhibiting Kitaev spin-liquid physics. Here, the authors employ high-field electron spin resonance spectroscopy to probe its spin dynamics across different regions of the phase diagram. Apart from two modes of antiferromagnetic resonance in the zigzag-ordered phase, a rich excitation spectrum was observed in the field-induced quantum disordered state. The authors compare their observations with results of recent numerical calculations, revealing a complex multiparticle nature of magnetic excitations in the field-induced phase.
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unconventional spin dynamics in the honeycomb Lattice Material α rucl 3 high field electron spin resonance studies
Physical Review B, 2017Co-Authors: Alexey Ponomaryov, E. Schulze, J. Wosnitza, Arnab Banerjee, Jiaqiang Yan, P Lampenkelley, Craig A. BridgesAbstract:The honeycomb-Lattice Material $\ensuremath{\alpha}$-RuCl${}_{3}$ is a prime candidate for exhibiting Kitaev spin-liquid physics. Here, the authors employ high-field electron spin resonance spectroscopy to probe its spin dynamics across different regions of the phase diagram. Apart from two modes of antiferromagnetic resonance in the zigzag-ordered phase, a rich excitation spectrum was observed in the field-induced quantum disordered state. The authors compare their observations with results of recent numerical calculations, revealing a complex multiparticle nature of magnetic excitations in the field-induced phase.
E. Schulze - One of the best experts on this subject based on the ideXlab platform.
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Unconventional spin dynamics in the honeycomb-Lattice Material α − RuCl 3 : High-field electron spin resonance studies
Physical Review B, 2017Co-Authors: Alexey Ponomaryov, E. Schulze, J. Wosnitza, P. Lampen-kelley, Arnab Banerjee, Jiaqiang Yan, Craig A. Bridges, David Mandrus, S. E. Nagler, Alexei KolezhukAbstract:The honeycomb-Lattice Material $\ensuremath{\alpha}$-RuCl${}_{3}$ is a prime candidate for exhibiting Kitaev spin-liquid physics. Here, the authors employ high-field electron spin resonance spectroscopy to probe its spin dynamics across different regions of the phase diagram. Apart from two modes of antiferromagnetic resonance in the zigzag-ordered phase, a rich excitation spectrum was observed in the field-induced quantum disordered state. The authors compare their observations with results of recent numerical calculations, revealing a complex multiparticle nature of magnetic excitations in the field-induced phase.
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unconventional spin dynamics in the honeycomb Lattice Material α rucl 3 high field electron spin resonance studies
Physical Review B, 2017Co-Authors: Alexey Ponomaryov, E. Schulze, J. Wosnitza, Arnab Banerjee, Jiaqiang Yan, P Lampenkelley, Craig A. BridgesAbstract:The honeycomb-Lattice Material $\ensuremath{\alpha}$-RuCl${}_{3}$ is a prime candidate for exhibiting Kitaev spin-liquid physics. Here, the authors employ high-field electron spin resonance spectroscopy to probe its spin dynamics across different regions of the phase diagram. Apart from two modes of antiferromagnetic resonance in the zigzag-ordered phase, a rich excitation spectrum was observed in the field-induced quantum disordered state. The authors compare their observations with results of recent numerical calculations, revealing a complex multiparticle nature of magnetic excitations in the field-induced phase.
J. Wosnitza - One of the best experts on this subject based on the ideXlab platform.
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Unconventional spin dynamics in the honeycomb-Lattice Material α − RuCl 3 : High-field electron spin resonance studies
Physical Review B, 2017Co-Authors: Alexey Ponomaryov, E. Schulze, J. Wosnitza, P. Lampen-kelley, Arnab Banerjee, Jiaqiang Yan, Craig A. Bridges, David Mandrus, S. E. Nagler, Alexei KolezhukAbstract:The honeycomb-Lattice Material $\ensuremath{\alpha}$-RuCl${}_{3}$ is a prime candidate for exhibiting Kitaev spin-liquid physics. Here, the authors employ high-field electron spin resonance spectroscopy to probe its spin dynamics across different regions of the phase diagram. Apart from two modes of antiferromagnetic resonance in the zigzag-ordered phase, a rich excitation spectrum was observed in the field-induced quantum disordered state. The authors compare their observations with results of recent numerical calculations, revealing a complex multiparticle nature of magnetic excitations in the field-induced phase.
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unconventional spin dynamics in the honeycomb Lattice Material α rucl 3 high field electron spin resonance studies
Physical Review B, 2017Co-Authors: Alexey Ponomaryov, E. Schulze, J. Wosnitza, Arnab Banerjee, Jiaqiang Yan, P Lampenkelley, Craig A. BridgesAbstract:The honeycomb-Lattice Material $\ensuremath{\alpha}$-RuCl${}_{3}$ is a prime candidate for exhibiting Kitaev spin-liquid physics. Here, the authors employ high-field electron spin resonance spectroscopy to probe its spin dynamics across different regions of the phase diagram. Apart from two modes of antiferromagnetic resonance in the zigzag-ordered phase, a rich excitation spectrum was observed in the field-induced quantum disordered state. The authors compare their observations with results of recent numerical calculations, revealing a complex multiparticle nature of magnetic excitations in the field-induced phase.
Alexey Ponomaryov - One of the best experts on this subject based on the ideXlab platform.
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Unconventional spin dynamics in the honeycomb-Lattice Material α − RuCl 3 : High-field electron spin resonance studies
Physical Review B, 2017Co-Authors: Alexey Ponomaryov, E. Schulze, J. Wosnitza, P. Lampen-kelley, Arnab Banerjee, Jiaqiang Yan, Craig A. Bridges, David Mandrus, S. E. Nagler, Alexei KolezhukAbstract:The honeycomb-Lattice Material $\ensuremath{\alpha}$-RuCl${}_{3}$ is a prime candidate for exhibiting Kitaev spin-liquid physics. Here, the authors employ high-field electron spin resonance spectroscopy to probe its spin dynamics across different regions of the phase diagram. Apart from two modes of antiferromagnetic resonance in the zigzag-ordered phase, a rich excitation spectrum was observed in the field-induced quantum disordered state. The authors compare their observations with results of recent numerical calculations, revealing a complex multiparticle nature of magnetic excitations in the field-induced phase.
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unconventional spin dynamics in the honeycomb Lattice Material α rucl 3 high field electron spin resonance studies
Physical Review B, 2017Co-Authors: Alexey Ponomaryov, E. Schulze, J. Wosnitza, Arnab Banerjee, Jiaqiang Yan, P Lampenkelley, Craig A. BridgesAbstract:The honeycomb-Lattice Material $\ensuremath{\alpha}$-RuCl${}_{3}$ is a prime candidate for exhibiting Kitaev spin-liquid physics. Here, the authors employ high-field electron spin resonance spectroscopy to probe its spin dynamics across different regions of the phase diagram. Apart from two modes of antiferromagnetic resonance in the zigzag-ordered phase, a rich excitation spectrum was observed in the field-induced quantum disordered state. The authors compare their observations with results of recent numerical calculations, revealing a complex multiparticle nature of magnetic excitations in the field-induced phase.
