The Experts below are selected from a list of 31929 Experts worldwide ranked by ideXlab platform
Gilles Rousselier - One of the best experts on this subject based on the ideXlab platform.
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Modeling of large strain multi-Axial Deformation of anisotropic metal sheets with strength-differential effect using a Reduced Texture Methodology
International Journal of Plasticity, 2014Co-Authors: Gilles RousselierAbstract:This paper works on the macroscopic modeling of the anisotropic plasticity of a 6260-T6 thin-walled aluminum extrusion with a focus on the large strain multi-Axial Deformation with Strength-Differential Effect (SDE). Based on the framework of the self-consistent polycrystalline plasticity, the recently developed Reduced Texture Methodology (RTM) (Rousselier et al., 2012) is employed to provide the computational efficiency needed for industrial applications while keeping the physically-based nature of the plasticity model. In particular, the new model features a novel hardening law at slip-system level to better capture large strain behaviors, as well as a generic method designed to describe the stress/strain history effect. All model parameters (including texture) are identified from mechanical experiments using a special optimization procedure. An extensive experimental program covering more than 30 distinct multi-Axial stress states with both proportional and non-proportional loadings is used to calibrate and validate the present model. Both full- and reduced-thickness specimens are tested to capture the through-thickness heterogeneity of texture and grain size. It is shown that the present model predicts well the stress-strain responses in most of the multi-Axial loading conditions which have been tested. Moreover, the model is able to capture various interesting behaviors of the present material during plastic Deformation, including anisotropy, through-thickness heterogeneity, SDE of tension/compression or shear, and cross-hardening during non-proportional loadings. Furthermore, successful simulation of two structural level tests including a circular punch indentation and a three-point bending shows the applicability and potential of the new model in industrial practices.
Yingchuan Chen - One of the best experts on this subject based on the ideXlab platform.
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development of steel dual core self centering braces quasi static cyclic tests and finite element analyses
Earthquake Spectra, 2015Co-Authors: Chungche Chou, Yingchuan ChenAbstract:This work presents mechanics, tests, and finite element analyses of a novel steel dual-core self-centering brace (SCB) with flag-shaped re-centering responses. The Axial Deformation capacity of the...
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development of steel dual core self centering braces quasi static cyclic tests and finite element analyses
Earthquake Spectra, 2015Co-Authors: Chungche Chou, Yingchuan ChenAbstract:This work presents mechanics, tests, and finite element analyses of a novel steel dual-core self-centering brace (SCB) with flag-shaped re-centering responses. The Axial Deformation capacity of the brace is doubled with respect to the SCED brace by serial Deformations of two sets of parallel tensioning elements when both braces use the same tensioning elements. The mechanics of the brace is first explained; six tensioning elements and four dual-core SCBs are tested to evaluate their cyclic performance. The braces exhibit excellent performance up to a drift of 2% with a maximum Axial force around 1,400 kN. The braces also survive 15 low-cycle fatigue tests at a drift of 1.5%. Tensioning elements fail when the braces are overloaded to 2.5–3% drift. Finite element analysis is conducted to further verify hysteretic responses of the dual-core SCB in cyclic tests. A design procedure for the proposed dual-core SCB is also included in the paper.
Ilchat Sabirov - One of the best experts on this subject based on the ideXlab platform.
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Anisotropy of uni-Axial and bi-Axial Deformation behavior of pure Titanium after hydrostatic extrusion
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013Co-Authors: E.c. Moreno-valle, B. Savoini, Wacek Pachla, Mariusz Kulczyk, Marco Antonio Sotelo Monge, Carmen Ballesteros, Ilchat SabirovAbstract:Abstract Coarse-grained commercially pure (CP) Titanium is subjected to hydrostatic extrusion resulting in the formation of ultrafine lamellar-type microstructure having very strong fiber texture. Uni-Axial tensile tests of longitudinal and transverse specimens are carried out to study anisotropy of uni-Axial Deformation behavior of hydrostatically extruded CP Titanium. Small punch testing of longitudinal and transverse specimens is performed to study the anisotropy of its bi-Axial Deformation behavior. It is demonstrated that there is significant anisotropy of both uni-Axial and bi-Axial Deformation of CP Titanium after hydrostatic extrusion which is related to the specific microstructure and texture developed in the material during hydrostatic extrusion.
Chang Choi - One of the best experts on this subject based on the ideXlab platform.
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Study on a novel thermal error compensation system for high-precision ball screw feed drive (2^nd report: Experimental verification)
International Journal of Precision Engineering and Manufacturing, 2015Co-Authors: Chang Choi, Longjun Liang, Sungki LyuAbstract:Real-time thermal error compensation of machine tool feed drive in general can be separated into three steps such as modeling, measurement and compensation. In the previous report, as the parts of the thermal error compensation system, component heat generation, compensation method, thermal model, mathematic model and calculation method were studied respectively. And a series of simulations was carried out in several kinds of working condition. And then, in order to discuss the correctness of the developed ball screw thermal error compensation system, a series of tests contains Axial Deformation, positioning accuracy, temperature variation and temperature distribution was carried out in the same working condition of prediction. As the results, the test data well confirmed the correctness of the developed ball screw thermal error compensation system.
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study on a novel thermal error compensation system for high precision ball screw feed drive 2nd report experimental verification
International Journal of Precision Engineering and Manufacturing, 2015Co-Authors: Chang Choi, Longjun Liang, Sungki LyuAbstract:Real-time thermal error compensation of machine tool feed drive in general can be separated into three steps such as modeling, measurement and compensation. In the previous report, as the parts of the thermal error compensation system, component heat generation, compensation method, thermal model, mathematic model and calculation method were studied respectively. And a series of simulations was carried out in several kinds of working condition. And then, in order to discuss the correctness of the developed ball screw thermal error compensation system, a series of tests contains Axial Deformation, positioning accuracy, temperature variation and temperature distribution was carried out in the same working condition of prediction. As the results, the test data well confirmed the correctness of the developed ball screw thermal error compensation system.
Sungki Lyu - One of the best experts on this subject based on the ideXlab platform.
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Study on a novel thermal error compensation system for high-precision ball screw feed drive (2^nd report: Experimental verification)
International Journal of Precision Engineering and Manufacturing, 2015Co-Authors: Chang Choi, Longjun Liang, Sungki LyuAbstract:Real-time thermal error compensation of machine tool feed drive in general can be separated into three steps such as modeling, measurement and compensation. In the previous report, as the parts of the thermal error compensation system, component heat generation, compensation method, thermal model, mathematic model and calculation method were studied respectively. And a series of simulations was carried out in several kinds of working condition. And then, in order to discuss the correctness of the developed ball screw thermal error compensation system, a series of tests contains Axial Deformation, positioning accuracy, temperature variation and temperature distribution was carried out in the same working condition of prediction. As the results, the test data well confirmed the correctness of the developed ball screw thermal error compensation system.
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study on a novel thermal error compensation system for high precision ball screw feed drive 2nd report experimental verification
International Journal of Precision Engineering and Manufacturing, 2015Co-Authors: Chang Choi, Longjun Liang, Sungki LyuAbstract:Real-time thermal error compensation of machine tool feed drive in general can be separated into three steps such as modeling, measurement and compensation. In the previous report, as the parts of the thermal error compensation system, component heat generation, compensation method, thermal model, mathematic model and calculation method were studied respectively. And a series of simulations was carried out in several kinds of working condition. And then, in order to discuss the correctness of the developed ball screw thermal error compensation system, a series of tests contains Axial Deformation, positioning accuracy, temperature variation and temperature distribution was carried out in the same working condition of prediction. As the results, the test data well confirmed the correctness of the developed ball screw thermal error compensation system.
