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Yu Chen - One of the best experts on this subject based on the ideXlab platform.
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Experimental study on mechanical properties of sandwich tempered glass unidirectional composite laminate
Composite Structures, 2021Co-Authors: Yu Chen, Bin YuanAbstract:Abstract This paper presents an experimental investigation on the mechanical properties of sandwich tempered glass unidirectional composite laminate under uniformly distributed load. A total of sixty-four specimens are tested to investigate the influence of individual layer thickness of tempered glass panel (T), Bearing Length (BL), and Length of loading end (LLE). According to this experiment, the failure modes of tested specimens were observed in detail during load procedure. The effects of the three variables on the ultimate Bearing capacity, stiffness and stress distribution of sandwich tempered glass unidirectional composite laminate are discussed. The results indicate that the three variables have positive effect on Bearing capacity and secant stiffness of the sandwich tempered glass unidirectional composite laminate. And the individual layer thickness of tempered glass panel has the greatest influence on the ultimate Bearing capacity and secant stiffness of specimens. With increasing of thickness, Bearing Length and Length of loading end, the Bearing capacity and the stiffness are increased. Based on the results of parametric studies, the designed formulas are proposed to estimate the ultimate Bearing capacity of sandwich tempered glass unidirectional composite laminate under local uniformly distributed load.
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Experimental study on three-layer tempered glass panel on quadrilateral simple Bearing under local uniformly distributed load
Thin-Walled Structures, 2019Co-Authors: Yu Chen, Shaohua Han, Yuan YuanAbstract:Abstract An experiment was carried out to investigate the mechanical behaviour of three-layer tempered glass panel on quadrilateral simple Bearing against local uniformly distributed load. Sixty-four specimens with different thickness of each layer, Bearing Length and Length of loading end were tested at a slow speed 0.1 kN/s of monotonic load. It was found that all specimens failed as an entire unit, which was different from the failure mode of ordinary glass or single layer tempered glass. The Bearing capacity and secant stiffness of three-layer tempered glass panel increase with increasing of thickness, Bearing Length and Length of loading end. Among all these factors, thickness of each layer showed the strongest impact on Bearing capacity and secant stiffness of tempered glass panel, the influence from Bearing Length is negligible. A formula is proposed to calculate the Bearing capacity of three-layer tempered glass panel on quadrilateral simple Bearing under local uniformly distributed load, which shows great rationality and accuracy.
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Tests and behavior of hot-rolled channel steel sections subjected to web crippling
Journal of Constructional Steel Research, 2016Co-Authors: Yu Chen, Xixiang Chen, Chaoyang WangAbstract:Abstract Web crippling failure of hot-rolled channel steel sections could be found due to localized concentrated loads or brace reactions. This paper reports the results of an investigation into web crippling behavior of channel sections subjected to end-one-flange (EOF), interior-one-flange (IOF), end-two-flange (ETF) and interior-two-flange (ITF) loading conditions. A total of 48 channel section tests subjected to web crippling were conducted. The investigation was mainly focused on the effects of Bearing Length and web slenderness ratio of channel sections on ultimate capacity against web crippling. The tests were performed on four different sizes of channel sections. The results obtained from these tests show that as the Bearing Length increases, the web crippling ultimate capacity increases significantly. When the Bearing Length was 50 and 100 mm, the web crippling ultimate capacity of channel sections with web slenderness ratio ( h t / t ) = 18 reached its peak. When the Bearing Length was 150 mm, the web crippling ultimate capacity of channel sections with web slenderness ratio ( h t / t ) = 12.55 reached its peak. The web crippling ultimate capacity of channel sections with web slenderness ratio ( h t / t ) = 24.67 reached the minimum value. Plastic deformation developed near the mid-height of the web, and that a plastic hinge zone formed in the ultimate limit state. Finite element models have been developed and verified against the test results. The calculation equations of web crippling ultimate capacity put forward in the paper can accurately predict experimental value.
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experimental and finite element analysis research on cold formed steel lipped channel beams under web crippling
Thin-walled Structures, 2015Co-Authors: Yu Chen, Xixiang Chen, Chaoyang WangAbstract:Abstract This article presents the results of an investigation into web crippling behavior of cold-formed steel lipped channel beams subjected to end-one-flange (EOF), interior-one-flange (IOF), end-two-flange (ETF), and interior-two-flange (ITF) loading conditions. A total of 48 cold-formed steel lipped channel beams with different boundary conditions, loading conditions, Bearing Lengths, and section heights were tested. The experimental scheme, failure modes, concentrated load-general vertical deformation and strain intensity distribution curves are presented in the article. The effect of boundary condition, loading condition, Bearing Length and section height on web crippling ultimate capacity and ductility of cold-formed steel lipped channel beams was also studied. Results of these tests show that the effect of Bearing Length on the web crippling ultimate capacity in EOF and ETF loading conditions is more obvious than those in IOF and ITF loading conditions. When Bearing Length is 50, 100, and 150 mm, web crippling ultimate capacity of cold-formed steel lipped channel beams with web slenderness=78 reaches its peak. The middle web enters plasticity and form plastic hinge zone. The values of web crippling ultimate capacity in interior-flange loading conditions are larger than those in end-flange loading conditions. It is shown that the specimens in the interior-flange loading conditions have higher ultimate capacity, larger initial stiffness and better ductility than those of specimens in the end-flange loading conditions. Finite element analysis can simulate experimental failure mode and web crippling ultimate capacity. The calculation equations of web crippling ultimate capacity put forward in the article can accurately predict experimental value.
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Aluminum tubular sections subjected to web crippling
Thin-Walled Structures, 2015Co-Authors: Yu Chen, Xixiang Chen, Chaoyang WangAbstract:Abstract This paper presents the details of experimental and numerical research study on web crippling property of aluminum tubular under concentrated web crippling loadings. A total of 48 aluminum square hollow sections with different boundary conditions, loading conditions, Bearing Lengths and section heights were tested. The experimental scheme, failure modes, load–displacement curves and strain intensity distribution curves were also presented. The investigation was focused on the effects of different boundary conditions, loading conditions, Bearing Lengths and web slenderness on web crippling ultimate capacity and ductility of aluminum square hollow sections. The results obtained from the experiments are shown that the effect of Bearing Length on the web crippling ultimate capacity under End-One-Flange (EOF) and End-Two-Flange (ETF) loading and boundary conditions is more obvious than those under Interior-One-Flange (IOF) and Interior-Two-Flange (ITF) boundary and loading conditions. The web crippling ultimate capacities under EOF and ETF loading conditions decreased as the slenderness ratio increased. As the Bearing Length was 150, the web crippling ultimate capacity under IOF and ITF loading conditions reached its peak when the value of the web slenderness was minimum. The web crippling ultimate capacities of aluminum tubular with Bearing Length=50 mm and 100 mm under IOF, ITF, EOF and ETF boundary and loading conditions decreased progressively. The web crippling ultimate capacity of aluminum tubular with Bearing Length=150 mm was approximately equal. Finite element models were developed to numerically simulate the tests performed in the experimental investigations. Based on the results of the parametric study, a number of design formulas proposed in this paper can be successfully employed as a design rule for predicting web crippling ultimate capacity of aluminum tubular sections under four loading and boundary conditions.
Chaoyang Wang - One of the best experts on this subject based on the ideXlab platform.
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Tests and behavior of hot-rolled channel steel sections subjected to web crippling
Journal of Constructional Steel Research, 2016Co-Authors: Yu Chen, Xixiang Chen, Chaoyang WangAbstract:Abstract Web crippling failure of hot-rolled channel steel sections could be found due to localized concentrated loads or brace reactions. This paper reports the results of an investigation into web crippling behavior of channel sections subjected to end-one-flange (EOF), interior-one-flange (IOF), end-two-flange (ETF) and interior-two-flange (ITF) loading conditions. A total of 48 channel section tests subjected to web crippling were conducted. The investigation was mainly focused on the effects of Bearing Length and web slenderness ratio of channel sections on ultimate capacity against web crippling. The tests were performed on four different sizes of channel sections. The results obtained from these tests show that as the Bearing Length increases, the web crippling ultimate capacity increases significantly. When the Bearing Length was 50 and 100 mm, the web crippling ultimate capacity of channel sections with web slenderness ratio ( h t / t ) = 18 reached its peak. When the Bearing Length was 150 mm, the web crippling ultimate capacity of channel sections with web slenderness ratio ( h t / t ) = 12.55 reached its peak. The web crippling ultimate capacity of channel sections with web slenderness ratio ( h t / t ) = 24.67 reached the minimum value. Plastic deformation developed near the mid-height of the web, and that a plastic hinge zone formed in the ultimate limit state. Finite element models have been developed and verified against the test results. The calculation equations of web crippling ultimate capacity put forward in the paper can accurately predict experimental value.
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experimental and finite element analysis research on cold formed steel lipped channel beams under web crippling
Thin-walled Structures, 2015Co-Authors: Yu Chen, Xixiang Chen, Chaoyang WangAbstract:Abstract This article presents the results of an investigation into web crippling behavior of cold-formed steel lipped channel beams subjected to end-one-flange (EOF), interior-one-flange (IOF), end-two-flange (ETF), and interior-two-flange (ITF) loading conditions. A total of 48 cold-formed steel lipped channel beams with different boundary conditions, loading conditions, Bearing Lengths, and section heights were tested. The experimental scheme, failure modes, concentrated load-general vertical deformation and strain intensity distribution curves are presented in the article. The effect of boundary condition, loading condition, Bearing Length and section height on web crippling ultimate capacity and ductility of cold-formed steel lipped channel beams was also studied. Results of these tests show that the effect of Bearing Length on the web crippling ultimate capacity in EOF and ETF loading conditions is more obvious than those in IOF and ITF loading conditions. When Bearing Length is 50, 100, and 150 mm, web crippling ultimate capacity of cold-formed steel lipped channel beams with web slenderness=78 reaches its peak. The middle web enters plasticity and form plastic hinge zone. The values of web crippling ultimate capacity in interior-flange loading conditions are larger than those in end-flange loading conditions. It is shown that the specimens in the interior-flange loading conditions have higher ultimate capacity, larger initial stiffness and better ductility than those of specimens in the end-flange loading conditions. Finite element analysis can simulate experimental failure mode and web crippling ultimate capacity. The calculation equations of web crippling ultimate capacity put forward in the article can accurately predict experimental value.
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Aluminum tubular sections subjected to web crippling
Thin-Walled Structures, 2015Co-Authors: Yu Chen, Xixiang Chen, Chaoyang WangAbstract:Abstract This paper presents the details of experimental and numerical research study on web crippling property of aluminum tubular under concentrated web crippling loadings. A total of 48 aluminum square hollow sections with different boundary conditions, loading conditions, Bearing Lengths and section heights were tested. The experimental scheme, failure modes, load–displacement curves and strain intensity distribution curves were also presented. The investigation was focused on the effects of different boundary conditions, loading conditions, Bearing Lengths and web slenderness on web crippling ultimate capacity and ductility of aluminum square hollow sections. The results obtained from the experiments are shown that the effect of Bearing Length on the web crippling ultimate capacity under End-One-Flange (EOF) and End-Two-Flange (ETF) loading and boundary conditions is more obvious than those under Interior-One-Flange (IOF) and Interior-Two-Flange (ITF) boundary and loading conditions. The web crippling ultimate capacities under EOF and ETF loading conditions decreased as the slenderness ratio increased. As the Bearing Length was 150, the web crippling ultimate capacity under IOF and ITF loading conditions reached its peak when the value of the web slenderness was minimum. The web crippling ultimate capacities of aluminum tubular with Bearing Length=50 mm and 100 mm under IOF, ITF, EOF and ETF boundary and loading conditions decreased progressively. The web crippling ultimate capacity of aluminum tubular with Bearing Length=150 mm was approximately equal. Finite element models were developed to numerically simulate the tests performed in the experimental investigations. Based on the results of the parametric study, a number of design formulas proposed in this paper can be successfully employed as a design rule for predicting web crippling ultimate capacity of aluminum tubular sections under four loading and boundary conditions.
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Experimental and finite element analysis research on cold-formed steel lipped channel beams under web crippling
Thin-Walled Structures, 2015Co-Authors: Yu Chen, Xixiang Chen, Chaoyang WangAbstract:Abstract This article presents the results of an investigation into web crippling behavior of cold-formed steel lipped channel beams subjected to end-one-flange (EOF), interior-one-flange (IOF), end-two-flange (ETF), and interior-two-flange (ITF) loading conditions. A total of 48 cold-formed steel lipped channel beams with different boundary conditions, loading conditions, Bearing Lengths, and section heights were tested. The experimental scheme, failure modes, concentrated load-general vertical deformation and strain intensity distribution curves are presented in the article. The effect of boundary condition, loading condition, Bearing Length and section height on web crippling ultimate capacity and ductility of cold-formed steel lipped channel beams was also studied. Results of these tests show that the effect of Bearing Length on the web crippling ultimate capacity in EOF and ETF loading conditions is more obvious than those in IOF and ITF loading conditions. When Bearing Length is 50, 100, and 150 mm, web crippling ultimate capacity of cold-formed steel lipped channel beams with web slenderness=78 reaches its peak. The middle web enters plasticity and form plastic hinge zone. The values of web crippling ultimate capacity in interior-flange loading conditions are larger than those in end-flange loading conditions. It is shown that the specimens in the interior-flange loading conditions have higher ultimate capacity, larger initial stiffness and better ductility than those of specimens in the end-flange loading conditions. Finite element analysis can simulate experimental failure mode and web crippling ultimate capacity. The calculation equations of web crippling ultimate capacity put forward in the article can accurately predict experimental value.
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Test on pultruded GFRP I-section under web crippling
Composites Part B: Engineering, 2015Co-Authors: Yu Chen, Chaoyang WangAbstract:Abstract This paper presents the details of experimental and numerical research study on web crippling property of pultruded GFRP I-section under concentrated web crippling loadings. A total of 12 pultruded GFRP I-section with different loading conditions and Bearing Lengths was tested. The experimental scheme, failure modes and load–displacement curves were also presented. The investigation was focused on the effects of different loading condition and Bearing Length on web crippling ultimate capacity and ductility of pultruded GFRP I-section. The failure mode comprised longitudinal bending main crack, bending wrinkling cracks and shear cracks. Specimens with interior Bearing load had slightly higher ultimate strength and greater deformation capacity than those of specimens with end Bearing load. The ultimate strengths usually decreased with the increase of the Bearing Length except IG condition. Finite element models were developed to numerically simulate the tests performed in the experimental investigations by using commercial ABAQUS software. Based on the results of the parametric study, a number of design formulas proposed in this paper can be successfully employed as a design rule for predicting web crippling ultimate capacity of pultruded GFRP I-section under four loading and boundary conditions by using single parameter analysis.
Bo Suk Yang - One of the best experts on this subject based on the ideXlab platform.
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Vibration reduction optimum design of a steam-turbine rotor-Bearing system using a hybrid genetic algorithm
Structural and Multidisciplinary Optimization, 2005Co-Authors: Bo Suk Yang, S.p. Choi, Y.c. KimAbstract:This paper describes the vibration optimum design for the low-pressure steam-turbine rotor of a 1007-MW nuclear power plant by using a hybrid genetic algorithm (HGA) that combines a genetic algorithm and a local concentration search algorithm using a modified simplex method. This algorithm not only calculates the optimum solution faster and more accurately than the standard genetic algorithm but can also find the global and local optimum solutions. The objective function is to minimize the resonance response (Q-factor) of the second occurring mode in the excessive vibration. Under the constraints of shaft diameter, Bearing Length and clearance, these factors play a very important role in the design of a rotor-Bearing system. In the present work, the shaft diameter, Bearing Length and clearance are chosen as the design variables. The results show that the HGA can reduce the excessive response at the critical speed and improve the stability.
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Optimal Design of Rotor-Bearing Systems Using Immune-Genetic Algorithm
Journal of Vibration and Acoustics, 2001Co-Authors: Byeong-keun Choi, Bo Suk YangAbstract:In this paper, the new combined algorithm (Immune-Genetic Algorithm, IGA) is applied to minimize the total weight of the shaft and the resonance response (Q factor), and to yield the critical speeds as far from the operating speed as possible. These factors play very important roles in designing a rotor-Bearing system under the dynamic behavior constraints. The shaft diameter, the Bearing Length and clearance are chosen as the design variables. The results show that the IGA can reduce the weight of the shaft and improve the critical speed and Q factor with dynamic constraints.
Y.c. Kim - One of the best experts on this subject based on the ideXlab platform.
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Vibration reduction optimum design of a steam-turbine rotor-Bearing system using a hybrid genetic algorithm
Structural and Multidisciplinary Optimization, 2005Co-Authors: Bo Suk Yang, S.p. Choi, Y.c. KimAbstract:This paper describes the vibration optimum design for the low-pressure steam-turbine rotor of a 1007-MW nuclear power plant by using a hybrid genetic algorithm (HGA) that combines a genetic algorithm and a local concentration search algorithm using a modified simplex method. This algorithm not only calculates the optimum solution faster and more accurately than the standard genetic algorithm but can also find the global and local optimum solutions. The objective function is to minimize the resonance response (Q-factor) of the second occurring mode in the excessive vibration. Under the constraints of shaft diameter, Bearing Length and clearance, these factors play a very important role in the design of a rotor-Bearing system. In the present work, the shaft diameter, Bearing Length and clearance are chosen as the design variables. The results show that the HGA can reduce the excessive response at the critical speed and improve the stability.
Bin Yuan - One of the best experts on this subject based on the ideXlab platform.
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Experimental study on mechanical properties of sandwich tempered glass unidirectional composite laminate
Composite Structures, 2021Co-Authors: Yu Chen, Bin YuanAbstract:Abstract This paper presents an experimental investigation on the mechanical properties of sandwich tempered glass unidirectional composite laminate under uniformly distributed load. A total of sixty-four specimens are tested to investigate the influence of individual layer thickness of tempered glass panel (T), Bearing Length (BL), and Length of loading end (LLE). According to this experiment, the failure modes of tested specimens were observed in detail during load procedure. The effects of the three variables on the ultimate Bearing capacity, stiffness and stress distribution of sandwich tempered glass unidirectional composite laminate are discussed. The results indicate that the three variables have positive effect on Bearing capacity and secant stiffness of the sandwich tempered glass unidirectional composite laminate. And the individual layer thickness of tempered glass panel has the greatest influence on the ultimate Bearing capacity and secant stiffness of specimens. With increasing of thickness, Bearing Length and Length of loading end, the Bearing capacity and the stiffness are increased. Based on the results of parametric studies, the designed formulas are proposed to estimate the ultimate Bearing capacity of sandwich tempered glass unidirectional composite laminate under local uniformly distributed load.