The Experts below are selected from a list of 114660 Experts worldwide ranked by ideXlab platform
Weilong Cong - One of the best experts on this subject based on the ideXlab platform.
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a mechanistic cutting force model based on ductile and brittle Fracture Material removal modes for edge surface grinding of cfrp composites using rotary ultrasonic machining
International Journal of Mechanical Sciences, 2020Co-Authors: Hui Wang, Z J Pei, Weilong CongAbstract:Abstract Rotary ultrasonic machining (RUM) has been proven to be an effective method for surface grinding of carbon fiber reinforced plastic (CFRP) composites. Cutting force is considered as the main criterion to evaluate the performance of RUM surface grinding process. The cutting force modeling is essential to better understand such a process. All reported cutting force models for RUM of CFRP are developed based on brittle Fracture Material removal mode (brittle mode). However, it is recently found that both ductile Material removal mode (ductile mode) and brittle mode exist in RUM of CFRP. Among surface grinding processes, edge surface grinding is the mandatory and primary process to remove an amount of composite Material from the workpiece edge to achieve the desired workpiece with high precision. In edge surface grinding process, cutting forces in both feeding direction and in depth-of-cut direction (being perpendicular to feeding direction) play important roles in Material removal. In addition, the understandings of Material removal mechanisms will greatly benefit the modeling development of cutting forces and improve the RUM process. In this study, a mechanistic model based on both ductile mode and brittle mode is developed to predict cutting forces in both feeding and depth-of-cut directions for RUM edge surface grinding of CFRP composites. A series of experiments are conducted to verify this mechanistic model. The model prediction agrees well with the experimental results under different groups of input variables.
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a mechanistic model on feeding directional cutting force in surface grinding of cfrp composites using rotary ultrasonic machining with horizontal ultrasonic vibration
International Journal of Mechanical Sciences, 2019Co-Authors: Hui Wang, Weilong CongAbstract:Abstract In surface grinding of carbon fiber reinforced plastic (CFRP) composites, cutting force is a key factor that controls surface damage, tool wear, cutting temperature, delamination, etc. Surface grinding of CFRP composites using rotary ultrasonic machining (RUM) with vertical ultrasonic vibration has been proven to be an effective method to reduce cutting force. However, the machined surface quality is lowered due to the knocking effects on the machined surface resulted from up-and-down vertical vibration. It has been proven that to decrease cutting force and simultaneously improve surface quality, ultrasonic vibration aligning with surface generation direction (feeding direction) is needed. However, there are limited investigations on RUM surface grinding of CFRP composites with horizontal ultrasonic vibration, and the mechanistic model on cutting force in such a process is not explored. This paper, for the first time, establishes a mechanistic model on feeding-directional cutting force in RUM surface grinding of CFRP composites with horizontal ultrasonic vibration. This modeling development is based on the assumption of brittle Fracture Material removal mechanism, which is the dominant removal mechanism in such a process. The predicted trends in this model agree well with those in experimentally measured results. This modeling will provide a guidance for the mechanistic modeling development to predict other output variables through the cutting force in RUM surface grinding of CFRP composites.
Hui Wang - One of the best experts on this subject based on the ideXlab platform.
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a mechanistic cutting force model based on ductile and brittle Fracture Material removal modes for edge surface grinding of cfrp composites using rotary ultrasonic machining
International Journal of Mechanical Sciences, 2020Co-Authors: Hui Wang, Z J Pei, Weilong CongAbstract:Abstract Rotary ultrasonic machining (RUM) has been proven to be an effective method for surface grinding of carbon fiber reinforced plastic (CFRP) composites. Cutting force is considered as the main criterion to evaluate the performance of RUM surface grinding process. The cutting force modeling is essential to better understand such a process. All reported cutting force models for RUM of CFRP are developed based on brittle Fracture Material removal mode (brittle mode). However, it is recently found that both ductile Material removal mode (ductile mode) and brittle mode exist in RUM of CFRP. Among surface grinding processes, edge surface grinding is the mandatory and primary process to remove an amount of composite Material from the workpiece edge to achieve the desired workpiece with high precision. In edge surface grinding process, cutting forces in both feeding direction and in depth-of-cut direction (being perpendicular to feeding direction) play important roles in Material removal. In addition, the understandings of Material removal mechanisms will greatly benefit the modeling development of cutting forces and improve the RUM process. In this study, a mechanistic model based on both ductile mode and brittle mode is developed to predict cutting forces in both feeding and depth-of-cut directions for RUM edge surface grinding of CFRP composites. A series of experiments are conducted to verify this mechanistic model. The model prediction agrees well with the experimental results under different groups of input variables.
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a mechanistic model on feeding directional cutting force in surface grinding of cfrp composites using rotary ultrasonic machining with horizontal ultrasonic vibration
International Journal of Mechanical Sciences, 2019Co-Authors: Hui Wang, Weilong CongAbstract:Abstract In surface grinding of carbon fiber reinforced plastic (CFRP) composites, cutting force is a key factor that controls surface damage, tool wear, cutting temperature, delamination, etc. Surface grinding of CFRP composites using rotary ultrasonic machining (RUM) with vertical ultrasonic vibration has been proven to be an effective method to reduce cutting force. However, the machined surface quality is lowered due to the knocking effects on the machined surface resulted from up-and-down vertical vibration. It has been proven that to decrease cutting force and simultaneously improve surface quality, ultrasonic vibration aligning with surface generation direction (feeding direction) is needed. However, there are limited investigations on RUM surface grinding of CFRP composites with horizontal ultrasonic vibration, and the mechanistic model on cutting force in such a process is not explored. This paper, for the first time, establishes a mechanistic model on feeding-directional cutting force in RUM surface grinding of CFRP composites with horizontal ultrasonic vibration. This modeling development is based on the assumption of brittle Fracture Material removal mechanism, which is the dominant removal mechanism in such a process. The predicted trends in this model agree well with those in experimentally measured results. This modeling will provide a guidance for the mechanistic modeling development to predict other output variables through the cutting force in RUM surface grinding of CFRP composites.
Z J Pei - One of the best experts on this subject based on the ideXlab platform.
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a mechanistic cutting force model based on ductile and brittle Fracture Material removal modes for edge surface grinding of cfrp composites using rotary ultrasonic machining
International Journal of Mechanical Sciences, 2020Co-Authors: Hui Wang, Z J Pei, Weilong CongAbstract:Abstract Rotary ultrasonic machining (RUM) has been proven to be an effective method for surface grinding of carbon fiber reinforced plastic (CFRP) composites. Cutting force is considered as the main criterion to evaluate the performance of RUM surface grinding process. The cutting force modeling is essential to better understand such a process. All reported cutting force models for RUM of CFRP are developed based on brittle Fracture Material removal mode (brittle mode). However, it is recently found that both ductile Material removal mode (ductile mode) and brittle mode exist in RUM of CFRP. Among surface grinding processes, edge surface grinding is the mandatory and primary process to remove an amount of composite Material from the workpiece edge to achieve the desired workpiece with high precision. In edge surface grinding process, cutting forces in both feeding direction and in depth-of-cut direction (being perpendicular to feeding direction) play important roles in Material removal. In addition, the understandings of Material removal mechanisms will greatly benefit the modeling development of cutting forces and improve the RUM process. In this study, a mechanistic model based on both ductile mode and brittle mode is developed to predict cutting forces in both feeding and depth-of-cut directions for RUM edge surface grinding of CFRP composites. A series of experiments are conducted to verify this mechanistic model. The model prediction agrees well with the experimental results under different groups of input variables.
Veljkovic M. - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of high strength steels Fracture based on uniaxial stress-strain curves
'Elsevier BV', 2021Co-Authors: Xin H., Veljkovic M.Abstract:Predicting the ultimate capacity of components made of high strength steel (HSS) is a numerically challenging task. The Fracture performance of HSS from different steel grades, producers, and manufacturing processes (rolling, cold forming, etc.) varies greatly. It is costly to conduct a series of experiments for each typical HSS structural component to identify the parameters of the Fracture model. An attempt is made to evaluate the Fracture Material properties based only on the standardized uniaxial stress-strain curve. The uncoupled Fracture model was implemented through a user subroutine VUMAT (ABAQUS) to evaluate the ductile Fracture of HSS, where a rate-independent non-linear isotropic J2 hardening model is used in combination with a separate Hosford-Coulomb Fracture model. The detailed procedure to identify the Material parameters based on only the uniaxial stress-strain curve of steel grades S700 and S960 are provided for the sake of illustration of possible applications. The proposed Fracture model and identified parameters are validated based on the experimental results of the HSS plate with different hole sizes in the middle of the dog bone specimens. Besides, a desktop study of a single K gap joint with β = 0.5 made of square hollow sections using S700 and S960 is used to illustrate a possible application of the Fracture model in a simplified model of the structural joint.Steel & Composite Structure
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Evaluation of high strength steels Fracture based on uniaxial stress-strain curves
'Elsevier BV', 2021Co-Authors: Xin H., Veljkovic M.Abstract:Predicting the ultimate capacity of components made of high strength steel (HSS) is a numerically challenging task. The Fracture performance of HSS from different steel grades, producers, and manufacturing processes (rolling, cold forming, etc.) varies greatly. It is costly to conduct a series of experiments for each typical HSS structural component to identify the parameters of the Fracture model. An attempt is made to evaluate the Fracture Material properties based only on the standardized uniaxial stress-strain curve. The uncoupled Fracture model was implemented through a user subroutine VUMAT (ABAQUS) to evaluate the ductile Fracture of HSS, where a rate-independent non-linear isotropic J2 hardening model is used in combination with a separate Hosford-Coulomb Fracture model. The detailed procedure to identify the Material parameters based on only the uniaxial stress-strain curve of steel grades S700 and S960 are provided for the sake of illustration of possible applications. The proposed Fracture model and identified parameters are validated based on the experimental results of the HSS plate with different hole sizes in the middle of the dog bone specimens. Besides, a desktop study of a single K gap joint with β = 0.5 made of square hollow sections using S700 and S960 is used to illustrate a possible application of the Fracture model in a simplified model of the structural joint.
Xin H. - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of high strength steels Fracture based on uniaxial stress-strain curves
'Elsevier BV', 2021Co-Authors: Xin H., Veljkovic M.Abstract:Predicting the ultimate capacity of components made of high strength steel (HSS) is a numerically challenging task. The Fracture performance of HSS from different steel grades, producers, and manufacturing processes (rolling, cold forming, etc.) varies greatly. It is costly to conduct a series of experiments for each typical HSS structural component to identify the parameters of the Fracture model. An attempt is made to evaluate the Fracture Material properties based only on the standardized uniaxial stress-strain curve. The uncoupled Fracture model was implemented through a user subroutine VUMAT (ABAQUS) to evaluate the ductile Fracture of HSS, where a rate-independent non-linear isotropic J2 hardening model is used in combination with a separate Hosford-Coulomb Fracture model. The detailed procedure to identify the Material parameters based on only the uniaxial stress-strain curve of steel grades S700 and S960 are provided for the sake of illustration of possible applications. The proposed Fracture model and identified parameters are validated based on the experimental results of the HSS plate with different hole sizes in the middle of the dog bone specimens. Besides, a desktop study of a single K gap joint with β = 0.5 made of square hollow sections using S700 and S960 is used to illustrate a possible application of the Fracture model in a simplified model of the structural joint.Steel & Composite Structure
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Evaluation of high strength steels Fracture based on uniaxial stress-strain curves
'Elsevier BV', 2021Co-Authors: Xin H., Veljkovic M.Abstract:Predicting the ultimate capacity of components made of high strength steel (HSS) is a numerically challenging task. The Fracture performance of HSS from different steel grades, producers, and manufacturing processes (rolling, cold forming, etc.) varies greatly. It is costly to conduct a series of experiments for each typical HSS structural component to identify the parameters of the Fracture model. An attempt is made to evaluate the Fracture Material properties based only on the standardized uniaxial stress-strain curve. The uncoupled Fracture model was implemented through a user subroutine VUMAT (ABAQUS) to evaluate the ductile Fracture of HSS, where a rate-independent non-linear isotropic J2 hardening model is used in combination with a separate Hosford-Coulomb Fracture model. The detailed procedure to identify the Material parameters based on only the uniaxial stress-strain curve of steel grades S700 and S960 are provided for the sake of illustration of possible applications. The proposed Fracture model and identified parameters are validated based on the experimental results of the HSS plate with different hole sizes in the middle of the dog bone specimens. Besides, a desktop study of a single K gap joint with β = 0.5 made of square hollow sections using S700 and S960 is used to illustrate a possible application of the Fracture model in a simplified model of the structural joint.
