The Experts below are selected from a list of 9528 Experts worldwide ranked by ideXlab platform
Wu Yitao - One of the best experts on this subject based on the ideXlab platform.
-
Synergistic Damage Mechanic Model for Stiffness Properties of Early Fatigue Damage in Composite Laminates
Procedia Engineering, 2014Co-Authors: Shen Haojie, Yao Weixing, Wu YitaoAbstract:Abstract In the initial period of the life in the composite laminates, the principal types of damage are diffused ones, such as matrix crack, diffused fiber breaking and local delamination. On account of these diffused damages, a synergistic damage Mechanic Model was proposed for the stiffness properties. The Model included the microcosmic responses of the physical damage and macroscopic performance of the material's stiffness. In micro-level, mesoscopic RVE(representative volume element) Model was established to obtain crack opening displacement and crack sliding displacement, which were used to define the damage tensor. In macro- level, through homogenizing the material strain and the surface displacement of the damage, the relationship of the stiffness matrix of unidirectional laminate or laminates in damage statue and damage tense was set up. Due to restriction of NDT (non- destructive testing) technology development, only the constitutive relations of matrix cracks were constructed. The influences of the transverse matrix cracks on the stiffness properties of the laminates [0/±45]s was analyzed with the present Model and showed that it is capable to predict the reduction of the stiffness properties resulted from the fatigue diffused damage in the laminates.
-
XVII International Colloquium on Mechanical Fatigue of Metals (ICMFM17) Synergistic Damage Mechanic Model for Stiffness Properties of Early Fatigue Damage in Composite Laminates
2014Co-Authors: Shen Haojie, Yao Weixing, Wu YitaoAbstract:In the initial period of the life in the composite laminates, the principal types of damage are diffused ones, such as matrix crack, diffused fiber breaking and local delamination. On account of these diffused damages, a synergistic damage Mechanic Model was proposed for the stiffness properties. The Model included the microcosmic responses of the physical damage and macroscopic performance of the material’s stiffness. In micro-level, mesoscopic RVE(representative volume element) Model was established to obtain crack opening displacement and crack sliding displacement, which were used to define the damage tensor. In macrolevel, through homogenizing the material strain and the surface displacement of the damage, the relationship of the stiffness matrix of unidirectional laminate or laminates in damage statue and damage tense was set up. Due to restriction of NDT (nondestructive testing) technology development, only the constitutive relations of matrix cracks were constructed. The influences of the transverse matrix cracks on the stiffness properties of the laminates [0/±45]s was analyzed with the present Model and showed that it is capable to predict the reduction of the stiffness properties resulted from the fatigue diffused damage in the laminates. © 2014 The Authors. Published by Elsevier Ltd. Selection and peer-review under responsibility of the Politecnico di Milano, Dipartimento di Meccanica.
Xia Fantian - One of the best experts on this subject based on the ideXlab platform.
-
Modeling and simulation of loop forming mechanism of computerized flat knitting machine based on UG NX/Motion
Textile Research Journal, 2013Co-Authors: Xia FantianAbstract:It is obvious that there is a technological gap between domestic made computerized flat knitting machines and foreign ones,and systematically theoretical analysis is deficient in China.For this reason,research on Modeling of the loop forming mechanism of the computerized flat knitting machine is carried out in order to improve its all-round performance.A transient Mechanic Model of the loop forming mechanism was established to investigate the variation of the impact force in vertical direction between the cam and the master jack based on UG NX/Motion.Movement simulation of the loop forming mechanism was conducted based on UG NX analytical software and in order to improve the stability of the movement of the knitting needles,the variation of the master jack′s displacement,velocity,and acceleration was analyzed and related experiments were undertaken.It was found that the analytical results obtained by using finite element analysis agree with the actual values,confirming the correctness of the transient dynamics′ analysis of loop forming mechanism.This research has provided a theoretical basis for the design and optimization of computerized flat knitting machines.
Fan Tian Xia - One of the best experts on this subject based on the ideXlab platform.
-
Dynamic Research of Knitting Element for Computerized Flat Knitting Machine Based on ANSYS/LS-DYNA
Advanced Materials Research, 2012Co-Authors: Yuan Fang, Fan Tian XiaAbstract:Based on research on the knitting processes, an impact Mechanic Model for knitting elements was established to investigate the variation of the impact force in vertical direction between the cam and the select jack. The variation of the displacement, velocity, acceleration of the select jack and the stability for the needles’ moving has been confirmed by the simulation of knitting process based on the software ANSYS/LS-DYNA. Furthermore, the variation of the select jack has been confirmed by experimental measurement during the knitting process. The data of the experiment results were in accordance with the ANSYS’ simulation which verified the correctness of the ANSYS’ analysis. It provided a theoretic basis for the design of computerized flat knitting machines.
Shen Haojie - One of the best experts on this subject based on the ideXlab platform.
-
Synergistic Damage Mechanic Model for Stiffness Properties of Early Fatigue Damage in Composite Laminates
Procedia Engineering, 2014Co-Authors: Shen Haojie, Yao Weixing, Wu YitaoAbstract:Abstract In the initial period of the life in the composite laminates, the principal types of damage are diffused ones, such as matrix crack, diffused fiber breaking and local delamination. On account of these diffused damages, a synergistic damage Mechanic Model was proposed for the stiffness properties. The Model included the microcosmic responses of the physical damage and macroscopic performance of the material's stiffness. In micro-level, mesoscopic RVE(representative volume element) Model was established to obtain crack opening displacement and crack sliding displacement, which were used to define the damage tensor. In macro- level, through homogenizing the material strain and the surface displacement of the damage, the relationship of the stiffness matrix of unidirectional laminate or laminates in damage statue and damage tense was set up. Due to restriction of NDT (non- destructive testing) technology development, only the constitutive relations of matrix cracks were constructed. The influences of the transverse matrix cracks on the stiffness properties of the laminates [0/±45]s was analyzed with the present Model and showed that it is capable to predict the reduction of the stiffness properties resulted from the fatigue diffused damage in the laminates.
-
XVII International Colloquium on Mechanical Fatigue of Metals (ICMFM17) Synergistic Damage Mechanic Model for Stiffness Properties of Early Fatigue Damage in Composite Laminates
2014Co-Authors: Shen Haojie, Yao Weixing, Wu YitaoAbstract:In the initial period of the life in the composite laminates, the principal types of damage are diffused ones, such as matrix crack, diffused fiber breaking and local delamination. On account of these diffused damages, a synergistic damage Mechanic Model was proposed for the stiffness properties. The Model included the microcosmic responses of the physical damage and macroscopic performance of the material’s stiffness. In micro-level, mesoscopic RVE(representative volume element) Model was established to obtain crack opening displacement and crack sliding displacement, which were used to define the damage tensor. In macrolevel, through homogenizing the material strain and the surface displacement of the damage, the relationship of the stiffness matrix of unidirectional laminate or laminates in damage statue and damage tense was set up. Due to restriction of NDT (nondestructive testing) technology development, only the constitutive relations of matrix cracks were constructed. The influences of the transverse matrix cracks on the stiffness properties of the laminates [0/±45]s was analyzed with the present Model and showed that it is capable to predict the reduction of the stiffness properties resulted from the fatigue diffused damage in the laminates. © 2014 The Authors. Published by Elsevier Ltd. Selection and peer-review under responsibility of the Politecnico di Milano, Dipartimento di Meccanica.
Yuan Fang - One of the best experts on this subject based on the ideXlab platform.
-
Dynamic Research of Knitting Element for Computerized Flat Knitting Machine Based on ANSYS/LS-DYNA
Advanced Materials Research, 2012Co-Authors: Yuan Fang, Fan Tian XiaAbstract:Based on research on the knitting processes, an impact Mechanic Model for knitting elements was established to investigate the variation of the impact force in vertical direction between the cam and the select jack. The variation of the displacement, velocity, acceleration of the select jack and the stability for the needles’ moving has been confirmed by the simulation of knitting process based on the software ANSYS/LS-DYNA. Furthermore, the variation of the select jack has been confirmed by experimental measurement during the knitting process. The data of the experiment results were in accordance with the ANSYS’ simulation which verified the correctness of the ANSYS’ analysis. It provided a theoretic basis for the design of computerized flat knitting machines.