The Experts below are selected from a list of 9369 Experts worldwide ranked by ideXlab platform

Xiongqi Peng - One of the best experts on this subject based on the ideXlab platform.

  • Development and application of Hyperelastic Model for diaphragm considering the influence of temperature
    International Journal of Computational Materials Science and Engineering, 2019
    Co-Authors: Lidong Wang, Xiongqi Peng, Mingrui Liu
    Abstract:

    The basic mechanical properties of a diaphragm under various temperatures in hot diaphragm preforming of composites are obtained by uniaxial tensile tests. A constitutive Model considering the influence of temperature is accordingly developed to characterize its large deformation behavior. Model parameters are obtained by nonlinear fitting experiment data. The constitutive Model is implemented in ABAQUS through the user material subroutine UHYPER. The developed constitutive Model is verified by simulating the covering deformation of the diaphragm over a C-type mold. Finally, as an application of the developed Hyperelastic Model, an optimal design of a support bar in the hot diaphragm preforming process is implemented. The constitutive Model lays a solid foundation for the finite element simulation and process optimization of the hot diaphragm forming (HDF) of carbon composites.

  • a lamination Model for forming simulation of woven fabric reinforced thermoplastic prepregs
    Composite Structures, 2018
    Co-Authors: Youkun Gong, Peng Xu, Xiongqi Peng, Kexin Zhao
    Abstract:

    Abstract In order to characterize the large deformation, anisotropy and multi-field coupling behaviors of woven fabric reinforced thermoplastics (WFRTP) in forming, a lamination Model combining thermoplastic resin and woven fabric reinforcements is established. The WFRTP is Modeled as a laminated structure with impregnated woven fabric layers sandwiched between two thermoplastic resin layers. The thermo-mechanical coupling and viscosity resulted from melted resin matrix is characterized by an isotropic visco-Hyperelastic Model, while the impregnated woven fabric reinforcement is defined by an anisotropic Hyperelastic Model. The proposed lamination Model is demonstrated on forming simulation of a WFRTP over a double-curvature mold. The effects of processing parameters including forming temperature and blank holder force on wrinkling are investigated. The proposed Model is simple and easy for material parameter determination. It provides a theoretical foundation for numerical simulation and processing optimization of WFRTP forming.

  • Draping of plain woven carbon fabrics over a double-curvature mold
    Composites Science and Technology, 2014
    Co-Authors: Hongling Yin, Xiongqi Peng, Zaoyang Guo
    Abstract:

    Abstract This paper investigates the complex fiber reorientation and redistribution of plain woven carbon fabrics draping over a double-curvature mold through experimental and numerical approaches. Firstly, uni-axial tensile, bias-extension and picture-frame tests are carried out to obtain the material properties of the woven carbon fabrics. Material parameters for a previously developed simple anisotropic Hyperelastic Model are accordingly obtained. Secondly, draping experiments are implemented at room temperature using samples with different original fiber orientation. Deformed fabric boundary profiles and local shear angle variations are recorded and analyzed. The draping process is then simulated by using the anisotropic Hyperelastic Model taking into account material and geometric non-linearity. Very good agreement between simulation and experimental results is obtained. The ultimate goal of the investigation is to develop a design tool for the numerical simulation and processing optimization of woven composites forming.

  • A Simple Anisotropic Fiber Reinforced Hyperelastic Constitutive Model for Woven Composite Fabrics
    International Journal of Material Forming, 2010
    Co-Authors: Xiongqi Peng, Zaoyang Guo, Zia-ur-rehman, Philip G. Harrison
    Abstract:

    Based on fiber reinforced continuum mechanics theory, a simple Hyperelastic constitutive Model is developed to characterize the anisotropic nonlinear material behaviour of woven composite fabrics under large deformation during forming. The strain energy function for the Hyperelastic Model is additively decomposed into two parts nominally representing the tensile energy from weft and warp yarn fiber stretches and shearing energy from fiber-fiber interaction between weft and warp yarns, respectively. The proposed material characterization approach is demonstrated on a balanced plain weave composite fabric. The equivalent material parameters in the Hyperelastic constitutive Model are obtained by matching experimental load-displacement data of uni-axial tensile and picture frame tests on the woven composite fabric. The development of this anisotropic fiber reinforced Hyperelastic Model is critical to the numerical simulation and optimization of woven composites forming.

  • A composites-based Hyperelastic constitutive Model for soft tissue with application to the human annulus fibrosus
    Journal of the Mechanics and Physics of Solids, 2006
    Co-Authors: Zaoyang Guo, Xiongqi Peng, Brian Moran
    Abstract:

    Abstract This paper presents a composites-based Hyperelastic constitutive Model for soft tissue. Well organized soft tissue is treated as a composite in which the matrix material is embedded with a single family of aligned fibers. The fiber is Modeled as a generalized neo-Hookean material in which the stiffness depends on fiber stretch. The deformation gradient is decomposed multiplicatively into two parts: a uniaxial deformation along the fiber direction and a subsequent shear deformation. This permits the fiber–matrix interaction caused by inhomogeneous deformation to be estimated by using effective properties from conventional composites theory based on small strain linear elasticity and suitably generalized to the present large deformation case. A transversely isotropic Hyperelastic Model is proposed to describe the mechanical behavior of fiber-reinforced soft tissue. This Model is then applied to the human annulus fibrosus. Because of the layered anatomical structure of the annulus fibrosus, an orthotropic Hyperelastic Model of the annulus fibrosus is developed. Simulations show that the Model reproduces the stress–strain response of the human annulus fibrosus accurately. We also show that the expression for the fiber–matrix shear interaction energy used in a previous phenomenological Model is compatible with that derived in the present paper.

Stephan Gekle - One of the best experts on this subject based on the ideXlab platform.

  • a Hyperelastic Model for simulating cells in flow
    Biomechanics and Modeling in Mechanobiology, 2021
    Co-Authors: Sebastian J Muller, Franziska Weigl, Carina Bezold, Christian Bacher, Krystyna Albrecht, Stephan Gekle
    Abstract:

    In the emerging field of 3D bioprinting, cell damage due to large deformations is considered a main cause for cell death and loss of functionality inside the printed construct. Those deformations, in turn, strongly depend on the mechano-elastic response of the cell to the hydrodynamic stresses experienced during printing. In this work, we present a numerical Model to simulate the deformation of biological cells in arbitrary three-dimensional flows. We consider cells as an elastic continuum according to the Hyperelastic Mooney-Rivlin Model. We then employ force calculations on a tetrahedralized volume mesh. To calibrate our Model, we perform a series of FluidFM[Formula: see text] compression experiments with REF52 cells demonstrating that all three parameters of the Mooney-Rivlin Model are required for a good description of the experimental data at very large deformations up to 80%. In addition, we validate the Model by comparing to previous AFM experiments on bovine endothelial cells and artificial hydrogel particles. To investigate cell deformation in flow, we incorporate our Model into Lattice Boltzmann simulations via an Immersed-Boundary algorithm. In linear shear flows, our Model shows excellent agreement with analytical calculations and previous simulation data.

  • A Hyperelastic Model for simulating cells in flow
    Biomechanics and Modeling in Mechanobiology, 2020
    Co-Authors: Sebastian J Muller, Franziska Weigl, Carina Bezold, Christian Bacher, Krystyna Albrecht, Stephan Gekle
    Abstract:

    In the emerging field of 3D bioprinting, cell damage due to large deformations is considered a main cause for cell death and loss of functionality inside the printed construct. Those deformations, in turn, strongly depend on the mechano-elastic response of the cell to the hydrodynamic stresses experienced during printing. In this work, we present a numerical Model to simulate the deformation of biological cells in arbitrary three-dimensional flows. We consider cells as an elastic continuum according to the Hyperelastic Mooney–Rivlin Model. We then employ force calculations on a tetrahedralized volume mesh. To calibrate our Model, we perform a series of FluidFM $$^{{\textregistered }}$$ ® compression experiments with REF52 cells demonstrating that all three parameters of the Mooney–Rivlin Model are required for a good description of the experimental data at very large deformations up to 80%. In addition, we validate the Model by comparing to previous AFM experiments on bovine endothelial cells and artificial hydrogel particles. To investigate cell deformation in flow, we incorporate our Model into Lattice Boltzmann simulations via an Immersed-Boundary algorithm. In linear shear flows, our Model shows excellent agreement with analytical calculations and previous simulation data.

  • a Hyperelastic Model for simulating cells in flow
    arXiv: Biological Physics, 2020
    Co-Authors: Sebastian J Muller, Franziska Weigl, Carina Bezold, Christian Bacher, Krystyna Albrecht, Stephan Gekle
    Abstract:

    In the emerging field of 3D bioprinting, cell damage due to large deformations is considered a main cause for cell death and loss of functionality inside the printed construct. Those deformations, in turn, strongly depend on the mechano-elastic response of the cell to the hydrodynamic stresses experienced during printing. In this work, we present a numerical Model to simulate the deformation of biological cells in arbitrary three-dimensional flows. We consider cells as an elastic continuum according to the Hyperelastic Mooney-Rivlin Model. We then employ force calculations on a tetrahedralized volume mesh. To validate our Model, we perform a series of FluidFM(R) compression experiments with REF52 cells demonstrating that our Hyperelastic Model provides a very good description of the experimental data even at very large deformations up to 80%. In addition, we validate the Model by comparing to axisymmetric simulations and to previous AFM experiments on bovine endothelial cells and artificial hydrogel particles. To investigate cell deformation in flow, we incorporate our Model into Lattice Boltzmann simulations via an Immersed-Boundary algorithm. In linear shear flows, our Model shows excellent agreement with analytical calculations and previous simulation data.

Kexin Zhao - One of the best experts on this subject based on the ideXlab platform.

  • a lamination Model for forming simulation of woven fabric reinforced thermoplastic prepregs
    Composite Structures, 2018
    Co-Authors: Youkun Gong, Peng Xu, Xiongqi Peng, Kexin Zhao
    Abstract:

    Abstract In order to characterize the large deformation, anisotropy and multi-field coupling behaviors of woven fabric reinforced thermoplastics (WFRTP) in forming, a lamination Model combining thermoplastic resin and woven fabric reinforcements is established. The WFRTP is Modeled as a laminated structure with impregnated woven fabric layers sandwiched between two thermoplastic resin layers. The thermo-mechanical coupling and viscosity resulted from melted resin matrix is characterized by an isotropic visco-Hyperelastic Model, while the impregnated woven fabric reinforcement is defined by an anisotropic Hyperelastic Model. The proposed lamination Model is demonstrated on forming simulation of a WFRTP over a double-curvature mold. The effects of processing parameters including forming temperature and blank holder force on wrinkling are investigated. The proposed Model is simple and easy for material parameter determination. It provides a theoretical foundation for numerical simulation and processing optimization of WFRTP forming.

Zaoyang Guo - One of the best experts on this subject based on the ideXlab platform.

  • Draping of plain woven carbon fabrics over a double-curvature mold
    Composites Science and Technology, 2014
    Co-Authors: Hongling Yin, Xiongqi Peng, Zaoyang Guo
    Abstract:

    Abstract This paper investigates the complex fiber reorientation and redistribution of plain woven carbon fabrics draping over a double-curvature mold through experimental and numerical approaches. Firstly, uni-axial tensile, bias-extension and picture-frame tests are carried out to obtain the material properties of the woven carbon fabrics. Material parameters for a previously developed simple anisotropic Hyperelastic Model are accordingly obtained. Secondly, draping experiments are implemented at room temperature using samples with different original fiber orientation. Deformed fabric boundary profiles and local shear angle variations are recorded and analyzed. The draping process is then simulated by using the anisotropic Hyperelastic Model taking into account material and geometric non-linearity. Very good agreement between simulation and experimental results is obtained. The ultimate goal of the investigation is to develop a design tool for the numerical simulation and processing optimization of woven composites forming.

  • A Simple Anisotropic Fiber Reinforced Hyperelastic Constitutive Model for Woven Composite Fabrics
    International Journal of Material Forming, 2010
    Co-Authors: Xiongqi Peng, Zaoyang Guo, Zia-ur-rehman, Philip G. Harrison
    Abstract:

    Based on fiber reinforced continuum mechanics theory, a simple Hyperelastic constitutive Model is developed to characterize the anisotropic nonlinear material behaviour of woven composite fabrics under large deformation during forming. The strain energy function for the Hyperelastic Model is additively decomposed into two parts nominally representing the tensile energy from weft and warp yarn fiber stretches and shearing energy from fiber-fiber interaction between weft and warp yarns, respectively. The proposed material characterization approach is demonstrated on a balanced plain weave composite fabric. The equivalent material parameters in the Hyperelastic constitutive Model are obtained by matching experimental load-displacement data of uni-axial tensile and picture frame tests on the woven composite fabric. The development of this anisotropic fiber reinforced Hyperelastic Model is critical to the numerical simulation and optimization of woven composites forming.

  • A composites-based Hyperelastic constitutive Model for soft tissue with application to the human annulus fibrosus
    Journal of the Mechanics and Physics of Solids, 2006
    Co-Authors: Zaoyang Guo, Xiongqi Peng, Brian Moran
    Abstract:

    Abstract This paper presents a composites-based Hyperelastic constitutive Model for soft tissue. Well organized soft tissue is treated as a composite in which the matrix material is embedded with a single family of aligned fibers. The fiber is Modeled as a generalized neo-Hookean material in which the stiffness depends on fiber stretch. The deformation gradient is decomposed multiplicatively into two parts: a uniaxial deformation along the fiber direction and a subsequent shear deformation. This permits the fiber–matrix interaction caused by inhomogeneous deformation to be estimated by using effective properties from conventional composites theory based on small strain linear elasticity and suitably generalized to the present large deformation case. A transversely isotropic Hyperelastic Model is proposed to describe the mechanical behavior of fiber-reinforced soft tissue. This Model is then applied to the human annulus fibrosus. Because of the layered anatomical structure of the annulus fibrosus, an orthotropic Hyperelastic Model of the annulus fibrosus is developed. Simulations show that the Model reproduces the stress–strain response of the human annulus fibrosus accurately. We also show that the expression for the fiber–matrix shear interaction energy used in a previous phenomenological Model is compatible with that derived in the present paper.

Sebastian J Muller - One of the best experts on this subject based on the ideXlab platform.

  • a Hyperelastic Model for simulating cells in flow
    Biomechanics and Modeling in Mechanobiology, 2021
    Co-Authors: Sebastian J Muller, Franziska Weigl, Carina Bezold, Christian Bacher, Krystyna Albrecht, Stephan Gekle
    Abstract:

    In the emerging field of 3D bioprinting, cell damage due to large deformations is considered a main cause for cell death and loss of functionality inside the printed construct. Those deformations, in turn, strongly depend on the mechano-elastic response of the cell to the hydrodynamic stresses experienced during printing. In this work, we present a numerical Model to simulate the deformation of biological cells in arbitrary three-dimensional flows. We consider cells as an elastic continuum according to the Hyperelastic Mooney-Rivlin Model. We then employ force calculations on a tetrahedralized volume mesh. To calibrate our Model, we perform a series of FluidFM[Formula: see text] compression experiments with REF52 cells demonstrating that all three parameters of the Mooney-Rivlin Model are required for a good description of the experimental data at very large deformations up to 80%. In addition, we validate the Model by comparing to previous AFM experiments on bovine endothelial cells and artificial hydrogel particles. To investigate cell deformation in flow, we incorporate our Model into Lattice Boltzmann simulations via an Immersed-Boundary algorithm. In linear shear flows, our Model shows excellent agreement with analytical calculations and previous simulation data.

  • A Hyperelastic Model for simulating cells in flow
    Biomechanics and Modeling in Mechanobiology, 2020
    Co-Authors: Sebastian J Muller, Franziska Weigl, Carina Bezold, Christian Bacher, Krystyna Albrecht, Stephan Gekle
    Abstract:

    In the emerging field of 3D bioprinting, cell damage due to large deformations is considered a main cause for cell death and loss of functionality inside the printed construct. Those deformations, in turn, strongly depend on the mechano-elastic response of the cell to the hydrodynamic stresses experienced during printing. In this work, we present a numerical Model to simulate the deformation of biological cells in arbitrary three-dimensional flows. We consider cells as an elastic continuum according to the Hyperelastic Mooney–Rivlin Model. We then employ force calculations on a tetrahedralized volume mesh. To calibrate our Model, we perform a series of FluidFM $$^{{\textregistered }}$$ ® compression experiments with REF52 cells demonstrating that all three parameters of the Mooney–Rivlin Model are required for a good description of the experimental data at very large deformations up to 80%. In addition, we validate the Model by comparing to previous AFM experiments on bovine endothelial cells and artificial hydrogel particles. To investigate cell deformation in flow, we incorporate our Model into Lattice Boltzmann simulations via an Immersed-Boundary algorithm. In linear shear flows, our Model shows excellent agreement with analytical calculations and previous simulation data.

  • a Hyperelastic Model for simulating cells in flow
    arXiv: Biological Physics, 2020
    Co-Authors: Sebastian J Muller, Franziska Weigl, Carina Bezold, Christian Bacher, Krystyna Albrecht, Stephan Gekle
    Abstract:

    In the emerging field of 3D bioprinting, cell damage due to large deformations is considered a main cause for cell death and loss of functionality inside the printed construct. Those deformations, in turn, strongly depend on the mechano-elastic response of the cell to the hydrodynamic stresses experienced during printing. In this work, we present a numerical Model to simulate the deformation of biological cells in arbitrary three-dimensional flows. We consider cells as an elastic continuum according to the Hyperelastic Mooney-Rivlin Model. We then employ force calculations on a tetrahedralized volume mesh. To validate our Model, we perform a series of FluidFM(R) compression experiments with REF52 cells demonstrating that our Hyperelastic Model provides a very good description of the experimental data even at very large deformations up to 80%. In addition, we validate the Model by comparing to axisymmetric simulations and to previous AFM experiments on bovine endothelial cells and artificial hydrogel particles. To investigate cell deformation in flow, we incorporate our Model into Lattice Boltzmann simulations via an Immersed-Boundary algorithm. In linear shear flows, our Model shows excellent agreement with analytical calculations and previous simulation data.