Zhong Yifeng

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Verified

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• PhD
• Dean at Chongqing University

By adjusting the two wall angles of the orthogonal hybrid honeycomb (OHH), the tunable Poisson’s ratio change from negative to positive values and the variation in stiffness can be achieved. To effectively analyze its static and dynamic characteristics, a two-dimensional equivalent Kirchhoff–Love model (2D-EKM) is established based on the variation...

The incorporation of viscoelastic layers in laminates can markedly enhance the damped dynamic characteristics. This study focuses on integrating viscoelastic layers into the composite facesheet of the bowtie-shaped honeycomb core composite sandwich panel (BHC-CSP). The homogenization of the damped BHC-CSP is performed by employing the variational a...

A full triangular chiral (Tri-Chi) honeycomb, combining a honeycomb structure with triangular chiral configuration, notably impacts the Poisson's ratio (PR) and stiffness. To assess the random vibration properties of a composite sandwich panel with a Tri-Chi honeycomb core (CSP-TCH), a two-dimensional equivalent Reissner-Mindlin model (2D-ERM) was...

A full triangular chiral (Tri-Chi) honeycomb, combining a honeycomb structure with triangular chiral configuration, notably impacts the Poisson’s ratio (PR) and stiffness. To assess the random vibration properties of a composite sandwich panel with a Tri-Chi honeycomb core (CSP-TCH), a two-dimensional equivalent Reissner–Mindlin model (2D-ERM) was...

The triangular chiral honeycomb is inspired by the anti-tetra chiral design and consists of fully triangular cells, which is a novel structure that exhibits a negative Poisson’s ratio. In this study, the effective plate properties of sandwich panels with triangular chiral honeycombs (SP-TCH) are evaluated using the variational asymptotic method. Ba...

The dynamic characteristics of sandwich panels with a hierarchical hexagonal honeycomb (SP-HHHs) show significant improvements due to their distinct hierarchy configurations. However, this also increases the complexity of structural analysis. To address this issue, the variational asymptotic method was utilized to homogenize the unit cell of the SP...

The stiffened honeycomb sandwich panel (stiffened HSP) is an improved honeycomb structure by adding the stiffeners into the traditional honeycomb core to enhance the structural performance. The novelty of this work is that the constitutive parameters of the panel are obtained by asymptotical analysis of the strain energy stored in the periodic unit...

The composite sandwich plate with an arrowhead-on core (arrowhead-on CSP) is a new type of composite structure that has the advantages of a low weight, high specific strength, high specific stiffness, and negative Poisson's ratio. In this study, the equivalent plate properties were obtained using the variational asymptotic method (VAM) to asymptoti...

The hybrid honeycomb-like sandwich panel (hybrid HSP) is composed of FRP facesheets and an aluminum/steel honeycomb-like core, which has excellent mechanical properties and lower cost. This paper presents a fast and accurate semi-analytical model for evaluating the mechanical behavior of hybrid HSP based on the variational asymptotic theory and con...

To investigate the mechanical properties of the composite sandwich panel with complex single- and double-layer corrugated lattice-cores (CSP-CLCs), a simplified analytical frame is developed by decoupling the original 3D model into a unit cell-based analytical model (providing equivalent plate properties) and a 2D reduced-order equivalent model (2D...

The issue of facesheet-core debonding is expected to be addressed by increasing the bonding platform of the M-shaped folded core. To investigate its effective performance, the three-dimensional traditional equivalent beam (3D-TEB) model and the one-dimensional equivalent beam model (1D-EBM) of the M-shaped folded sandwich beam were established base...

On the basis of star-shaped core sandwich panel, a novel sandwich panel with petal-triangle core (SP-PSC) was proposed to improve the negative Poisson’s ratio (NPR) effect while retaining the characteristics of light weight and high strength. To study the complex structure more conveniently and quickly, a variational asymptotic method-based equival...

The dynamic behaviors of isogrid-stiffened composite plates (SCPs) exhibit new dynamic characteristics as a result of the introduction of composite materials. To accurately and quickly characterize the forced vibration characteristics of the isogrid SCP, its equivalent plate properties were determined by homogenizing over the unit cell and input to...

Due to their complex microstructures, the research on the static and dynamic behaviors of triangular honeycomb sandwich panels (triangular HSPs) is limited. In this study, the effective plate properties of triangular HSP was obtained by the homogenizing of the unit cell, and then the input to a VAM-based two-dimensional equivalent plate model (2D-E...

The added bonding platform of the M-shaped folded core is expected to address the issue of facesheet-core interface debonding in sandwich plates. A two-dimensional reduced-order plate model based on variational asymptotic method is proposed to investigate the effective performance of the original composite sandwich plate with an M-shaped folded cor...

Due to the high porosity and periodicity of a pyramid lattice core, the dynamic behaviors of a pyramid lattice sandwich plate (PLSP) show new characteristics. In this work, the equivalent stiffness of a PLSP was obtained by homogenizing over the unit cell, and input to an equivalent two-dimensional (2D) reduced-order model constructed from the fram...

The composite sandwich plate with reentrant honeycomb core (CSP-RHC) is a special auxetic composite structure, and the effect of a negative Poisson’s ratio (NPR) on its dynamic characteristics is unclear. In this article, the flexural vibration of CSP-RHC is analyzed based on the 2D homogenized plate model (2D-HPM) using the variational asymptotic...

To overcome the issues of low face sheet-core interface strength and out-of-plane bearing capacity in the traditional pyramid lattice sandwich structure, a composite sandwich plate with enhanced pyramid lattice core (CSP-EPL) is investigated. A two-dimensional reduced-order equivalent model (2D-REM) based on the variational asymptotic approach is d...

The composite sandwich plate with hourglass lattice cores (CSP-HLC) is a novel cellular structure that can increase the width-to-length ratio and reduce the inter-node spacing. However, its static and dynamic behaviors are difficult to analyze due to the complex microstructures. In this work, a computational homogenization method is proposed for ca...

The composite sandwich folded plate (CSFP) not only has excellent mechanical properties but is multi-functional, owing to the internal transparent design. To investigate its effective performance, the original CSFP is reduced to constitutive modeling over the unit cell (providing the orthotropic elastic constants) and global analysis over the two-d...

To solve the microstructure-related complexity of a three-dimensional textile composite, a novel equivalent model was established based on the variational asymptotic method. The constitutive modeling of 3D unit cell within the plate was performed to obtain the equivalent stiffness, which can be inputted into the 2D equivalent model (2D-EPM) to perf...

In this article, to remove the periodicity requirement in the thickness direction of plain-woven composite plates with finite thickness, a novel equivalent plate model (2D-EPM) based on the variational asymptotic method was established to study the static and dynamic behavior of plain-woven composite plates under different boundary and load conditi...

To comprehensively study the static and dynamic behaviors of fiber-reinforced polymer (FRP) laminates with triangle convexities (FLTC) under different boundary conditions and avoid structural damage, an equivalent model of the FLTC was developed based on the variational asymptotic method. A constitutive model of the unit cell was developed to obtai...

The geometry of the composite sandwich plate with bi-directional trapezoidal cores (BTCs) is characterised by its novel cores with trapezoidal convex and concave corrugations in two in-plane directions. To solve the related difficulties in mechanical problems, a reduced plate model is established and written as a variational formulation based on th...

The orthogrid-stiffened FRP panel (OSFP) is a generic structural element in weight-sensitive structure applications. Based on the variational asymptotic method, a 2D reduced-order plate model (2D-RPM) of OSFP was constructed through matching the strain energy of the original panel for static and dynamic analyses. The local field distributions were...

In this article, an equivalent model (called the two-dimensional equivalent plate model (2D-EPM)) of a composite honeycomb sandwich plate (CHSP) is developed using the variational asymptotic method (VAM). The three-dimensional (3D) geometric nonlinear problem of the CHSP is decoupled into a linear constitutive model over a unit cell and a geometric...

The isogrid stiffened composite plate (ISCP) can be used to resist bending and buckling loads while being lightweight. In order to reveal the relationship between structural parameters and static/dynamic behavior, the original geometrical nonlinear problem of ISCP is decoupled into a linear constitutive modeling over the unit cell and a geometrical...

In order to deeply study the static and dynamic behavior of hemispherical convex-concave composite plate (HCCP) under different conditions and avoid structural damage, the equivalent model of HCCP was developed based on variational asymptotic method. The constitutive modeling of unit cell was carried out to obtain the constitutive relations that ca...

Compared with the ordinary foundation plate, the composite conical convex-concave plate (CCCP) has obvious anisotropic characteristics, and there is less research on the relationship between its mechanical properties and structural parameters. In this article, a numerical model for the equivalent stiffness of a typical unit cell with conical convex...

In present work, the variational asymptotic method is extended to study the bucking of composite honeycomb sandwich plate with negative Poisson’s ratio (CHSP-NPR), which is easily buckle under compressive loads or bending moments and may lead to catastrophic failure. For global bucking with small local rotations, the 3D geometrical nonlinemr proble...

Accurate and effective prediction of the static and dynamic behavior of thin-walled orthotropic composite plates (TW-OCP) is necessary in the preliminary design. Considering that the thickness of each segment of TW-OCP is relatively thin, the constitutive modeling of unit cell is carried out to obtain the constitutive relations by using variational...

Accurate and effective prediction of the thermoelastic behavior of composite wind blades is critical to the optimal design and performance evaluation. In this paper, a high-fidelity dimensional reduction model of composite wind blade is established based on the variational asymptotic multiscale method. First, the thermoelastic variational expressio...

According to the anisotropy and non-homogeneity of composite sandwich panels with negative Poisson's ratio (NPR), the variational asymptotic method combined with multiscale technology (VAMM) is used to analyze its effective properties. Firstly, in the microscale, the effective properties of the unidirectional fiber reinforced composite (UDFRC) form...

As a lightweight building material, hollow-glass-beads-filled cement-based composites (HGB-CBCs) have important applications in building energy saving and fireproofing. In order to reveal the mechanism of thermal conduction in HGB-CBCs, a heat conduction micro-model of HGB-CBCs was established based on the variational asymptotic homogenization meth...

In order to accurately predict the static and dynamic behavior of composite box beam, the Geometrically Exact Nonlinear Model (GENM) of composite box beams with arbitrary material distribution and large deflection was performed based on the Hodges’ neralized Timoshenko beam theory. The strain of any point in the deformed beam was calculated by the...

A micromechanics model was developed to characterize the effective creep response and macroscopic stress-strain behavior of linear viscoelastic polymer matrix composites based on variational asymptotic homogenization theory framework. Stated from the energy functional variational expression derived from the constitutive equations of the linear visc...

A micromechanical model was developed for predicting effective hygrothermoelastic properties of composites and local field distributions within the unit cell based on the framework of the variational asymptotic homogenization theory. Starting from the derivation of the hygrothermoelastic free energy functional of composites, the leading variable it...

In previous work, a 2D plate model for composite laminates without invoking ad hoc kinematic assumptions is constructed by modifying the asymptotically correct energy functional up to the desired order. However, it is not possible in general to construct an asymptotically correct Reissner-Mindlin model for practical use. To obtain the energy functi...

The effective properties as well as local fields of heterogenous magneto-electro-elastic (MEE) materials with coated fibers are investigated by using the variational asymptotic homogenization method. Starting from the total electromagnetic enthalpy of the heterogenous continuum, the multiphysics micromechanics model is formulated as a constrained m...

An analytical investigation is performed to study the secondary instability and dynamic aspects of the mode jumping in hygrothermally buckled angle-ply laminated plates. The governing partial differential equations (PDEs) and constitution relations are derived rigorously from an asymptotically correct, geometrically nonlinear theory. A novel and re...

An analytical investigation is performed to study the secondary instability and dynamic aspects of the mode jumping in hygrothermally buckled cross-ply laminated plates. The governing partial differential equations (PDEs) and constitution relations are derived rigorously from an asymptotically correct, geometrically nonlinear theory. A novel and re...

A new micromechanics model is developed to predict the effective properties as well as the local fields of heterogeneous magnetostrictive composite materials using the variational asymptotic method for unit cell homogenization (VAMUCH), a recently developed micromechanics modeling technique. Starting from the total magnetic enthalpy of the heteroge...

A magneto-electro-elastic Reissner–Mindlin model is developed for heterogeneous multilayer laminates made of functionally graded magneto-electro-elastic material using the variational asymptotical method. This model is applicable to laminates without prescribed electric and magnetic potential though the thickness. Taking advantage of the smallness...

The variational asymptotic method is used to construct a fully coupled Reissner–Mindlin model for piezoelectric and piezomagnetic laminates with some surfaces parallel to the reference surface coated with electrodes and magnetism. Taking advantage of the smallness of the plate thickness, we asymptotically split the original 3D electromagneto-mechan...

In order to effectively analyze the mechanical behavior of inhomogeneous functionally graded plates, a high-fidelity simplified model is developed based on variational asymptotic method (VAM). The 3D energy equation of functionally graded plate is established based on the expanded Hamilton principle. The 3D energy equation is asymptotically expande...

Based on the Variational Asymptotic Method (VAM), a simplified thermopiezoelastic model for piezoelectric composite laminates under mechanical, thermal and electronic loads is presented in order to effectively formulate the originally one-way coupled thermopiezoelasticity problem. The total potential functional is deduced based on the principle of...

An efficient shell model is developed for analyzing one-way coupled thermomechanical behavior of composite cylindrical shells by using the variational asymptotic method (VAM). Taking advantage of the smallness parameter inherent in the shell structure, the VAM is applied to rigorously decouple the 3-D, thermoelasticity problem into a 1-D through-th...

An efficient high-fidelity shell model is developed for heterogeneous multilayer cylindrical shells made of functionally graded material by using the variational asymptotic method (VAM). Taking advantage of the smallness parameters inherent in the shell structure, the VAM is applied to rigorously decouple the 3-D, anisotropic elasticity problem int...

The governing partial differential equations (PDEs) were deduced from the asymptotically correct geometrically nonlinear theory to research the buckling and mode jumping behavior of clamped supported composite laminates with antisymmetric angle-ply under bi-axial compressive load. The two coupled fourth-order partial differential equations (PDEs),...

A hygrothermal model for analyzing composite laminates under both mechanical and hygrothermal loadings is constructed by the variational asymptotic method (VAM). The original 3-D nonlinear, one-way coupled, hygrothermoelasticity problem is formulated based on a set of intrinsic variables defined on the reference plane and for arbitrary deformation...

In order to effectively analyze the thermal post-buckling performance of antisymmetric angle-ply composite laminates, the two coupled fourth-order governing partial differential equations, namely, the compatibility equation and dynamic governing equation, were deduced according to the asymptotically correct, geometrically nonlinear theory. A relati...

This paper develops a simplified model for composite laminated plates by the variational asymptotic method (VAM) in order to efficiently analyze the nonlinear, one-way couples problem. It deduced the 3D energy expressions based on the decomposition of rotation tensor (DRT). The 3D laminated plate model is decomposed into a 2D plate analysis and a n...

To effectively simulate and accurately recover the three-dimensional stress/strain/deformation field of composite laminated plates, an asymptotic revise theory and the recovery relationship were established based on the variational asymptotic method (VAM). The original 3D stress field was expressed by one-dimensional generalized stress and warping...