Zengtao Chen

Zengtao Chen
University of Alberta | UAlberta · Department of Mechanical Engineering

PhD, Professor, Fellow of ASME and CSME

About

304
Publications
40,809
Reads
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3,540
Citations
Citations since 2016
141 Research Items
2218 Citations
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
Additional affiliations
August 2014 - present
University of Alberta
Position
  • Professor
August 2004 - July 2014
University of New Brunswick
Position
  • Research Assistant
Description
  • Assistant Professor 2004-2007 Associate Professor 2007-2011 Professor 2011-2014 Director of Graduate Studies 2010-2012 Department Chair 2012-2014
August 1999 - July 2004
University of Waterloo
Position
  • PhD Candidate/Visiting Scholar
Description
  • August 1999-April 2000, May-July 2004, Visiting Scholar
Education
May 2000 - April 2004
University of Waterloo
Field of study
  • Mechanical Engineering
September 1987 - October 1995
Harbin Institute of Technology
Field of study
  • Solid Mechanics
September 1983 - July 1987
Nanjing University of Science and Technology
Field of study
  • Mechanical Engineering

Publications

Publications (304)
Conference Paper
Full-text available
A random elasto-plastic lattice network model is developed to simulate the damage behavior of fibrous materials. Elasto-plastic bar elements are used to construct a regular lattice network with the random element strength distributions to simulate the randomness of the continuum fibrous materials. The structural response of the elasto-plastic latti...
Article
In this paper, the effect of a novel surface treatment method that combing the discrete laser surface hardening (DLSH) and ultrasonic surface rolling (USR) on the material properties (surface roughness, microstructures, microhardness and residual stress) and rolling contact fatigue (RCF) behaviors of 25CrNi2MoV steel were investigated. A continuous...
Article
Full-text available
Panelized fabrication of light-frame wood buildings has higher productivity than the traditional stick-built method. However, the roof production process is not very efficient due to the structural system and construction method. This study proposes a novel apex connection that allows for a folding mechanism in a panelized light wood frame roof sys...
Article
Recent researches show that biomaterials have opened a way to inspire new microstructural designs in pursuit of ideal mechanical properties. Originated from nacre, a brick-and-mortar graded (BM-GRAD) hierarchical arrangement is proposed. To reveal the underlying cracking mechanism, multiphysical fields are investigated theoretically, including ther...
Article
For mixed-mode, thermal shock crack problems with thermal lagging behaviors, it is difficult to obtain the transient thermal stress intensity factors (TSIFs). This paper aims to develop a method combining the Newmark method and the transient interaction energy integral method (IEIM) to extract the transient, mixed-mode TSIFs of nonhomogeneous, laye...
Article
Full-text available
Laser powder bed fusion (LPBF) is widely accepted for manufacturing metallic parts with complex internal structures. However, LPBF has inherent limitations such as lack of fusion and residual stresses leading to porosity and shape deviations. There is not enough experimental data available in terms of porosity or shape deviation analysis for differ...
Article
The current investigation aims to account for the influence of porosity modeling while studying the dynamic response of functionally graded material (FGM) plates within the framework of a new, higher-order shear deformation theory for the first time. In the newly developed porosity modeling, the reciprocal effect of mass density and Young’s modulus...
Article
Full-text available
An interface crack between dissimilar elastic thin-films with surface effect has been investigated. By using integral transform technique the mixed boundary value problem of an interface crack is reduced to singular integral equations, which can be further reduced to a Riemann–Hilbert problem with analytical solution. The crack-tip singularities of...
Article
To solve the thermal fracture problem of non-homogeneous coating structure (NCS) with dual interfaces under strong transient thermal loading, this paper proposes a method to extract fracture parameters by combining the Newmark method and the transient interaction energy integral method (IEIM). The strong transient temperature and the transient ther...
Article
A mode-I crack in a one-dimensional (1D) orthorhombic quasicrystal (QC) strip under in-plane phonon and phason stress loading is considered. Fourier transforms are applied to reduce the mixed boundary value problem of the mode-I crack to solving a system of simultaneous singular integral equations. Asymptotic expressions of the phonon and phason st...
Article
Owing to the geometric errors, preload of ball screws usually exhibits a two-stage degrading characteristic during operation, which is taken as the running-in stage (the first stage) and steady wear stage (the second stage), respectively. While existing researches were mainly focused on the steady wear stage, no references can be found in modelling...
Article
In this paper, a special method for solving transient thermal stress intensity factors (TSIFs) in functionally graded materials (FGMs) with inclined cracks under strong, transient thermal shock loading is established based on the hyperbolic heat conduction equation. First, the Newmark method is employed to obtain the strong transient temperature fi...
Article
Modeling of friction forces for linear motion ball guides considering variation of the friction parameter with operating condition, Tribology Transactions, Abstract: Friction directly influences thermal deformation and transmission efficiency in a linear motion ball guide (LMBG). In existing friction force models for LMBGs, the friction parameter i...
Article
The anisotropy and nonuniformity of wood-plastic composites (WPCs) affect the milling tool, which rapidly wears during high-speed milling of WPCs. Thus, the evolution mechanism of tool failure becomes complicated, and the prediction of tool wear cannot be precisely described mathematically. A neural network based on tool wear test was proposed to p...
Article
Preload, which is widely applied in linear motion ball guide (LMBG) to eliminate clearance and increase stiffness, gradually decreases owing to wear, resulting in the degradation of the load-bearing capability and dynamic response of LMBG. However, no solution can be found on the modeling of the preload degradation of LMBG considering raceway profi...
Article
In this paper, a central crack in a one-dimensional (1D) orthorhombic quasicrystal strip under anti-plane loadings has been studied. Fourier transform is applied to reduce the mixed boundary value problem of the crack to solving a system of simultaneous singular integral equations. Asymptotic expressions of the phonon and the phason fields near the...
Article
Preload, which is widely applied in linear motion ball guide (LMBG) to eliminate clearance and increase stiffness, gradually decreases owing to wear, resulting in the degradation of the load-bearing capability and dynamic response of LMBG. However, no solution can be found on the modelling of the preload degradation of LMBG considering raceway prof...
Article
Full-text available
The size dependence of central nanovoid embedded in either monocrystalline or polycrystalline high-entropy-alloy (HEA) films under biaxial tension is investigated in this study. Regarding monocrystalline samples, our attention is paid to the proportional increase in the embedded nanovoid with invariant void volume fraction (VVF). The critical stres...
Article
Serving as thermal barrier coatings in the harsh environment, functionally graded materials are usually subject to the extremely high temperature gradient, under which circumstance the classical Fourier's law breaks down and the non-Fourier effect becomes pronounced. The configuration of an orthotropic functionally graded coating bonded to the homo...
Article
This study is concerned with the dynamic behavior of a piezoelectric material strip with a parallel crack under thermal shock and transient electric loading. The governing thermal and electromechanical equations are exactly reduced to a system of Cauchy-type singular integral equations by applying Laplace and Fourier transforms and the dislocation...
Article
The influence of both preload and the presence of shim types on the mechanical properties of composite-aluminium single-bolt, single-lap joints were studied in this paper. The load-displacement curve and surface strain field of joints in different shim types and preloads were obtained through tensile experiments. A progressive damage model was esta...
Article
This novel study presents a framework to investigate the effects of transient heat conduction on the nonlinear deflection and vibration of single-walled carbon nanotubes (SWCNTs) based on Eringen’s nonlocal elasticity and nonlocal heat conduction theories. The first phase of this research involves modifying the hyperbolic heat conduction theory by...
Article
Storage tanks are usually used for the storage of various inflammable and explosive media. When the concentration of inflammable gases volatilized from the media in the tank lies in the range between the lower and upper explosive limits, combustion and explosion are very likely to happen under the condition of accidental ignition. The storage tank...
Article
This paper provides a hybrid method for net shape, lattice based, complex bimetallic composites using a combination of laser powder bed additive manufacturing and vacuum-assisted melt infiltration casting process. 316L stainless steel lattice structures were built using a selective laser melting (SLM) technique. Then, their cavities were filled wit...
Article
A fully coupled electrochemical-mechanical theoretical model for all-solid-state Li-ion batteries (ASSLBs) is established considering the effects of contact areas and compressive pressure. The influences of contact area loss and compressive pressure on the electrical and mechanical properties of the ASSLB are numerically studied in the charging pro...
Article
Full-text available
This study reports fabrication, mechanical characterization, and finite element modeling of a novel lattice structure based bimetallic composite comprising 316L stainless steel and a functional dissolvable aluminum alloy. A net-shaped 316L stainless steel lattice structure composed of diamond unit cells was fabricated by selective laser melting (SL...
Article
In this paper, the interaction of collinear interface cracks between dissimilar one-dimensional (1D) hexagonal quasicrystals with piezoelectric effect under anti-plane shear and in-plane electric loading has been studied. By using complex variable method the mixed boundary value problem for the interface cracks was reduced to the solution of Rieman...
Article
In this work, the fracture problem of an orthotropic functionally graded strip containing an internal crack parallel to its surfaces subjected to thermal shocks is examined. To eliminate the paradox of infinite heat propagation speed and take the microstructural interactions of thermal energy carriers into account, the non-Fourier, dual-phase-lag t...
Article
Full-text available
The degradation of the preload gradually deteriorates the dynamic behavior of linear rolling guide (LRG) as well as the machine tool it drives. However, very few researches can be found on the preload degradation of LRG. In the present work, a preload degradation model for LRG is proposed, in which two effectiveness coefficients are introduced acco...
Article
Full-text available
The in-plane thermoelastic response of curved beams made of porous materials with different types of functionally graded (FG) porosity is studied in this research contribution. Nonlinear governing equations are derived based on the first-order shear deformation theory along with the nonlinear Green strains. The nonlinear governing equations are sol...
Article
This paper explores how reinforcing the hyperbolic heat conduction by the nonlocality affects temperature distribution in nanostructures such as nanobeam and single‐walled carbon nanotubes (SWCNTs). The work dissects the nonlocal heat conduction by advocating a thoroughly new application of the differential quadrature method. The nanobeam is modele...
Article
Full-text available
Composite-aluminum structures exist in aircraft structures generally. It is easy to cause gap between mating surfaces in composite-aluminum assembled structures with the curing deformation of composite. The composite-aluminum, single-lap, single-bolt joints were utilized to investigate the influence of forced assembly, liquid shim and peelable fibe...
Article
Aiming at some shortcomings of the existing non-contact two-dimensional high-precision measurement methods, this paper proposes a two-dimensional high-precision non-contact automatic measurement method based on the corner coordinates of the image. Firstly, this paper designs a set of simple image acquisition device and explains the advantages of th...
Article
In this paper, the thermoelastic response of an interface crack between a functionally graded coating and a homogeneous substrate under thermal loading is investigated using the nonlocal continuum theory to eliminate the stress singularities at the crack tips and address the size effects. The differential form of nonlocal theory is utilized to obta...
Article
In this paper, the thermoelastic response of an interface crack between a functionally graded coating and a homogeneous substrate under thermal loading is investigated using the nonlocal continuum theory to eliminate the stress singularities at the crack tips and address the size effects. The differential form of nonlocal theory is utilized to obta...
Article
Fiber-reinforced polymer composites have gained tremendous popularities in various engineering applications due to their superior mechanical performances. This work is devoted to investigating the transient thermomechanical responses of an orthotropic fiber-reinforced strip containing a crack aligned along the fiber direction. The non-Fourier, dual...
Article
We present a framework to investigate the effects of transient heat conduction on heatwave interference and the overshooting phenomenon in carbon nanotube (CNT)-reinforced composites. Material properties of the nanocomposite are temperature and volume dependent. Different kinds of heat conduction models such as Fourier, hyperbolic or single-phase-l...
Article
Full-text available
This paper proposes a non-intrusive interval uncertainty analysis method for estimation of the dynamic response bounds of nonlinear systems with uncertain-but-bounded parameters using polynomial chaos expansion. The conventional interval arithmetic and Taylor series methods usually lead to large overestimation because of the intrinsic wrapping effe...
Article
A hybrid analytical heat conduction model was developed to predict the transient thermal evolution at the particle–substrate interface during the deposition of cold spray process. First, three-dimensional heat conduction model based on classical diffusion approach was developed to predict the transient surface temperature of the substrate. To that...
Article
In this paper, the extension of the nonlocal dual-phase-lag (DPL) theory is formulated to account for the heat conduction at nanoscale. Both the temporally and spatially nonlocal effects are considered in heat conduction, which are verified experimentally by the size-dependent thermal conductivity of silicon nanofilms and the transient temperature...
Article
In this paper, the nonlocal theory is utilized to deal with a Griffith crack problem under thermal-mechanical loading for the first time to eliminate stress singularity at the crack tip. A partially, thermally insulated Griffith crack subjected to a remote heat flux and mechanical loading is investigated. Fourier transform is employed to convert th...
Article
Full-text available
Concrete is a highly complex and heterogeneous three-phase composite composed of aggregates, matrix and the interfacial transition zone (ITZ) between them. As the weakest structure of concrete, the ITZ is often ignored due to difficulty in its modelling using the finite-element method. In this paper, concrete models with high-volume fractions of ag...
Article
An interval uncertain optimization method is proposed for engineering uncertain optimization problems. The first-order derivative information may be unavailable in practical engineering systems. To overcome this drawback, the method to calculate the first-order partial derivatives with a back-propagation neural network is investigated, and a numeri...
Article
This paper proposes a new interval uncertainty analysis method for structural response bounds with uncertain‑but-bounded parameters by using feedforward neural network (FNN) differentiation. The information of partial derivative may be unavailable analytically for some complicated engineering problems. To overcome this drawback, the FNNs of real st...
Article
Full-text available
Studied in this paper is the surface tension-induced stress field around two nanoscale holes in an infinite, elastic matrix. The complex variable method is adopted to describe the assumed plane-strain deformation of the structure. The stress boundary conditions at the surfaces of the holes are formulated via the integral-type Gurtin–Murdoch model....
Article
Comprehensive molecular dynamics (MD) simulations are performed to study the stress response and deformation mechanism in void-embedded, single-crystal and nanocrystalline, high-entropy-alloy (HEA) films under uniaxial tensile loading. Our results reveal that certain void-embedded HEA films can be, by far, superior to pure Ni in terms of tensile du...
Article
Full-text available
This paper aims at a fundamental perspective of multiple cracks’ interaction on the fracture behavior of magnetoelastic materials. A theoretical study is performed on a soft ferromagnetic solid weakened by an array of periodic cracks under an in-plane magnetic loading. By using the conformal mapping technique and the analytic function boundary valu...
Article
We proposed a thermo-mechanical coupled model to better understand the coupling effects of thermo-oxidative aging and braiding structure on the high-speed impact responses of 3D braided carbon fiber reinforced epoxy composite. The impact responses of the aged and unaged braided composites with different braiding structures were experimentally and n...
Article
Full-text available
The first application of the differential quadrature method (DQM) in solving the nonlinear dual-phase-lag (DPL) heat conduction equation is demonstrated here. To show the effect of DPL parameters, the temperature response of the medium was obtained from Fourier’s low, hyperbolic heat conduction and hyperbolic type DPL heat conduction model were com...
Article
In the past decade, viscoelastic materials (like polymer composites, biological tissues, rubber, etc.) have been increasingly used in a variety of industries due to their excellent multifunctional properties. In this work, by extending the fractional calculus to dual-phase-lag (DPL) heat conduction theory, the transient thermal–mechanical response...
Article
Novel stainless steel/zinc alloy composites are produced by infiltrating ZA8 zinc alloy into rolled 304 stainless steel wire mesh preforms via squeeze casting. Microstructural characteristics of the composite are observed and the uniaxial tensile properties at different temperatures are investigated. The tensile properties of the composites of sint...
Article
Novel interpenetrating phase composites (IPCs) were produced by infiltrating ZA8 alloy into sintered 304 stainless steel fiber preforms through squeeze casting. Microstructural characteristics and dry sliding wear behavior of the IPCs at room and elevated temperatures under different applied loads were investigated. The results indicate that the mi...
Article
Full-text available
An expansion joint is mainly composed of bellows and other components; it is attached on a container shell or pipe to compensate for the additional stress caused by temperature differences and mechanical vibrations. In China, the expansion joint fatigue tests are often used to assess the quality of products. After fatigue tests, convolution pitch w...
Article
Full-text available
The present work investigates the problem of a cylindrical crack in a functionally graded cylinder under thermal impact by using the non-Fourier heat conduction model. The theoretical derivation is performed by methods of Fourier integral transform, Laplace transform, and Cauchy singular integral equation. The concept of heat flux intensity factor...
Chapter
In this chapter, the non-Fourier heat conduction models such as the hyperbolic heat conduction, dual phase lag heat conduction, and the memory-dependent fractional heat conduction models are used to deal with crack problems in advanced composite materials. A few typical examples, such as cracks in a half-plane with a thin film coating, partially-in...
Chapter
In this chapter, the non-Fourier heat conduction equations along with the boundary and initial conditions are solved for one-dimensional (1D) media with semi-infinite or finite dimensions in Cartesian, cylindrical, and spherical coordinates.
Chapter
Non-Fourier heat conduction theories have seen wide range of applications in both theoretical and applied science in recent years.
Chapter
The design of high performance micro/macro-scale composite structures working at high temperature and humidity environmental conditions needs an accurate heat and moisture transfer analysis through the solid structure.
Chapter
Besides being the snack of choice of the Chinese Giant panda, the bamboo plant also represents a near-perfect natural example of a functionally graded material.
Chapter
In this chapter, the definition of smart materials are presented. The concept of multiphysics is introduced and different types of coupled multiphysical fields are elucidated. Moreover, the piezoelectric and piezomagnetic materials as the two common components of smart materials and structures are introduced. Finally, some potential applications of...
Chapter
In this chapter, we introduce a so-called extended displacement discontinuity approach to deal with three-dimensional (3D) thermoelastic plane crack problems in advanced materials.
Article
Full-text available
The presence of inclusions in metal-based composites subjected to an electric current or a heat flux induces thermal stresses. Inclusion geometry is one of the important parameters in the stress distribution. In this study, the plane problem of an arbitrarily-shaped inclusion embedded in an infinite conductive medium is investigated based on the co...
Book
This is the first single volume monograph that systematically summarizes the recent progress in using non-Fourier heat conduction theories to deal with the multiphysical behaviour of smart materials and structures. The book contains six chapters and starts with a brief introduction to Fourier and non-Fourier heat conduction theories. Non-Fourier h...
Article
Full-text available
In the present article, a thermo-viscoelastic model is developed to investigate fractional single-phase lag heat conduction and the associated transient thermal mechanical behavior of a cracked viscoelastic material under a thermal shock. To avoid the negative temperature distribution around cracks, which violates the second law of thermodynamics,...
Article
Taking the 3000-m³ vertical vault storage tank as the research object, the finite element calculation method is used to calculate the pressure and temperature of the fluid during the explosion of the tank. By calculating the structural response of storage tank using multi-field coupling method, the distribution of stress and the deformation of tank...