Browsing by Author Nguyen, Dinh Duc

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  • 83.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc; Nghiem, Thi Thu Ha (2011)

  • Composite material with polymer matrix - titanium particle is widely applied in Vietnam, today. In this paper, the bending of thin polymer composite plate with Titaniump articles under the effect of the steady temperature field is investigated. The paper has established the boundary problem of a simply supported composite plate reinforced by particles under the influence of steady heat transfer process. Using the Navier’s method to solve the problem, an analytic solution of the bending plate given in tiie form of double trigonometric series is obtained. Base on the analytic result, a numerical test is done to find suitable material and clarily the influence of the particles.

  • 108.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc; Nguyen, Thi Thuy (2010)

  • With advantages such as high strength, high stiffness, high chemical resistance, light weight...composite tubes are widely applied in urban construction and petroleum industry. In this report, the authors used the displacement method to study the mechanical behavior (shess, strain...) of an infinite hollow cylinder made of composite material under unsteady, axisymmetric plane temperature field. In the numerical calculations, we mainly studied the influence of time and volume ratio of the particle on the displacement and thermoelastic stress of a cylinder made of Titanium /PVC composite.

  • 129.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc; Hoang, Van Tung (2006)

  • Composite material is widely used in modern structures and the life thank to its advantages. In fact, one has investigated and applied many kinds of three-phase composite material obtained by embedding spherical inclusions into the matrix phase of fibre reinforced material. Seeking solutions for the effective properties of three- phase composite including matrix phase and two other phases, which are spherical particles, has been given in [2]. Basing on algorithm introduced in [2], we have deriven three-phase problem into two two-phase problems and determined the uniaxial mod­ ulus of three-phase composite composed of matrix phase, aligned fibres and spherical inclusions. ...

  • 120.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc; Nguyen, Tien Dac (2006)

  • The composite material reinforced by aligned fibre is an important type of material because of its practical applications in many components of structures. This material is a tranversely isotropic medium having five independent elastic constants. Many researchers are involved in determining these elastic constants. By using com­ plex function method for solving the plane strain problem in elasticity theory, [4] has given a relatively precise method for determining the stiffnesses of transversely isotropic medium. [5] has introduced a method for defining the engineering constants of the composite material reinforced by fibre basing on physical experiments. In this paper, ...

  • 121.pdf.jpg
  • Article


  • Authors: Luu, Manh Ha; Tran, Duc Tan; Nguyen, Thanh Long; Nguyen, Dinh Duc; Nguyen, Phu Thuy (2006)

  • The demand of navigation and guidance has been urgent for many years. In fact, INS is daily used in controlling flight dynamics. Nowadays, with the strong growth of Micro-Electro-Mechanical-System (MEMS) technology, the Inertial Navigation Systems (INS) is applied widely. However, there are existing errors in the accelerometer and gyroscope signals that cause unacceptable drifts. There are two kinds of noise in the INS: deterministic and stochastic errors. The deterministic noises are usually eliminated by the carefully calibration process but the stochastic noises are always difficult to treat. In this paper, we have determined successfully the characteristics of the ME...

  • 101.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc; Dinh, Khac Minh (2010)

  • Composite is a material composed of two or more component material to obtain better properties. 3-phase composite is usually added wwith reinforced fibers and particles. This report presents an experimental study on the bending of some 3-phase composite plates for Vietnam's shipbuilding industry. The studied composite is made of polyester matrix, glass fiber and titanium dioxide particle (TiO2). The numerial study, in which the interaction between the matrix and particle is taken into account, shows good agreement with the experiment.

  • High-frequency-modes-meshfree-analysis-of-Reissner-Mindlin-plates_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Bui, Tinh Quoc; Doan, Duc Hong; Do, Thom Van; Sohichi Hirose; Nguyen, Dinh Duc (2016)

  • Finite element method (FEM) is well used for modeling plate structures. Meshfree methods, on the other hand, applied to the analysis of plate structures lag a little behind, but their great advantages and potential benefits of no meshing prompt continued studies into practical developments and applications. In this work, we present new numerical results of high frequency modes for plates using a meshfree shearlocking-free method. The present formulation is based on Reissner-Mindlin plate theory and the recently developed moving Kriging interpolation (MK). High frequencies of plates are numerically explored through numerical examples for both thick and thin plates with different bounda...

  • 235.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc (2003)

  • The remarkable advantage of composite material is light, durative in physical-chemical envirionment specially in high temperature. Because of its advantages, composite material is being used in various field such as inductry, transport, machine-manufacturing, medicine etc, and specially in manufacturing flying vehicle.

  • 227.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc (2003)

  • Nano material has just been exploited and employed recently. However, its extraodinary and marvelous characteristic opend a new and significal prospect in new material field. There have been numerous mechanical problems that should be taken into consider and being solved. In this article, we want to introduce the concept of nanocrystal, our new results in researching on the material, and problems posing on this industry.

  • 36.pdf.jpg
  • Article


  • Authors: Pham, Hong Cong; Nguyen, Dinh Duc; Dao, Huy Bich (2015)

  • This paper deals with an analysis on the supersonic flutter characteristics of Functionally Graded (FGM) plate under aerodynamic loads. Based upon the classical plate theory and the Ilyushin supersonic aerodynamic theory, the governing equations of FGM plates lying in the moving supersonic airflow are derived. The application of Galerkin method with an approximate two-terms Fourier expansion solution leads to a set of nonlinear auto-oscillation equations for determining the nonlinear flutter response and critical velocity. Numerical results are obtained by fourth-order Runge-Kutta method. The influences of the material properties, geometrical parameters and initial conditions on the s...

  • 26.pdf.jpg
  • Article


  • Authors: Tran, Quoc Quan; Dao, Huy Bich; Nguyen, Dinh Duc (2015)

  • Based on classical shell theory with the geometrical nonlinearity in von Karman-Donell sense and the Ilyushin nonlinear supersonic aerodynamic theory, this paper successfully formulated the equations of motion of the functionally graded cylindrical panel on elastic foundations under impact of a moving supersonic airflow and found the critical velocity of supersonic airflow that make the panel unstable. This paper also used the Bubnov-Galerkin and Runge – Kutta methods to solve the system of nonlinear vibration differential equations and illustrated effects of initial dynamical conditions, shape and geometrical parameters, material constituents and elastic foundations on aerodynamic re...

  • 77.pdf.jpg
  • Article


  • Authors: Vu, Thi Thuy Anh; Nguyen, Dinh Duc (2013)

  • To increase the thermal resistance of various structural components in high-temperature environments, research reports focusing nonlinear axisymmetric response of thin FGM shallow spherical shells with ceramic – metal – ceramic layers (S-FGM) under uniform external pressure and temperature. Equilibrium and compatibility equations for shallow spherical shells are derived by using the classical shell theory and specialized for axisymmetric deformation with both geometrical nonlinearity and initial geometrical imperfection. One-term deflection mode is assumed and explicit expressions of buckling loads and load–deflection curves are determined due to Galerkin method. Stability analysis fo...

  • 20.pdf.jpg
  • Article


  • Authors: Pham, Van Thu; Nguyen, Dinh Duc (2016)

  • In this paper, the problem of nonlinear stability response of imperfect three-phase sandwich laminated polymer nanocomposite panels resting on elastic foundations in thermal environments is investigated using an analytical approach. Governing equations are derived based on classical shell theory, incorporating von Karman–Donnell type nonlinearity, initial geometrical imperfection, and Pasternak type elastic foundations. By applying the Galerkin method, an explicit expression to find the critical load and post-buckling load-deflection curves are obtained. The effects of fibres and nano-particles, material and geometrical properties, foundation stiffness, imperfection, and temperature o...

  • Cover.jpg.jpg
  • Book


  • Authors: Nguyen, Dinh Duc (2014)

  • Nghiên cứu phi tuyến ổn định tĩnh và động, các đáp ứng phi tuyến tĩnh và động của các kết cấu tấm, vỏ vạt liệu composite chức năng FGM, bao gồm các kết cấu tấm, vỏ 2 độ cong, vọ trụ tròn, vỏ cầu FGM. Vật liệu chức năng (FGM) là vật liệu composite thế hệ mới, bao gồm chủ yếu 2 thành phần gốm và kim loại, có sự phân bố thành phần vật liệu thay đổi theo chiều dày kết cấu. Nhờ những tính chất lý tưởng về độ bền cao, mô đun đàn hồi cao và đặc biệt là khả năng bền nhiệt, vật liêu chức năng FGM có rất nhiều ứng dụng rộng rãi trong công nghiệp, nhà máy hạt nhân, hàng không vũ trụ, luện kim và nhiều ứng dụng quan trọng khác. Vì vậy, những năm gần đây các nghiên cứu về kết cấu FGM được nhiều nh...

  • 19.pdf.jpg
  • Article


  • Authors: Pham, Hong Cong; Nguyen, Dinh Duc (2016)

  • This paper presents an analytical approach to investigate the vibration and nonlinear dynamic response of imperfect thin eccentrically stiffened functionally graded material (FGM) plates in thermal environments using the classical plate theory, stress function and the Lekhnitsky smeared stiffeners technique. Material properties are assumed to be temperature-dependent, and two types of thermal condition are investigated: the uniform temperature rise; and the temperature gradient through the thickness. Numerical results for vibration and nonlinear dynamic response of the imperfect eccentrically stiffened FGM plates are obtained by the Runge-Kutta method. The results show the influences ...

Browsing by Author Nguyen, Dinh Duc

Jump to: 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
or enter first few letters:  
Showing results 1 to 16 of 16
  • 83.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc; Nghiem, Thi Thu Ha (2011)

  • Composite material with polymer matrix - titanium particle is widely applied in Vietnam, today. In this paper, the bending of thin polymer composite plate with Titaniump articles under the effect of the steady temperature field is investigated. The paper has established the boundary problem of a simply supported composite plate reinforced by particles under the influence of steady heat transfer process. Using the Navier’s method to solve the problem, an analytic solution of the bending plate given in tiie form of double trigonometric series is obtained. Base on the analytic result, a numerical test is done to find suitable material and clarily the influence of the particles.

  • 108.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc; Nguyen, Thi Thuy (2010)

  • With advantages such as high strength, high stiffness, high chemical resistance, light weight...composite tubes are widely applied in urban construction and petroleum industry. In this report, the authors used the displacement method to study the mechanical behavior (shess, strain...) of an infinite hollow cylinder made of composite material under unsteady, axisymmetric plane temperature field. In the numerical calculations, we mainly studied the influence of time and volume ratio of the particle on the displacement and thermoelastic stress of a cylinder made of Titanium /PVC composite.

  • 129.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc; Hoang, Van Tung (2006)

  • Composite material is widely used in modern structures and the life thank to its advantages. In fact, one has investigated and applied many kinds of three-phase composite material obtained by embedding spherical inclusions into the matrix phase of fibre reinforced material. Seeking solutions for the effective properties of three- phase composite including matrix phase and two other phases, which are spherical particles, has been given in [2]. Basing on algorithm introduced in [2], we have deriven three-phase problem into two two-phase problems and determined the uniaxial mod­ ulus of three-phase composite composed of matrix phase, aligned fibres and spherical inclusions. ...

  • 120.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc; Nguyen, Tien Dac (2006)

  • The composite material reinforced by aligned fibre is an important type of material because of its practical applications in many components of structures. This material is a tranversely isotropic medium having five independent elastic constants. Many researchers are involved in determining these elastic constants. By using com­ plex function method for solving the plane strain problem in elasticity theory, [4] has given a relatively precise method for determining the stiffnesses of transversely isotropic medium. [5] has introduced a method for defining the engineering constants of the composite material reinforced by fibre basing on physical experiments. In this paper, ...

  • 121.pdf.jpg
  • Article


  • Authors: Luu, Manh Ha; Tran, Duc Tan; Nguyen, Thanh Long; Nguyen, Dinh Duc; Nguyen, Phu Thuy (2006)

  • The demand of navigation and guidance has been urgent for many years. In fact, INS is daily used in controlling flight dynamics. Nowadays, with the strong growth of Micro-Electro-Mechanical-System (MEMS) technology, the Inertial Navigation Systems (INS) is applied widely. However, there are existing errors in the accelerometer and gyroscope signals that cause unacceptable drifts. There are two kinds of noise in the INS: deterministic and stochastic errors. The deterministic noises are usually eliminated by the carefully calibration process but the stochastic noises are always difficult to treat. In this paper, we have determined successfully the characteristics of the ME...

  • 101.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc; Dinh, Khac Minh (2010)

  • Composite is a material composed of two or more component material to obtain better properties. 3-phase composite is usually added wwith reinforced fibers and particles. This report presents an experimental study on the bending of some 3-phase composite plates for Vietnam's shipbuilding industry. The studied composite is made of polyester matrix, glass fiber and titanium dioxide particle (TiO2). The numerial study, in which the interaction between the matrix and particle is taken into account, shows good agreement with the experiment.

  • High-frequency-modes-meshfree-analysis-of-Reissner-Mindlin-plates_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Bui, Tinh Quoc; Doan, Duc Hong; Do, Thom Van; Sohichi Hirose; Nguyen, Dinh Duc (2016)

  • Finite element method (FEM) is well used for modeling plate structures. Meshfree methods, on the other hand, applied to the analysis of plate structures lag a little behind, but their great advantages and potential benefits of no meshing prompt continued studies into practical developments and applications. In this work, we present new numerical results of high frequency modes for plates using a meshfree shearlocking-free method. The present formulation is based on Reissner-Mindlin plate theory and the recently developed moving Kriging interpolation (MK). High frequencies of plates are numerically explored through numerical examples for both thick and thin plates with different bounda...

  • 235.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc (2003)

  • The remarkable advantage of composite material is light, durative in physical-chemical envirionment specially in high temperature. Because of its advantages, composite material is being used in various field such as inductry, transport, machine-manufacturing, medicine etc, and specially in manufacturing flying vehicle.

  • 227.pdf.jpg
  • Article


  • Authors: Nguyen, Dinh Duc (2003)

  • Nano material has just been exploited and employed recently. However, its extraodinary and marvelous characteristic opend a new and significal prospect in new material field. There have been numerous mechanical problems that should be taken into consider and being solved. In this article, we want to introduce the concept of nanocrystal, our new results in researching on the material, and problems posing on this industry.

  • 36.pdf.jpg
  • Article


  • Authors: Pham, Hong Cong; Nguyen, Dinh Duc; Dao, Huy Bich (2015)

  • This paper deals with an analysis on the supersonic flutter characteristics of Functionally Graded (FGM) plate under aerodynamic loads. Based upon the classical plate theory and the Ilyushin supersonic aerodynamic theory, the governing equations of FGM plates lying in the moving supersonic airflow are derived. The application of Galerkin method with an approximate two-terms Fourier expansion solution leads to a set of nonlinear auto-oscillation equations for determining the nonlinear flutter response and critical velocity. Numerical results are obtained by fourth-order Runge-Kutta method. The influences of the material properties, geometrical parameters and initial conditions on the s...

  • 26.pdf.jpg
  • Article


  • Authors: Tran, Quoc Quan; Dao, Huy Bich; Nguyen, Dinh Duc (2015)

  • Based on classical shell theory with the geometrical nonlinearity in von Karman-Donell sense and the Ilyushin nonlinear supersonic aerodynamic theory, this paper successfully formulated the equations of motion of the functionally graded cylindrical panel on elastic foundations under impact of a moving supersonic airflow and found the critical velocity of supersonic airflow that make the panel unstable. This paper also used the Bubnov-Galerkin and Runge – Kutta methods to solve the system of nonlinear vibration differential equations and illustrated effects of initial dynamical conditions, shape and geometrical parameters, material constituents and elastic foundations on aerodynamic re...

  • 77.pdf.jpg
  • Article


  • Authors: Vu, Thi Thuy Anh; Nguyen, Dinh Duc (2013)

  • To increase the thermal resistance of various structural components in high-temperature environments, research reports focusing nonlinear axisymmetric response of thin FGM shallow spherical shells with ceramic – metal – ceramic layers (S-FGM) under uniform external pressure and temperature. Equilibrium and compatibility equations for shallow spherical shells are derived by using the classical shell theory and specialized for axisymmetric deformation with both geometrical nonlinearity and initial geometrical imperfection. One-term deflection mode is assumed and explicit expressions of buckling loads and load–deflection curves are determined due to Galerkin method. Stability analysis fo...

  • 20.pdf.jpg
  • Article


  • Authors: Pham, Van Thu; Nguyen, Dinh Duc (2016)

  • In this paper, the problem of nonlinear stability response of imperfect three-phase sandwich laminated polymer nanocomposite panels resting on elastic foundations in thermal environments is investigated using an analytical approach. Governing equations are derived based on classical shell theory, incorporating von Karman–Donnell type nonlinearity, initial geometrical imperfection, and Pasternak type elastic foundations. By applying the Galerkin method, an explicit expression to find the critical load and post-buckling load-deflection curves are obtained. The effects of fibres and nano-particles, material and geometrical properties, foundation stiffness, imperfection, and temperature o...

  • Cover.jpg.jpg
  • Book


  • Authors: Nguyen, Dinh Duc (2014)

  • Nghiên cứu phi tuyến ổn định tĩnh và động, các đáp ứng phi tuyến tĩnh và động của các kết cấu tấm, vỏ vạt liệu composite chức năng FGM, bao gồm các kết cấu tấm, vỏ 2 độ cong, vọ trụ tròn, vỏ cầu FGM. Vật liệu chức năng (FGM) là vật liệu composite thế hệ mới, bao gồm chủ yếu 2 thành phần gốm và kim loại, có sự phân bố thành phần vật liệu thay đổi theo chiều dày kết cấu. Nhờ những tính chất lý tưởng về độ bền cao, mô đun đàn hồi cao và đặc biệt là khả năng bền nhiệt, vật liêu chức năng FGM có rất nhiều ứng dụng rộng rãi trong công nghiệp, nhà máy hạt nhân, hàng không vũ trụ, luện kim và nhiều ứng dụng quan trọng khác. Vì vậy, những năm gần đây các nghiên cứu về kết cấu FGM được nhiều nh...

  • 19.pdf.jpg
  • Article


  • Authors: Pham, Hong Cong; Nguyen, Dinh Duc (2016)

  • This paper presents an analytical approach to investigate the vibration and nonlinear dynamic response of imperfect thin eccentrically stiffened functionally graded material (FGM) plates in thermal environments using the classical plate theory, stress function and the Lekhnitsky smeared stiffeners technique. Material properties are assumed to be temperature-dependent, and two types of thermal condition are investigated: the uniform temperature rise; and the temperature gradient through the thickness. Numerical results for vibration and nonlinear dynamic response of the imperfect eccentrically stiffened FGM plates are obtained by the Runge-Kutta method. The results show the influences ...