The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Yoshinobu Tanigawa - One of the best experts on this subject based on the ideXlab platform.
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transient piezothermoelastic analysis of a cross Ply Laminated cylindrical panel bonded to a piezoelectric actuator
Applied Mathematical Modelling, 2005Co-Authors: Yoshihiro Ootao, Yoshinobu TanigawaAbstract:In this study, the theoretical treatment of transient piezothermoelastic problem is developed for a cross-Ply Laminated cylindrical panel bonded to a piezoelectric actuator due to nonuniform heat supPly. By using the exact solutions for cross-Ply Laminate and piezoelectric layer of crystal class mm2, the theoretical analysis of a transient piezothermoelasticity is developed for a simple supported cylindrical composite panel under the state of plane strain. Analysis of a piezothermoelastic problem leads to an appropriate electric potential applied to the piezoelectric layer which suppresses the induced thermoelastic displacement in the radial direction at the midpoint on the free surface of the cross-Ply Laminate. Some numerical results for the temperature change, the displacement, the stress in a transient state when the transient thermoelastic displacement is controlled are shown in figures.
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Control of transient thermoelastic displacement of an angle-Ply Laminated cylindrical panel bonded to a piezoelectric layer
Applied Mathematics and Computation, 2004Co-Authors: Yoshihiro Ootao, Yoshinobu TanigawaAbstract:In this study, the theoretical analysis of a control of transient thermoelastic displacement is developed for an angle-Ply Laminated cylindrical panel bonded to a piezoelectric layer due to nonuniform heat supPly. By using the exact solutions for angle-Ply Laminate and piezoelectric layer of crystal class mm2, the theoretical analysis of a transient piezothermoelasticity is developed for a simPly supported cylindrical composite panel under the state of generalized plane deformation. Analysis of a piezothermoelastic problem leads to an appropriate electric potential applied to the piezoelectric layer which suppresses the induced thermoelastic displacement in the radial direction at the midpoint on the free surface of the angle-Ply Laminate. Some numerical results for the temperature change, the displacement, the stress in a transient state when the transient thermoelastic displacement is controlled are shown in figures.
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analysis of transient thermal stress and thermal deformation of an angle Ply Laminated rectangular plate due to nonuniform heat supPly based on higher order shear deformation theory
JSME international journal. Series A mechanics and material engineering, 1996Co-Authors: Yoshinobu Tanigawa, Kazuki Nagayama, Ryuusuke KawamuraAbstract:This article concerns a theoretical analysis of heat conduction in a transient state and the associated thermoelastic behavior for a multilayered anisotropic Laminated plate subjected to nonuniform heat supPly. As an analytical model, we consider a Laminated rectangular plate consisting of a diagonal stack of layers having orthotropic material properties, i.e., an angle-Ply Laminate. The three-dimensional temperature solution in a transient state and the associated thermoelastic behavior of the plate with simPly supported edge conditions are formulated using the functional approach based on the variational principle. For the analysis of the thermoelastic field, the higher-order shear deformation theory of the plate is used to evaluate the shear stress components. As an example, numerical calculations are carried out for a 2 layered angle-Ply Laminate, and the numerical results for temperature distribution, out-of-plane deflection, normal and shear stress distributions are discussed in detail.
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transient thermal stress and thermal deformation of an angle Ply Laminated rectangular plate due to nonuniform heat supPly based on higher order shear deformation theory
Transactions of the Japan Society of Mechanical Engineers. A, 1995Co-Authors: Yoshinobu Tanigawa, Kazuki Nagayama, Ryuusuke KawamuraAbstract:This paper is concerned with a theoretical treatment of thermal stress and thermal bending problems for a multi-layered anisotropic Laminated plate due to partially distributed heat supPly. As an analytical model, we consider a Laminated rectangular plate consisting of a diagonal pile of layers having orthotropic material properties, i. e. an angle-Ply Laminate. We obtain the three-dimensional temperature in a transient state and thermal deformation of a simPly supported plate using the higher-order shear deformation theory. As an example, numerical calculations are carried out for a 2-layered angle-Ply Laminate, and the numerical results are examined precisely.
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analysis of thermal stress and deformation due to nonuniform heat supPly in an angle Ply Laminated rectangular plate
Transactions of the Japan Society of Mechanical Engineers. A, 1995Co-Authors: Yoshinobu Tanigawa, Ryuusuke Kawamura, Tomohiro Takahara, Kazuki NagayamaAbstract:This paper describes theoretical treatment of problems of thermal stress and thermal bending due to partially distributed heat supPly for a multilayered anisotropic Laminated plate. As an analytical model, we consider a Laminated rectangular plate consisting of a diagonal stack of layers having orthotropic material properties, i. e. an angle-Ply Laminate. Introducing the Rayleigh-Ritz method based on the variational principle, a three-dimensional temperature solution for a transient state is given. Moreover, for the thermoelastic problems, the components of displacements are analyzed using the Rayleigh-Ritz method, and the characteristic behaviors of thermal stress and thermal deformation for a simPly supported plate are determined. As an example, calculations are carried out for a 2-layered angle-Ply Laminate, and the results are examined precisely.
M. Kawai - One of the best experts on this subject based on the ideXlab platform.
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off axis fatigue behavior of a carbon epoxy cross Ply Laminate and predictions considering inelasticity and in situ strength of embedded plies
International Journal of Fatigue, 2008Co-Authors: M. Kawai, N. HondaAbstract:Abstract The off-axis fatigue behavior of a carbon/epoxy symmetric cross-Ply Laminate at room temperature is examined, and a Ply basis fatigue life prediction method is tested with a special emphasis on consideration of the inelastic deformation and in situ strength of the inclined plies embedded in the Laminate. Constant amplitude tension–tension fatigue tests are first performed on the coupon specimens of the cross-Ply Laminate for various fiber orientations. The fiber orientation dependence of the off-axis fatigue data on the cross-Ply Laminate can be removed by normalizing the maximum fatigue stress levels with the help of the associated off-axis static strengths. The distribution of the normalized off-axis fatigue data on the cross-Ply Laminate almost agrees with the normalized fatigue data on the unidirectional Laminate made of the same prepreg tape, indicating that the relative fatigue performance of the cross-Ply Laminate is almost indistinguishable from that of the unidirectional Laminate. A simple off-axis fatigue analysis of the cross-Ply Laminate is then attempted on a Ply basis, in which no effects of progressive damage are assumed. A Ply fatigue model that takes into account the in situ principal strengths of the plies embedded in a general Laminate is developed to this end, along with an analytical procedure for identifying the in situ strength ratios of the actual principal strengths to reference values. The actual stress components in the plies embedded in the cross-Ply Laminate are evaluated using a Laminate constitutive model based on the classical lamination theory, in which the non-linear plastic deformation of inclined plies under in-plane off-axis loading is taken into account. It is demonstrated that good guesses about in situ strength ratios can be made on the basis of elastoplastic CLT analysis, and the off-axis fatigue lives of the cross-Ply Laminate predicted using appropriate in situ strength ratios are shown to agree well with the experimental results.
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Off-axis fatigue behavior of a carbon/epoxy cross-Ply Laminate and predictions considering inelasticity and in situ strength of embedded plies
International Journal of Fatigue, 2008Co-Authors: M. Kawai, N. HondaAbstract:Abstract The off-axis fatigue behavior of a carbon/epoxy symmetric cross-Ply Laminate at room temperature is examined, and a Ply basis fatigue life prediction method is tested with a special emphasis on consideration of the inelastic deformation and in situ strength of the inclined plies embedded in the Laminate. Constant amplitude tension–tension fatigue tests are first performed on the coupon specimens of the cross-Ply Laminate for various fiber orientations. The fiber orientation dependence of the off-axis fatigue data on the cross-Ply Laminate can be removed by normalizing the maximum fatigue stress levels with the help of the associated off-axis static strengths. The distribution of the normalized off-axis fatigue data on the cross-Ply Laminate almost agrees with the normalized fatigue data on the unidirectional Laminate made of the same prepreg tape, indicating that the relative fatigue performance of the cross-Ply Laminate is almost indistinguishable from that of the unidirectional Laminate. A simple off-axis fatigue analysis of the cross-Ply Laminate is then attempted on a Ply basis, in which no effects of progressive damage are assumed. A Ply fatigue model that takes into account the in situ principal strengths of the plies embedded in a general Laminate is developed to this end, along with an analytical procedure for identifying the in situ strength ratios of the actual principal strengths to reference values. The actual stress components in the plies embedded in the cross-Ply Laminate are evaluated using a Laminate constitutive model based on the classical lamination theory, in which the non-linear plastic deformation of inclined plies under in-plane off-axis loading is taken into account. It is demonstrated that good guesses about in situ strength ratios can be made on the basis of elastoplastic CLT analysis, and the off-axis fatigue lives of the cross-Ply Laminate predicted using appropriate in situ strength ratios are shown to agree well with the experimental results.
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Fatigue strengths of cross-Ply CFRP Laminates at room and high temperatures and its phenomenological modeling
International Journal of Fatigue, 2006Co-Authors: M. Kawai, N. MakiAbstract:Abstract Fatigue life prediction for a symmetric alternating cross-Ply carbon/epoxy Laminate subjected to cyclic loading in the fiber direction is attempted on a Ply-by-Ply basis. First, tension–tension fatigue tests are performed under constant amplitude cycling at room and high temperatures. The normalized S – N relationship for the cross-Ply Laminate using the normalized stress level agrees with that for the unidirectional Laminate made of the same prepreg tape. This implies that the on-axis fatigue behavior of the cross-Ply Laminate is substantially governed by that of the constituent plies in the Laminate. Then, to evaluate the in situ strength of the constituent plies in the cross-Ply Laminate, static tension and tension–tension fatigue tests are carried out on unidirectional Laminates with different number of plies. While the tensile strength of unidirectional Laminate significantly depends on the thickness of Laminate, the relative fatigue strength is insensitive to the number of plies. Using a modified Tsai-Hill static failure criterion that considers the in situ strength of plies, we can adequately predict the static tensile strength of the cross-Ply Laminate. Second, based on that fact and the assumption that the final failure of the cross-Ply Laminate is determined by the failure of axial plies, a simple fatigue failure model for the cross-Ply Laminate is developed by means of the classical lamination theory and the Ply fatigue model considering the in situ static strength of plies. Finally, validity of the proposed model for the fatigue failure of symmetric alternating cross-Ply CFRP Laminates is evaluated by comparing with experimental results. It is demonstrated that the fatigue strength of the cross-Ply Laminate in the fiber direction is successfully predicted by the proposed fatigue model with a consideration of the in situ strength of Ply.
N. Honda - One of the best experts on this subject based on the ideXlab platform.
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off axis fatigue behavior of a carbon epoxy cross Ply Laminate and predictions considering inelasticity and in situ strength of embedded plies
International Journal of Fatigue, 2008Co-Authors: M. Kawai, N. HondaAbstract:Abstract The off-axis fatigue behavior of a carbon/epoxy symmetric cross-Ply Laminate at room temperature is examined, and a Ply basis fatigue life prediction method is tested with a special emphasis on consideration of the inelastic deformation and in situ strength of the inclined plies embedded in the Laminate. Constant amplitude tension–tension fatigue tests are first performed on the coupon specimens of the cross-Ply Laminate for various fiber orientations. The fiber orientation dependence of the off-axis fatigue data on the cross-Ply Laminate can be removed by normalizing the maximum fatigue stress levels with the help of the associated off-axis static strengths. The distribution of the normalized off-axis fatigue data on the cross-Ply Laminate almost agrees with the normalized fatigue data on the unidirectional Laminate made of the same prepreg tape, indicating that the relative fatigue performance of the cross-Ply Laminate is almost indistinguishable from that of the unidirectional Laminate. A simple off-axis fatigue analysis of the cross-Ply Laminate is then attempted on a Ply basis, in which no effects of progressive damage are assumed. A Ply fatigue model that takes into account the in situ principal strengths of the plies embedded in a general Laminate is developed to this end, along with an analytical procedure for identifying the in situ strength ratios of the actual principal strengths to reference values. The actual stress components in the plies embedded in the cross-Ply Laminate are evaluated using a Laminate constitutive model based on the classical lamination theory, in which the non-linear plastic deformation of inclined plies under in-plane off-axis loading is taken into account. It is demonstrated that good guesses about in situ strength ratios can be made on the basis of elastoplastic CLT analysis, and the off-axis fatigue lives of the cross-Ply Laminate predicted using appropriate in situ strength ratios are shown to agree well with the experimental results.
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Off-axis fatigue behavior of a carbon/epoxy cross-Ply Laminate and predictions considering inelasticity and in situ strength of embedded plies
International Journal of Fatigue, 2008Co-Authors: M. Kawai, N. HondaAbstract:Abstract The off-axis fatigue behavior of a carbon/epoxy symmetric cross-Ply Laminate at room temperature is examined, and a Ply basis fatigue life prediction method is tested with a special emphasis on consideration of the inelastic deformation and in situ strength of the inclined plies embedded in the Laminate. Constant amplitude tension–tension fatigue tests are first performed on the coupon specimens of the cross-Ply Laminate for various fiber orientations. The fiber orientation dependence of the off-axis fatigue data on the cross-Ply Laminate can be removed by normalizing the maximum fatigue stress levels with the help of the associated off-axis static strengths. The distribution of the normalized off-axis fatigue data on the cross-Ply Laminate almost agrees with the normalized fatigue data on the unidirectional Laminate made of the same prepreg tape, indicating that the relative fatigue performance of the cross-Ply Laminate is almost indistinguishable from that of the unidirectional Laminate. A simple off-axis fatigue analysis of the cross-Ply Laminate is then attempted on a Ply basis, in which no effects of progressive damage are assumed. A Ply fatigue model that takes into account the in situ principal strengths of the plies embedded in a general Laminate is developed to this end, along with an analytical procedure for identifying the in situ strength ratios of the actual principal strengths to reference values. The actual stress components in the plies embedded in the cross-Ply Laminate are evaluated using a Laminate constitutive model based on the classical lamination theory, in which the non-linear plastic deformation of inclined plies under in-plane off-axis loading is taken into account. It is demonstrated that good guesses about in situ strength ratios can be made on the basis of elastoplastic CLT analysis, and the off-axis fatigue lives of the cross-Ply Laminate predicted using appropriate in situ strength ratios are shown to agree well with the experimental results.
M M Shokrieh - One of the best experts on this subject based on the ideXlab platform.
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residual stiffness in cross Ply Laminates subjected to cyclic loading
Composite Structures, 2008Co-Authors: Fathollah Taheribehrooz, M M Shokrieh, Larry LessardAbstract:Abstract A new approach has been developed to evaluate the residual stiffness of cross-Ply Laminates under tensile fatigue loading. In the present research, a stiffness degradation model is generalized by using a new fatigue life measure and shear-lag analyses to improve correlation at low fatigue cycles and high stress states. The developed model is integrated into a progressive approach to predict the transverse stiffness degradation of 30° unidirectional plies made of AS4/3501-6 carbon/epoxy under both constant and variable amplitude cyclic tensile loading. Also, the stress history in 0° and 90° plies and transverse stiffness degradation in 90° plies of a cross-Ply Laminate are predicted by using the developed model. The generalized model, in contrast to original one, is capable of simulating stiffness reduction under high stress states where failure occurs in transverse plies of a cross-Ply Laminate during the first cycles of the fatigue loading. Predicted results by the model show a good correlation with the experimental data.
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three dimensional stress analysis of free edge effects in a simple composite cross Ply Laminate
International Journal of Solids and Structures, 1996Co-Authors: Larry Lessard, Andrew S Schmidt, M M ShokriehAbstract:Abstract A new model has been developed to analyze the free-edge effect in a symmetric cross-Ply Laminate. This new technique involves a three-dimensional finite element analysis that divulges the stress field at the free edge of a simple composite plate of finite dimensions. Three-dimensional 20-node quadratic brick elements were used to simulate the composite Laminate. The cross-Ply Laminate is subjected to uniaxial tensile strain. The advantages of the “Slice Model Setup” are demonstrated in terms of computer time and memory. The slice model has been developed to simulate the actual case, and anticipated stress singularities have therefore not been induced artificially by using singular elements. The state of stress is determined and the results are favorably compared to the results of others found in the literature. The effect of thickness and width of a simple composite plate on the magnitude of stress at the free edge is also investigated. The purpose of the slice model is to create a reasonable finite element model whose state of stress can undergo failure analysis and whose elements can permit the use of property degradation techniques.
Larry Lessard - One of the best experts on this subject based on the ideXlab platform.
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residual stiffness in cross Ply Laminates subjected to cyclic loading
Composite Structures, 2008Co-Authors: Fathollah Taheribehrooz, M M Shokrieh, Larry LessardAbstract:Abstract A new approach has been developed to evaluate the residual stiffness of cross-Ply Laminates under tensile fatigue loading. In the present research, a stiffness degradation model is generalized by using a new fatigue life measure and shear-lag analyses to improve correlation at low fatigue cycles and high stress states. The developed model is integrated into a progressive approach to predict the transverse stiffness degradation of 30° unidirectional plies made of AS4/3501-6 carbon/epoxy under both constant and variable amplitude cyclic tensile loading. Also, the stress history in 0° and 90° plies and transverse stiffness degradation in 90° plies of a cross-Ply Laminate are predicted by using the developed model. The generalized model, in contrast to original one, is capable of simulating stiffness reduction under high stress states where failure occurs in transverse plies of a cross-Ply Laminate during the first cycles of the fatigue loading. Predicted results by the model show a good correlation with the experimental data.
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three dimensional stress analysis of free edge effects in a simple composite cross Ply Laminate
International Journal of Solids and Structures, 1996Co-Authors: Larry Lessard, Andrew S Schmidt, M M ShokriehAbstract:Abstract A new model has been developed to analyze the free-edge effect in a symmetric cross-Ply Laminate. This new technique involves a three-dimensional finite element analysis that divulges the stress field at the free edge of a simple composite plate of finite dimensions. Three-dimensional 20-node quadratic brick elements were used to simulate the composite Laminate. The cross-Ply Laminate is subjected to uniaxial tensile strain. The advantages of the “Slice Model Setup” are demonstrated in terms of computer time and memory. The slice model has been developed to simulate the actual case, and anticipated stress singularities have therefore not been induced artificially by using singular elements. The state of stress is determined and the results are favorably compared to the results of others found in the literature. The effect of thickness and width of a simple composite plate on the magnitude of stress at the free edge is also investigated. The purpose of the slice model is to create a reasonable finite element model whose state of stress can undergo failure analysis and whose elements can permit the use of property degradation techniques.