摘要:

The problem of determining the distribution of the thermal stresses in the neighborhood of a penny-shaped Crack of defined deformed shape under general temperature conditions is solved The defined deformed shape of the crack surfaces are not symmetric about the plane z = 0. The crack surfaces are subjected to uneven temperature; that is, the temperature applied on the upper surface is different from the lower surface. This problem physically corresponds to the case in which a thin circular disclike inclusion is situated in an infinite medium whose faces are subjected to different temperature. A closed form solution is obtained, reducing the problem to a set of Abel integral equations. The thermal stress singularities at the rim of the thin disclike inclusion is discussed In a special case of temperature conditions, thermal stresses at a general point of the medium are obtained and presented graphically.

ISSN:0149-5739    

DOI:10.1080/01495739708956088

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The optimal designs of laminated plates subject to nonuniform temperature distributions are given for maximum buckling temperature. The method of solution involves the finite element method based on Mindlin plate theory and numerical optimization. A computational approach is developed that involves successive stages of solution for temperature distribution, buckling temperature, and optimal fiber angle. Three different temperature loadings are considered and various combinations of simply supported and clamped boundary conditions are studied. The effect of plate aspect ratio on the optimal fiber angle and the maximum buckling temperature is investigated. The influence of bending-twisting coupling on the optimum design is studied by considering plates with an increasing number of layers.

ISSN:0149-5739    

DOI:10.1080/01495739708956089

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The effects of transient thermal loads on the propagation of cracks in brittle substrate caused by the residual tension in a brittle film are studied using a finite element approach. Based on the assumption that cracks in homogeneous brittle solids seek a trajectory for which KII= 0, the results show how the crack trajectory change from transient growth to steady state depends upon the film thickness, the ratio of the elastic moduli of the film and substrate, the rate of application of the thermal load, and time.

ISSN:0149-5739    

DOI:10.1080/01495739708956090

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

An axisymmetric quasi-static thermoelastic contact problem for a two-layer isotropic infinite hollow circular cylinder with factional heating and thermal resistance on the contact surface is examined Based on the solution of the corresponding steady-state problem, the existing conditions are analyzed. In the transient problem, thermal expansion due to fictional heating modifies the contact pressure and can lead to instability resulting in seizure. The results received in the present study are adapted for the investigation of the critical angular velocity of such a system and can be used to project the cylindrical friction units while working in the conditions of dry friction.

ISSN:0149-5739    

DOI:10.1080/01495739708956091

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

A three-dimensional exact solution is presented for a simply supported, cross-ply laminated finite cylindrical panel with some piezoelectric layers subjected to thermoelectromechanical load. The variables are expanded in Fourier series to satisfy the boundary conditions at the ends. The solution is constructed as a product of an exponential function and a power series. The field equations yield characteristic equations for the exponents and recursive relations for the coefficients of the power series. Results are presented for thermoelectrical load to illustrate the effect of the thickness parameter. The feasibility of reducing deflection and stresses due to thermal load by actuating a piezoelectric layer is reported The effectiveness of various actuating schemes for shape control of thermally loaded panel is investigated.

ISSN:0149-5739    

DOI:10.1080/01495739708956092

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

A two-dimensional, curvilinear, isoparametric, finite element is used to provide a discrete layer analysis of deformations and stresses in stiffened, cross-ply composite cylinders subjected to thermal-mechanical loading. The generalized plane problem is analyzed by considering a discrete layer representation of a generic transverse cross section of the stiffened cylinder to provide the complete three-dimensional stale of stress. Individual layers of the cylinder and the stiffener are modeled explicitly, providing an accurate and detailed representation of deformations and stresses including interlaminar stresses. Cross-ply skins with cross-ply or unidirectional stiffeners are studied for fabrication-induced residual thermal effects, applied axial strain, torsion, and internal pressure loading. The analysis shows that local curvatures and interlaminar stress concentrations are present near the skin / stiffener joint. Interlaminar stresses are also present along the free edge of the stiffener.

ISSN:0149-5739    

DOI:10.1080/01495739708956093

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor