摘要:

It is well known that the thermoelastic coupling term and the inertia term have to be taken into account in the treatment of problems involving a sudden change of temperature, such as thermal-shock problems. It is difficult to find the exact solution for coupled thermal-stress problems, and these have been solved only for the case of a one-dimensional temperature change such as in the semi-infinite regions.

ISSN:0149-5739    

DOI:10.1080/01495738108909980

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

A generalized variational principle for dynamic problems of thermoviscoelastic plates is formulated. The solution of the problem by the Laplace transform-finite-element method is then proposed, and properties of eigenvalues and the convergence of the method are analyzed.

ISSN:0149-5739    

DOI:10.1080/01495738108909981

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

In shipyard panel-production lines several rectangular plates are butt welded to form large panels. One problem is the tendency of hot cracking in the end portion of the butt weld. In this paper transient temperature fields and stress fields in butt-welded plates are calculated using the finite-element method. The calculations are performed for different welding speeds, for different heat inputs, and for one-sided and two-sided welding. The calculated temperature fields and stress fields are compared to available experimental data. In general, good agreement is found. The location of the calculated maximum transverse tensile stresses and strains are compared to the location of hot cracks from available data. It is concluded that the hot cracks may nucleate at temperatures around l200°C due to high transverse tensile strains. The cracks may then propagate at a temperature of about 400°C, when the maximum transverse tensile stresses arise. The influence of the welding speed on the formation of hot cracks seems to be negligible. High arc energy gives high transverse tensile strains. These strains are believed to be the reason for the large number of hot cracks found in butt welding of large plates where high arc energies are used.

ISSN:0149-5739    

DOI:10.1080/01495738108909982

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

A method is presented that enables thermal crack and contact problems to be reduced in a simple way to those of the isothermal case and pertinent solutions to be obtained. The method is valid for elastic space or semispace and for a layer that is isotropic or transversally isotropic. Illustrative examples are given for axially symmetric cases.

ISSN:0149-5739    

DOI:10.1080/01495738108909983

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

In 1964 Chadwick and Windle published a detailed investigation of the secular equation governing the propagation of surface waves in a semi-infinite,isotropic, heat-conducting elastic body the surface of which is traction-free and either at constant uniform temperature or thermally insulated. The purpose of the present paper is first to remedy a defect in the work of Chadwick and Windle and then to extend the scope of their analysis by allowing the transmitting body to exchange heat with a constant-temperature environment. The defect arises from the insufficiency of the criteria used to decide whether or not a branch of the algebraic function defined by the rationalized secular equation represents a surface wave. When it is corrected the non-uniqueness of the surface-wave solutions found by Chadwick and Windle is removed and there exists precisely one quasi-elastic surface wave for all frequencies and for all values of the heat-transfer coefficient appearing in the thermal boundary condition, including the extremes considered in the original study.

ISSN:0149-5739    

DOI:10.1080/01495738108909984

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

A model for bodies with shape memory which has been proposed by Müller [1] can be made to simulate creep and strain hardening of such bodies at low temperatures. The model will do so if a simple evolution law for the transition between martensitic twin configurations is postulated and if a prescription about the distribution of loads within the model is accepted. A numerical evaluation of the formulas permits predictions about the behavior of the model under dynamic loading and for various conditions of thermal contact with the environment.

ISSN:0149-5739    

DOI:10.1080/01495738108909985

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0149-5739    

DOI:10.1080/01495738108909986

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor