Unsteady Thermal Stress Research Articles

Analytical solution of nonaxisymmetric unsteady thermal stress in a hollow disk of variable thickness.

Analytical solution of nonaxisymmetric unsteady thermal stress in a hollow disk of variable thickness.

ANALYTICAL SOLUTION FOR UNSTEADY THERMAL STRESSES IN AN INFINITE CYLINDER COMPOSED OF TWO MATERIALS

An exact analytical solution for unsteady thermal stresses in an infinitely long solid composite cylinder is presented. The unsteady temperature field is determined following Ozisik's (1980) treatment, but a more general solution is achieved by the present approach by considering a heat convection situation at the outer boundary. The plane stress and plane strain states are considered next, and the thermal stresses are evaluated. Results are provided as dimensionless plots for several combinations of thermal and mechanical parameters of practical interest. 6 references.

Unsteady thermal stress analyses by means of combined boundary element and charge simulation methods

Unsteady thermal stress analyses by means of combined boundary element and charge simulation methods

Analysis of stress intensity factors for surface cracks subject to arbitrarily distributed surface stresses.

A weight function method has been developed to analyze the stress intensity factors for surface cracks which are subject to arbitrarily distributed surface stresses. The method is based upon the superpositon of the unit distributed load at each nodal point on the cracked surface. It can be easily incorporated with the ordinary three dimensional finite element code which utilyzes the 20-noded isoparametric elements with quadratic shape functions. Some examples in the paper show that the method guarantees the reasonable accuracy and that it is effective especially for the analysis of unsteady thermal stress problems.

Three-Dimensional Unsteady Thermal Stresses in a Thick Circular Plate under Eccentric Partial Heat Source

有限円柱の一つの端面に偏心円形熱源のある問題は,平面熱応力問題として解決できない厚肉円板の,一方の平たん部の境界面に偏心円形熱源の問題ともなり,工業上有用性が多い.この問題は完全ないわゆる三次元熱応力問題による解析によらねばならない.本研究は熱弾性変位ポテンシャル,ミッチェルおよびブシネの関数の三者に関する熱弾性基礎方程式を解いて,非定常熱応力分布を求めた.

Three Dimensional Unsteady Thermal Stresses of a Solid and Finite Circular Cylinder due to a Rotating Heat Source

製私用の円柱形圧延ロールがアーク状の面熱源の作用を受け, 特に低速度の回転状態の場合には, 三次元熱応力問題として処理されなくてはならない. 本報は, 有限長さの中実円柱に局部的な回転面熱源が作用した場合の三次元非定常熱応力問題を熱弾性変位ポテンシャル, Michell の関数および Boussinesq の関数を用いて解析したものである. さらに具体例として数値計算を遂行し, 三次元熱応力分布を明らかにした.

Unsteady thermal stress problems in a doubly connected domain by conformal mapping

Unsteady thermal stress problems in a doubly connected domain by conformal mapping

An Analysis of Unsteady Thermal Stresses in Rolls of CCP under a Rotating Heat Source

The subject treated in this paper forms a part of a more precise thermomechanical consideration in designing of rolls in the continuous casting plant at the iron manufacture. From an analytical point of view, a fundamental problem in rolls is reduced to the problem of solving the transient thermal stress in a hollow circular cylinder due to a rotating arc heat source with a constant angular velocity. Numerical results are given for the thermal stress distribution in actual rolls.

THERMAL-STRESS PROBLEMS IN INDUSTRY. 4: THERMAL STRESSES AND DEFORMATIONS IN A PUNCH DURING SHEET-METAL BLANKING

The results of a theoretical analysis of the thermal stresses and deformations in a punch during sheet-metal blanking are presented. The problem is reduced to the determination of the unsteady thermal stresses and deformations in a semi-infinite circular cylinder subjected to finite surface heat generation over its lateral surface.

Length effects of unsteady thermal stresses in a finite short circular cylinder with an arbitrary heat supply

An unsteady thermoelastic study, taking consideration of the length effects, was made of a finite short circular cylinder under an arbitrary heat supply along its cylindrical surface in the longitudinal direction. The analysis was treated by the thermoelastic potential method using a general form of the Love's displacement function which has not so far been used. The results obtained were compared with those of an approximate solution for the finite cylinder using Saint-Venant's principle. From the results the effects of the length-to-diameter ratio evidently appear in the transient thermal stress distributions for the finite short cylinder.

Unsteady Thermal Stresses in a Thick Circular Cylinder with a Square Hole

Unsteady Thermal Stresses in a Thick Circular Cylinder with a Square Hole

Unsteady Thermal Stress Problem in an Orthotropic Hollow Circular Disk Due to Many Continuous Point Heat Sources

Unsteady Thermal Stress Problem in an Orthotropic Hollow Circular Disk Due to Many Continuous Point Heat Sources

Unsteady Thermal Stress Problem in an Orthotropic Hollow Circular Disk Due to an Istantaneous Point Heat Source

Unsteady Thermal Stress Problem in an Orthotropic Hollow Circular Disk Due to an Istantaneous Point Heat Source

Unsteady thermal stresses developing during the chilling of amorphous bodies

Unsteady thermal stresses developing during the chilling of amorphous bodies

Unsteady thermal stresses in fuel elements under heat generation

In designing some types of fuel elements, it is necessary to find the thermal stresses in a continuous medium performated by cylindrical channels of circular cross-section. In order to set up the problem, assume that the strength and heat transfer calculation are based on the phenomena that occur in a typical unit lattice cell, and that the heat generation is uniform over the whole section: Therefore, the problems reduce to solve the temperature and thermal stresees in a polygonal prism with a central circular hole under uniform heat generation and for insulated outer boundary. In out previous papers we obtained the steady thermal stress distribution in such formed regions by use of the five elementary functions method.In starting up or shutting down of the reactor, however, the problem becomes one of the unsteady state. It is felt that no analysis has been given to the transient thermoelastic problem of the multiply-connected region. The problems considered here are concerned with unsteady thermal stresses in a polygonal prism with a circular hole under a uniform heat generation. The solving process is divided into two basic steps. First, the heat conduction equation is solved by the technique of Laplace transform. Secondly, the plane thermoelastic problem is solved by use of the five elementary functions method. Throughout the treatment of both problems, in order to satisfy the boundary conditions, we use the point-matching technique in conjunction with the least square method.

Unsteady Thermal Stresses in a Square Prism with a Circulat Hole under Uniformig Heat Generation

Unsteady Thermal Stresses in a Square Prism with a Circulat Hole under Uniformig Heat Generation

Un-Steady Thermal Stresses on a Hollow Circular Disk Due to an Instantaneous Point Heat Source

Un-Steady Thermal Stresses on a Hollow Circular Disk Due to an Instantaneous Point Heat Source

Thermal Stress of Thick-Walled Cylinder in the Elastoplastic Region

Unsteady thermal stress of thick-walled cylinder in the case of rapid cooling of the bore was analyzed by two methods; the elastoplastic stress analyzed by successive approximation proposed by S. S. Manson, and the viscoelastic stress according to the associate elastic problem, applying the analogy between the elastic and the viscoelastic solution.Numerical calculation was also made of the stress for the cylinders of several dimensions.The theoretical stress distribution was compared with the experimentally decided stress distribution based on the residual stress, and it was found that there was very good agreement between them.

多孔質〜中空ゴムボール系による熱応力アナログについて

多孔質〜中空ゴムボール系による熱応力アナログについて