In this paper, the high frequency induction heating apparatus developed by the authors is used to analyze thermal stresses produced in the disk with star-shaped hole rounded the tip. The photoelastic experiment for the epoxy disk models perforated various star-shaped holes is performed in steady-state temperature distribution under heating conditions of 50°C and 0°C on the inner and outer edges, respectively. Some of the experimental values are compared with the numerical values by means of finite element method.

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In general, a wooden column can be assumed as an anisotropic member that has different modulas of rigidity in the direction perpendicular to the annual ring. By taking the stress function, an anisotropic wooden column loaded by torque can be solved and compared with isotropic solution. The solution of torsional problem in isotropic has been related to the membrane analogy. Hence, the corresponding torque acting to column can be obtained by experimentation of membrane analogy. And in the case of anisotropic problems the stress acting to the column can be investigated by making a comparison between new experimental method and theory.

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This paper describes a new method of finding the moments distribution in an isotropic plate by means of ordinate measurements on a photoelastic experiments. The photoelastic plates are made from frozen stress treatments. The method involves the numerical integration of the Laplace's and Poisson's type difference equations over an investigating region, but without recourse to isocline lines. The results are presented in vector form as normal load against bending moment distribution for skew plate and swept-back plate, respectively.

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This study investigated stress distribution in the contact region of the disk using the two-dimensional photoelastic technique and numerical calculations. The position and intensity of maximum shearing stress are derived and, principal stresses and its directions can be obtained easily by the presented analysis with photoelastic patterns. The agreements between the photoelastical and theoretical results are satisfactory.

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A two-dimensional stress state is analyzed using the interferometric photoelasticity and the finite element method (FEM) separately to compare the accuracy of the results obtained by the respective methods. “A strip with a central hole under tension” is chosen as the two-dimensional stress problem because it is a well known case which has been solved rigorously by Howland. The results show that, so far as the stress concentration factor is concerned, the accuracy of the FEM depends entirely on the member of finite elements especially near the hole, while the interferometric method constantly gives satisfactory values provided that sufficiently plane-parallel model plated are prepared.

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