Measurement of 3 Principal Residual Stresses in Polar-Anisotropic Cylinder : Principal Residual Stresses in Log

概要

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Sachs and Mesnager described measurements of three principal residual stresses of an isotropic cylinder in the directions of radial, circumferential and longitudinal axes. They are not applicable to a curvilinear-orthotropic or polar-anisotropic body because of their large errors. For the purpose of study about "Ate"of a log (reaction wood), one must know the order of the residual stress values of it. Though a log is composed of biologic fibers, it is proper to consider it approximately as a polar-anisotropic body in mechanical handling such as deformation or force in case of log sawing. The authors derive the measurement of three principal residual stresses in a polar-anisotropic cylinder. The authors'formulas involve Sachs'and Mesnager's formulas as special case of elastic compliances. Then the authors measured and calculated three principal residual stresses in a log by their method.
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