PHOTOELASTIC STRESS-ANALYSIS OF ORTHOTROPIC MATERIALS BY USING AN ISOTROPIC PLATE

Based on the two-dimensional theory of elasticity for an orthotropic p late, relations between stress components produced in two different or thotropic plates are considered acid the conditions to realize the sim ilar stress fields in different orthotropic plates are studied, On the basis of the similarity law, a convenient photoelastic method to anal yze stress fields in an orthotropic plate, using an isotropic plate, i s presented. Two examples are treated, One deals with the stress-conce ntration problem around a circular hole in a strip with edges parallel to the symmetric axis of elasticity, In the second example, the edges of the strip are assumed to be inclined by 30 deg to the elastically symmetric axes, The experimental results are compared with theoretical calculations.