Improved Equation for Shear Modulus Using Four-Point Ring-Twist Test Data

There are numerous test-specimen configurations for determining the static shear modulus of composites. Selection of specimen configuration depends primarily on product component configuration. Two-ring specimens in use are the split-ring twist specimen and the four-point-loading ring-twist specimen. The latter is more advantageous, since it uses an intact ring. However, reported validation tests on aluminum rings showed a large error in predicted shear modulus. The present paper provides an improved analysis that takes into account the tilting of the cross section on the loading bar.Yeshttps://us.sagepub.com/en-us/nam/manuscript-submission-guideline

A Method for Measuring Planar Residual Stresses in Rectangularly Orthotropic Materials

A semidestructive method has been developed for determining the principal residual stresses and directions in rectangularly orthotropic materials. The reduction equations are based upon a set of functions that describe the surface strain-relaxation field about a hole drilled to a limited depth into the material. Three constants contained in the strain functions have to be determined by calibration tests; they are related to three general constants and the elastic material constants to establish applicability to an orthotropic material. Expressions for the planar residual-stress components in the material-symmetry directions are then devel oped, and from Mohr's stress circle, the principal residual stresses and directions are determined.Yeshttps://us.sagepub.com/en-us/nam/manuscript-submission-guideline