Plastic Strain Ratio and Texture Coefficients in Orthotropic Sheets of Cubic Metals

Since first demonstrated by Stickels and Mould [1], there has been ample evidence that some elastic and plastic anisotropic parameters of cold-rolled and annealed steel sheets are correlated. These correlations suggest that some formability parameters of steel sheets (e.g., the average (plastic) strain ratio r¯ , the planar anisotropy Δr, etc.), which are usually determined by destructive tests, could possibly be inferred from nondestructive measurements of elastic anisotropic parameters. Indeed, much work has been done lately in exploring the possibility of on-line determination of r-value of steel sheets by ultrasonic techniques. [2–5]