Standard Practice for Estimating the Approximate Residual Circumferential Stress in Straight Thin-walled Tubing
|Publication Date:||1 November 2013|
|ICS Code (Iron and steel pipes):||23.040.10|
|ICS Code (Non-ferrous metal pipes):||23.040.15|
A qualitative estimate of the residual circumferential stress in thin-walled tubing may be calculated from the change in outside diameter that occurs upon splitting a length of thin-walled tubing. This practice assumes a linear stress distribution through the tube wall thickness and will not provide an estimate of local stress distributions such as surface stresses. (Very high local residual stress gradients are common at the surface of metal tubing due to cold drawing, peening, grinding, etc.) The Hatfield and Thirkell formula, as later modified by Sachs and Espey,2 provides a simple method for calculating the approximate circumferential stress from the change in diameter of straight, thin-walled, metal tubing.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
*A Summary of Changes section appears at the end of this standard
2 Sachs, G. and Espey, G., "A New Method for Determination of Stress Distribution in Thin-walled Tubing," Transactions of the AIME, Vol 147, 1942.