Session: CS-07-02 The Warren H. Bamford Memorial Symposium on Recent Developments in ASME Codes and Standards-2

Paper Number: 153911

153911 - Material Anisotropy in Section Viii 

Abstract: 

INTRODUCTION

There have been many revisions to Section VIII, Divisions 1 and 2 to address the issue of material anisotropy.  Anisotropy is the behavior of a material such that its properties differ depending on the direction of the testing.  This paper addresses the latest changes addressing this technical topic in the 2025 Edition.

EVOLUTION AND TECHNICAL BACKGROUND OF THE ANISOTROPY RULES IN THE CODE

The general technical background and evolution of Code rules thus far was presented live in PVP 2018 and in paper PVP2018-84823 (unpublished).  Lab testing and its evaluation was presented virtually at PVP 2020 and in paper PVP2020-21020 (unpublished).  The results of these two papers are now codified in the 2025 Edition of Section VIII, Divisions 1 and 2.

CURRENT STATUS OF THE ANISOTROPY RULES IN THE CODE AND THEIR TECHNICAL SUBSTANTIATION

In the 2025 Edition, there are editorial and technical revisions to the requirements for parts machined from bar:

·       Revised the tension test requirements.

·       Added permissions for additional types of components that can be machined from bar.

·       A Table and two Figures are added to provide clarity to the requirements.

·       The 50% penalty on design values is expanded in its scope of applicability.

Also in the 2025 Edition, rules addressing plate anisotropy are revised

Presenting Author: Jay Cameron HSB (Hartford Steam Boiler)

Presenting Author Biography: Jay joined Hartford Steam Boiler in 1992. He holds a B.S. degree in Mechanical Engineering, Engineering Mechanics from Worcester Polytechnic Institute and an M.S. degree in Metallurgy from Rensselaer Polytechnic Institute, and is a Registered Professional Engineer. Since joining Hartford Steam Boiler, Jay has worked in the Home Office and at Mechanical & Materials Engineering (Austin, TX). Jay provides technical assistance for all non-nuclear ASME Boiler and Pressure Vessel Codes and the National Board Inspection Code (NBIC), and supports clients with design reviews. His technical expertise is in the areas of pressure vessel design and repair, stress analysis, and materials.
Jay currently serves as an ASME Committee Member of BPV II (Materials), Subgroup on Materials (BPV VIII), and Special Committee on Interpretations (BPV VIII). He has presented courses on pressure vessel design and materials to audiences around the world. Prior to joining Hartford Steam Boiler, Jay worked in the aerospace gas turbine and oilfield exploration equipment industries.

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