Considerations on the measurement of creep strain in Bridgman notches

Abstract

Blunt circumferential (Bridgman) notched tensile creep testpieces are used for determining material property data under a multi-axial stress state at high temperatures. The correlation between axial and diametral strain measurements is considered, together with the practical matters associated with the use of diametral extensometers used for notch creep strain measurement. This paper contains underpinning information relevant to a new Code of Practice for Notch Bar Creep Testing [1].

Keywords:

• Bridgman notches
• diametral strain
• creep
• multi-axial stress states.