Crack driving forces under creep conditions in presence of material inhomogeneity

ABSTRACT

Under time-dependent creep deformation in metallic materials in the presence of a crack, the driving force is influenced at a distance in the presence of a zone (such as an interlayer, interface, hole, etc.) which deforms differently in reference configuration. This influence may increase or decrease the crack driving force based on the type of inhomogeneity (elastic, plastic, creep). The nature and extent of influence of material inhomogeneity are studied in this work with a configurational force-based rate of crack driving force definition for a crack in the presence of dissimilar metal weld zone, HAZ and second base metal.

KEYWORDS:

• Creep crack
• material inhomogeneity
• configurational forces
• dissimilar metal Weld

Acknowledgments

The authors acknowledge the Science and Research Board (SERB) for funding for the work under project SRG/2021/000523 titled “Application of configurational force based concept of material inhomogeneity to enhance crack resistance of materials” and Indian Institute of Technology Ropar for the infrastructural support.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Science and Engineering Research Board [SRG/2021/000523].