Journal Article


A fracture condition incorporating the most unfavourable orientation of the crack

Abstract

A fracture condition incorporating the most unfavourable orientation of the crack has been derived to improve the safety of loaded brittle components with complex shape, whose loading results in a three-dimensional stress state. With a single calculation, an answer is provided to the important question whether a randomly oriented crack at a particular location in the stressed component will cause fracture. Brittle fracture is a dangerous failure mode and requires a conservative design calculation. The presented experimental results show that the locus of stress intensity factors which result in mixed-mode fracture is associated with significant uncertainty. Consequently, a new approach to design of safety–critical components has been proposed, based on a conservative safe zone, located away from the scatter band defining fracture states. A postprocessor based on the proposed fracture condition and conservative safe zone can be easily developed, for testing loaded safety–critical components with complex shape. For each finite element, only a single computation is made, which guarantees a high computational speed. This makes the proposed approach particularly useful for incorporation in a design optimisation loop.

Attached files

Authors

Todinov, M
Same, S

Oxford Brookes departments

Faculty of Technology, Design and Environment\Department of Mechanical Engineering and Mathematical Sciences

Dates

Year of publication: 2015
Date of RADAR deposit: 2016-07-26



Related resources

This RADAR resource is the Accepted Manuscript of A fracture condition incorporating the most unfavourable orientation of the crack

Details

  • Owner: Rosa Teira Paz
  • Collection: Outputs
  • Version: 1 (show all)
  • Status: Live