Abstract
The paper will consider a set of biaxial experiments, conducted using a cruciform specimen design, manufactured from Waspaloy, a nickel superalloy used in aircraft engine disks. These are analysed using a number of standard, as well as novel, multiaxial fatigue parameters. The results show that most of the existing parameters appear to correlate the results adequately in the region which can be accessed by tension-torsion experiments, but are much less convincing outside this range. A number of potential alternative approaches will be discussed and compared with the experimental results.
Highlights
Many engineering components in service suffer multiaxial loading
Since the majority of fatigue cracks in low and high cycle fatigue initiate at the surface, we can reduce the field of practical interest for most applications to that of biaxial loading
There remains the complication of the type of biaxial loading
Summary
Many engineering components in service suffer multiaxial loading. Examples include pressure vessels, aircraft engine discs and frictional contact interfaces. Multiaxial experiments are expensive, and even may not simulate the required loading conditions very closely. A cruciform specimen design might be thought reasonable, and capable of simulating the required loading conditions. Such experiments are still expensive, and frequently tension-torsion tests are carried out as a cheaper alternative. The most complex case is where the principal stress directions vary, as can be the case with frictional contact, such as fretting fatigue experiments. There are many which are not: e.g. aircraft engine disks, or pressurised aircraft fuselages In both of these cases, the stress field produced has a positive biaxiality, which cannot be investigated using the most common type of biaxial test machine, the servo-hydraulic tension-torsion machine. The majority of candidate multiaxial fatigue criteria have been validated primarily against tension/torsion experiments
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
