Back to results
US 10,094,751 B2Granted
System and method for determining direct damage tolerance allowables
AssigneeBell Helicopter Textron Inc.
InventorsXiaoming Li, Bogdan R. Krasnowski
Life of this patent
Estimating the term…
Abstract
A method of determining damage tolerance allowables in a specimen, the method includes applying a cyclic load to a specimen until a first crack emanates from a notch in the specimen, the cyclic load having a maximum load and a minimum load. The method also includes applying a subsequent cyclic load to the specimen until the first crack grows to form a second crack emanating from the first crack, the subsequent cyclic load having the same maximum load but a greater minimum load.
Claims18
A method of determining damage tolerance allowables in a specimen, the method comprising:
- preparing the specimen by inducing a notch located in an exterior corner thereof;
- applying an initial cyclic load to the specimen, until a first crack emanating from the notch is detected, the initial cyclic load having an initial maximum load and an initial minimum load;
- applying a subsequent cyclic load to the specimen until extension of the first crack to form a second crack emanating from the first crack is detected, the subsequent cyclic load having a second maximum load and a second minimum load, wherein the second maximum load is the same as the initial maximum load and the second minimum load is greater than the initial minimum load;
- determining a flaw threshold stress based upon the initial maximum load and the initial minimum load for which the first crack starts to emanate from the notch;
- and
- determining a crack threshold stress for which the second crack grows from the first crack based upon the second maximum load and the second minimum load.
3 more elements
Dependencies are inferred from the claim text.