Requirement for "Checkstress"
Requirement for "Checkstress"
(OP)
I'm currently involved in the "Checkstress" activity for a civil aircraft project. I know that checkstress is meant to be an independant check of the stress analysis but is it a EASA/FAA/JAA requirement to do this and if so can anyone point me towards the necessary documentation defining the requirement?





RE: Requirement for "Checkstress"
i see it as an analysis exercise (a very useful one) to have a 2nd pair of eyes analyze a structure and prepare the formal certification stress analysis reports (as opposed to the "sizing" calcs done during the design development).
good luck
RE: Requirement for "Checkstress"
RE: Requirement for "Checkstress"
I am not aware of any empirical requirements docuemnt for CS, Airbus issue their own CS stressing methods, i.e. methods that have to be used for CS otehrwise the results are not accepted. Sometimes an alternate method is submitted to the methods group, which can allow non-Airbus CS methods to get thru.
So, your CS list remains ellusive, l suggest that an ad-hoc requirement list would include: External loads, FEM validation, Internal loads, stressing methods, spreadsheet validation, assumption checks, inclusion of post-test factors, compliance checklist, RF summary and (if Airbus) production of ACD4 ACD6 and final stress dossiers, for the authorities.
I may have left something out, but its a start.
RE: Requirement for "Checkstress"
It entails reporting, calculating and making sure the following are confirmed correct:
1. Geometry
2. Material Allowables
3. Loads
4. Analysis
The above list is the *minimum* that your checkstress should entail.
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Nert
RE: Requirement for "Checkstress"