Allowables for 7075-T6 per WW-T-700/7
Allowables for 7075-T6 per WW-T-700/7
(OP)
Does anyone know of published A-basis allowables for 7075-T6 per WW-T-700/7 ? This material is not listed in the AR-MMPDS-01 (MIL-HDBK-5J).
A vendor has made parts from the above material instead of 7075-T6511 per QQ-A-200/11 as required. Because of lead time issues, we have been asked to approve the alternate material. I have only been able to obtain the mill's certification sheet which doesn't rise to the level of A-basis.
Brent
A vendor has made parts from the above material instead of 7075-T6511 per QQ-A-200/11 as required. Because of lead time issues, we have been asked to approve the alternate material. I have only been able to obtain the mill's certification sheet which doesn't rise to the level of A-basis.
Brent





RE: Allowables for 7075-T6 per WW-T-700/7
what form is the material?? the WW spec is a drawn tubing if im correct.
Do you have "S" basis from the vendor?
RE: Allowables for 7075-T6 per WW-T-700/7
I have material properties in a generic handbook, but they are not labeled A- or B- or even S-basis.
My understanding of FAR 25.613 is that I need A-basis allowables, or that I have to conduct testing to ascertain the allowables for my "premium selection", which I don't want to do because of time constraints. I'm told by the material supplier that this material is a better material than is required by our drawing.
I did contact the people who compile and publish the MMPDS, and I was told that there is no table for this material in MMPDS-03, which I don't have.
Brent
RE: Allowables for 7075-T6 per WW-T-700/7
Tried and failed to upload the snapshot with the data, let me know your email address and i will send the sheet to you. You might need to ROT13 your address becasue eng-tips dont like them appearing un-scambled.
E=10.4e6
Ftu = 77KSI
Fty = 66KSI
Care with T6 materials needs to be taken as they are susceptable to stress corrosion cracking. Will continue to look in other sources.
RE: Allowables for 7075-T6 per WW-T-700/7
ori@cnk2pnetb.pbz
(ROT13)
My application is not fatigue critical, so stress corrosion cracking is not a concern.
Thanks.
Brent
RE: Allowables for 7075-T6 per WW-T-700/7