×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Bearing Stresses and Surface Loads of Magnesium Alloy AZ92A

Bearing Stresses and Surface Loads of Magnesium Alloy AZ92A

Bearing Stresses and Surface Loads of Magnesium Alloy AZ92A

(OP)
I am not sure as to how to explain what I am looking for but I will attempt to give it a good try.

We are presently in the process of designing a housing which will be cast from Magnesium alloy AZ92A.  In reviewing the requirements of FAR Part 25 Section 25.621 Casting Factors.  The casting that is being designed is not thought to be a critical casting.  It serves as a housing for rotating components that supply air to the cabin and cockpit.  The housing is attached to a support sturcture in the airframe.  The only surface loading would be from the result of torwuing froces applied by the attaching hardware, which would be compression on the housing and the support structures. Any help in clarification of the issue would be greatly appreciated.

RE: Bearing Stresses and Surface Loads of Magnesium Alloy AZ92A

It sounds to me that you would use the appropriate casting factor for non-critical castings, with the specific value dependent upon the items described in Section 25.621.  Neither MMPDS nor MIL-HDBK-5 list bearing properties for Mg castings, but there is some data available from other references like "Magnesium Product Design" by R.S. Busk.  The ASMH may also have this data, but my copy is at home.

RE: Bearing Stresses and Surface Loads of Magnesium Alloy AZ92A

KHI... Briefly...

If You have a part that is this lightly loaded, why not make from molded heat/weather resistant glass-fiber reinforced plastic, such as fiberglass filled nylon 6/6 [ASTM D4066]... epoxy-fiberglass mat?

Otherwise suggest You make from AZ92A-T4 or -T6 per ASTM B80; except meet requirements of AMS2175 Class C Grade C or (if feasible) Class D Grade C [I rarely recommend Grade D].

FYI MIL-HDBK-5 [basic, Aug 1962] has complete mechanical properties for AZ92A sand and permanent mold castings per QQ-M-56 [trick is trying to determine what quality level the casting samples were maded equivalent to].

Regards, Wil Taylor

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources