Asked to size up a repair for a Grob sailplane. Component I need to replace is fabricated from DIN 1.7734.4 seamless tubing.
Anyone got info on that specification? Ideal solution is to find a compatible AISI tubing to effect the repair.
Thanks
Joe
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Great Spirits have always encountered...
In the past, when I've resigned, it's been driven by things like severe reduction in health care, or just normal career growth move.
While it is a career growth move in this case, the main reason I was even looking is because these guys didn't seem to know what to do with me. I sucked it up...
I recently came across a fairly astute observation about this paradigm where management is offered as a "reward" to engineers who have longevity and have performed well. The observation being that management is a skill set in and of itself and meerly being a good engineer - or even a great...
Am in the process of learning Patran at my latest gig. Unfortunatly, these guys aren't likely to spring for any training and the most I can hope to learn by asking questions is just enough to "get by". I'd like to be considerably more knowledgable than just the bare minimum required. However...
Anybody have temperature knockdown curves I can use for NAS1097AD rivets installed in a high temperature environment (450+ degrees F)?
Previous data where I'm at right now suggest they were only looking at the skin bearing strength.
Thanks in advance,
Joe
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Great Spirits have always...
I just recently switched to working for a subsidiary of a "mega-corporation" which I'll keep un-named. Anyway, I'm really struggling to find my niche here. There just seems to be so much bureocracy, politics, and general "catty-ness" that it's difficult to actually get anything done. It...
Trying to come up to speed on Patran. I used Cosmos/M some years ago and I remember that you could "PUSH" nodes to a nearby surface.
Is there something equivalent to that in Patran? I'm trying to find a way to easily create groupings of nodes for applying loads and boundary conditions without...
I'm in the middle of evaluating a structural modification to install some extended first and business class seating to a Boeing 747 (upper and lower deck). We are, of course, working conservatively but I'd prefer not to make unnecessary mods to primary structure.
I ran across some floor beam...
This material is now depreciated - replaced by 7055-T76511 I believe. Anyway, working with a legacy installation and need to find those material properties. I understand it's in older versions of MIL-HDBK-5.
Anyone got data for this?
Thanks,
Joe
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Joseph K. Mooney
FAA DER Structures
I currently work for a small engineering consulting firm that specializes in large commercial aircraft. It's a great working environment and I enjoy a tremendous amount of autonomy working for them. However, small companies are limited in the type of benefits they can offer. I now have a...
Lately, I've been playing around with trying to develop a computational method to solve arbitrary doubler installations. In the course of investigating this, I've found myself questioning a very common method that is typically used to verify static strength of the fasteners that attach the...
Specifically:
AFFDL-TM-71-1-FBR "A Crack Growth Retardation Model Using an Effective Stress Concept", 1971
by Willenborg, Engle, and Wood.
Anybody know if it's out there in internet-land or available for purchase?
Thanks,
Joe
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Joseph K. Mooney
Director, Airframe Structures - FAA DER...
I had posted this before in answer to someone's question but I see the question was removed. I did get some feedback that it was useful so I'll re-post the link as info:
http://afmat.wpafb.af.mil/index.php
I've gotten a few useful references from this forum in the short time I've been part of...
