I am working on a landing gear design/stress which is using T1-3ALv2.5 tubing. Linear static analysis indicates higher than yield stresses in various places. I have refined the model to enable believable stresses to be recovered (FE is mixed 1d, 2d and 3d elements) and now need to define the...
Hi Superstress,
I'm afraid l don't know the reason for the reduction, l suspect it may be due to a reappraisal of the test data submitted which derived the MIL-HDBK-5xx values.
Look at the presentation here...
This is a question for aero stress engineers.
We have a few locations showing negative MS where an external load (modification) is attached to a fuselage through the skin into a new reinforced channel or angle type fitting. The stack-up of parts on the fuselage side consists of skin double...
Did anyone mention ISAMI?
40,000 flight cases, 12 thermal flight cases, 3 material conditions, about 15 failure modes, at least 3 loops of load = 25 TB of results data.
Stress engineers become data controllers.
Welcome to the new world.
Some good work on this thread by edbgtr in 2011, thank you.
I am trying to use the calc method for a filler pad on angle and channel tension fittings which have been manufactured undersized. Hence they need throat pads applied - currently tentatively sized based on a nominal efficiency factor...
Hi Farhnaz000,
Been using it since 1994 when it was introduced into the UK. Hyperworks suite is a top end product which has 'stolen' (don't sue me!) the market from under other software companies feet. I started a consultancy specialising in cost-effective engineering analysis in 1988, this...
[b]SwimBikeRun4342,
Your question surely relates to a compliance issue with regard to the chosen regulations for the plane? Example: Crashworthiness in CS-23 relates to 23.721 where the gear may be overloaded and will need to break away. This then requires that the tanks are protected...
Hi Greg,
I am a little unclear on why a hand calc approach is being contemplated, you asked for FEA calcs. I assume this is being done for work and not academic reasons? A piecewise curved beam of variable cross section under quasi-static or dynamic loading is a tough nut to crack by hand...
Hi Greg,
I have done a fair amount of stress work (inc FE) on light aircraft landing gear. The steel leaf of the C150 is a very straight forward design using conventional materials and attachments - hence it is possible to get very accurate correlation between a decent FE model and a full scale...
Hello,
I could have written your (edbgtr) piece myself such are the similarities. I have been working at a EU/NL based firm for some years as a consultant trying to get the stress methods and analysis into line with a major customer (who assemble a/c in Toulouse). Much of the customer's methods...
Hi 12alpha,
The analysis can be done using a web tool:
http://www.worldofkrauss.com/foils/search?contains=naca+1-H-15
Attached is the solution and answers
Regards
JWhttp://files.engineering.com/getfile.aspx?folder=a9c6b59a-36f7-4c80-a8e6-5d619b4ab278&file=NACA_1-H-15.jpg
Patran has no internal units! It reads data and you assign units to suit yourself. What does happen though, and this may be your issue - when reading in external IGES, CATIA (any CAD) data there is a parameter that tells Patran what unit it was created in. You need to ensure that in IMPORT >...
Admiral007,
Is it a surface skimmer - like the Russians make? Or the version to go to Mars?
Your client sounds like a nightmare - if you are being paid as a consultant to validate 'a design' then the approach you should take is to question the root assumtions and the entire concept to...
Hi DaDn,
The simplest way to ensure that you have a fully connected mesh is to generate the shells directly from the solids (or visa versa. If you are using Patran this is possible (but a bit fiddly), if you have Hypermesh it is instant.
We use this method all the time, usually by making a...
rb1957
Here it is:
Bruhn Errata Copyright, 2008, by GRAN Corporation. Printed in the United States of America. All rights reserved. ISBN 978-0-9816076-0-3 ISBN 0-9816076-0-8 GRAN Corporation Whitney, Texas
Bill is also on linkedIn.
Regards
John
