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  1. Aerodesign

    Pilots harness anchor point geometry

    Look at CS VLA Appendix A. AMC VLA 785 (e) Seats, Safety Belts and Harnesses (Acceptable Means of Compliance) That should help you.
  2. Aerodesign

    Ti-3ALv2.5 - stress strain TABLES1 for MATS1 material definition (20 deg C)

    ASTM Grade 9
  3. Aerodesign

    Ti-3ALv2.5 - stress strain TABLES1 for MATS1 material definition (20 deg C)

    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...
  4. Aerodesign

    COMPOSITE DAMAGE

    Suggest you speak to HKS. That is what the license support agreement is for.
  5. Aerodesign

    Reduction in Fbru for 7075-T6 Sheet as of MMPDS-05

    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...
  6. Aerodesign

    Tension Fitting (Angle and Channel) understrength mitigation

    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...
  7. Aerodesign

    Tension Fittings Filler Pads - Throat Pads - thread2-297984

    The BM methods are proprietary and hence copyright, l doubt if you will get a copy via a request on an open forum.
  8. Aerodesign

    FEA resources for Laminate Filled Hole Analysis

    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.
  9. Aerodesign

    Tension Fittings Filler Pads - Throat Pads - thread2-297984

    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...
  10. Aerodesign

    FEA Consuling Firm - HyperMesh

    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...
  11. Aerodesign

    Evaluating Landing Gears for Crashworthiness

    [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...
  12. Aerodesign

    Curved cantilever type beam (Cessna 150 Landing gear) Finite Element Calculations

    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...
  13. Aerodesign

    Curved cantilever type beam (Cessna 150 Landing gear) Finite Element Calculations

    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...
  14. Aerodesign

    Checking of calculations in the aircraft industry

    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...
  15. Aerodesign

    Need explainning about NACA 1-H-15

    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
  16. Aerodesign

    Unit conversion in Patran after FE Modelling

    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 >...
  17. Aerodesign

    Wing Box Design

    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...
  18. Aerodesign

    SHEAR-OUT/BURST-OUT IN COMPOSITE PANELS

    Try this nice method. http://files.engineering.com/getfile.aspx?folder=a6eec873-bd4f-4378-9304-c80169f5be3b&file=C8-1.jpg http://files.engineering.com/getfile.aspx?folder=41176c67-94ee-4ea9-a95d-468b8ae424a8&file=C8-2.jpg Regards
  19. Aerodesign

    Coupling Shell and Solid Elements

    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...
  20. Aerodesign

    Help on Stress Analysis Distance Learning Course

    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

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