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Recent content by bsdhr

  1. bsdhr

    Linear motor Vs. Brush and Brushless DC motor

    Go to Kollmorgen website and you should be able to obtian this info for Brush versus Brushless. Brushless DC (BLDC) motors are preffered when you require long life and high torque. Brush motors are simpler to develop and control, so good for prototyping.
  2. bsdhr

    Modeling hardness variation in core developed steel via FEA

    Ed. R; You are right, simple test are requried for correlation. I am planning to conduct simple pull-test made from specimen material. This approach should be satisfactory to evaluate strength of the part. For fatigue, unless we make another sample and run it thru life testing, the above...
  3. bsdhr

    Modeling hardness variation in core developed steel via FEA

    Folks; We have a situation in our hands, whereby a batch of parts have been processed that have incorrect metallurgical properties. And it is my attempt to use FEA to model this discrepancy. The part is a hollow tube, machined from a solid bar of stainless steel. As part of manufacturing...
  4. bsdhr

    Composite tubing material properties

    Good morning folks! With all the help I am getting on this thread, I personally feel bad for not sharing with you the application and part usage on plane. But you have to forgive me on this, the simplicity of the application would allow anyone to comprehend the idea and leap-frog my employer in...
  5. bsdhr

    Composite tubing material properties

    Hansmeister; I am glad you came across my thread and shared your valuable expereience. I did hand calculations and based on fixed OD of 1.125 in, for an ID of 0.125in (say) I get 25 Ksi of normal (axially directed) stress and 7 Ksi shear stress when a combined limit load ( axially compressive)...
  6. bsdhr

    Composite tubing material properties

    RPstress: The material is pre AMS 5898.
  7. bsdhr

    Composite tubing material properties

    G'morning folks! It was pleasing to see my in-box crowded by your valuable replies. Thanks for your comments and I will attempt to respond individually to you as below; GBor: Thanks for the link. I am refering to "Principles of Composite Material Mechanics" by Ronald F. Gibson. Took his...
  8. bsdhr

    Composite tubing material properties

    Thanks SWComposites.I will try to answere as much as possible. What is the function of the part? The part acts a cantilever beam. Sorry, I cannot tell you exact part name or application. So I will restrain to physics of the part in description. What is the cert basis: primary, secondary...
  9. bsdhr

    Composite tubing material properties

    Hello Everyone; I am putting together weight saving proposition for upcoming Boeing 787 part. The intended design is all Stainless Steel and the proposed design would be combination of Steel and Composite material. We are currently the selected supplier for this part and hence have all...
  10. bsdhr

    Aerospace Grade Cable

    Hi! I am searching for a cable that is 1 inch long and used to transfer no more than 1W power between the ends. The application is for aerospace and hence requires high reliability besides being exposed to continouse vibration . The cable is on plane fuselage, protected mechanically by housing...
  11. bsdhr

    Thru hardening sheet metal

    Thanks Goahead! Yes you are right, I intend to form this long plate into 'C' Cross section prior to heat treating. The overall width and heigth ( of 'C' X-Section)is very small in comparison to the length. I am sorry, the application is confidential at this moment. Material being considered is...
  12. bsdhr

    Thru hardening sheet metal

    Hi! My challange at hand is to heat treat (thru harden) a simple geometry made from 0.050 inch thick sheet metal that runs min 24 inches long. Gas Carburizing or furnance heat treatment is prefered due cost. The concern I heard is distortion, wraping etc. if the part is just laid in the...
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