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  1. Darkmann

    FEMAP contact

    I have used glued contacts successfully for components which actually mate with zero gap, functionally. You do have a gap but it is not clear to me whether or not that is intentional. If functionally you do not need a gap, play with the Glued Contact Property (BGSET) option on the FEMAP Define...
  2. Darkmann

    Need Help Modeling Belleville Washer in FEMAP

    That's what I thought. I'll dig into this some more. Thanks Joe.
  3. Darkmann

    Need Help Modeling Belleville Washer in FEMAP

    Update Joe. In initially the run failed but after I put in an initial value for stiffness in the DOF Spring stiffness window, it ran. Unfortunately the results are not what I expected, and I can fix that later. My question is this: I do not believe I have the non-linear FEMAP module (I'm...
  4. Darkmann

    Need Help Modeling Belleville Washer in FEMAP

    Thanks Joe. I don't like DOF Springs and always use CBUSH. I didn't see any way to input my load/displacement function. Thanks for giving me a lead.
  5. Darkmann

    Need Help Modeling Belleville Washer in FEMAP

    It looks like the only option I have is to use DOF Springs. I created a dimensionless load vs displacement function and applied to the DOF Spring. Then between End A and End B, I apply 3 of these DOF Spring elements, each representing stiffness in the three coordinate directions. Is this the...
  6. Darkmann

    Shock Response Analysis

    I have a time history for a system that was subjected to some kind of shock load. The data was acquired using a triaxial accelerometer. The problem is to use this data and predict the magnitude of the input shock. Shock spectrum analysis has been suggested but I doubt that'll tell me what I...
  7. Darkmann

    Parachute -forces

    Interesting question. Incidentally I had the same question as of last year. We have started rigging flight systems with accelerometer to gage the system response as the parachute deploys. The time domain data is quite interesting. The problem I have at the moment is how to analyze the data...
  8. Darkmann

    How do I Determine Input G-Loading Given Accelerometer Shock Response

    I have shock response data (time) from a triaxial accelerometer. The task is to determine the shock load that the structure sees, using this response. I have the sampling rate and acelerometer specs. How do I begin to answer this question. I can reasonable assume that the system is a 1DOF...
  9. Darkmann

    Effect of Externally Applied Loads on Bolt Preload

    I'm new at joint design and have a question about bolt preload. The FEA model of the fastener is a simple 2-noded bar from which I extract axial loads and bending moments. I then apply these loads to a known fastener to characterize its strength. Here's my question: is the effective tension...

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