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  • Users: cbk14
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  1. cbk14

    No boundary conditions listed in PSD G Accel load in Random Vib (Ansys Mechanical)

    I'm having a strange issue where I can't select any boundary condition for my PSD G acceleration load in a random vibration study. I have the prerequisite modal analysis linked properly, with fixed boundary conditions defined therein, but the PSD G acceleration definition doesn't list them, nor...
  2. cbk14

    Is it reasonable to average von Mises stress plots at discontinuities?

    Suppose I have a FEM with two bodies. One body represents the washer underneath a bolt head; it is circular and small relative to the other body, which is a large, thick, flat plate. The washer is bonded to the plate in a circular region with compatible meshes. The edge of the bonded contact is...
  3. cbk14

    Circuit Card Strength

    Hi all, I have tasks to analyze some mechanical assemblies which include circuit cards (PCB / PCA / CCA whichever terminology you prefer) under particular load conditions. For the purposes of this discussion, let's stick with common FR-4. What are the recommended best practices for mechanical...
  4. cbk14

    Studs sheared and magnetic particles found

    Hello all, A friend of mine had two (out of twenty) OEM wheel studs shear off. One sheared while installing wheels and the other sheared while taking the wheels off (about a week later). Both stud failures occurred while tightening or loosening the lug nuts (also OEM). Being curious, I...
  5. cbk14

    ASME Membership Perks?

    Hi everyone, I'm looking at becoming an ASME member, but I want to make sure I understand what's offered before I drop the quid. I basically just want access to the ASME journals with no per-article fees or anything. As an ASME member, is that possible? Or do you still have to buy articles even...
  6. cbk14

    Vibration of a Retaining Ring / E-Clip

    I am working a design that has jack screws - basically a grooved screw with an E-clip retaining ring for captive purposes. The design will undergo pyro shock and random vibe, so there is some worry that the E-clip will vibrate out of the groove on the screw. Has anyone experienced E-clips...
  7. cbk14

    Thermal analysis of a PCA

    Hi all, I'm trying to conduct a thermal analysis of an FPGA on a PCA. According to the data sheet the FPGA can be roughly modeled as a two-resistor network, with one resistor being the IC-junction to case thermal resistance and the other resistor being the IC-junction to board thermal...
  8. cbk14

    Thermal Analysis of a PCA

    Hi all, I'm trying to conduct a thermal analysis of an FPGA on a PCA. According to the data sheet the FPGA can be roughly modeled as a two-resistor network, with one resistor being the IC-junction to case thermal resistance and the other resistor being the IC-junction to board thermal...

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