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Recent content by mcclain

  1. mcclain

    U.S. Senate Minority Report Questions for Critical Thinking

    davefitz, You observations would be consistent with the realization that Al Gore's "An Inconvenient Truth" was simply an infomercial for his carbon offset business in Europe. I think he made about $180 mil.
  2. mcclain

    Vibration mode(s)?

    You should move this question to "Mechanical Acoustics/Vibration engineering". They live for this stuff.
  3. mcclain

    FE Text For Begginers

    I'm partial to Building Better Products with Finite Element Analysis by Adams and Askenazi. Pub: OnWard Press
  4. mcclain

    Evaluating existing 14-Bolt Moment Connection

    http://www.fgg.uni-lj.si/kmk/esdep/master/wg11/toc.htm should show how to analyse this connection if you choose to go that way. Note that the highest loaded bolt pair in tension will be the pair at H1, given the general thicknesses indicated (see Figure 15 in the introduction section of Lecture...
  5. mcclain

    Tighten Bolts Beyond Yield to Almost Break Point/A Better Factor of Safety than ASME VIII 1 App 2?

    Keep in mind that the "apparent" tensile strength of a bolt is considerably less due to the added torsional stress during torqueing, i.e., torqued tension vs. direct tension. See KulaK, Guide to Design Criteria for Bolted and Rivets, AISC 2001.
  6. mcclain

    Books of Basic of Pressure Vessel Design and Process

    I meant, Are there any text books devoted to finite element analysis of pressure vessels?
  7. mcclain

    Books of Basic of Pressure Vessel Design and Process

    Are there any test books devoted to finite element analysis of pressure vessels?
  8. mcclain

    Thread Loading

    After you calculate your length of thread engagement required for thread shear strength (I recommend FED-STD-H28) be sure and add in allowances for tolerances and chamfers, etc. Your design length of engagement may be as much as 150% or more of the required length of engagement. Good luck, Mark
  9. mcclain

    increase in carbon/epoxy modulus with hot/wet?

    Could there have been some post curing during the wet conditioning?
  10. mcclain

    Shore A from stress-strain data

    Gent, Engineering with Rubber, indicates an empirical relationship between Shore hardness and initial Young's modulus.
  11. mcclain

    ESTIMATION OF NON-LINEAR STRESS FROM LINEAR ANALYSIS

    The method you are using is applicable in situations whereby your stress is a "secondary stress". Per ASME "secondary stress: a normal stress or shear stress developed by the constraint of adjacent material or by self-constraint of the structure. Its basic characteristic is that it is...
  12. mcclain

    Nonlinear analysis of stress concentrations in creep realm

    "so my stress concentrations after the nonlinear analysis are lower than the yield but are higher than the allowable" Are the stress allowables applicable for stress results from an elastic - plastic analysis? Regarding stress concentrations, remember that with an elastic plastic analysis...
  13. mcclain

    What came after moment distribution method?

    You could program the direct stiffness method as described in Dawson, T.H., Offshore Structural Engineering, Prentice-Hall, Inc. 1983.
  14. mcclain

    1.15 Fitting Factor

    According to Peery, D.J., Aircraft Structures, McGraw - Hill, 1959: "Many uncertainties exist concerning the stress distribution in fittings. Manufacturing tolerances are such that bolts never fit the holes perfectly, and small variations in dimentions may affect the stress distribution. An...
  15. mcclain

    Plate buckling via linear FEM solution

    Should the buckling point be the minimum of the sencond derivative, i.e., the point with the sharpest downward concavity on the load shortining curve?
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