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  • Users: illini8181
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  1. illini8181

    Constant curvature and constant twist patch tests

    I am trying to understand the details of how a constant curvature and a constant twist patch test are applied, and what the desired results are. Doing some internet browsing, I found the linked book, which has an example of a constant curvature test and a constant twist test...
  2. illini8181

    Shell element degrees of freedom?

    Is it generally true that shell elements typically only have 3 DOF per node (rotation about x, rotation about y, transverse displacement) for bending applications, but can have 5 DOF per node (addition of displacement in x and y directions) if they are being used for both bending and membrane...
  3. illini8181

    GD&T Reference Book

    I work for a company which uses GD&T widely, but provides no GD&T training. I would like to do some learning on my own. Are there any books/resources that anyone would recommend for someone with a beginner/intermediate knowledge of GD&T? I of course have a copy of the standard and read...
  4. illini8181

    Padeye baseplate calculation

    I am trying to do a very quick calculation of the stresses in a 1 inch thick plate with two padeyes (see the attachment). I am not worried about the padeyes themselves, the welds, or the bolts, just the plate. My assumption is that the highest stresses will be in the region I point out. I...
  5. illini8181

    Non-metallic hole plug

    I have a 1.5 inch through hole (not tapped) in a 1.5 inch thick painted steel plate that I need to plug. The plug must be able to be installed under water. The plug must cover the hole from both sides, but does not have to be water tight. It is preferred that the plug be a non-metallic...
  6. illini8181

    ASME BTH 1-2011

    I am new to ASME BTH 1-2011. I am trying to understand where some of the equations come from. One in particular is confusing me right now. Section 3-3.2, Bolted Connections, states "The allowable tensile stress, Ft', for a bolt subjected to combined tension and shear stress is Ft' =...
  7. illini8181

    Statics problem

    Basic statics question: If I have an object hanging cantilevered from an I-beam, how do I find the bending stress part way up the I-beam (see attached sketch)? I know that my basic equation will be sigma = Mc/I. The moment at the lower end of the beam, M’ = W*L, but I cannot just move this...
  8. illini8181

    Total runout

    I have a question about total runout. My understanding is that total runout controls form, orientation and location, but not size. However, Section 9.4.2.1 of ASME Y14.5-2009 states that "Where applied to surfaces, constructed around a datum axis, total runout may be used ot control cumulative...
  9. illini8181

    Should this dimension be boxed?

    If you have a part with two parallel surfaces which are controlled with GD&T (flatness and parallelism), should the dimension defining the distance between them be boxed? Or, is this optional? I am looking at two drawings put out by my company. In this scenario, one of them boxes this...
  10. illini8181

    Gage to inspect position of countersink relative to thru hole?

    I am reviewing a design of a plate which bolts to a larger structure using countersunk flatheads into tapped holes. I recognize that this is a fixed/fixed scenario, and so if the tapped hole and countersink are not perfectly aligned, the stress on the fastener head will be uneven (See...
  11. illini8181

    Terminology question - threaded boss

    This is a terminology question. See attached. This is a threaded piece with a rounded upper surface which can be threaded in and out of the plate shown. The plate is the base of a larger structure. There are four of these threaded pieces, which allow the angle of the base to be slightly...
  12. illini8181

    Bolt bending

    I am designing a bolted connection (see attached) which consists of a steel structure bolted to a large, gently curved steel plate via two steel flanges. In between each of the two flanges and the curved plate is a very hard plastic shim. These are very, very large structures, and so the...
  13. illini8181

    Basic Friction Joint

    I am trying to understand how a bolted connection I am designing behaves. The connection is attached (Figure 1). There are actually four steel “feet” which are bolted to a large steel plate (only one foot is shown) with four bolts per foot. Specifically, I am trying to understand at what...
  14. illini8181

    Understanding ASME Y14.43

    Hello, I am working on the design of a gage. This is the first time I have designed a gage, and it seems as though there is no one in my company who is knowledgeable about doing so. I have read through ASME Y14.43 several times. Each time I read it, it becomes clearer. I have a fundamental...

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