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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...

Thanks ukbridge, you are right. I was confusing the two.

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...

Wow 3DDave, your post is very insightful! "It is difficult, because the number of worked examples is limited and the majority of examples will be for configurations that are carefully constructed to work correctly, which does nothing to teach how these configurations came about." - so true! My...

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...

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...

ornerynorsk - similar to what you suggested, I am considering machining shallow grooves in the hole to hold a plug with an O-ring in place. I would rather not have to do any machining, but this would allow a simple plug to be used and would make underwater installation very easy.

btrueblood - the hole is in a rotating part, so the plugs are intended to prevent cavitation erosion. I have looked through the plugs on sites similar to caplugs.com. I cannot picture what you mean by installing a vinyl cap inverted. What keeps it in place? Just friction? ornerynorsk -...

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...

Thanks for the response JStephen.

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' =...

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...

Thanks for the help everyone. I am running into an issue where everyone in my group is interpreting a total runout tolerance on a taper as a profile. I am convinced that the size of the taper is separately controlled by two toleranced diameters (looser than the runout). However, everyone in...

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...

Thanks for the clear and helpful responses.

Oops, forgot the attachment.http://files.engineering.com/getfile.aspx?folder=3f136f9a-7de0-4faf-a90e-77919de57f3a&file=Example_part_-_should_dim_be_boxed.pdf

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...

Mike, thanks for the commonsense advice! I'll do that.

Powerhound - I agree that the location of the countersink to the thru hole is non-functional. However, the tapped hole is drilled based on the location of the thru hole. Once the cover holes/countersinks are drilled on the fixture, the cover is placed on the part. The centers of the thru holes...

powerhound - you are correct in assuming that the countersink carries the stress. I agree that the design is flawed. I would like to change it. However, there is resistance because "this is what we've always done". If I am not able to change it, I would like to be able to inspect the...