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Thanks for the replies! The profile tolerance makes sense. The location and orientation of the smaller radius is important to A and B and the larger radius should be located and oriented to C. How best would I control the top surface (how deep the radius is)… a profile on the top surface? Or...

Is it correct to dimension an edge from a radius with a position tolerance on it? I want to control this edge as it sandwiches a cylindrical part. See attached photo. Thanks.https://files.engineering.com/getfile.aspx?folder=e78422e2-980b-4134-b0a6-39f7321855ec&file=GDT_Question.JPG

Hi, I am trying to determine the load at which a weld will shear. Basically a solid metal disk is pressed into a tube and then they are laser welded together through the tube (weld penetrates into disk). My question is, can you use T = F/A where T = 0.75 UTS to ball park a load? is the...

Hi, I am trying to determine the load at which a weld will shear. Basically a solid metal disk is pressed into a tube and then they are laser welded together through the tube (weld penetrates into disk). My question is, can you use T = F/A where T = 0.75 UTS to ball park a load? is the equation...

Thanks for the reply FEA way! This is a one time use device that is exposed to a large force and then disposed of, so fatigue wont be an issue. If the joint was not welded but the part say machined as a single component...how would you ball park separation of material? I have attached a...

Hi, I have a design where a can is welded inside of a tube. Failure of the device would entail the can separating from the tube. If you were looking to predict or have some criteria to denote this type of failure what would it be eg. any elements that reach the ultimate tensile strength of the...

A part that is loaded/unloaded once and then discarded.

When calculating the max shear and bending stress in a beam using Sigma b = My/I and Tau = VQ/It, will the calculated stress be accurate past the yield stress for say a ductile steel or since the stress is distributed across more elements as it yields will the elements over yield experience less...

When using the normal stress equation sigma = F/A can this value be compared to the UTS or is this only valid in the elastic region? Thanks

the stopping distance would be accounted for by the deflection in the elastic case correct?

Hi all, What is the best way to determine the force/subsequent stress from an impact load. I have a project where a piston rams into/is retained by a housing. The material is glass filled nylon (which is anisotropic making it more challenging) and does not have a large elastic region. Would I...

So from preliminary trials, we could not shear the strip. The piston is only short and as the material begins to bend it imposes a side load on the piston which causes it to move away from the lower shearing edge. This increases the clearance between the two shearing edges which results in the...

thanks rb1957! Sorry, my forces for scenario two are not lined up correctly. The second scenario would take the "inside edges and create a simply supported beam case. This in turn yields a higher shear force than scenario one. I have done some testing and the force to shear the strip is much...

Hi All! I'm designing for a strip of metal (b=11, h=1.48mm) to fail in shear. Its a pyro safety switch where a piston is forced to shear the strip and bend the flap of metal to create distance between the two pieces. I want to find the shear stress for a given force. I have attached an image of...

Thanks 3DDave. How would you determine the force due to impact as the distance the distance the work is dissipated over changes the force? Do you use a dynamic analysis or find a force and apply it in a static study?

Ted, Thanks for the reply. That is the exact document I have been using. I'm not sure which volume to use...Would it be the csa of the piston that contacts the housing multiplied by the distance? In the example the whole rod is axially loaded so the entire volume of the rod is used.

Hi all, I am analyzing a scenario where a part impacts another part and wanted to find the stresses induced in the material (see attached picture). From what I have gathered I should use conservation of energy where the kinetic energy of the moving piston is transferred to cause deformation of...

Has anyone seen a profile of a line tolerance applied to the edge radius of a washer? To me it seems overkill...why not just use a plain old radius dim? Are there any advantages to using a profile of a line like shown below, if so how would it be measured? The B datum is attached to the outer...

Hi all, What is the correct way of dimensioning a feature of size that is interrupted such as the height of the part below or chamfers/radii from a side view that are continuous. Eg. Would it be 4X CHAMFER or 8X CHAMFER (is it confusing/wrong to put 8X if only 4X are visible in view)/similarly...

Thanks 3DDave!