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I have a theoretical question. Question: I have a hollow thin-walled cylinder. I put it in a press and plasticity deform it in the lateral direction. At this point, I have an oval shaped "cylinder." If I stress relieve this part - will the cylinder move towards its initial round shape? Or...

Can Mathcad be set up to do the following: Given: 1, 3, 4, and 6 use these four numbers using any of the standard math functions (+,-,/,*) and determine the expression that will equal 24. jackboot

Problem: Analyzing crank torque, load is applied for 1/2 rotation N:=360 i:=0..N thetai:=i thetari:= converts thetai to radians Now I need the following conditional statement for the compression stroke: ag(thetar):= 1 if pi>thetar>0 0 otherwise Po= Pp*ag(thetar) I get an error message that...

I graduated with a Mechanical Engineering Degree and obtained a PE. If someone knows the answer to this question please tell me: Why does it seem that everyone is making the same amount of money whether one is in engineering or in some other profession? Realize I love my profession, and I...

We are looking to buy some new graphics cards as my past experience with the Wildcat 7110 has left me a shell of my former self. Everything I can read - and a short time running Nvidia with SW - seems to point to this card. However, SW doesn't list the FX4400 on its website as been tested and...

I am about to try to qualify a weld overlay procedure to ASME section 9. Question: For the transverse bend tests - what should the width of the speciman be? That is when I saw the transverse specimens for the bend tests - how much do I offset the saw to make a specimen? jackboot

Question: Would concentrations of 15% HCL and/or 12:3% HCL:HF likely cause SCC or CFC? Given: 4300 series alloy steel 330 BHN (130 YS), ambient temperatures, cyclic loading with high stresses (localize areas). My initial guess is - yes. jackboot

Is there an expert on shot peening and its effects on: stress corrosion cracking, corrosion fatigue, and just pure mechanical fatigue. I have been to the www.shotpeener.com and combed their library- I got a lot of good information. However, I was wonder if anyone had any real experience with...

A customer asked a very simple question that has turned into a massive project. We make valves - all types. For the purposes here we have a safety valve or pressure relief valve. The question: How much can I flow through your valve for a given pressure drop? (for water at 60 F) So far...

Question: I am thinking of up-grading to TK Solver 5.0. However, I have always been interested in other packages- MathCAD for instance. I have to do design reports and TK has always done the job but the cut and paste headaches of putting the information into Word have always taken the fun out...

I am designing an aluminum connecting rod with FEA. What I have is the following: design life - 36,000,000 cycles 6061-t6 material with "fatigue endurance" 14,000 psi I know aluminum doesn't have a true endurance limit but I would like to design for 36,000,000 cycles. For fatigue...

Question: when rating equipment to temperature class x or y - I have the following questions. If one doesn't wish to qualify the material at the high temperature mechanicals. Can you use the derating the factors in Table G3? If you use these factors - are you calculating to the working...

I have searched this topic and I can't find the information. Question: Is there an upper concentration limit for the NACE MR0175? Example: I can see that for carbon steels Rc22 is the max hardness to operate in the SCC zone as depicted by MR0175. But the charts in MR0175 show a limited...

What is the formula to determine transverse backlash in helical gears? I have an old paper but I can't read it and I can't find the formula on the internet. So far I have: Bt=Bn/cos(pressure ang) However, I believe I am missing one other variable. jackboot

Is there a spec or a standard to spec out the manufacturing data for a set of helical gears? I can't find one and I can't anyone who knows. jackboot

Question: Is there a coating process where the equipment (to do the coating process) can be bought? Situation: We currently use a QPQ (Molten Salt Bath Nitriding) but we have to ship the parts to the processing plant. This type of equipment is approximately $500,000 and carries a good amount...

Questions: Would 17-4 (double aged H1150-NACE certified) be a suitable material in 7.5% HCL? Or would it be better than 4140 (NACE)in the same environment? For the same solution - would Aluminum-Nickel-Bronze be better than ductile cast iron (80-55-06)? Thanks, jackboot

Does anyone have any suggestions for speeding up Solidworks? I am running dual 3.06 Ghz processors, 7110 Wildcat Graphics card, 4 Gig of Ram, and I have a hugh hard drive. We have assembly's with complicated features and threads. Solidworks has always been slower than Pro (my experience only...

Question: How does one calculate the Cv value for a piece of equipment? I don't know if there is a standard for doing this - it would seem that the value would the meaningless if the flow changed from incompressible to compressible. Further, I can only run the simulation with a CFD package to...

We have a customer wanting a Stainless overlay to protect his equipment from HCl and HF. The operating temperature is 125 F and the concentration is 15% - for either of the two or as a combination total. Would 316L be suitable for this? jackboot