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Hi, I'm new to designing with rubber materials and I'm trying to get a better basic understanding, or directions to good further reading that would assist in this field. As an application example, I wonder whether anyone could shed some light on the following: A metallic light post is fitted...

So, assuming I do as much as I can up front to reduce this problem: i.e.: Select a Ti6AL4V ELI (Gr.23) material. Forge and then finish machined to the required stud geometry (with generous radii in thread roots and under head). Vacuum anneal / beta process it to have Hydrogen <60ppm and improve...

Thanks all. To further explain the problem I'll simplify the description slightly. Assume we have a rubber band with one end rigidly anchored to the ground. The other end of the rubber band is rigidly attached to one end of a threaded stud. The other end of the threaded stud passes through a...

Hi, Just wondering if anyone knows of other suitable bolt / nut loosening tests or verification in common usage for a 'static' bolt joint without vibration or shock loads. I have read and witnessed a test on the Junker machine and heard of the NAS test methods, but I'm not really sure they fit...

Hi guys, thanks for the responses - I'll pick up on some of the references you've dropped in. The fastener prototype consists of a single STUB ACME threaded bolt running into a corresponding nut. All metallic components are currently of the same material, and the intention is to keep this...

Hi Cory, thanks for your reply. Do you have any case examples/past knowledge of what sort of reductions to allowable yield stress, I might apply to aid prevention of the SLC problem? Lee

Hi all, hope somebody can give some good pointers. We are looking to use a Titanium Gr.5 (Ti6AL4V)fastener bolt within our assembly that will be in continuous load for >20years (subsea app). I can see that this material suffers from SLC by predominantly the H2 content coupled with temperatures...

Hello, We have a coupling where a hub is fitted fairly tightly over a shaft and pinned using a straight dowel pin. The coupling is required to transfer torsional and slight axial forces. Using Roarks table 17.1, paragraph 18 our proposed pin solution is greater than the 0.4 ratio (0.436) on...

Thanks for your reply israelkk. Yes, I do understand your solution - you described it very well. I had actually sketched up something very similar to your description, but rather than using a "square" gland profile, I made the lower plate with a large 45 degree chamfer around the upper outside...

Hello, I have an aluminium extruded tube that is 150mm ID. The diameter tolerance is +0.7mm / - 1.3mm. This is a stock component used in our standard product and cannot be modified. For some prototype testing, we want to seal a new filter cartridge into this tube, sealed on the internal...

Hello all. Does anyone know what the sealing mechanism involves in sealing the two opposing flow areas from one another in continually rotating devices - similar to these: http://www.bryair.com/dessi_dehumidifiers/ffb.htm I have a similar sort of problem where I need to seal against the...

Sorry, missed quantity! Initial prototype stage could be upwards of 100 tubes maximum. Full production could well be in the 1000's possibly even into the 10,000's. Regards, Lee

Hello Pat, thanks for your response. We're completely at the concept stage at the moment, and hence fully defined specification is still not quite there. > The length our R&D guys are asking to test with is around 400mm. > The wall section will need to be sufficient to withstand the pressures...

Hello, I wonder if any of you guys can help point me in the right direction. I'm looking for a material with the following parameters: > ~2" Diameter Tube > Excellent Chemical Resistance > Low density > Electrical Insulator > 200 Deg. C Service Temp for <15mins > 1 Bar.G internal pressure >...

Hi Hora, Thanks for your response. The item only has 1 small straight section at either end, with the rest of the hose being one long continuous curve bent in many different directions and bend radii - I don't know how to create points at the direction changes...... Regards, Lee

Hello, I've been given a STEP file of a flexible hose by our supplier - its purely the solid model portion, and has no datum axis or curves. Is there a way in Pro/E WF2 to reverse engineer the component to discover the total end-to-end length, bearing in mind its bent in various different...

Thanks zcp. I was reading my emails in reverse this morning and noted desertfox reply but not yours. I am now looking into breaking the assembly down with FBD. Once I can get the load on each bracket, then we are going to run the FEA on those brackets..... I may be back with more questions...

Hi desertfox. Thanks for your reply. The 6 AV mounts are all the same specification. I did not supply enough information in the first post. The force is transmitted through all three major axis - i.e from below, and from both sides. It seems that the top brackets are fracturing when the...

Any more thoughts guys?? Regards, Lee

Thanks 40818. During Shock and Vibration testing, the corners of the AV mounting plate shear off during the 30g Shock test. The shock test followed the vibration testing. Looking at the crack propagation, you can see some fatigue markings through about 1/3 - 1/2 thickness of the plate before...