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I'm applying a remote compressive displacement to a plate that sits on top of a rubber spring (z-axis). At the moment I've constrained the x and y displacement to zero - which is not representative. Nor is allowing the plate to move freely in the x and y direction. How do I allow the plate to...

Thanks Zekeman As you suggest, I'm using the energy exchange approach for the PCB falling parallel to the ground. The way the PCB is fixed to the enclosure it has a different spring rate depending on whether it falls face-up or face-down. Despite the limitations, I felt it would provide a...

That's exactly it rb1957 ... I'm trying to calculate the equivalent force on impact for a PCB in an electronic device dropped from a height onto concrete. I'm using the expression: Fe = SQRT(2 x U x k), where U = kinetic energy and k = the spring rate of the PCB. I did not want to make...

I'm trying to calculate the equivalent force on impact. Using the conservation of energy approach - the Physics based text books I've consulted suggest Force (Fe) x displacement (d) = kinetic energy (KE). However, the engineering texts suggest the relationship is: Fe x d = 2 x KE. Am I...

Thanks for the suggestion Ibell. We have followed your advice.

Hi tnatale The plated metal forms the chassis of an electronic component. The component must comply with MIL-STD 810G method 509.5 (salt fog). We specify a temperature range of -30 to +60 Deg.C. We have access to the tools and equipment typically found in a mechanical test lab. We have...

We would like to change our plating supplier. The components are mild steel and receive a zinc plate and passivate. The potential new supplier uses a different process to the current supplier - although we are assured the parts will have the same level of corrosion protection. Is there a...

I'm currently researching methods to encapsulate electronic components to meet ATEX approval. I'm keen to understand what materials are typically used for this application and the type of processing techniques employed. I would be particularly interested to hear from anyone who has used low...

Hi We have observed 'blackspot' contamination on a nickel-silver alloy (see images in attached spreadsheet). We are assured by our suppliers that the contamination cannot be easily removed by solvent and/or abrasion. Our supplier has also informed us that the contamination was present on...

Can anyone suggest a useful source of information (text book, web article, etc) that explains the cause of "knit lines" in rubber mouldings - with particular reference to nitrile...

There is a case for torsion of an I-section in Roark's formulas (Table 20, No. 26). However, the formula requires the following information: "a positive angle through which a tangent to the boundary rotates in turning or travelling around the reentrant portion". How do I determine...

Does anyone know where I can find information on the ultrasonic vulcanisation of rubber-to-metal bonded components?