Recent content by crobb

Offshore cranes are typically certified by DNV; a good place to start might be to look for relevant codes of practice https://exchange.dnv.com/publishing/ServiceDocs.asp This should help out with calculating relative crane tip velocity etc. Have you considered the application of strain gauges...

Why don't you ask the supplier what standard their steel conforms with? If they aren't producing it to a standard or buying it from a forge that does and they can't provide Quality Assurance documentation then its probably not worth buying. BS 2HC 101:1989 is a British Standard for...

For small scale turbines you can use a Furling tail. It's designed so that at a critical wind speed the wind force on the tail exceeds its weight and lifts it upwards. This results in the turbine turning perpendicular to wind direction. This is sensor-less but it when it turns out of the...

For small scale turbines you can use a Furling tail. It's designed so that at a critical wind speed the wind force on the tail exceeds its weight and lifts it upwards. This results in the turbine turning perpendicular to wind direction. This is sensor-less but it when it turns out of the...

I have now found a reference for this value: Mechanics of Materials, 2nd Edition, E.J. Hearn. page 779 states 'uncontained plastic flow' commences when contact stress --> yield * 2.8

I have calculated a static contact stress of 670 N/mm2 using formula from Mechanical Engineering Design, Shigley, 5th Edition. My problems lies that there is no acceptance criteria. I'm using Grade 5 Structural Steel (yield~355 N/mm2). Previous threads have stated that a 2.5 * yield can...