I am trying to get a feel for what the low temperature (-15 Deg C / 5 Deg F) Charpy V notch energy for 1038-1045 steel when quench and tempered to 30-32 HRc.
I have conducted Charpy impact testing to normalized 1045 before and achieved only 6-7 J @ -15 Deg C. Will Quench and Tempering to 30-32...
metengr,
thanks for your reply
If I want to ensure that such a system is limited by the threads in my example, surely if the coupling is very big in cross section it would not fail in an impact load that would fail the bolts??
My question s how much bigger in cross section? can you just use...
I have been asked a question that seems to have an easy, obvious answer answer, but is it this simple.
If I have two parts that have a reasonable Charpy impact strength ( "A" joules) loaded in tension and wish to connect them with another part with a lower impact strength ( "B" joules), is it...
I have recently received some 4140 investment cast sample parts from our Chinese supplier, and although they looked good, failed in a very brittle manner. Investigation revealed that the parts we in fact not heat treated.
I am about to test them again after a proper quench and temper to...
A friend is making up some replacement pins and bushes from the front end of a skid steel loader.
The worn ones are about 38mm OD (1 1/2") and come up at 60 HRc measured at the surface and 50 HRc at the core.
Obviously the originals were case hardened to get up to 60 HRc, but what material...
Thankyou for the positive responces, at least it can be done.
Material is just mild steel
I have found some theory in an astm or asme manual but the formulas fall over for such thick material
Would this be design by trial and error? Where do I start?
Thanks
Ian
eng-tips, by professional...
I know it is pretty common to form a boss in sheet metal that is then tapped. For instance in say 1mm thick steel to produce a boss that might be 3-4mm high that is then tapped M3.
I want to use this process to put an M20 female thread into a 10 or 12mm thick plate, achieving around 16mm of...
Hi,
We have been running Catia now for about 12 years, initially V4 and then V5 (ME2 & MD1)from about 2000. Most of our design work is solid modelling assemblies with a little surfacing.
We are now considering whether to upgrade to V6, or alternately drop Catia and go across to SolidWorks...
What I am designing is sort of like a automotive clutch pressure plate, where I want the fingers to bend through 90 degrees without yielding when a large shaft is inserted through it. The spring rate is not as critical as long as the fingers can spring back to their original position. Hence I...
I am trying to design a simple cantilever spring that needs to bend through 90 degrees. Do I use simple cantilever beam theory to determine the stress?
I am going to use 1055-1065 spring steel approximately 0.5mm thick. The beam will be approx 50mm long and 4mm wide.
|...
Thanks Pud & Patprimmer for the thoughts on PA6 verses PA66.
What is the diference in temperature rating for these two Nylons? This wil certainly weigh heavily apon the suitability.
Ferret.
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com...
patprimmer,
Thank you for your response. I have assumed that the difference in cost in the states will be about the same as here in Oz, but am hoping someone on the other side of the pacific can confirm this for me.
I am in Melbourne and although we have many plastic parts they are all...
Does anyone know what the difference in cost is for Polypropylene and Nylon66 raw material in the USA?
I have some parts made in the United States at the moment in PP, and am going to ask if it is possible to use PA66. Before I do, I would like to know what sort of premium I am going to be...
Last year I posed a question in a thread regarding a compression spring that was failing under cyclic testing. thread693-193540
For those that tried to help, I thought you might be interested how I eventually solved the problem.
I eventually realised that during the compression, the spring is...
What is the best way to determine the grade of plastic used on a particular injection moulded part?
If it were steel I would have it spectro-analysed, but I don't know if there is a way to do this to plastic.
I have seen the charts with the smoke characteristics when burned, but these don't...
