Thanks Cory. Use the lab used an electron microsope and noted that in their opinion, the corrosion did not play a factor in the failure. However it did contaminate the initial stress fracture.
Thanks Cory. The failure is due to stress only in four of the springs tested. Hydrogen embrittlement only occurs from a plating process called pickling where parts are electro cleaned using hydrochloric acid and subsequently plated trapping hydrogen withtin the grain and causing failure. In this...
One consideration will be friction. Another consideration is once the spring is torqued around the rod and grip force is applied, you can quickly overstress the moment arm and exceed the yeild strength of the material. Since you are dealing in Bending stresses the % stress before yeild is quite...
yes it did.The failure is due to stress and not the corrosion. It would take a great while for the superficial corrosion to affect the spring properties, as the oxidation is in very fine particulate. The problem lies in seepage of the rust color to the outside of the housing. Not favorable. Over...
Not in great detail you're right. Attached are the formulas and a great chart for calculating large deflections in cantilever springshttp://files.engineering.com/getfile.aspx?folder=8c499c92-13fa-4b1f-8679-dc938d76fc15&file=DOC_(37).PDF
Both springs were exposed to the same ambient conditions. Only the one inside the housing exhibited rust. Do you or anyone know of particular additives to ABS that may be corrosive to carbon steel?
We are seeing a Music Wire Spring ASTM A228 exhibiting rust very quickly during cycle testing. The spring is enclosed in an ABS housing. Small fines of ABS are present from wear. The spring when cycled by itself in ambient conditions, exhibits little or no rust. What is the Chemical reaction...
