Recent content by Walker59

Usually, Hertz contact stresses are judged by the shear stress just below the surface. It will be ~211 N/mm2 in your case. Using Tresca's criterion, a minimum yield stress of ~422 N/mm2 will be required (for ductile materials). But yes, in static cases you can often allow for higher stress...

Hi TLDCC, That is a coincidence. I'm looking into this model too. I'm busy updating my freeware program HertzWin (see under Toolkit at en.vinksda.nl) with surface roughness influence. The best I've found so far is to use the graph of the model with the coefficient alpha against...

Hi TLDCC, In a general contact of rough surfaces, there will be multiple asperities in contact and its undo-able (virtually impossible) to analyze each asperity individual. So yes, the average value will be a good measure. What is the background of your question? Jaap

Hi TLDCC, I guess you refer to the contact analysis of rough surfaces? In that case, the asperity density is the number of asperities (roughness peaks) per unit area. The radius of curvature is the radius of the top of these asperities (that makes contact with the other body). Jaap