Plain (journal) bearing wear and service life
Projected pressure, PV value, wear volume and service life of a plain bearing from shaft/bearing geometry, load, sliding speed and specific wear rate. Unlocked from the legacy demo gate; general in shaft diameter.
Unlocked from the legacy "please login" gate on the shaft diameter. The gate only froze Das to 20 mm; the formula uses Das solely via R = Das/2 with no second hardcoded literal, so it is faithfully general for any shaft diameter (see header comment). The non-stationary (whirl) branch never assigns the contact-angle output `phi` in the original source (a latent bug reproduced here as NaN rather than "fixed").
Method & references
- Plain bearing wear-volume and service-life estimate from worn contact-angle geometry (stationary contact) or a simplified whirl-groove volume (non-stationary contact).
The computation is a literal port of the original client-side JavaScript from /calculators/e4_4.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.