Page 63 - Mechanical Engineer's Data Handbook

52 MECHANICAL ENGINEER’S DATA HANDBOOK

Ball on concave surface, same material: Two rollers in contact, same material
r2 negative
~~
32F( 1 - v’)
. aC=4F/nwL
6F(1 -v2) nLE(l/r, + l/r2)’
; crc=3F/2na2
Wr1- W2)

Two rollers in contact

Roller on frat surface, same material: r2 = 00, rl = r
Contact width
32F( 1 - v2)r
16F((1 -v:)/E, +(1 -v2)/E2) w = /-; sLE cr, = 4F/wL
; crC=4F/nwL
nL(l/r,+ 1/12)

IF

Roller on concave surface, same material: r2 negative

32F( 1 - v’) ’ 0,=4F/nwL
nLE(l/r, - 1/r2)’