Brake Tests
År: 1913
Forlag: Pensylvania Railroad Company
Sted: Altoona, Penna.
Sider: 401
A Report Of A Series Of Road Tests Of Brakes On Passanger Equipment Cars Made At Absecon, New Jersey, In 1913
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254
influence was in the direction of producing better shoe bearing con
ditions and consequently a higher coefficient of friction.
Fig. 152.
BRAKE SHOE BEARING AREAS—PLAIN SOLID SHOE.
498. However, the data are such that it is possible to conclude
that the magnitude of the bearing area does change throughout the stop and
is greatest near the end of the stop.
499. During these tests it was noticed that the bearing area
shifted that is to say, a spot which was found in the bearing area early
in the stop, was found in the non-bearing area later.in the stop.
500. A study of all the bearing area measurements both for con-
tinuous and intermittent stops leads to the conclusion that none of
the values of the bearing areas determined are sufficiently accurate to
establish a true relation between bearing area, pressure density and
mean coefficient of friction.