AppendixD
DOGLEG Permanent bend or deforma-
tion, in a wire rope, caused
by
improper
use or handling.
DRAGLINE a) Wire rope used for
pulling excavating or drag buckets, and
b) name applied to a specific type
of
excavator.
DRUM A cylindrical barrel, either
of
uniform or tapering diameter, on which
rope is wound either for operation or
storage; its surface may be smooth or
grooved.
EFFICIENCY (ROPE) Ratio
of
a wire
rope's actual breaking strength and the
aggregate strength
of
all individual wires
tested separately
- usually expressed as
a percentage.
ELASTIC LIMIT Stress value above
which permanent deformation will take
place within the material.
ELONGATION See STRETCH.
END PREPARATION The treatment
of
the end
of
a length
of
wire rope
designed primarily
as
an aid for pulling
the rope through a reeving system
or
tight drum opening. Unlike END TER-
MINATIONS, these are not designed for
use as a method for making a permanent
connection.
END TERMINATION The treatment
at the end or ends
of
a length
of
wire
rope, usually made by forming an eye or
attaching a fitting and designed to be the
permanent end telmination on the wire
rope that connects
it to the load.
ENDLESS ROPE Rope with ends
spliced together to form a single contin-
uous loop.
EQUALIZING SHEAVE The sheave
at the center
of
a rope system over which
no rope movement occurs other than
equalizing movement.
It
can be a source
of
severe degradation and must
be
part
of
regular rope inspections .
EQUALIZING SLINGS Multiple-leg
slings composed
of
wire rope and fit-
tings that are designed to help distribute
the load equally
..
EQUALIZING THIMBLES Special
type
of
load-distributing fitting used
as
a
component
of
certain wire rope slings.
EXTRA EXTRA IMPROVED
PLOW
STEEL (EEIP) A grade
of
wire rope.
EXTRA IMPROVED
PLOW
STEEL
ROPE
(EIP) A grade
of
wire rope.
EYE
OR
EYE SPLICE A loop with or
without a thimble, formed at the end
of
a
wire rope.
FACTOR
OF
SAFETY In the wire
rope industry, this term was originally
used to express the ratio
of
nominal
strength to the total working load. The
term is no longer used since it implies a
permanent existence for this ratio when,
in
actuality, the rope strength begins to
reduce the moment it is placed in
ser-
vice. The term currently used is "design
factor"
.
FATIGUE As applied to wire rope, the
term usually refers to the process
of
pro-
gressive fracture resulting from the
bending
of
individual wires. These frac-
tures may and usually do occur at bend-
ing stresses well below the ultimate
strength
of
the material; it is not an
abnormality although
it may be acceler-
ated due to operating conditions such as
high loads, small sheaves, rust
or
lack
of
lubrication.
Wire Rope Technical Board - Wire Rope Users Manual, Fourth Edition
-135
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