Static Pull Testing of a New Type of Large Deformation Cable with Constant Resistance

Table 1

Geometrical parameter of constant casing tube.

Specification	Geometrical parameter (mm)			Wall thickness (mm)	Material properties
	External diameter/	Inner diameter/	Length/
CRLD-I	133	93	2000	20	20# steel
CRLD-II	133	113	2000	10	20# steel
CRLD-III	133	121	2000	6	20# steel

Note. 20# steel: the carbon content of this kind of steel is 0.2%, the tensile strength is 253–500 MPa, and the elongation is 24%. The strength of 20# steel is lower than 45# steel, but the toughness and plasticity are better.