دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see stretch.

an increase in length expressed numerically as a percent of initial length.

n: the ratio of the increment of some specified form of stress to the increment of some specified form of strain, such as bulk modulus, shear modulus, or Youngs modulus. Also called coefficient of elasticity. elasticity modulus, elastic modulus.

stress over strain. A measure of stiffness or Young’s Modulus (E). Rocks are ½ to 12 x 106 psi and mild steel is 30 x 106 psi. Modulus refers to stress at a predetermined level of elongation, usually at 100% elongation. The higher the modulus of a compoun

n: an increase in the effective stroke length of the plunger of a sucker rod pump caused by the elongation of the rod string due to the dynamic loads imposed by the pumping cycle.

n: in crane operations, the permanent deformation of a wire rope or sling caused by the pull of a load too heavy for the rated load capacity of the rope or sling. A stretched rope or sling should be immediately removed from service. Also called elongation.

n: in a roller chain drive, an amount of stretching that causes the chain to engage improperly with the sprockets. wear pad n: a flat metal protrusion of a downhole tool that is usually hardfaced and that protects the rotating tool from wear.