Strain
The change in length divided by the initial length.
Strain Rate
The time rate of increase of strain. In a test machine this is the rate of cross-head
travel divided by the original distance between the grips or the gage length of a
reduced cross-section.
Stress
The mechanical force per unit area imposed upon a solid material,
Support instrument
A critical part for mission success, it has multiple functions; it provides power to
the science payload and all vital systems, stores power from solar panels, provides
communication to/from the ground via satellites or line of sight, stores data on
board, as well as other important functions. The support instrument can weigh as
much as 2,000 lb.
Tear Failure
A tensile failure characterized by fracture at one edge of the specimen and progressing across the specimen at a rate slow enough to produce an anomalous load
deformation curve.
Tensile Strain
Is based upon both lengths in the same direction. In shear strain, the change of
length is at right angles to the initial gage length.
Tear Strength
The force per unit thickness required to initiate or to propagate a tear across the
material.
Tensile Strength
The maximum force per unit area prior to fracture of a material. The restraining
area is at right angles and is concentric with the axis of the applied force.
342 Glossary and Terminology
The change in length divided by the initial length.
Strain Rate
The time rate of increase of strain. In a test machine this is the rate of cross-head
travel divided by the original distance between the grips or the gage length of a
reduced cross-section.
Stress
The mechanical force per unit area imposed upon a solid material,
Support instrument
A critical part for mission success, it has multiple functions; it provides power to
the science payload and all vital systems, stores power from solar panels, provides
communication to/from the ground via satellites or line of sight, stores data on
board, as well as other important functions. The support instrument can weigh as
much as 2,000 lb.
Tear Failure
A tensile failure characterized by fracture at one edge of the specimen and progressing across the specimen at a rate slow enough to produce an anomalous load
deformation curve.
Tensile Strain
Is based upon both lengths in the same direction. In shear strain, the change of
length is at right angles to the initial gage length.
Tear Strength
The force per unit thickness required to initiate or to propagate a tear across the
material.
Tensile Strength
The maximum force per unit area prior to fracture of a material. The restraining
area is at right angles and is concentric with the axis of the applied force.
342 Glossary and Terminology