4-5
Installing a Specimen
Operation
Procedure
1. Center the specimen in the grips. Make sure the specimen is perpendicular
and contacts the entire length of the jaw faces as shown in Figure 4-1 on
page 4-4.
2. Close the upper grip.
3. Close the lower grip.
4. Adjust the air pressure to the minimum required to hold the specimen during
the test, without exceeding the grip’s maximum air pressure rating.
Crush Hazard - Take care when installing or removing a specimen,
assembly, structure, or load string component.
Installation or removal of a specimen, assembly, structure, or load string
component involves working inside the hazard area between the grips or
fixtures. When working in this area, ensure that other personnel cannot operate
any of the system controls. Keep clear of the jaws of a grip or fixture at all
times. Keep clear of the hazard area between the grips or fixtures during
actuator or crosshead movement. Ensure that all actuator or crosshead
movements necessary for installation or removal are slow and, where possible,
at a low force setting.
Flying Debris Hazard - Make sure that test specimens are installed
correctly in grips or fixtures in order to eliminate stresses that can cause
breakage of grip jaws or fixture components.
Incorrect installation of test specimens creates stresses in grip jaws or fixture
components that can result in breakage of these components. The high energies
involved can cause the broken parts to be projected forcefully some distance
from the test area. Install specimens in the center of the grip jaws in line with
the load path. Insert specimens into the jaws by at least the amount
recommended in your grip documentation. This amount can vary between 66%
to 100% insertion depth; refer to supplied instructions for your specific grips.
Use any centering and alignment devices provided.
Note: Recommended specimen insertion depth is 100%. The specimen should fully
contact the entire length of the jaw faces.
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