Chapter: Testing specimens
92 M10-17313-EN
shield door is open), the circuit is interrupted and the system is either disabled or
restricted as defined by the Operator Protection settings.
Testing with no interlock
This test scenario assumes the system has no accessories with an interlock and that the
start test method in Operator Protection settings is set to Frame control (the default).
Set the load frame limit stops to limit crosshead travel, and set adequate transducer
limits to ensure the safe operation of the testing system.
Set all available limits before using the system to avoid crosshead overtravel, contact
between grips and fixtures, overloading any component of the load string, or overtravel
of a contacting extensometer.
Hazard - do not allow more than one person to operate a testing machine.
Operator injury may result if more than one person operates the testing machine. For
example, injury can occur if one person moves the crosshead or actuator while the other
is working inside the hazard area between the grips or fixtures.
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.
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