Chapter: Preparing the System
2-14 M10-16245-EN
Coupling Adapters
Coupling adapters let you attach grips and fixtures of different sizes to the load cell and base
adapter, providing more options for testing. There are two primary types:
• For tension testing only:
Tension coupling adapters, also known as self-aligning coupling adapters, which
provide a swivel connection and connect between clevis pin type interfaces. The swivel
action allows the grip or fixture to self-align in the direction of the test load, thus
minimizing any bending load on the specimen.
• For tension or compression testing:
Rigid coupling adapters which also connect between clevis pin type interfaces but use
checknuts to provide fixed connections. This type can also have a threaded interface.
These couplings are not self-aligning and the load string alignment is dependent on the
accuracy of load cell alignment during installation.
When assembling the load string, you may need to use adapters if the load cell interface, or
base adapter interface, differs from your grip interface. A coupling adapter creates a secure
connection between these two different interfaces.
If your grip or fixture interface is the same size as your load cell interface, then you can
connect these directly and you do not need an adapter. If, however, you need the self-
aligning feature that the adapter offers, you should use the appropriate self-aligning coupling
adapter.
Coupling types are listed from the load cell towards the accessory or from the frame base
towards the accessory. For example, if you need to connect a load cell with a Type D
(female) connector to a grip with a Type O (male) connector you require a Type Dm to Of
adapter.
Select Grips and Fixtures
A set of grips are installed on the system during installation by a service engineer. If your
testing requires it, you may need to install a different set to obtain optimum test results.
The selection of grips depends on the material, geometry and strength of the test specimen.
In compression testing, the diameter or area of the anvil is important, in addition to the
maximum loading capacity.
For tensile testing:
Make sure the tensile strength of the specimen does not exceed the maximum loading
capacity of the grips.
Minimize the risk of slippage by:
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