Mts 709 Alignment System User Manual download pdf (Page 83)

709 Alignment System Specimen Offsets

Specimen Offsets

The bent front and bent back measurements are taken before the gauge offset is

removed, therefore both the bent front and bent back offset values include the

gauge offset. Because the bent mean offset is the average of the bent front and

bent back values, it also includes the gauge offset, and is always in the middle of

the bent front and bent back when graphed. The following figure (Strain Offset

Relationship) shows this relationship for the middle gauges.

It is noteworthy to determine the amount of bending that is due to the

straightening of the specimen, and the amount of bending that is due to the

misalignment of the load unit. The bending due to the straightening of the

specimen is interesting because it indicates how straight the specimen was

manufactured and can potentially indicate if the specimen has deformed over

time due to use, handling, etc. The bending due to the misalignment of the load

unit is interesting because it indicates how well the load unit was aligned when

the bent mean was calculated. A large load unit misalignment can conceivably

cause more error in the bent front and bent back measurements, and thus lead to

more error in the calculated bent mean value.

Strain Offset Relationship

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Mts 709 Alignment System User Manual Page 83