MTS Series 609 Alignment Fixture - Manual (Page 58)

Series 609 Alignment Fixture Product Information 58
Adjust the Concentric Alignment
Alignment Procedure
Adjust the Concentric Alignment
In this section, you move the upper grip laterally to reduce the specimen’s “S”
bend. You will probably end up with readings characteristic of a “C” bend—
tensile and compressive readings on opposite sides of the specimen.
1. Refer to your ASTM Standard Test Method (or other appropriate standard)
for the maximum bending strain permitted.
Note Your test specification permits a maximum 10% bending strain. You will
be applying an axial force to produce 1000 µS on the specimen. 100 µS
is the maximum bending strain you can have at any gage level.
2. Write down the strain readings from each gage.
Find the maximum bending strain at each gage level. Use the formulas in
“Preparing a Gaged Specimen” that are appropriate for your specimen.
• If each level’s maximum bending strain falls within specifications, go
to “Checking the Alignment.”
• If any level’s maximum bending strain exceeds specifications, continue
to Step 3.
Record all
strain readings
to find the
maximum
bending strain.