SPLIT COLLAR TENSILE GRIPS
Split collar
grips are used to tensile test round bar specimens having enlarged
ends and reduced central cross sections. They provide a unique type
of gripping. And spherical seats can be built in also, to aid in
minimizing induced bending in the specimen. Candidate specimen
materials include, in particular, brittle metals and ceramics.
There are a
wide variety of specimen sizes and configurations. As one example,
grips to test ASTM F 519 type specimens (Reference 1) are shown in
the following photograph. The tapered sleeves slip over the split
collars to hold them in place after the specimen is installed. Note
the spherical seat inserts where the grips attach to the testing
machine (the lower insert can be seen in the photograph).
Split Collar
Grips Used to Test ASTM F 519, Type 1a.2 Specimens
The standard specimen shown has rectangular knob ends and
a grooved (reduced area) section at its center
Another
pair of split collar grips, similar to the above pair but with
specimen contact surfaces contoured to match the 1/8” radiused
(rather than square as above) shoulders of the specimen ends, are
shown in the following photograph. The spherical seat in the
threaded testing machine attachment fitting can be better seen in
this photograph also.
Split Collar Grips Used to Test
Brittle Ceramic Specimens
1/8” Diameter Specimen Bearing Radii, and Spherical Seat End
Attachments
Source
of Additional Information:
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