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Standard Knife Edges (Part No. 350210-01):
Produced from hardened tool steel, these knife edges are used for a wide
range of applications, and can be used on both round and rectangular
shaped specimens. These are the standard knife edges supplied
with most Epsilon extensometers. |
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Dual Bevel Knife Edges (Part No. 350210V2-01):
Produced from high toughness tool steel. These knife edges are used in
applications where the standard knife edges may experience excessive
chipping, such as on very hard metals. They are also ideal for
high modulus composites. The dual bevel design and tougher material of
construction provides a greater resistance to damage during testing.
These knife edges are also recommended for biomedical testing
(especially bone) where stability of the contact point can be
compromised due to the softness of the test specimen. The dual
bevel edge prevents slight output shifts on the sample that can result from the
standard knife edges biting into the sample. |
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Ceramic Knife Edges (Part No. 350210C2-01): These
knife edges are typically used in low cycle fatigue applications on
hard metals where metallic knife edges would likely experience undue
wear. They are also used on the submersible
Model 4030 extensometer to prevent galvanic corrosion between
the extensometer and the test specimen. |
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Hardened Stainless Steel (Part No. 350210-02): These
knife edges are designed to be used in environments where additional
strength and corrosion resistance is required. Primary
applications are in biomedical testing where the knife edges may be
exposed to saline solutions. |
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Three-point Contact Knife Edges (Part No. 354299):
These knife edges were designed for use on flat specimens.
They ensure stabel contact on flat test samples due to 3-point
contact. |
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Extended Knife Edges (Part No. 350210EXT-01): Knife
edges for applications where the additional length is required, such
as where the grips are very close together. Longer lengths are
available on special order. |
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Rounded Knife Edges (Part No. 350210-BLUNT):
Knife edges designed for use on transverse extensometers and applications where blunt edges are
required. These are primarily used on transverse or diametral
extensometers, such as the 3575,
3575AVG and
3675. |
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Vee Knife Edges (Part No. 352610-01): Designed
for use on round specimens. Due to the contact point variation
that can occur between specimens of different diameters, units with
these knife edges must be calibrated with posts of equal diameter.
On extensometers with longer arms, errors created by this variation
are not so pronounced, but on units with shorter arms lengths, this
must be taken into consideration. The primary advantage is
self-centering on the test sample. |
