Model
E 50.20
Model E 50.20
is an extensometer designed for relatively large strain levels,
using a 50 mm gauge length and accepting strains up to 20 percent.
The features of this instrument include:
- Easy to
handle and attach, with no danger of damage to sensing unit.
- Positive
stop to ensure exact gage length.
- Overstrain
protection link-extensometer will only respond up to design
strain level.
- Replaceable
hardened and ground contact surfaces.
- Output
can be read with any conventional strain indicator.
- Factory
calibrated.
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Model
E 50.20

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This
unit is ideal for teaching laboratories in materials and material
properties, since it will allow strains to be read on tensile specimens
without the need for expensive and time consuming strain gage application.
It can be used over and over again, and when needed the contact
points can be replaced easily and quickly. Due to it's large strain
range, it is well suited to non-metallic materials such as plastics
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Model
E 40.06

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Model
E 15.15

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Model
E 40.06 & Model E 15.15
This extensometer
uses modular components which allow for easy design variations.
The photo on the left shows a standard form of 40 mm (1.6 in.)
gage length designed for a limited 6% strain range. The photo
on the right shows a miniature version using a 15 mm (0.6 in.)
gage length with a 15% strain range. All models employ a 350 ohm
full bridge configuration and use a specially constructed extra
flexible cable. Due to the modular design these may be built in
many gage lengths and sizes, and so can be tailored to a variety
of applications. Output is high, approximately 3 to 4 mv/v F.S.,
and can be read on any strain or transducer indicator. Check with
us to determine if a specific model of this design will fit your
requirements.
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Model
E 50.30
Modeled E
50.30 is a new highly advanced extensometer designed primarily
for very large strain ranges, in this case 30% based on initial
gage length of 2.00 inches. It is simple to use, similar to Model
E 50.20, yet it is capable of accurately tracking strains up to
the full maximum limit. This makes it useful in tests on plastics,
elastomers and other non-metallic materials. Conventional resistance
strain gages cannot operate successfully at these high strain
levels, and in some cases they may stiffen soft materials locally
and be inaccurate even at low strain levels. It is furnished with
complete calibration data and full instructions for use.
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Model
E 50.30

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Model
E 6.40
Model E 6.40
extensometer is designed for fracture mechanics studies such as
determination of KicJic and crack growth.
It is intended for use in specimens with a 0.2 to 0.25 inch crack
opening dimensions, such as specified in ASTM E399. Due to its
small size and high sensitivity, it may also be used as a very
sensitive extensometer in compression studies.
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Model
E 6.40

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In
this design, a pair of double cantilever arms are rigidly attached
to a mounting block. Strain gages on the arms form a full bridge.
Spring forces to compress the arms are high enough so that the extensometer
is self-supporting when compressed and inserted in a machined crack
and
no auxiliary supports are needed.
The recommended range of motion for the cantilevered arms is 0.15
to 0.3 inches. This unit is small, light and quite rugged so it
is capable of daily use. It can be modified upon special order for
other crack opening dimensions, but is normally furnished for the
0.20/0.25 inch crack size. |