....Model 3541 Fracture Mechanics
    Clip-On Gages ....

For fracture studies, in compliance with standardized test methods
such as ASTM E399 for fracture toughness and E813 for JIC.

These gages conform to the requirements of ASTM E399. In addition, the modified groove design complies with E813 tests where greater stability and accuracy results from the sharper groove root.

Clip-on gages are used for a variety of fracture mechanics testing, using compact tension, arc shaped, disk shaped, bend specimens or other specimen geometries in compliance with ASTM and other standards organizationís test methods.

These gages are a full bridge strain gaged design. They are compatible with any electronics designed for a strain gaged transducer.

Clip-on gage can be used directly on test specimens where the knife edges are integral with the test specimen, or alternately with optional bolt-on knife edges.

Shunt Calibration Module available

Subtitle: Special Models for Other Fracture Mechanics Testing

Special units are available for other fracture mechanics tests. For example, the drawing shows a gage for ASTM E1304, Plane Strain Fracture Toughness. This example was produced for a 1 inch diameter bar, with 0.4 inches of travel. Its performance and design is an enhancement of the design recommended in E1304, with better accuracy.


High accuracy, full strain gaged bridge construction.
Sharp grooves per ASTM E813 for improved stability when mounted.
Optional bolt-on knife edges.
Compatible with any strain gaged electronics.
Fully enclosed gages to protect from accidental damage.
All capable of high frequency operation (50 Hz or faster, depending on model).
Supplied with high quality foam lined case.


Linearity: 0.15% for travel ranges less than 4 mm (0.25 in.)
                  0.2% for greater travel ranges
Output: 2 to 4 mV/V nominal, depending on model
Excitation: 10 VDC typical, 15 VDC or VAC max.
Temperature range: -40 to +100 C standard (-40 to +210 F).
Cable: Ultra-flexible cable, 8 ft. (2.5 m) standard

Shunt calibration module
Available in special versions
Severe environment versions available

Model 3541 Available Versions:
The following combinations of gage length and travel
listed below are available as standard, except as noted.
All are available in any temperature range listed.

Compressed Gage Length Travel Ranges
3 mm 12 mm
5 mm 2.5, 7, 10 or 12 mm
8 mm 10 or 12 mm
10 mm 1, 4, 8, 10 or 12 mm
12 mm 4 or 12 mm
20 mm 4 mm

Compressed Gage Length Travel Ranges
0.2 inches 0.1, 0.25, 0.3, or 0.5 in.
0.3 inches 0.15 in.
0.475 inches 0.15 or 0.5 in.
0.5 inches 0.15, 0.25 or 0.5 in.

Temperature Ranges:
Low: -265 to + 100 C (-450 to +210 F)
Standard: -40 to +100 C (-40 to +210 F)
High 1: -40 to +150 C (-40 to +300 F)
High 21: -40 to +175 C (-40 to +350 F

1Short term use to +200 C (400 F) acceptable

For more information on calibration services or digital retrofits please contact us.



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Emlenton, PA 16373
(724) 867-6664 or (800) 793-1870
FAX (724) 867-1346

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