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3421

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3421 Sandwich Core Shear and Rigid Cellular Plastic Shear Testing Extensometers NEW PRODUCT For measuring shear properties of sandwich cores and rigid cellular plastics. The simple clip-on design attaches in seconds and provides repeatable test results. Model 3421 clip-on attachment Model 3421 zero pin removal Model 3421 ready for testing Model 3421 extensometers measure shear strain of foam and honeycomb sandwich cores, as well as rigid cellular plastics. These extensometers can be used to measure shear modulus, 2% offset shear strength, and stress-strain curves prior to specimen failure. The extensometer may Model 3421 shear testing extensometer be used to measure strain through specimen failure with specimen fixturing to limit out-of-plane expansion. The Model 3421 may also be used for sandwich core shear fatigue testing. The Model 3421 is applicable for testing to the following standards: • ASTM C273 Shear Properties of Sandwich Core Materials • ASTM C394 Shear Fatigue of Sandwich Core Materials • ISO 1922 Rigid cellular plastics -- Determination of shear strength • DIN 53294 Testing of sandwiches; shear test • EN 12090 Determination of Shear Behavior of Thermal Insulation Products (single specimen test only) The extensometer mounts to the test specimen’s loading plates. It attaches to the specimen in seconds and can be used with tension or compression test fixture loading. The extensometer is adjustable to work with a range of specimen thicknesses and widths, and includes a built-in scale for setting it to the specimen width. To use the extensometer, the test operator clips it onto the specimen by squeezing two pads, placing the extensometer against the side of the specimen, and releasing the pads. The extensometer is self-supporting and no further adjustments are necessary. It is removed before failure by unclipping. Model 3421 extensometers are strain gaged devices, making them compatible with any electronics designed for strain gaged transducers. Most often they are connected to a test machine controller and Epsilon will equip the extensometer with a compatible connector wired to plug directly into the controller. For systems lacking the required electronics, Epsilon can provide a variety of solutions for signal conditioning and connection to data acquisition systems, chart recorders, or other equipment. See the Model 3421 extensometer video Visit our website at www.epsilo

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technology corp Features • Replaces homemade extension gages and LVDTs with a reliable, repeatable solution. • Simple clip-on design attaches in seconds. • May be left on through specimen failure when fixturing is used to constrain thickness expansion of the specimen. • Meets ASTM C273 requirements for extensometers. • Extensometer measuring arm has mechanical overtravel stops for durability. • Replaceable components for ease of repair. • Full bridge, 350 ohm strain gaged design for compatibility with nearly any test system. • Includes high quality foam lined case. Ordering Information...

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