ASTM D3846 In-Plane Shear Strength of Reinforced Plastics
ASTM D3846 describes the method for determining the inplane shear strength of reinforced plastic composite materials. These specimens are typically thermosetting plastics with reinforcements that widely vary in type and thickness ranging from 2.54 mm to 6.60 mm.
The test method is similar to that of ASTM D695, Test Method for Compressive Properties of Rigid Plastics, except that in the ASTM D3846 method, failure of the specimen occurs in shear between two centrally located notches that are machined halfway through the thickness of the specimen and spaced a fixed distance apart on opposing faces. The same compression fixture is used in both methods and placed between two hardened steel compression platens. Due to the high compressive forces expected, we usually recommend a dual column electromechanical test frame configured with Bluehill® software for this application.
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5960 Dual Column Series are versatile universal testing instruments for mid-range testing up to 50 kN. They are commonly used for plastics, metals, rubber materials, automotive components, composites and non-ambient temperature applications.
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Instron® testing systems provide an accurate measurement of force during a test, but in order to produce accurate stress results, you must measure the specimen and get the dimensional data into Bluehill® Universal Software. While digital instruments, such as micrometers, can provide accurate measurements, using them properly takes time and requires the operator to manually enter the dimensional data into the software.
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