ASTM D2344 Short-Beam Testing of Polymer Matrix Composite Materials

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ASTM D2344 Short-Beam Testing of Polymer Matrix Composite Materials

ASTM D2344 is a test method used to find the short-beam shear stress of fiber-reinforced composite materials. Short-beam shear is used to determine interlaminar shear strength of parallel fibers. The data can be used for quality control and process specification purposes. ASTM D2344 can be used for all types of parallel fiber reinforced plastics and composites, provided that the failures occur consistently in the same mode 5. Use a short beam specimen that is machined from a curved or a flat laminate up to 6.00 mm, equivalently 0.25 inch, thick.

Measure the thickness and width of the test specimen before conditioning. Next, place the specimen on a horizontal shear test fixture so that the fibers are parallel to the loading nose. Then use the loading nose to flex the specimen at a speed of .05 inches per minute until rupture. Finally record the force and use the official standard calculations to determine shear strength.

ASTM D2344 requests a three-point bending system. This type of fixture can be placed on a universal testing machine. Alignment is critical so we offer subframes to ensure it is kept stiff (see G884).