End notch flexture test
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#End notch flexture test license
If you do not agree to the terms of this License Agreement, IMPORTANT- READ THESE TERMS CAREFULLY BEFORE ENTERING THIS ASTM PRODUCT.īy purchasing a subscription and clicking through this agreement, you are entering intoĪ contract, and acknowledge that you have read this License Agreement, that you understand This indicates that the new standard is appropriate for general use and provides a welcome complement to the existing ASTM International standards for determination of the mode I and mixed-mode I-II interlaminar fracture toughness. Results from an interlaboratory study are presented, which illustrates that the variation in test results that are observed in the ENF test using the standardized test method are quite small by historical standards. Other considerations that went into finalizing the test standard, including the determination of span length, range of allowable thicknesses, method of locating the delamination tip after precracking, and load levels to be used during compliance calibration, are then discussed.
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The development of a method of creating static mode II precracks is described, and validation studies are presented. This is followed by results from a combined numerical and experimental study that led to a compliance calibration method being chosen for data reduction, as well as two subsequent studies to determine the delamination lengths used for the calibration tests. Reasons for choosing the end-notched flexure (ENF) test over other candidate methods are first presented. Research is described that supports the approach used in the new ASTM International standard for the determination of the mode II interlaminar fracture toughness of unidirectional polymer matrix composites.