(Received 20 May 2003; accepted 27 August 2003)
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The mixed-mode bending (MMB) test for delamination toughness was first introduced in 1988. This simple test is a combination of the standard Mode I (opening) test and a Model II (sliding) test. This MMB test has become widely used in the United States and around the world for mixed-mode toughness measurements. Because of the widespread use of this test method, it has been standardized by ASTM Committee D30 as ASTM Standard Test Method D6671. During the standardization process a round robin test activity was conducted that led to several modifications to the test protocol. These modifications included a new method for calculating toughness from the measured test quantities, a more accurate way of setting the mixed-mode ratio to be tested, and the inclusion of a new alignment criterion for improved consistency in measured values. The rational for these modifications, which were included in the test protocol before standardization, are discussed in this paper.
NASA Langley Research Center, Hampton, VA
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