ISSN: 0884-6804
Page Count: 5

Refinements to the Mixed-Mode Bending Test for Delamination Toughness
Reeder, JR
NASA Langley Research Center, VA

(Received 20 May 2003; accepted 27 August 2003)

Abstract

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.

Keywords:
delamination, composite, fracture toughness, mixed-mode, MMB, testing

Paper ID: CTR10961J
DOI: 10.1520/CTR10961J
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