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- W300935545 abstract "The Mixed-Mode Bending (MMB) test uses a lever to simultaneously apply mode I and mode II loading to a split-beam specimen. An iterative analysis that accounts for the geometric nonlinearity of the MMB test was developed. The analysis accurately predicted the measured load-displacement response and the strain energy release rate, G, of an MMB test specimen made of APC2 (AS4/PEEK). The errors in G when calculated using linear theory were found to be as large as thirty percent in some cases. Because it would be inconvenient to use a nonlinear analysis to analyzed MMB data, the MMB apparatus was redesigned to minimize the nonlinearity. The nonlinear analysis was used as a guide in redesigning the MMB apparatus. With the redesigned apparatus, loads are applied through a roller attached to the level and loaded just above the midplane of the test specimen. The redesigned MMB apparatus has geometric nonlinearity errors of less than three percent, even for materials substantially tougher than APC2. This apparatus was demonstrated by measuring the mixed-mode delamination fracture toughness of APC2. The data from the redesigned MMB apparatus were analyzed with a linear analysis which yielded results similar to those found with the original apparatus and the nonlinear analysis." @default.
- W300935545 created "2016-06-24" @default.
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- W300935545 date "1991-01-01" @default.
- W300935545 modified "2023-09-27" @default.
- W300935545 title "Nonlinear Analysis and Redesign of the Mixed-Mode Bending Delamination Test" @default.
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