TY - JOUR
T1 - Mixed-mode I-II-III delamination toughness determination via a shear-torsion-bending test
AU - Davidson, Barry D.
AU - Sediles, Felipe O.
N1 - Funding Information:
This work was co-supported by the NASA Constellation University Institutes Project, Grant NCC3-989, Claudia Meyer, Project Manager, and by the Exploration Technology Development Program/Advanced Composites Technologies Project, Mark Shuart, Project Manager.
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2011/6
Y1 - 2011/6
N2 - A new "shear-torsion-bending" (STB) test is introduced that allows for delamination toughness testing under any ratio of mode I, II and III loading. STB test specimens are similar to those that are used for existing mode I, II and mixed-mode I-II test methods. Three-dimensional finite element analyses are used to show that the distributions of energy release rates across the delamination front are relatively uniform, with the variations being reasonably similar to those that occur in other widely accepted test methods. Closed-form data reduction methods are introduced and are verified for a wide range of material and geometric properties. Thus, the STB appears to be a promising test for evaluating mixed-mode toughnesses of laminated composites under conditions where mode III is present. Use of the STB is illustrated by mode III delamination toughness testing on two different carbon/epoxy materials.
AB - A new "shear-torsion-bending" (STB) test is introduced that allows for delamination toughness testing under any ratio of mode I, II and III loading. STB test specimens are similar to those that are used for existing mode I, II and mixed-mode I-II test methods. Three-dimensional finite element analyses are used to show that the distributions of energy release rates across the delamination front are relatively uniform, with the variations being reasonably similar to those that occur in other widely accepted test methods. Closed-form data reduction methods are introduced and are verified for a wide range of material and geometric properties. Thus, the STB appears to be a promising test for evaluating mixed-mode toughnesses of laminated composites under conditions where mode III is present. Use of the STB is illustrated by mode III delamination toughness testing on two different carbon/epoxy materials.
KW - A. Polymer-matrix composites (PMCs)
KW - B. Delamination
KW - C. Finite element analysis (FEA)
KW - D. Mechanical testing
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U2 - 10.1016/j.compositesa.2011.01.018
DO - 10.1016/j.compositesa.2011.01.018
M3 - Article
AN - SCOPUS:79953669496
SN - 1359-835X
VL - 42
SP - 589
EP - 603
JO - Composites Part A: Applied Science and Manufacturing
JF - Composites Part A: Applied Science and Manufacturing
IS - 6
ER -