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Prediction of failure envelopes and stress strain curves of fiber composite laminates under triaxial loads: comparison with experimental results

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>03/2013
<mark>Journal</mark>Journal of Composite Materials
Number of pages14
<mark>Original language</mark>English


This paper represents the authors’ contribution to Part B of the Second
World Wide Failure Exercise (WWFE-II), in which the failure predictions and
stress strain curves of twelve test cases are compared with experimental
data. The paper briefly reviews the methodology presented in WWFE-II
Part A, which includes a semi-analytical stress analysis model and
Christensen (2007, 2008)’s failure criteria. A further development in this
paper is to introduce a new failure criterion developed also by Christensen
(2009) and the application of the criterion in conjunction with the stress
model. These failure criteria have no adjustable parameters and only
depend upon a minimal number of measurable failure properties.
Comparisons between the theoretical predictions using different criteria
and the experimental results provided by the WWFE-II organizers are
shown in diagrams. It appears that Christensen (2008)’s failure criteria
predict the failure strength satisfactorily in most of the test cases.
Christensen (2009)’s Polynomial Invariants theory compares also well with
the experimental results. However, the layup-dependent strength
properties required in the criterion are sometimes very difficult to evaluate
without performing experimental tests.