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Simulation of progressive damage formation and failure during the loading of cross-ply composites.

McCartney, L N (2001) Simulation of progressive damage formation and failure during the loading of cross-ply composites. NPL Report. MATC(A)20

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The objective of this report is to summarise the current status of theoretical models and associated software that are designed to predict damage initiation and growth in cross-ply laminates to the point of failure. For the case of static loading to failure, the damage modes that are modelled are ply cracking in the 90 o plies of the laminate, fibre failure in the 0 o plies (using Monte Carlo methods), and fibre/matrix debonding associated with fibre fractures. Biaxial loading of the laminate is permitted, and account is taken of the effect of thermal residual stresses at both the fibre/matrix and ply levels. The computer application for the prediction of failure during static loading is known as STRENGTH.
For the case of the environmental degradation of cross-ply laminates arising from exposure to aggressive environments, the principal damage mode is fibre failure arising from the operation of stress-corrosion mechanisms at the fibre defects. Ply cracking is not included in this model. A computer application known as RESIDUAL has been developed that predicts the lifetime, and time dependence of residual strength, for a cross-ply laminate subject to biaxial loading and thermal residual stresses in an aggressive environment.
Descriptions are given of the physical basis of the models, and the associated assumptions. In addition a description is given of how to operate the software, and sample numerical outputs are given. These results can be used to confirm that the software has been installed correctly, and act as a record of software performance (for quality assurance purposes) for the current versions of the applications STRENGTH and RESIDUAL.
High quality model validation data (obtained in collaboration with others) are presented that relate to model performance at the fibre/matrix level, and ply cracking level. The validation of the application software is an on-going activity that has not reached a state of maturity. This is particularly true for strength and environmental degradation predictions, which are very complex phenomena that are very difficult to model reliably. The current versions of the applications are regarded as the first useful steps.

Item Type: Report/Guide (NPL Report)
NPL Report No.: MATC(A)20
Subjects: Advanced Materials
Advanced Materials > Materials Modelling
Advanced Materials > Composites
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2009

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