Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 42, Issue 11, Pages 1809-1825Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2011.08.004
Keywords
Crashworthiness; Carbon fiber; Impact behavior; FEA
Funding
- Federal Aviation Administration
- Boeing Company
- Automobili Lamborghini S.p.A.
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The suitability of a progressive failure material model to simulate the quasi-static crushing of a composite specimen is evaluated. The commercially available material model MAT54 Enhanced Composite Damage in LS-DYNA is often utilized to simulate damage progression in dynamic failure simulations because it requires a reduced number of experimental input parameters compared to damage mechanics-based material models. The composite specimen used for the experiments is a semi-circular sinusoid, and is comprised of carbon fiber/epoxy unidirectional prepreg tape. Results show that MAT54 can successfully reproduce experimental results, however the simulation is highly sensitive to changes in model parameters, which are either non-physical (i.e. are purely mathematical expedients), or cannot be measured experimentally. These include element size, contact definition, load-penetration curve, and crush front softening parameter, among others. Therefore, achieving successful simulation results requires extensive calibration of these parameters by trial and error, and a deep understanding of the strengths and challenges of the selected modeling strategy. (C) 2011 Elsevier Ltd. All rights reserved.
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