Computational insights into high strain rate self-stiffening mechanism in nacre

J. Liu, X. Li, Y. Qi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

It has long been identified that nacre, natural body armor, has extraordinary mechanical properties such as high strength and eminent toughness. What's more, under dynamic strain rate (∼103 s-1), both modulus and strength are surprisingly increased comparing with quasi-static strain rate (∼10-3 s-1). However, the mechanism of this unusual high strain rate self-stiffening phenomenon in the ceramic based natural armor remains ambiguous. In this study, a slab model is built to describe stacking fault and twin formation processes when nacre is deformed. Ab initial calculation is carried out using density function theory (DFT) under generalized gradient approximation (GGA). From this model, the surface energy is calculated and compared with experimental data to validate the accuracy of our calculation. The stacking fault energy, twin formation energy along with generalized planar fault energy are calculated to explain the formation tendency of stacking fault and twinning. The findings have uncovered the mechanism of nacre's self-stiffening properties and provided a new route for designing strong and tough ceramic materials.

LanguageEnglish (US)
Title of host publicationProceedings of the American Society for Composites - 30th Technical Conference, ACS 2015
PublisherDEStech Publications
ISBN (Electronic)9781605952253
StatePublished - 2015
Event30th Annual Technical Conference of the American Society for Composites, ASC 2015 - East Lansing, United States
Duration: Sep 28 2015Sep 30 2015

Other

Other30th Annual Technical Conference of the American Society for Composites, ASC 2015
CountryUnited States
CityEast Lansing
Period9/28/159/30/15

Profile

Nacre
Stacking faults
Strain rate
Armor
Twinning
Ceramic materials
Interfacial energy
Probability density function
Toughness
Mechanical properties

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Liu, J., Li, X., & Qi, Y. (2015). Computational insights into high strain rate self-stiffening mechanism in nacre. In Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015 DEStech Publications.

Computational insights into high strain rate self-stiffening mechanism in nacre. / Liu, J.; Li, X.; Qi, Y.

Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015. DEStech Publications, 2015.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Liu, J, Li, X & Qi, Y 2015, Computational insights into high strain rate self-stiffening mechanism in nacre. in Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015. DEStech Publications, 30th Annual Technical Conference of the American Society for Composites, ASC 2015, East Lansing, United States, 9/28/15.
Liu J, Li X, Qi Y. Computational insights into high strain rate self-stiffening mechanism in nacre. In Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015. DEStech Publications. 2015.
Liu, J. ; Li, X. ; Qi, Y./ Computational insights into high strain rate self-stiffening mechanism in nacre. Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015. DEStech Publications, 2015.
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