Design and identification of high performance steel alloys for structures subjected to underwater impulsive loading

Felix Latourte, Xiaoding Wei, Zechariah D. Feinberg, Alban de Vaucorbeil, Phuong Tran, Gregory B. Olson, Horacio D. Espinosa

Research output: Contribution to journalArticleResearchpeer-review

32 Citations (Scopus)

Abstract

Martensitic and austenitic steel alloys were designed to optimize the performance of structures subjected to impulsive loads. The deformation and fracture characteristics of the designed steel alloys were investigated experimentally and computationally. The experiments were based on an instrumented fluid-structure interaction apparatus, in which deflection profiles are recorded using a shadow Moiré technique combined with high speed imaging. Fractographic analysis and post-mortem thickness reduction measurements were also conducted in order to identify deformation and fracture modes. The computational study was based on a modified Gurson damage model able to accurately describe ductile failure under various loading paths. The model was calibrated for two high performance martensitic steels (HSLA-100 and BA-160) and an austenitic steel (TRIP-120). The martensitic steel (BA-160) was designed to maximize strength and fracture toughness while the austenitic steel (TRIP-120) was designed to maximize uniform ductility, in other words, to delay necking instability. The combined experimental-computational approach provided insight into the relationships between material properties (strength, uniform ductility, and post-necking ductility) and blast resistance of structures. In particular, the approach allowed identification of material/structure performances by identifying impulse-center deflection behavior and the impulse leading to panel fracture.

Original languageEnglish
Pages (from-to)1573-1587
Number of pages15
JournalInternational Journal of Solids and Structures
Volume49
Issue number13
DOIs
Publication statusPublished - 15 Jun 2012
Externally publishedYes

Keywords

  • Dynamic fracture
  • Fluid-structure interaction
  • High strength steels
  • Impulsive loading
  • Necking
  • TRIP steel
  • Underwater explosion

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