Augmentation of low frequency damping via hydrogen-doping in a hybrid shape memory alloy composite

Shashank Nagrale, Avery D. Brown, Charles E. Bakis, Reginald F. Hamilton

Research output: Contribution to journalArticlepeer-review


Carbon fiber reinforced polymer (CFRP) composites hybridized with hydrogen-doped NiTi wires can be used to design structures requiring high stiffness and high damping in the low frequency range, such as helicopter blades. The current work investigates aging and hydrogen-doping for high damping without hydrogen embrittlement. We establish a hydrogenation treatment that (i) results in a response that is repeatable in the martensitic phase and after exposure to composite processing temperatures and (ii) increases the loss factor in NiTi wires by nearly 470%. By embedding H-doped wires exhibiting the highest damping into the interlayers of a [0/±45]s carbon/epoxy laminate at a volume fraction of 0.1, the hybrid NiTi-CFRP composite loss factor increases by 170%. The measured dynamic properties were found to be close to micromechanical predictions based on the properties of the NiTi and CFRP.

Original languageEnglish (US)
Pages (from-to)1018-1027
Number of pages10
JournalJournal of Intelligent Material Systems and Structures
Issue number8
StatePublished - May 2022

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Mechanical Engineering


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