Lessons from the Ocean : Whale Baleen Fracture Resistance

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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  • Tarah N. Sullivan
  • Andrei Pissarenko
  • Alireza Zaheri
  • Horacio D. Espinosa
  • Marc A. Meyers


Original languageEnglish
Article number1804574
Journal / PublicationAdvanced Materials
Issue number3
Publication statusPublished - 18 Jan 2019
Externally publishedYes


Whale baleen is a keratin-based biological material; it provides life-long (40–100 years) filter-feeding for baleen whales in place of teeth. This study reveals new aspects of the contribution of the baleen's hierarchical structure to its fracture toughness and connects it to the unique performance requirements, which require anisotropy of fracture resistance. Baleen plates are subjected to competing external effects of hydration and varying loading rates and demonstrate a high fracture toughness in transverse loading, which is the most important direction in the filtering function; in the longitudinal direction, the toughness is much lower since delamination and controlled flexure are expected and desirable. The compressive strength is also established and results support the fracture toughness measurements: it is also highly anisotropic, and exhibits a ductile-to-brittle transition with increasing strain rate in the dry condition, which is absent in the hydrated condition, conferring impact resistance to the baleen. Using 3D-printing prototypes that replicate the three principal structural features of the baleen plate (hollow medulla, mineralized tubules, and sandwich-tubular structure) are created, and the role of its structure in determining its mechanical behavior is demonstrated. These findings suggest new bioinspired engineering materials.

Research Area(s)

  • baleen, fracture toughness, impact resistance, keratin, sandwich-tubular structure, whale

Bibliographic Note

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Citation Format(s)

Lessons from the Ocean: Whale Baleen Fracture Resistance. / Wang, Bin; Sullivan, Tarah N.; Pissarenko, Andrei et al.
In: Advanced Materials, Vol. 31, No. 3, 1804574, 18.01.2019.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review