Fracture, fatigue and indentation behavior of pyrolytic carbon for biomedical applications

R. O. Ritchie, R. H. Dauskardt, W. W. Gerberich, A. Strojny, E. Lilleodden

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The fracture, fatigue and indentation properties of pyrolytic carbon, both as a monolithic material and as a coating on a graphite substrate, are described in light of its use for biomedical implant applications, specifically for the manufacture of mechanical heart valve prostheses. From the perspective of determining properties that are important for the prediction of safe structural lifetimes in such prostheses, it is found that by traditional engineering standards, pyrolytic carbon has low damage tolerance, i.e., fracture toughness values between 1 and 3 MPa√m and susceptibility to subcritical crack growth by both cyclic fatigue and stress-corrosion cracking (static fatigue). Subcritical crack-growth rates are evaluated in simulated physiological environments for both through-thickness 'long' cracks, and for physically 'small' surface cracks, the latter measurements being performed for cracks initiated at hardness indents. The unusual deformation characteristics of indentation in pyrolytic carbon are described based on instrumented microhardness indentation and scanning probe microscopy (AFM/STM) studies.

Original languageEnglish (US)
Pages (from-to)229-254
Number of pages26
JournalMaterials Research Society Symposium - Proceedings
Volume383
StatePublished - Dec 1 1995

Fingerprint

indentation
Indentation
cracks
Fatigue of materials
Cracks
Carbon
carbon
Crack propagation
Heart valve prostheses
Scanning probe microscopy
Damage tolerance
Graphite
heart valves
Stress corrosion cracking
Prosthetics
stress corrosion cracking
Microhardness
surface cracks
Fracture toughness
fracture strength

Cite this

Ritchie, R. O., Dauskardt, R. H., Gerberich, W. W., Strojny, A., & Lilleodden, E. (1995). Fracture, fatigue and indentation behavior of pyrolytic carbon for biomedical applications. Materials Research Society Symposium - Proceedings, 383, 229-254.

Fracture, fatigue and indentation behavior of pyrolytic carbon for biomedical applications. / Ritchie, R. O.; Dauskardt, R. H.; Gerberich, W. W.; Strojny, A.; Lilleodden, E.

In: Materials Research Society Symposium - Proceedings, Vol. 383, 01.12.1995, p. 229-254.

Research output: Contribution to journalArticle

Ritchie, RO, Dauskardt, RH, Gerberich, WW, Strojny, A & Lilleodden, E 1995, 'Fracture, fatigue and indentation behavior of pyrolytic carbon for biomedical applications', Materials Research Society Symposium - Proceedings, vol. 383, pp. 229-254.
Ritchie, R. O. ; Dauskardt, R. H. ; Gerberich, W. W. ; Strojny, A. ; Lilleodden, E. / Fracture, fatigue and indentation behavior of pyrolytic carbon for biomedical applications. In: Materials Research Society Symposium - Proceedings. 1995 ; Vol. 383. pp. 229-254.
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