Continuum damage interactions between tension and compression in osteonal bone

Mirzaali, Mohammad J.; Bürki, Alexander; Schwiedrzik, Jakob; Zysset, Philippe K.; Wolfram, Uwe (2015). Continuum damage interactions between tension and compression in osteonal bone. Journal of the mechanical behavior of biomedical materials, 49, pp. 355-369. Elsevier 10.1016/j.jmbbm.2015.05.007

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Skeletal diseases such as osteoporosis impose a severe socio-economic burden to ageing societies. Decreasing mechanical competence causes a rise in bone fracture incidence and mortality especially after the age of 65 y. The mechanisms of how bone damage is accumulated under different loading modes and its impact on bone strength are unclear. We hypothesise that damage accumulated in one loading mode increases the fracture risk in another. This study aimed at identifying continuum damage interactions between tensile and compressive loading modes. We propose and identify the material constants of a novel piecewise 1D constitutive model capable of describing the mechanical response of bone in combined tensile and compressive loading histories. We performed several sets of loading–reloading experiments to compute stiffness, plastic strains, and stress-strain curves. For tensile overloading, a stiffness reduction (damage) of 60% at 0.65% accumulated plastic strain was detectable as stiffness reduction of 20% under compression. For compressive overloading, 60% damage at 0.75% plastic strain was detectable as a stiffness reduction of 50% in tension. Plastic strain at ultimate stress was the same in tension and compression. Compression showed softening and tension exponential hardening in the post-yield regime. The hardening behaviour in compression is unaffected by a previous overload in tension but the hardening behaviour in tension is affected by a previous overload in compression as tensile reloading strength is significantly reduced. This paper demonstrates how damage accumulated under one loading mode affects the mechanical behaviour in another loading mode. To explain this and to illustrate a possible implementation we proposed a theoretical model. Including such loading mode dependent damage and plasticity behaviour in finite element models will help to improve fracture risk analysis of whole bones and bone implant structures.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB

UniBE Contributor:

Mirzaalimazandarani, Mohammadjavad; Bürki, Alexander; Schwiedrzik, Johann Jakob; Zysset, Philippe and Wolfram, Uwe

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

1751-6161

Publisher:

Elsevier

Language:

English

Submitter:

Philippe Zysset

Date Deposited:

14 Dec 2015 11:55

Last Modified:

14 Dec 2015 11:55

Publisher DOI:

10.1016/j.jmbbm.2015.05.007

PubMed ID:

26093346

BORIS DOI:

10.7892/boris.74244

URI:

https://boris.unibe.ch/id/eprint/74244

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