title: Postfailure modulus strongly affects microcracking and mechanical property change in human iliac cancellous bone: a study using a 2D nonlinear finite element method.
abstract: A two-dimensional (2D) finite element (FE) method was used to estimate the ability of bone tissue to sustain damage as a function of postfailure modulus. Briefly, 2D nonlinear compact-tension FE models were created from quantitative back-scattered electron images taken of human iliac crest bone specimens. The effects of different postfailure moduli on predicted microcrack propagation were examined. The 2D FE models were used as surrogates for real bone tissues. The crack number was larger in models with higher postfailure modulus, while mean crack length and area were smaller in these models. The rate of stiffness reduction was greater in the models with lower postfailure modulus. Hence, the current results supported the hypothesis that hard tissue postfailure properties have strong effects on bone microdamage morphology and the rate of change in apparent mechanical properties.
authors.affiliation: Lawrence J. Ellison Musculoskeletal Research Center, University of California Davis Medical Center, Room 2000, Research Facility I, 4635 Second Avenue, Sacramento, CA 95817, USA. x10wang@gmail.com
authors.forename: Xiang
authors.initials: X
authors.lastname: Wang
authors.forename: Roger R
authors.initials: RR
authors.lastname: Zauel
authors.forename: David P
authors.initials: DP
authors.lastname: Fyhrie
mesh_terms: D019245:Compressive Strength; D003198:Computer Simulation; D055119:Elastic Modulus / Q000502:physiology; D020342:Finite Element Analysis; D050723:Fractures, Bone / Q000503:physiopathology*; D006801:Humans; D007085:Ilium / Q000293:injuries* / Q000503:physiopathology*; D008954:Models, Biological; D017711:Nonlinear Dynamics; D013314:Stress, Mechanical; D013718:Tensile Strength