Failure modelling of trabecular bone using a non-linear combined damage and fracture voxel finite element approach
Failure modelling of trabecular bone using a non-linear combined damage and fracture voxel finite element approach
复制标题
DOI：
10.1007/s10237-012-0394-7
复制
发表时间：
2013-04-01
影响因子：
3.5
通讯作者：
McHugh, Peter E.
中科院分区：
文献类型：
--
作者：
Harrison, Noel M.;McDonnell, Pat;McHugh, Peter E.
骨小梁组织失效可被认为由两个阶段组成：损伤和骨折；然而，大多数 3D 高分辨率骨小梁样本的失效分析仅限于损伤机制，即没有骨折。本研究旨在开发一种骨小梁计算模型，其中包含完全失效的明确表示，并结合了损伤标准、断裂标准、内聚力、不对称性和大变形能力。经过对测试样本的参数研究以及骨样本完全破坏的实验测试，羊椎骨小梁骨的不对称临界组织损伤和断裂应变被校准和验证为压缩损伤-1.16％，拉伸损伤0.69％，压缩骨折-2.91％和拉伸骨折1.98％。计算模型捕获了极限强度和极限强度后软化，并且还预测了单个支柱在弯曲和剪切方面的失效。这种建模方法结合了一个内聚参数，为在这种非线性几何和非线性本构属性分析工具中校准骨组织的延性-脆性行为提供了便利。最后，从小范围（正常每日载荷）到样本屈服、极限强度和最终强度软化，对组织损伤和组织断裂的全面积累进行了监测。
Trabecular bone tissue failure can be considered as consisting of two stages: damage and fracture; however, most failure analyses of 3D high-resolution trabecular bone samples are confined to damage mechanisms only, that is, without fracture. This study aims to develop a computational model of trabecular bone consisting of an explicit representation of complete failure, incorporating damage criteria, fracture criteria, cohesive forces, asymmetry and large deformation capabilities. Following parameter studies on a test specimen, and experimental testing of bone sample to complete failure, the asymmetric critical tissue damage and fracture strains of ovine vertebral trabecular bone were calibrated and validated to be compression damage -1.16 %, tension damage 0.69 %, compression fracture -2.91 % and tension fracture 1.98 %. Ultimate strength and post-ultimate strength softening were captured by the computational model, and the failure of individual struts in bending and shear was also predicted. This modelling approach incorporated a cohesive parameter that provided a facility to calibrate ductile-brittle behaviour of bone tissue in this non-linear geometric and non-linear constitutive property analyses tool. Finally, the full accumulation of tissue damage and tissue fracture has been monitored from range of small magnitude (normal daily loading) through to specimen yielding, ultimate strength and post-ultimate strength softening.