Fatihhi S J, Harun M N, Abdul Kadir Mohammed Rafiq, Abdullah Jaafar, Kamarul T, Öchsner Andreas, Syahrom Ardiyansyah
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Johor Baharu, Malaysia.
Sport Innovation and Technology Centre (SITC), Institute of Human Centered Engineering (IHCE), Universiti Teknologi Malaysia, Johor Baharu, Malaysia.
Ann Biomed Eng. 2015 Oct;43(10):2487-502. doi: 10.1007/s10439-015-1305-8. Epub 2015 Apr 1.
Fatigue assessment of the trabecular bone has been developed to give a better understanding of bone properties. While most fatigue studies are relying on uniaxial compressive load as the method of assessment, in various cases details are missing, or the uniaxial results are not very realistic. In this paper, the effect of three different load histories from physiological loading applied on the trabecular bone were studied in order to predict the first failure surface and the fatigue lifetime. The fatigue behaviour of the trabecular bone under uniaxial load was compared to that of multiaxial load using a finite element simulation. The plastic strain was found localized at the trabecular structure under multiaxial load. On average, applying multiaxial loads reduced more than five times the fatigue life of the trabecular bone. The results provide evidence that multiaxial loading is dominated in the low cycle fatigue in contrast to the uniaxial one. Both bone volume fraction and structural model index were best predictors of failure (p < 0.05) in fatigue for both types of loading, whilst uniaxial loading has indicated better values in most cases.
对松质骨进行疲劳评估，有助于更好地了解骨特性。虽然大多数疲劳研究依赖单轴压缩载荷作为评估方法，但在各种情况下，细节缺失，或者单轴结果不太现实。本文研究了三种不同的生理载荷历史对松质骨的影响，以预测首次失效表面和疲劳寿命。通过有限元模拟，将松质骨在单轴载荷下的疲劳行为与多轴载荷下的疲劳行为进行了比较。发现多轴载荷下塑性应变集中在小梁结构处。平均而言，施加多轴载荷会使松质骨的疲劳寿命降低五倍以上。结果表明，与单轴载荷相比，多轴载荷在低周疲劳中起主导作用。对于两种载荷类型，骨体积分数和结构模型指数都是疲劳失效的最佳预测指标（p < 0.05），而在大多数情况下，单轴载荷显示出更好的值。
