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Experimental evaluation of fracture properties of bovine hip cortical bone using elastic–plastic fracture mechanics
Bio-Medical Materials and Engineering ( IF 1 ) Pub Date : 2021-08-03 , DOI: 10.3233/bme-211220
Waseem Ur Rahman 1, 2 , Rafiullah Khan 1 , Noor Rahman 1 , Ziyad Awadh Alrowaili 3 , Baseerat Bibi 4 , Najm Us Sama 5
Affiliation  

BACKGROUND:Understanding the fracture mechanics of bone is very important in both the medical and bioengineering field. Bone is a hierarchical natural composite material of nanoscale collagen fibers and inorganic material. OBJECTIVE:This study investigates and presents the fracture toughness of bovine cortical bone by using elastic plastic fracture mechanics. METHODS:The J-integral was used as a parameter to calculate the energies utilized in both elastic deformation (Jel) and plastic deformation (Jpl) of the hipbone fracture. Twenty four different types of specimens, i.e. longitudinal compact tension (CT) specimens, transverse CT specimens, and also rectangular unnotched specimens for tension in longitudinal and transverse orientation, were cut from the bovine hip bone of the middle diaphysis. All CT specimens were prepared according to the American Society for Testing and Materials (ASTM) E1820 standard and were tested at room temperature. RESULTS:The results showed that the average total J-integral in transverse CT fracture specimens is 26% greater than that of longitudinal CT fracture specimens. For longitudinal-fractured and transverse-fractured cortical specimens, the energy used in the elastic deformation was found to be 2.8–3 times less than the energy used in the plastic deformation. CONCLUSION:The findings indicate that the overall fracture toughness measured using the J-integral is significantly higher than the toughness calculated by the stress intensity factor. Therefore, J-integral should be employ to compute the fracture toughness of cortical bone.

中文翻译:

弹塑性断裂力学对牛髋骨皮质断裂特性的实验评价

背景:了解骨的断裂力学在医学和生物工程领域都非常重要。骨是纳米级胶原纤维与无机材料的分层天然复合材料。目的:本研究采用弹塑性断裂力学研究和呈现牛皮质骨的断裂韧性。方法:以J积分为参数,计算髋骨骨折的弹性变形(Jel)和塑性变形(Jpl)所使用的能量。从中骨干的牛髋骨切取二十四种不同类型的标本,即纵向紧凑拉伸(CT)标本、横向CT标本以及用于纵向和横向拉伸的矩形无缺口标本。所有 CT 试样均根据美国材料与试验协会 (ASTM) E1820 标准制备,并在室温下进行测试。结果:结果显示,横向CT骨折标本的平均总J积分比纵向CT骨折标本大26%。对于纵向断裂和横向断裂的皮质试样,发现弹性变形所用的能量比塑性变形所用的能量小 2.8-3 倍。结论:研究结果表明,使用 J 积分测量的整体断裂韧性明显高于通过应力强度因子计算的韧性。因此,应采用J积分来计算皮质骨的断裂韧性。
更新日期:2021-08-07
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