کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
874906 | 910354 | 2006 | 9 صفحه PDF | دانلود رایگان |

Bone is an anisotropic material with a hierarchical structure consisting of organic matrix, minerals and water. Fracture toughness (KC)(KC) has been shown to be a good index to assess the mechanical performance of bone. A chevron-notched (CN) beam test, a standard fracture mechanics test successfully applied to many other materials, was used to determine the transverse-direction fracture toughness in manatee rib and bovine femur cortical bone. Although human and bovine bone has been well studied, there is virtually no information on the toughness of manatee rib bone. As a biological material, manatee rib is interesting for study in that it is a highly mineralized bone. Three major advantages of the CN specimen test are: (1) it is easier to reach plane strain condition; (2) there is no fatigue-precracking needed; and (3) it is relatively easy to produce stable crack propagation before catastrophic fracture. The fracture toughness values of manatee rib and bovine femur were measured to be 4.5±0.5 MPa m1/2 and 5.8±0.5 MPa m1/2, respectively. Based on the microstructures shown in SEM images, two features that contributed to the greater fracture toughness of bovine femur were identified as greater osteon density and lesser porosity.
Journal: Journal of Biomechanics - Volume 39, Issue 6, 2006, Pages 1066–1074