The effect of specimen thickness on the experimental characterization of critical crack-tip-opening angle in 2024-T351 aluminum alloy

2003 ◽  
Vol 70 (3-4) ◽  
pp. 443-456 ◽  
Author(s):  
Samer Mahmoud ◽  
Kevin Lease
Keyword(s):  
Aluminum Alloy ◽  
Crack Tip ◽  
Opening Angle ◽  
Specimen Thickness ◽  
Experimental Characterization ◽  
Critical Crack ◽  
Crack Tip Opening Angle ◽  
Crack Tip Opening

Effect of Specimen Thickness on Fracture Toughness of Bovine Patellar Cartilage

2003 ◽  
Vol 125 (6) ◽  
pp. 927-929 ◽  
Author(s):  
D. J. Adams ◽  
K. M. Brosche ◽  
J. L. Lewis
Keyword(s):  
Mechanical Property ◽  
Fracture Toughness ◽  
Articular Cartilage ◽  
Fracture Behavior ◽  
Crack Tip ◽  
Opening Angle ◽  
Specimen Thickness ◽  
Patellar Cartilage ◽  
Crack Tip Opening Angle ◽  
Crack Tip Opening

Fracture toughness and crack tip opening angle were measured for bovine patellar cartilage using modified single-edged notch specimens of two thicknesses. There was no difference in fracture toughness between thin (0.7 mm) versus relatively thick (2.7 mm) specimens, but the crack tip opening angle at initiation of crack propagation was larger for the thin specimens (106 deg) than for the thick specimens (70 deg). Fracture toughness of the bovine patellar cartilage 1.03kJ/m2 was not statistically different than that reported previously for canine patellar cartilage 1.07kJ/m2 employing the same methods. Large variation in measurements for both bovine and canine cartilage are in part attributable to variation between individual animals, and are consistent with variation in other mechanical property measurements for articular cartilage. The observed reduction in crack tip opening angle with increased specimen thickness is consistent with behavior of some engineering materials, and demonstrates that specimen thickness influences fracture behavior for bovine patellar cartilage.

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