J
II fracture testing of a plastically deforming material |
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Authors: | Leslie Banks-Sills Dov Sherman |
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Affiliation: | (1) The Eda and Jaime David Dreszer Fracture Mechanics Laboratory, Department of Mechanics, Materials and Structures, Faculty of Engineering, Tel Aviv University, 69978 Ramat Aviv, Israel |
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Abstract: | A compact model II fracture specimen was previously analyzed and employed to determine the mode II fracture toughness K
IIc
, of perspex. In employing this specimen for a more ductile material such as aluminium, it was observed that the load vs. crack sliding displacement record becomes nonlinear for small loads. Thus, concepts of linear elastic fracture mechanics cannot be employed. To this end, the specimen was calibrated for J-integral testing, so that J
IIc
mesurements can be performed.In this study, mode I and II tests are carried out on an aircraft aluminium alloy, AI 7075-T7351. First, standard K
Ic
tests are performed leading to a value of 27.9 15-1 which would be equivalent to a J
Ic
of 10.7 kN/m. Then standard J
Ic
tests are carried out on this material with specimen thicknesses, of 5, 7.5 and 9.9 mm, leading to an average J
Ic
value of 10.5 kN/m. Methods for J
II testing are proposed; a series of specimens of six thicknesses between 5 and 16 mm are employed for testing. An average J
IIc
value was found to be 40.2 kN/m which yields a K
IIc
value of 54.1 15-2. Thus, K
IIc
is seen to be approximately twice that of K
Ic
for this material. |
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Keywords: | |
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