Abstract
Tear fracture strength of 5083 aluminum alloy plate was studied experimentally for the test temperatures ranging from 4K to 473K. The total absorbed energy during the tear fracture shows N-letter type changes with respect to the test temperatures indicating the presence of three distinct temperature regions. In the higher and lower temperature regions, the temperature dependences of the total absorbed energy are negative, while they are positive in the medium temperature region. The temperature dependence of the absorbed energy for the crack propagation is substantially the same as that of the total absorbed energy. The total absorbed energy of the specimen L in which the crack propagation direction was vertical to the rolling direction, is higher by about 10 to 20% than that of LT specimen in which the crack propagation direction was parallel to the rolling direction. The tear fracture strength increases linearly with 0.2% proof stress measured by tensile test. No clear linearlity is observed, however, between the ultimate tensile strength and tear fracture strength. A laminated fracture in the tear fractured surface is observed only at 4K.
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