Fracture strength evaluation of titanium alloys using modified average stress criterion

Structural integrity procedures were used to demonstrate the fitness for the purpose of engineering components transmitting loads. The prediction of the fracture strength of titanium alloys containing sharp notches through the damage model depends on the un-notched strength and the critical length o...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2013-04, Vol.23 (4), p.1072-1079
Main Authors: JOHN, H. BRIGHTON ISAAC, CHRISTOPHER, T.
Format: Article
Language:English
Subjects:
center crack tensile specimen
Criteria
Damage
failure assessment diagram
Fracture mechanics
Fracture strength
Mathematical models
Notches
stress criterion
Stresses
titanium alloys
Titanium base alloys
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Summary:Structural integrity procedures were used to demonstrate the fitness for the purpose of engineering components transmitting loads. The prediction of the fracture strength of titanium alloys containing sharp notches through the damage model depends on the un-notched strength and the critical length of the damage zone ahead of the notch. In general, the critical length of the damage zone depends on the material, specimen, and size of the sharp notch. Modifications were made in one of the stress fracture criteria known as the average stress criterion for accurate prediction of notched tensile strength of titanium alloy specimen containing sharp notches. To examine the adequacy of these modifications, fracture data of center-cracked titanium alloys with various thicknesses are considered. The notched (fracture) strength estimates are found to be close to the test results. The modified average stress criterion is very simple to predict the notched tensile strength.
ISSN:1003-6326
DOI:10.1016/S1003-6326(13)62568-6