Browsing by Author "Brown, KR"

Now showing 1 - 7 of 7
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    Acoustic emission and failure prediction for pressurisation experiments on helicopter air bottles
    (Australian Atomic Energy Commission., 1980-11) Brown, KR; Harris, RW
    Two spherical high pressure bottles of high-tensile steel were pressurised to destruction to evaluate acoustic emission monitoring as a non-destructive test on similar bottles. One bottle was tested with an artificially introduced defect of sufficient size to reduce the failure pressure to the proof-test pressure; the other contained no flaws. In neither bottle was sufficient acoustic emission detected to enable monitoring to be of value for non-destructive testing.
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    Acoustic emission monitoring of a steam receiver pressurised to failure.
    (Australian Atomic Energy Commission, 1978-04) Brown, KR; Harris, RW; Wood, BRA
    Australian Atomic Energy Commission and the Australian Welding Research Association have conducted acoustic emission monitoring of a large defective pressure vessel during pressurisation to failure. Using acoustic emission source location equipment, it was possible to locate, in real time, areas of high activity. Later, fractographic examination of the failed vessel indicated that failure had initiated at the area of highest activity and this area was identified well before failure occurred.
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    Acoustic emission monitoring of a steel bifurcate at Dartmouth Dam
    (Australian Atomic Energy Commission, 1978-02) Harris, RW; Brown, KR; Wood, BRA
    At the invitation of the State Rivers and Water Supply Commission of Victoria, the Australian Atomic Energy Commission conducted acoustic emission monitoring during the proof testing of a large steel bifurcate on the outlet of the Dartmouth Dam under construction on the Mitta Mitta River in Victoria. No indications of defects or local yielding were recorded during pressure testing by the acoustic emission equipment. This result was supported by extensive strain gauging which had been conducted by the Snowy Mountains Engineering Corporation.
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    The effect of axial flaws on the burst pressure of stainless steel tubing
    (International Institute of Welding, 1976-08-23) Kelly, PM; Brown, KR; Smith, PD; Zybenko, B
    A study has been made of the failure of 321 stainless steel tubes containing artificial axial defects. The data agree well with mathematical analyses that are available in the literature to predict the effect of defects on the failure stress of pressurised tubes fabricated from tough materials. Satisfactory agreement was obtained although the experimental pressurisations were performed without an axial stress component, whereas the analyses are normally used for structures in which an axial stress is developed.
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    The fracture behavious of 410 stainless steel plate
    (International Institute of Welding, 1976-08-23) Brown, KR
    A study is reported of the influence if delamination in a 410 (ferritic) stainless steel rolled plate on the orientation dependence of the resistance to fracture of Schnadt specimens during impact testing. Delamination in this material is favoured by the pressure of carbide precipitations on prior austenite grain boundaries. When the crack pane was parallel to the rolled surface, very low impact energies were recorded below the transition temperature (140°). Below 20°, the fracture was predominately intergranular. However, with increasing temperature, the fracture exhibited greater amounts of transgranular cracking. This latter change continued until the transition temperature was reached where the fracture was completely ductile. When the crack propagated across the plate width and normal to the rolled surface, the transition temperature was lowered to approximately 20° because delamination favoured plane stress conditions. The transition temperature was further lowered to less than -40° when the crack propagated through the plate thickness, again due to the effect of delamination. An increase in fracture energy at lower temperature can be attributed to the release of constraint by delamination, and to the difficulty of re-nucleating the crack at each delamination.
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    Studies of the effect of thickness on the fracture toughness of grade 300 maraging steel, part 1.
    (Australian Atomic Energy Commission, 1977-06) Smith, PD; Brown, KR
    A series of tests was carried out using the ASTM fracture toughness test standards as a basis to determine the variation in fracture toughness of maraging steel (grade 300) of thickness ranging from 10 to 1 mm. Although these standards are not strictly applicable to maraging steels of the lower thicknesses in this range, they yield a measure of fracture toughness which can be used to predict safe operating stresses for thin walled the structures. A maximum fracture toughness of approximately 90 MPa m was obtained at 1 mm, the minimum thickness examined. The plane strain fracture toughness was approximately 58 MPa m at thicknesses greater than 5 mm.
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    Studies of the effect of thickness on the fracture toughness of grade 300 maraging steel, part 2.
    (Australian Atomic Energy Commission, 1977-06) Duke, C; Brown, KR
    The fracture toughness of samples of grade 300 maraging steel sheet of varying thickness was determined in tensile test specimens containing a spark machined slot. A maximum fracture toughness of 105 MPa m2 was obtained in specimens in the thickness range 0.75 to 1.25 mm. The fracture surfaces of specimens over 0.5 mm thick contained both plane stress and plane strain areas, but below 0.5 mm fracture was entirely under plane stress conditions.