4 results for Conference item, 1980

  • Mechanical design of joints incorporating metal interlayers

    Kelly, Piaras; Hills, DA; Nowell, D (1989)

    Conference item
    The University of Auckland Library

    We undertake a theoretical study of the strength of a joint modelled as two rigid blocks (ceramic components) bonded by a thin, comparatively soft metal interlayer, loaded in tension. Slip-line field theory and the upper bound theorem enables us to suggest firm guidelines for the maximum thickness of the interlayer which enables the full strength of the ceramic to be achieved, by exploiting the constraint implicit in a thin layer. We go on to investigate the influence of flaws (poorly bonded regions) and show how a comparatively small region of poor adhesion (~5% debonding) can significantly reduce the strength of the joint. Quantitative information about the amount of de-bonding which can be tolerated in a particular configuration without loss of strength will be presented.

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  • Detection of thin tephra deposits in peat and organic lake sediments by rapid X-radiography and X-ray fluorescence techniques

    Lowe, David J.; Hogg, Alan G.; Hendy, C.H. (1981)

    Conference item
    University of Waikato

    This paper reports the application of the X-ray image process of X-radiography to unopened, small diameter organic sediment cores containing thin tephra deposits. Second, a rapid technique for detecting tephra layers in peat samples by X-ray fluorescence (XRF) analysis is described.

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  • Quaternary stratigraphy, landscape, and soils of the Hamilton Basin

    Kamp, Peter J.J.; Lowe, David J. (1981)

    Conference item
    University of Waikato

    The Hamilton Basin is a roughly oval shaped depression 80 km north to south and 40 km wide centered about Hamilton City (Fig. 1). The basin is surrounded by ranges up to 300 m high developed mainly in Mesozoic basement strata. The physiographic basin is essentially a fault bounded basement depression of Late Tertiary and Pleistocene age. Throughout the Quaternary this basin has been a receptacle of terrestrial sedimentation; the materials have derived mainly from extrabasin sources and principally the Central Volcanic Region to the southeast. In addition, materials have been derived from erosion of the bounding ranges, and Coromandel Peninsula. The last major depositional episode involved flood deposit s of the Taupo Pumice. The present landscape has evolved through several episodes of deposition and incision. During the excursion it is intended to show the participants exposures of the major Quaternary units of basin infilling, and some aspects of the landscape and the soil pattern, within the environs of Hamilton City. The standard geological reference covering the geology of Hamilton Basin is New Zealand Geological Survey Bulletin 88 (Kear & Schofield, 1978) . The surface features and soil pattern of the basin are succinctly covered by McCraw (1967) and Bruce (1979).

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  • Late Quaternary tephras in the Hamilton Basin, North Island, New Zealand

    Lowe, David J. (1981)

    Conference item
    University of Waikato

    This paper summarises the occurrence and distribution of late Quaternary tephras in the Hamilton (Middle Waikato) Basin and outlines a model to explain the pattern of soils formed from them. The collaborative work currently in progress on paleoecological aspects of the late Otiran - Aranuian history of the area is also reported.

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