Browsing by Author "Dürkop, Detlev"

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    Strength tests of flat glass by means of four-point bending
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1994) Blank, Kurt; Dürkop, Detlev; Durchholz, Michael; Grüters, Hugo; Helmich, Gerd; Senger, Wolfgang
    The strength of flat glass, especially of tempered or heat-strengthened flat glass, can be determined by means o f the four-point bending method according to a German standard. The strength of a specimen is defined as the tensile stress in its central part at failure, and this failure stress is calculated using the Bernoulli beam bending theory. However, the basic conditions o f this theory are not fulfilled in the experiments. Deviations from the method o f evaluation, as specified in the standard, are pointed out in this paper using a nonlinear theory of shells; the numerical calculations were confirmed by experiments.