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  • 1
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Study how to Determine a More Realistic Stress Distribution in Flexed Beams by Using Data Compiled in Tension and Compression Test of the Same Plastic MaterialAn improved description of the behaviour of thermoplastic materials under bending load is derived. The necessary experiments and their results are described and discussed.Tests were run with a four-point-support. Shear strain on the middle of the deflected beam due to the supports was minimized by variation of the distance of the supports.The strain was measured as a function of the thickness of the beam and found to be linear. The beam now was regarded as being built up out of single fibres, each of them uniaxially strained by tension or compression respectively.The results of uniaxial tension and compression tests then were transfered to this deflected beam free of shearing stresses and a non-linear strain-distribution was obtained over the thickness of the beam.From these experimental strain-values a load-capacity-excess was computed, which could even be enlarged, if the different velocities in strain of different fibres were taken into account.Furtheron is shown that beams of thermoplastic materials under flexural load can resist more tensile strain than under uniaxial tension.
    Notes: Die Arbeit beschäftigt sich mit der Ermittlung einer wirklichkeitsnäheren Beanspruchungsverteilung in biegebelasteten Plastomerbauteilen durch Übertragung einachsiger Zug- und Druckversuche auf die Biegung.Hierzu wurden einachsige Zug- und Druckversuche an polymeren Werkstoffen vorgenommen.Die Versuchsergebnisse wurden theoretisch auf die Biegebeanspruchung übertragen und mit der tatsächlich auftretenden Spannungsverteilung korreliert.Weiter wurden die unterschiedlichen Faserdehngeschwindigkeiten bei der Biegung dadurch erfaßt, daß Zug- bzw. Druckversuche mit verschiedenen Abzugsgeschwindigkeiten gefahren wurden die mit den Faserdehngeschwindigkeiten korrespondierten. Die Übertragung auf den Biegeversuch führte zu einer konstruktiven Aussage für die Werkstoffausnutzung.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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