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    Duration of Constant and Ramp Loading on Strength of Wood

    Source: Journal of Engineering Mechanics:;1997:;Volume ( 123 ):;issue: 005
    Author:
    Jen Y. Liu
    ,
    Erwin L. Schaffer
    DOI: 10.1061/(ASCE)0733-9399(1997)123:5(489)
    Publisher: American Society of Civil Engineers
    Abstract: We present an analysis of time-dependent strength of cellulosic and polymeric materials under ramp loading. The analysis is based on the Reiner-Weissenberg thermodynamic theory of strength in conjunction with a nonlinear mechanical model. The strength model system has been applied with satisfactory results to predict rupture behavior of polymers and wood polymer composites under constant loading. It has the peculiar features of predicting (1) The upper stress limit at which the material ruptures immediately upon application of load; and (2) the lower stress limit at which the material can sustain the load indefinitely without rupture. Procedures to evaluate the model parameters based on existing constant and ramp-loading test data of Douglas-fir beams are demonstrated. Although the model parameters are defined physical quantities, their accuracy can be improved because of the complex material creep characteristics and mechanical properties.
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      Duration of Constant and Ramp Loading on Strength of Wood

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    contributor authorJen Y. Liu
    contributor authorErwin L. Schaffer
    date accessioned2017-05-08T22:38:19Z
    date available2017-05-08T22:38:19Z
    date copyrightMay 1997
    date issued1997
    identifier other%28asce%290733-9399%281997%29123%3A5%28489%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/84602
    description abstractWe present an analysis of time-dependent strength of cellulosic and polymeric materials under ramp loading. The analysis is based on the Reiner-Weissenberg thermodynamic theory of strength in conjunction with a nonlinear mechanical model. The strength model system has been applied with satisfactory results to predict rupture behavior of polymers and wood polymer composites under constant loading. It has the peculiar features of predicting (1) The upper stress limit at which the material ruptures immediately upon application of load; and (2) the lower stress limit at which the material can sustain the load indefinitely without rupture. Procedures to evaluate the model parameters based on existing constant and ramp-loading test data of Douglas-fir beams are demonstrated. Although the model parameters are defined physical quantities, their accuracy can be improved because of the complex material creep characteristics and mechanical properties.
    publisherAmerican Society of Civil Engineers
    titleDuration of Constant and Ramp Loading on Strength of Wood
    typeJournal Paper
    journal volume123
    journal issue5
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)0733-9399(1997)123:5(489)
    treeJournal of Engineering Mechanics:;1997:;Volume ( 123 ):;issue: 005
    contenttypeFulltext
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