Energy-Based Failure Criterion for Wood

Recent research into the strength of dimension lumber has led to the development of an alternative failure criterion based on the notion of a critical energy density for the material. The strength of wood is known to be related to the duration of an applied load; however, duration-of-load effects ca...

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Bibliographic Details
Published in:Journal of materials in civil engineering 1994-11, Vol.6 (4), p.578-594
Main Authors: Philpot, Timothy A, Fridley, Kenneth J, Rosowsky, David V
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Exact sciences and technology
Materials
TECHNICAL PAPERS
Wood
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Summary:Recent research into the strength of dimension lumber has led to the development of an alternative failure criterion based on the notion of a critical energy density for the material. The strength of wood is known to be related to the duration of an applied load; however, duration-of-load effects cannot be explained within the context of a theoretical failure criterion based solely on stress. Conversely, a theoretical relationship between ultimate stress and load duration can be demonstrated when an energy-based failure criterion is combined with a viscoelastic stress-strain model. In the present paper, the theoretical equations expressing the relationship between ultimate stress and load duration are derived for constant intensity loads. Two related energy-based failure models are proposed and investigated. Using available experimental data as a reference, a numerical experiment is conducted to compare the two energy models with a widely used damage accumulation model.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)0899-1561(1994)6:4(578)