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    Author(s): Shun Cheng; T. Gerhardt
    Date: 1980
    Source: Res. Pap. FPL-RP-375. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 26 pages
    Publication Series: Research Paper (RP)
    Station: Forest Products Laboratory
    PDF: View PDF  (517 KB)

    Description

    This paper considers laminated beams with layers of different isotropic or orthotropic materials fastened together by thin adhesives. The stresses that result from subjecting each component layer of the beam to different temperature or moisture stimuli which may also vary along the length of the beam, are calculated. Two-dimensional elasticity theory is used so that a wide range of problems, such as that of beams composed of layers of orthotropic materials like wood, can be studied, and accurate distributions of normal and shear stresses obtained. The stress intensity along the bearing surfaces of the layers of the beam is of particular importance because it is responsible for delamination failures of laminated structural elements. The distributions of inter-laminar normal and shear stresses measured along the longitudinal axis of the beam indicate that high stress intensity occurs in the end zones of the beam. Thus, delamination failure, when it occurs, will start at the ends of the beam.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Cheng, Shun; Gerhardt, T. 1980. Laminated beams of isotropic or orthotropic materials subjected to temperature change. Res. Pap. FPL-RP-375. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 26 pages

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    Keywords

    Isotropic materials, orthotropic materials, laminated beams, temperature

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