Reduction in adhesive shear strains at the ends of bonded reinforcements /
A mathematical model is presented which defines the adhesive shear strain distribution for an adherend with bonded multilayer reinforcements which are stepped at their ends. In this one-dimensional formulation each step is allowed to be of different thickness and modulus, and of variable step length...
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| Main Author: | |
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| Corporate Authors: | , |
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| Format: | Book |
| Language: | English |
| Published: |
Melbourne :
DSTO Aeronautical and Maritime Research Laboratory,
1997.
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| Series: | Research report (Defence Science and Technology Organisation (Australia)) ;
DSTO-RR-0115. |
| Subjects: |
| Summary: | A mathematical model is presented which defines the adhesive shear strain distribution for an adherend with bonded multilayer reinforcements which are stepped at their ends. In this one-dimensional formulation each step is allowed to be of different thickness and modulus, and of variable step length. A procedure is then given to improve the design of such reinforcements through minimising the peak adhesive shear strain which typically occurs near their stepped ends. It is shown that to achieve a 20% reducation in peak adhesive shear strain for a typical stepped patch consisting of unidirectional laminae, the first step adjacent to the patch end needs to be much longer that the remaining steps. For the case where cross-ply laminae are used in conjunction with unidirectional laminae, the maximum shear strain in the adhesive layer can be reduced by about 60% The results also indicate that reduced pear adhesive shear strains lead to a smoother transition of load from the plate to the patch. This suggests thata patch design which minimises peak adhesive shear strain will also reduce the undesirable stress concentration in the repaired structure, outside the patched region. |
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| Item Description: | "AR-010-330" -- Verso t.p. "September 1997" -- Verso t.p. "January 1998" -- Back cover. |
| Physical Description: | 26 p. : ill., port. ; 30 cm. |
| Bibliography: | Includes bibliographical references (p. 16) |