Abstract/Details

The analysis and design of adhesively bonded composite structures


2005 2005

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Abstract (summary)

Adhesively bonded structures offer an attractive alternative to the historically prevalent bolted/riveted approaches to joining load bearing elements. Adhesively bonded assemblies allow for a gradual transfer of load from one structural element to another and a reduction of stress concentrations arising from material discontinuities inherent to mechanical fastening methods.

Several fundamental questions remain regarding the behavior of axially loaded lap shear joints. These issues are: the underestimation of the adhesive layer stresses by the various canonical literature models, the existence and magnitude of longitudinal tensile stresses in the adhesive layer, the existence of stress singularities at the corners of adhesive layers, and the effectiveness of asymmetrically designed adherends for reduction of adhesive layer peel stresses.

To investigate these issues, a high-order approximate elasticity solution for the adhesive layer is developed. This linear elastic model satisfies all natural/essential boundary conditions and is continuous over the entire domain (including the sharp comers).

Using this adhesive model, we find that the axial tensile stresses are negligible and that the shear stress state does not vary through the thickness of the adhesive layer. It is also found that the literature models underestimate the adhesive peel stresses by nearly 10% due the plane-stress assumptions commonly invoked.

Parametric studies are performed for adhesively bonded composite beam and shell structures. Once the influences of all geometric and material stiffness parameters are ascertained, guidelines are proposed for improved joint designs to reduce adhesive layer peel stresses. Using these design guidelines, an evaluation of midplane asymmetric beam and shell adherend architectures is performed. Improved beam adherend architectures and shell adherend architectures are identified.

Indexing (details)


Subject
Mechanical engineering
Classification
0548: Mechanical engineering
Identifier / keyword
Applied sciences; Adhesively bonded; Lap shear joints
Title
The analysis and design of adhesively bonded composite structures
Author
Radice, Joshua J.
Number of pages
279
Publication year
2005
Degree date
2005
School code
0060
Source
DAI-B 66/07, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780542228872, 0542228874
Advisor
Vinson, Jack R.
University/institution
University of Delaware
University location
United States -- Delaware
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3181889
ProQuest document ID
304993275
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304993275
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