Download e-book for iPad: Adhesion science and engineering by Pocius A.V., Dillard D.A.

By Pocius A.V., Dillard D.A.

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Fracture specimens are made with intentional flaws that can be monitored during testing. By determining the energy required to propagate debonds, one can characterize the adhesive bond’s resistance to failure by fracture. Within this volume, the reader will find several approaches within this general framework. Chapter 2 introduces the concept of fracture mechanics, which is treated in more detail in Chapters 7 and 8. Chapter 3 provides an elegant overview of the energy approach to adhesion. Stresses and driving energies for contact problems relevant to adhesion are given in Chapter 11, and Chapter 15 uses fracture mechanics concepts to help interpret the failure modes occurring in bonded joints.

Timoshenko [67] showed that the resulting curvature for the geometry illustrated in Fig. 17 could be given by where Aa = a2 - c q , m = tl/t2, and it = E l / E 2 . This behavior can produce large stresses within the adherends as well as within the adhesive layer, and can cause significant problems with dimensional stability. Alternatively, the approach has proven to be quite useful in characterizing the coefficients of thermal expansion, residual stresses, and stress-free temperature of adhesives and coatings [68].

Further coverage of this approach will be given for several test methods described in Chapter 6. The second major approach to interpret failures and on which to base design is the fracture mechanics approach. Within this method, several different criteria can be used. The stress intensity approach scales linearly with the applied stress level, and provides a measure of the severity of the stresses in front of a crack or debond tip. The strain energy release rate approach scales as the square of the applied stress (for linear systems), and provides an intuitively meaningful measure of the energy required to debond a unit area of the propagating crack.

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Adhesion science and engineering by Pocius A.V., Dillard D.A.

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