Adhesion and Adhesives Technology. An Introduction by Alphonsus V. Pocius PDF

Introduction

By Alphonsus V. Pocius

ISBN-10: 3446427481

ISBN-13: 9783446427488

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13) w a w a C,min Define a materials parameter, C, as being the minimum change in the strain energy density with crack length necessary to cause the propagation of a crack. 14) This expression says that for a body of width w, the change in energy with a change in crack length has to be greater than or equal to the quantity C, called the critical strain energy release rate. Note that the critical strain energy release rate has units of energy per unit area and is the rate of release of strain energy per unit area of crack growth.

7 shows a dashpot that is a piston inside a liquid-containing cylinder. If we pull on the piston shaft slowly and steadily, the piston moves with little applied force because liquids are infinitely deformable. If we pull rapidly on the piston shaft, however, the liquid cannot move fast enough past the edges of the piston and thus resists the motion of the piston. We have all seen dashpots in action. Part of the shock absorber in an automobile is a dashpot, as is part of the mechanism used to close doors automatically in buildings.

Somewhere in the body, there exists a crack of length a. 1). The crack has a length, a. A force is applied to the body and displacement results. 6 (the thin solid line). A strain energy density is calculated for this situation. 6. At some point during the deformation of the body, the crack in the body grows. As this happens, the stiffness of the body changes and a new stress-strain curve results. The slope of the stress-strain curve changes because the stiffness of the body is different because it contains a larger crack.

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Adhesion and Adhesives Technology. An Introduction by Alphonsus V. Pocius


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