Abstract
Atomic cohesion is the bond between atoms, holding them together to form an aggregate that does not disintegrate under the normal conditions characteristic of that specific material. Hence, a short look at the essentials of cohesion aids in understanding fracture, which occurs when a force of a certain magnitude is applied against the atomic bonding of the atoms to cause the disintegration of a material. Those forces that hold the groups of atoms or molecules of a substance together are called ‘bonds’. The formation of bonds between atoms is mainly due to their tendency to attain minimum potential energy, thus reaching a stable state. In solid material, it is usually assumed that two types of forces act between the atoms: (a) an attractive force, which keeps the atoms together, forcing them to form solids and (b) a repulsive force, which comes into play when a solid is compressed. Figure 7.1a shows the concept of cohesion, based on the relation below, graphically:
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Pelleg, J. (2013). Fracture. In: Mechanical Properties of Materials. Solid Mechanics and Its Applications, vol 190. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4342-7_7
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