The three fracture modes Fracture mechanics is the field of concerned with the study of the propagation of cracks in materials. It uses methods of analytical to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to. In modern, fracture mechanics is an important tool used to improve the performance of mechanical components. It applies the of and behavior of materials, in particular the theories of and, to the microscopic found in real materials in order to predict the macroscopic mechanical behavior of those bodies. Is widely used with fracture mechanics to understand the causes of failures and also verify the theoretical failure predictions with real life failures. The prediction of crack growth is at the heart of the mechanical design discipline.

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There are three ways of applying a force to enable a crack to propagate: • Mode I fracture – Opening mode (a normal to the plane of the crack), • Mode II fracture – Sliding mode (a acting parallel to the plane of the crack and perpendicular to the crack front), and • Mode III fracture – Tearing mode (a shear stress acting parallel to the plane of the crack and parallel to the crack front). Contents • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Motivation [ ] The processes of material manufacture, processing, machining, and forming may introduce flaws in a finished mechanical component. Arising from the manufacturing process, interior and surface flaws are found in all metal structures. Not all such flaws are unstable under service conditions. Fracture mechanics is the analysis of flaws to discover those that are safe (that is, do not grow) and those that are liable to propagate as cracks and so cause of the flawed structure. Despite these inherent flaws, it is possible to achieve through analysis the safe operation of a structure.

Fracture mechanics as a subject for critical study has barely been around for a century and thus is relatively new. Fracture mechanics should attempt to provide quantitative answers to the following questions: • What is the strength of the component as a function of crack size? • What crack size can be tolerated under service loading, i.e. What is the maximum permissible crack size? • How long does it take for a crack to grow from a certain initial size, for example the minimum detectable crack size, to the maximum permissible crack size? • What is the service life of a structure when a certain pre-existing flaw size (e. Marty Mcfly Blue Strings. g. A manufacturing defect) is assumed to exist?