Fracture II. A theoretical estimation of fracture surface energy

✍ Scribed by M. R. Piggott

• Publisher: Springer Netherlands
• Year: 1975
• Tongue: English
• Weight: 619 KB
• Volume: 11
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00116364

✦ Synopsis

A B S T R A C T

In the discussion of the form taken by the expression for the energy for a crack of finite width, an energy term analogous to the plastic work of fracture was introduced. This term is shown to account for the normally observed relation between failure stress and crack length for brittle materials, and methods of estimating it are discussed. It is shown that the fracture surface energy of homogeneous materials such as glass can be derived approximately from an atomistic model. Metals, however, require consideration of larger scale non-uniformities such as those observed in the electron microscope, and it is shown that a modified expression derived for the toughness of fibre reinforced composites gives toughness values of the correct order of magnitude for metals.