Essential work of fracture (we) versus energy dissipation rate (Jc) in plane stress ductile fracture

✍ Scribed by M. P. Wnuk; D. T. Read

• Publisher: Springer Netherlands
• Year: 1986
• Tongue: English
• Weight: 614 KB
• Volume: 31
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00018925

✦ Synopsis

Two measures of fracture toughness have been investigated. The first is the Cotterell's essential work of fracture (we) which reflects the energy absorbed in the process of localized necking and decohesion occurring within the crack tip region. The second is the familiar critical energy dissipation rate associated with the onset of crack extension and commonly designated by Jc-Total of 48 fracture tests have been performed on thin aluminum double-edge-notched panels and thin compact tension specimens with varying crack size-to-ligament ratios. In a simple experimental procedure it has been established that both measures are equivalent, at least under the plane stress conditions, and that they both represent the fraction of energy which is transmitted through the plastic deformation field into the crack tip region. The ratio "essential work of fracture/total work of fracture" has been suggested as a quantitative measure of the energy transmission process. Certain predictions are made concerning variations of the energy transmission factor (ETF) during the stable phase of ductile fracture propagation.