Instability, fracture acceleration and wave amplification

✍ Scribed by Linkov, A.M.

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 190 KB
• Volume: 37
• Category: Article
• ISSN: 0148-9062
• DOI: 10.1016/s1365-1609(99)00089-1

✦ Synopsis

Cook's concept, which connects instability in a form of a jump (dynamic event instability, with softening), is discussed. A review of recent extensions of the concept is presented. It is outlined that for static problems, not explicitly involving time, stable bifurcation may occur instead of a dynamic event. For problems involving a time factor, Cook's concept is extended both to slow and rapid processes. It is revealed that the in¯uence of softening on slow processes, such as creep, appears as either instability or stable fracture acceleration. The in¯uence of softening on rapid processes (involving inertia) can manifest itself as wave ampli®cation. The latter transforms into instability under the conditions discussed. A brief conclusion summarizes the exposition.