The relationship of the critical stress versus impulse theory of spall fracture to the stress-gradient theory

✍ Scribed by J. C. Peck; H. M. Berkowitz; L. J. Cohen

• Publisher: Springer Netherlands
• Year: 1969
• Tongue: English
• Weight: 360 KB
• Volume: 5
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00190959

✦ Synopsis

A spall fracture criterion based on critical stress versus stress gra&ent is briefly revaewed and discussed, An extension of a technique us~ by Tuler and Butcher is employed to show that the results of the stress-gradient theory can be interpreted in terms of criteria involving critical stress versus either impulse or pulse duration. The latter criteria are represented by smooth curves that depend on two parameters--the static strength limat for long-duration loads and an impulse limit for short-duration loads. Expressions for these parameters are presented in terms of the two parameters of the stress-gradient theory. Examples are ~resented for submicrosecond loads on 1100 aluminum and copper that show the stress-impulse interpretation differs little from the pure-impulse interpretation of Tuler and Butcher.