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- Publisher
- Springer Journals
- Copyright
- 2000 Chinese Society of Theoretical and Applied Mechanics
- ISSN
- 0567-7718
- eISSN
- 1614-3116
- DOI
- 10.1007/BF02487686
- Publisher site
- See Article on Publisher Site
Abstract
Abstract In this paper, an improved plate impact experimental technique is presented for studying dynamic fracture mechanism of materials, under the conditions that the impacting loading is provided by a single pulse and the loading time is in the sub-microsecond range. The impacting tests are carried out on the pressure-shear gas gun. The loading rate achieved is dK/dt∼108 MPa m1/2s−1. With the elimination of influence of the specimen boundary, the plane strain state of a semi-infinite crack in an infinite elastic plate is used to simulate the deformation fields of crack tip. The single pulses are obtained by using the “momentum trap” technique. Therefore, the one-time actions of the single pulse are achieved by eradicating the stress waves reflected from the specimen boundary or diffracted from the crack surfaces. In the current study, some important phenomena have been observed. The special loading of the single pulse can bring about material damage around crack tip, and affect the material behavior, such as kinking and branching of the crack propagation. Failure mode transitions from mode I to mode II crack are observed under asymmetrical impact conditions. The mechanisms of the dynamic crack propagation are consistent with the damage failure model.
Journal
"Acta Mechanica Sinica" – Springer Journals
Published: Nov 1, 2000