Fracture Initiation of Metals at High Loading Rates.

摘要

The purpose of this paper is to present a new experimental procedure which allows the determination of the fracture parameters of metals at very high loading rates. Using stress wave loading, a tensile stress pulse is applied on a notched pre-cracked bar providing the rupture. The duration of a test is about 20 mu s, and the range of loading rates lays between 10 exp 6 and 10 exp 8 MPa sqrt m s exp -1 . By recording load-time and crack opening displacement-time variations, Ksub(Ic) (for brittle materials) or Jsub(Ic) (for ductile materials) can be determined. In application of this technique, some results on a 35 NCD 16 steel are presented. (Atomindex citation 12:629728)