%0 Journal Article
%T MODELLING THE BRITTLE-DUCTILE TRANSITION<br>脆—韧转变的模型化
%A P B Hirsch FRS
%A <br>P.B.HirschFRS
%J 金属学报
%D 1997
%I 
%X Many crystalline solids fail by cleavage at low temperatures. and by plastic processes at high temperatures. In the transition region cleavage failure occurs at stresses increasing with increasing temperature. reflecting a decrease in yield stress. and a consequent increase of plasticity around the crack tip. Crack tip plasticity blunts the crack and shields it through compressive stresses in the plastic zone. This paper gives a brief review of a model of the brittle-ductile transition in which the shielding is calculated from a plastic zone formed by the generation (from a source). motion and interaction of dislocations moving on a slip plane containing the crack tip. and obeying a velocity/stress/temperature law. The application of the model to experiments is discussed.
%K brittle-ductile transition
%K modelling
%K crack tip
%K dislocation<br>脆－韧转变
%K 模型化
%K 裂纹
%K 位错
%K 晶体
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=17FA1B77429011616F1DC1F3D84C413D&yid=5370399DC954B911&vid=27746BCEEE58E9DC&iid=38B194292C032A66&sid=4966445AEEBA9556&eid=E1D946F217E3B046&journal_id=0412-1961&journal_name=金属学报&referenced_num=0&reference_num=1