Abstract: In the paper the nonlinear dynamics of crystal dislocations have been strudod in the presence of an external periodicfield,the threshold value of chaos has been induced,the cascading bifureations have been discussed,the chaotie andnon-chaotic regions in a parameter planeδ/α～Ω have been given.

Key words: disiocations, bifurcations, chaos

摘要： 研究了外场作用下，位错的非线性动力学，导出了混沌的阈值，讨论了系统的级联分叉以及通向混沌的途径。并在参数平面δ／α～Ω上，给出了系统的的混沌区和非混沌区。

关键词: 位错, 分叉, 混沌