Seminar khoa học của Giáo sư Lev Truskinovsky: Quantized plastic deformation

Vào 15h00, ngày 19/09/2025 Viện IAST tổ chức buổi trao đổi học thuật tại Phòng họp Lầu 5 Thư viện - Trường Đại học Tôn Đức Thắng với nội dung chi tiết như sau: 

GS.  Lev Truskinovsky báo cáo về chủ đề "Quantized plastic deformation"
Abstract:  

In this talk we present the basics of the novel mesoscopic tensorial model  of crystal plasticity, which   operates with the macroscopic notions of stress and strain while capturing, in a geometrically exact way, the slip-generating mappings of crystal lattices onto themselves. The  model introduces a  matrix-valued spin variable, representing the quantized plastic distortion, whose rate-independent evolution can be described by a discrete  automaton.  We provide compelling evidence that the  new theory is fully adequate to deal with the intermittency of plastic response under quasi-static loading. In particular, our numerical experiments show that the statistics of dislocational avalanches, associated with plastic yield in 2D square crystals, exhibits a power-law tail with a critical exponent matching the value predicted by general theoretical considerations and also independently observed in discrete-dislocation-dynamics  simulations.