کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
277509 1430231 2014 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructural modeling of crack nucleation and propagation in high strength martensitic steels
ترجمه فارسی عنوان
مدلسازی میکروساختار نوکلئوتیدی و تکثیر ترک در فولادهای مارنزیتی با مقاومت بالا
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی

A dislocation-density based multiple-slip crystalline plasticity formulation, a dislocation-density grain boundary (GB) interaction scheme, and an overlapping fracture method were used to investigate crack nucleation and propagation in martensitic steel with retained austenite for both quasi-static and dynamic loading conditions. The formulation accounts for variant morphologies, orientation relationships, and retained austenite that are uniquely inherent to lath martensitic microstructures. The interrelated effects of dislocation-density evolution ahead of crack front and the variant distribution of martensitic blocks on crack nucleation and propagation are investigated. It is shown that dislocation-density generation ahead of crack front can induce dislocation-density accumulations and plastic deformation that can blunt crack propagation. These predictions indicate that variant distribution of martensitic blocks can be optimized to mitigate and potentially inhibit material failure.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Solids and Structures - Volume 51, Issues 25–26, December 2014, Pages 4345–4356
نویسندگان
, ,