کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7195994 | 1468305 | 2018 | 42 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Two-parameter approach of creep crack initiation times considering the constraint effect induced by specimen geometry
ترجمه فارسی عنوان
رویکرد دو پارامتر زمان شروع باز شدن خم شدن با توجه به اثر محدودیت ناشی از هندسه نمونه
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موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
چکیده انگلیسی
In this paper, a two-parameter approach and finite element method were conducted to investigate the constraint effect of six different types of cracked specimen geometries on the creep crack initiation (CCI) time. The theoretical enhanced model of the Câ-Qâ approach, which considers the load-independent constraint parameter Qâ, was proposed to predict the CCI time around a sharp crack tip. The order of Qâ values and the creep damage accumulation rate for the different specimen geometries was C(T)â¯>â¯CS(T), SEN(B)â¯>â¯SEN(T)â¯>â¯DEN(T)â¯>â¯M(T). Whereas the CCI times were ordered conversely. The influence of the constraint on hydrostatic stresses, triaxiality and multiaxial strain factor was discussed. The suitability of the two-parameter approach was verified due to the comparison of CCI times between theoretical and simulated results, which demonstrated that the Câ-Qâ two-parameter prediction approach under stress intensity factor-Riedel-Rice (K-RR) control (initially by K, then by transient creep stress or Riedel-Rice conditions) and Hutchinson-Rice-Rosengren-Riedel-Rice (HRR-RR) control (initially by plastic HRR control, then by RR conditions) could conservatively and effectively predict the CCI times. The K-RR solutions were more accurate when initial stress intensity factor Kâ¯<â¯6â¯MPaâ¯m1/2, while the HRR-RR solutions were more appropriate when Kâ¯>â¯6â¯MPaâ¯m1/2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Theoretical and Applied Fracture Mechanics - Volume 96, August 2018, Pages 31-44
Journal: Theoretical and Applied Fracture Mechanics - Volume 96, August 2018, Pages 31-44
نویسندگان
Dongquan Wu, Hongyang Jing, Lianyong Xu, Lei Zhao, Yongdian Han,