کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
775254 1463132 2012 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study of creep relaxation under combined mechanical and residual stresses
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Study of creep relaxation under combined mechanical and residual stresses
چکیده انگلیسی

In this work the elastic and elastic–plastic creep behaviour of cracked structures in the presence of residual stress has been studied numerically. The residual stress is introduced by prior mechanical loading and mechanical stress levels are varied to evaluate the transient crack tip parameter, C(t), in single edge notch bend, SEN (B), and tension, SEN (T), specimens, using the finite-element (FE) method. The near tip stress distributions are examined and the influence of residual stress on the evolution of the stress fields, quantified by C(t), is examined. The values of C(t) obtained from the FE analysis are compared to existing analytical solutions. It has been found that the transient C(t) value provides an accurate characterisation of the crack tip fields under combined primary and secondary stress. It has also been found that the level of conservatism of current C(t) estimation schemes, which account for primary and secondary stress, depends on material properties and the level of primary and secondary stress.


► We study the creep behaviour of cracked structures in the presence of residual stress.
► Creep crack tip parameter, C(t), is evaluated using the finite element analysis.
► A number of available analytical equations for the estimation of C(t) are used.
► The analytical results are compared with those from the finite element analysis.
► Level of conservatism of the available analytical equations is examined.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Fracture Mechanics - Volume 93, October 2012, Pages 132–152
نویسندگان
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