برآورد ∗C شامل تأثیر تنش آستانه
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برآورد ∗C شامل تأثیر تنش آستانه

عنوان فارسی مقاله: برآورد ∗C شامل تأثیر تنش آستانه
عنوان انگلیسی مقاله: Estimation of C∗ including the effect of threshold stress
مجله/کنفرانس: مهندسی مکانیک شکست - Engineering Fracture Mechanics
رشته های تحصیلی مرتبط: مکانیک
گرایش های تحصیلی مرتبط: طراحی کاربردی، طراحی جامدات
کلمات کلیدی فارسی: تنش آستانه، تخمین روش ∗C، روش GE / EPRI، روش مرجع تنش
کلمات کلیدی انگلیسی: Threshold stress، Estimation method of C∗، GE/EPRI method، Reference stress method
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
نمایه: Scopus - Master Journals List - JCR
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.engfracmech.2017.12.032
دانشگاه: School of Chemical Engineering, Fuzhou University, Fuzhou, Fujian 350-116, China
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2018
ایمپکت فاکتور: 3/270 در سال 2018
شاخص H_index: 106 در سال 2019
شاخص SJR: 1/331 در سال 2018
شناسه ISSN: 0013-7944
شاخص Quartile (چارک): Q1 در سال 2018
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 9
وضعیت ترجمه: ترجمه نشده است
قیمت مقاله انگلیسی: رایگان
آیا این مقاله بیس است: خیر
آیا این مقاله مدل مفهومی دارد: ندارد
آیا این مقاله پرسشنامه دارد: ندارد
آیا این مقاله متغیر دارد: ندارد
کد محصول: E13239
رفرنس: دارای رفرنس در داخل متن و انتهای مقاله
فهرست انگلیسی مطالب

Abstract


1- Introduction


2- Estimation method of C∗


3- Finite element analysis


4- Accuracy of the modified methods and discussion


5- Conclusions


References

نمونه متن انگلیسی مقاله

Abstract


In some alloys such as 9%Cr heat resistant steels and magnesium alloys, the creep constitutive equation of the power-law requires a term of threshold stress due to the presence of second phase particles. It is necessary to establish an estimation method of C∗ for such alloys to predict the life of their components. In this paper, the General Electric/Electric Power Research Institute (GE/EPRI) method and the reference stress method were modified to estimate C∗ for power-law creep materials with threshold stress. The finite element method was used to verify the accuracy of the modified methods. The accuracy of the calculation equation of C∗ in the American Society for Testing Materials (ASTM) E 1457 was also assessed. The results indicated that the modified GE/EPRI method was sufficiently exact as an engineering method. h1 was slightly affected by the applied load and significantly affected by the threshold stress. The accuracy of the modified reference stress method increased with increased applied load and was within ±40%. The accuracy of the calculation equation of C∗ in ASTM E 1457 was not affected by the threshold stress and the equation could be directly used for power-law creep materials with threshold stress.


Introduction


C∗ is one of the parameters used for characterizing the creep crack growth and the stress field at the crack tip region. Accurate estimation of C⁄ plays an important role in the analysis of fracture mechanics and lifetime prediction for structures at elevated temperatures. Many studies have been conducted to research estimation methods of C⁄ . The General Electric/ Electric Power Research Institute (GE/EPRI) method is widely used to estimate C⁄ for homogeneous materials [1,2]. The reference stress method is another widely used method for estimating C⁄ [3,4]. Based on the reference stress method, Xuan [5] proposed a method to estimate C⁄ for mismatched weld creep cracks and Kim [6,7] proposed an enhanced reference stress method to estimate C⁄ . Other methods have also been proposed to estimate C⁄ for mismatched weld creep cracks [8,9] in addition to cracks in thin T-sections [10] and annular discs [11]. Further, the calculation equation of C⁄ in the American Society for Testing Materials (ASTM) E 1457 was modified for mismatched weld creep cracks by Xuan [12]. However, there has been no research on the estimation of C⁄ for materials with power-law creep constitutive equations that include a term of threshold stress. Since threshold stress exists in some alloys due to the presence of second-phase or nanometer-sized particles, such as dispersion hardened alloys [13–16] and nanocomposites [17,18], it is necessary to establish estimation methods of C⁄ with the effect of threshold stress included.

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