ارزیابی عمر خستگی اتصالات جوشی در پل فولادی
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ارزیابی عمر خستگی اتصالات جوشی در پل فولادی

عنوان فارسی مقاله: ارزیابی عمر خستگی اتصالات جوشی در پل فولادی با توجه به تنش پسماند
عنوان انگلیسی مقاله: Fatigue life evaluation of welded joints in steel bridge considering residual stress
مجله/کنفرانس: مجله تحقیقات فولاد ساختمانی - Journal of Constructional Steel Research
رشته های تحصیلی مرتبط: مهندسی عمران
گرایش های تحصیلی مرتبط: سازه، مدیریت ساخت
کلمات کلیدی فارسی: انتشار ترک خستگی، عمر خستگی، آزمایش های خستگی، خرپای فولادی، اتصالات جوشی، جوش دادن تنش پسماند
کلمات کلیدی انگلیسی: Fatigue crack propagation، Fatigue life، Fatigue tests، Steel truss، Welded joints، Weld residual stress
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
نمایه: Scopus - Master Journals List - JCR
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.jcsr.2018.11.003
دانشگاه: Department of Bridge Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2019
ایمپکت فاکتور: 3/171 در سال 2018
شاخص H_index: 81 در سال 2019
شاخص SJR: 1/719 در سال 2018
شناسه ISSN: 0143-974X
شاخص Quartile (چارک): Q1 در سال 2018
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 10
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: دارد
کد محصول: E11456
رفرنس: دارای رفرنس در داخل متن و انتهای مقاله
فهرست انگلیسی مطالب

Abstract


1- Introduction


2- Development of fatigue life model


3- Validation of fatigue life predication model


4- Case study


5- Conclusions


References

نمونه متن انگلیسی مقاله

Abstract


Welded joints are widely used to connect structural components in steel truss bridges. Weld residual stresses (WRS) and weld residual stresses relaxation (WRSR) have notable influences on fatigue crack propagation in welded joints, and therefore affect the fatigue life of welded joints. Failing to properly consider the effect of WRS and WRSR in fatigue evaluation may lead to inaccurate results. This study presents a fatigue life prediction model based on the elastic fracture mechanics, with consideration of the WRS and WRSR. The solution for stress intensity factor caused by cyclic loading and WRS is derived. The WRS-induced stress intensity factor is calculated using a weight function technique. Fatigue tests of eight welded joint specimens are implemented, and the fatigue failure analysis of specimens is conducted. The proposed fatigue life prediction model is validated against fatigue test results of welded joints. By considering both WRS and WRSR, the model provides a prediction of fatigue life with a maximum error of 14%. Finally, the validated model is employed to investigate the fatigue life of a real bridge. The fatigue life is underestimated by 17% by considering WRS but not considering WRSR; the fatigue life is overestimated by 49% by neglecting WRS and WRSR.


Introduction


Steel trusses are extensively used in highway and railway bridges. Fig. 1 shows the cross section of a typical steel truss girder [1–3].Welded joints and high-strength bolts have been used to connect different bridge components, such as the top and bottom chords, verticals, diagonals, bracings, etc. In Fig. 1, an I-shape steel beam is welded on a gusset plate that connects the bottom chords, vertical and diagonals. It has been found that the fatigue resistance of welded joint, especially the connection of gusset and flange plates (named as T-shape welded joint), is susceptible to traffic loads, weld residual stresses (WRS), weld defects, and stress concentration, etc. [3–5]. However, methods for predicting the fatigue life of the welded joint with consideration of WRS and WRSR are still under development. A lot of research efforts have been devoted to understanding the effect of WRS on fatigue failure. Sumi et al. [6] investigated the effect of WRS on fatigue life and failure paths through fatigue tests of butt welded plates. Galatolo and Lanciotti [7] reported that the WRS increased the growth rate of fatigue crack perpendicular to the weld line, reducing the fatigue life. Gerhard [8] established a formula to relate the WRS and crack growth threshold. Cui et al. [9] found that the WRS highly reduced the fatigue resistance of a steel bridge. Ultrasonic impact treatment was used to increase the threshold of stress intensity factor and enhance the fatigue resistance [10,11]. In addition to the experimental studies, finite element analysis has been carried out to study the effect of WRS on the fatigue life of welded joints under cyclic loading [12]. Although the effect of WRS on the fatigue resistance of welded joints has been studied, there are limited studies on the relaxation of WRS, namely WRSR, which is a phenomenon that the WRS is partially released at the welded joints under cyclic loading [13–17]. WRSR is a complicated procedure governed by the interaction of the amplitude and range of stresses, loading scenario, loading cycles, material properties, etc. [14]. A reasonable estimation of WRSR is the perquisite of predicting fatigue life of welded joints.

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