دانلود رایگان مقاله انگلیسی عملکرد خستگی و ارزیابی اتصالات جوش در پل های خرپای فولادی - الزویر 2018

عنوان فارسی
عملکرد خستگی و ارزیابی اتصالات جوش در پل های خرپای فولادی
عنوان انگلیسی
Fatigue performance and evaluation of welded joints in steel truss bridges
صفحات مقاله فارسی
0
صفحات مقاله انگلیسی
7
سال انتشار
2018
نشریه
الزویر - Elsevier
فرمت مقاله انگلیسی
PDF
نوع مقاله
ISI
نوع نگارش
مقالات پژوهشی (تحقیقاتی)
رفرنس
دارد
پایگاه
اسکوپوس
کد محصول
E10728
رشته های مرتبط با این مقاله
مهندسی عمران
گرایش های مرتبط با این مقاله
سازه، مدیریت ساخت
مجله
مجله تحقیقات فولاد ساختمانی - Journal of Constructional Steel Research
دانشگاه
Centre for Infrastructure Engineering - School of Computing Engineering and Mathematics - Western Sydney University - Australia
کلمات کلیدی
پل خرپای فولادی، مقاومت خستگی، درمان ضربه التراسونیک، مشخصات Corner-filleted، ارزیابی خستگی
doi یا شناسه دیجیتال
https://doi.org/10.1016/j.jcsr.2018.05.009
۰.۰ (بدون امتیاز)
امتیاز دهید
چکیده

abstract


While welded joints are extensively used in the connections of steel truss bridges, service life of the bridges is largely dependent on the fatigue resistance of the welded joints. Stress concentration and weld residual stress are two primary causes of fatigue damage in the welded joints. In this study, corner-fillet profile (CFP) and ultrasonic impact treatment (UIT) are used to improve the fatigue performance of the welded joints through relieving stress concentration and weld residual stresses, respectively. The fatigue resistance of welded joints is evaluated through experimentation. The results indicate that the use of CFP and/or UIT can alter the initiation location of fatigue crack. The fatigue resistance of welded joints was increased by 24% and 36% by using the CFP and UIT, respectively. The fatigue performance of welded joints was evaluated using three different methods, including the nominal stress method, effective notch stress method, and peak stress method. The peak stress method with a single fatigue resistance curve demonstrated the highest applicability and accuracy.

نتیجه گیری

Conclusions


The main conclusions are summarized as follows:


(1) The use of CFP and/or UIT changed the fatigue failure mode of the welded joints. Fatigue cracks initiate at the flange plate edges for the welded joints without CFP, and on the flange plate surface for the welded joints with CFP. Fatigue cracks initiate at the weld root or weld of the welded joints with UIT, and at the weld toe of the welded joints without UIT.


(2) The use of CFP and UIT increased the fatigue resistance of welded joints by 24% and 36%, respectively. Combined use of CFP and UIT increased the fatigue resistance by 60%. Compared with CFP, the use of UIT was more effective in enhancing the fatigue resistance.


(3) The fatigue resistance of the welded joints at 2 million cycles was estimated 205 MPa and 158 MPa, using the effective notch stress method and peak stress method, respectively. The scatter index of the peak stress method was 2.05, which is much lower than 2.83 of the effective notch stress method, indicating that the peak stress method had a wider applicability and higher accuracy for fatigue evaluation of welded joints.


بدون دیدگاه