پیش‌بینی رشد ترک در فولاد سازه‌ای St52 با استفاده از آزمون نشرآوایی وکاربرد آن برای سازه های فولادی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 علم و صنعت*مهندسی مکانیک

2 دانشجوی ذکتری/دانشگاه علم و صنعت

3 دانشجوی کارشناسی ارشد مهندسی مکانیک- دانشگاه علم و صنعت ایران

چکیده

فناوری نشر آوایی، یکی از روش‌های نوین در زمینه آزمون‌های غیر مخرب می‌باشد که قابلیت بررسی رشد ترک در قطعات فلزی را داشته و برای به کارگیری بر روی سازه‌هایی نظیر پل جهت بررسی و ضعیت اعضای آن مناسب می‌باشد و اطلاعات این آزمون می‌تواند برای برنامه‌ریزی زمان‌بندی نگهداری سازه پل به کار رود. در راستای پژوهش‌های تجربی، نمونه‌هایی از جنس فولاد سازهای اِس.تی 52 به صورت نمونه‌های کششی فشرده تحت بارگذاری خستگی محوری به منظور بررسی رشد ترک به همراه فیکسچر مورد نیاز نیز تهیه شد. سپس با کمک نتایج حاصل از آزمون‌های تجربی ارتباط بین پارامترهای نشر آوایی از جمله نرخ انرژی و نرخ شمارش، رشد ترک و عمر خستگی مورد بررسی قرار گرفته است. سپس با استفاده از نتایج استخراج شده از آزمون نشر آوایی و خستگی و با استفاده از تحلیل رگرسیون حداقل مربعات، مقادیر ثابت آنها محاسبه شده و نهایتا طول ترک اندازه‌گیری شده و نتایج آن ارائه گردیده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Determination of Crack Growth in St52 Structural Steel via Acoustic Emission Technique and Its Application in Steel Structures

نویسندگان [English]

  • mohammad riahi 1
  • seyed mostafa matloobi 2
  • seyed milad hoseinnejad 3
2 PhD student/IUST
3 mechanical engineering of master of science student, iran university of science and technology
چکیده [English]

Acoustic emission is one of the most important techniques in none-destructive test, that is able to evaluate crack growth in steel element of structure and is efficient in order to condition monitoring for deployment on in-service bridge component and these data can be used for schedule planning for maintenance of bridge structure. In the line of experiments and empirical research, samples of structural steel (St52) were used as a compact tension specimen in axial tensile fatigue test in order to study the crack growth. In this study, application of acoustic emission technique for health monitoring and determination of crack length in components of steel structure which are under axial fatigue load are investigated by using experimental test result, for this purpose correlation between acoustic emission parameters such an energy rate, count rate, and crack length and fatigue life has been studied. Finally, by using the extracted data from acoustic emission and fatigue test result, and least mean square regression analysis, the value of the constant for the relation between crack length and acoustic emission parameters have been determined.

کلیدواژه‌ها [English]

  • steel bridge
  • fatigue life
  • acoustic emission
  • Structural health monitoring
  • crack growth
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