مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

تاثیر دما و ممان های خمشی در میزان انباشتگی کرنش لوله های سه راهی از جنس فولاد کربنی ساده

نوع مقاله : پژوهشی اصیل

نویسندگان
سید جاوید زکوی
اسماعیل بخشی پور
دانشگاه محقق اردبیلی
10.52547/mme.22.7.461
چکیده
در این مقاله، با استفاده از مدل سختی سینماتیکی شابوش به همراه قانون سخت­شوندگی ایزوتروپیک به بررسی تاثیر دما و ممان­های خمشی در میزان رفتار انباشتگی کرنشی لوله سه­راهی از جنس فولاد کربنی ساده پرداخته می­شود. لوله­های سه­راهی تحت فشار و دمای داخلی ثابت همراه با ممان دینامیکی سیکلی داخل صفحه متاثر از پنج دمای 20، 50، 100، 150 و 200 درجه سانتی­گراد می باشند. نتایج عددی به دست آمده بر روی نمونه­های مورد آزمون نشانگر این است که حداکثر مقدار کرنش پیش‌رونده در نزدیکی محل اتصال سه‌راهی در جهت محیطی اتفاق می‌افتد. کرنش­های پیش­رونده به وجود آمده، اکثراً ناشی از ممان­های دینامیکی و دماهای بالا می­باشد. نتایج به دست آمده نشان می­دهد که در هر سه نمونه موجود، میزان کرنش­های پیش­رونده با افزایش اندازه ممان­دینامیکی و دما، افزایش می­یابد. با افزایش نسبت قطر به ضخامت در لوله­های سه­راهی، شروع کرنش­های پیش رونده محیطی در نسبت های ممان کم اتفاق می افتد. در کل می­توان نتیجه گرفت که نرخ کرنش­های پیش­رونده در ابتدا زیاد بوده و با افزایش سیکل­ های بارگذاری، این نرخ به علت غالب بودن پدیده سخت شوندگی کرنش کاهش پیدا می­کند. البته افزایش کرنش های پیش­رونده در دما­های بالا شامل کرنش خزشی به علت بالا رفتن دما و عمدتا کرنش پلاستیکی انباشته به علت پلاستیک سیکلی در اثر ممان های دینامیکی می­باشد.
کلیدواژه‌ها
لوله‌های سه‌راهی
انباشتگی کرنشی
خزش
مدل سختی ترکیبی
ممان دینامیکی

موضوعات

عنوان مقاله English

The Effect of Temperature and Bending Moments on the Strain Accumulation of Carbon Steel Piping Branch

نویسندگان English

Seyed Javid Zakavi
Esmaeil Bakhshipour
University of Mohaghegh Ardabili
چکیده English

In this paper, by using the Chaboche kinematic hardening model with the isotropic hardening law, the effect of temperature and bending moments is investigated on the strain accumulation behavior of carbon steel piping branch. Carbon steel branch junctions under internal pressure and temperature with dynamic bending moment are tested at five temperatures of 20, 50, 100, 150 and 200 ° C. The results obtained by numerical analysis show that the highest amount of ratcheting occurred near the branch junctions in the circumferential direction. The strain ratcheting occurred mainly because of dynamic moments and high temperatures. The results show that in all three samples, the amount of strain ratcheting increases with increasing of dynamic moment level and temperature. With increasing of the ratio of diameter to thickness in branch junctions, the onset of strain accumulation occurs at low moment levels. It can be concluded that initially, the rate of strain ratcheting is high and with the increase of loading cycles, this rate decreased due to the strain hardening phenomenon. The increase of strain ratcheting at high temperatures is due creep strain because of high temperature and mainly accumulated plastic strain under dynamic bending moments because of cyclic plasticity.

کلیدواژه‌ها English

Piping branch
Strain Accumulation
creep
Combined Hardening Model
Dynamic moment
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مهندسی مکانیک مدرس
دوره 22، شماره 7
تیر 1401
صفحه 461-471