مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی فشار ترکیدگی استوانه دولایه‌ی متداخل اتوفرتاژ شده با وجود ترک در سطح داخلی، بر اساس انتگرال J

نوع مقاله : پژوهشی اصیل

نویسندگان
محمد سجاد خدایاری
رحمن سیفی
دانشگاه بوعلی سینا
10.22034/mme.23.4.223
چکیده
مخازن استوانه­ای جدار ضخیم در صنایع نفت، شیمیایی، هسته­­ای و نظامی به منظور تحمل فشارهای داخلی کاربرد ویژه­ای دارند. وجود تنش پسماند فشاری در جداره­ی مخازن جدار ضخیم موجب افزایش فشار ترکیدگی و عمر خستگی آن می­گردد. فرآیندهای اتوفرتاژ و تداخل شعاعی در استوانه­ی چندلایه­ از روش­های مرسوم ایجاد تنش پسماند در جداره­ی مخازن می­باشند. به منظور دستیابی به استحکام و عمر خستگی بالاتر، از ترکیب این دو فرآیند نیز استفاده می­شود. انتگرال J معیار مناسبی جهت ارزیابی رشد ترک در میدان­های کرنش الاستیک و الاستوپلاستیک می­باشد. در این پژوهش با استفاده از روش اجزای محدود، توزیع انتگرال J در طول پیشانی ترک نیم بیضی در سطح داخلی استوانه­ی دولایه­ی متداخل که انتهای آن بسته بوده و لایه داخلی آن اتوفرتاژ گردیده، محاسبه و سپس فشار ترکیدگی بر مبنای معیار چقرمگی شکست ماده، JΙC تعیین شده است. همچنین تاثیر پارامترهای مقدار اتوفرتاژ، تداخل شعاعی، عمق، زاویه و شکل ترک بر توزیع انتگرال­ J و فشار ترکیدگی بررسی گردیده است. لایه­های داخلی و خارجی استوانه­ی دو لایه از جنس آلیاژ آلومینیوم 7075 گرید 6T در نظر گرفته شده است. رفتار سخت ­شوند­گی غیر خطی دوره­ای این آلیاژ با استفاده از مدل چابوچه، پیش بینی گردیده است. اعتبار پژوهش بررسی و دقت بالای نتایج، اثبات گردید
کلیدواژه‌ها
انتگرالJ
فشار ترکیدگی
روش اجزای محدود
ترک نیم بیضی
اتوفرتاژ
تداخل شعاعی

موضوعات

عنوان مقاله English

Investigating the bursting pressure of the autofrettaged and interferenced double-layered cylinder with a crack on the inner surface, based on the J-integral

نویسندگان English

Mohammad Sajjad Khodayari
Rahman Seifi
Bu-Ali Sina University
چکیده English

Thick-walled cylindrical vessels are specially used in oil, chemical, nuclear and military industries in order to withstand internal pressure. The presence of the compressive residual stress in the walls increases the bursting pressure and fatigue life. Autofrettage processes and radial interference in multilayer cylinders are among the conventional methods of creating residual stresses in the pressure vessels. In order to achieve higher strength and fatigue life, the combination of these processes is also considered. J integral method is a suitable criterion for evaluating the crack parameters in elastic and elastoplastic strain fields. In this research, distribution of the J integral along the semi-elliptical crack front on the inner surface of the interferenced two-layered cylinder with closed end has been studied. Inner layer was autofrettaged. Burst pressure was determined based on the fracture toughness criterion (JΙC). Also, the effects of the autofrettage percent, radial interference; depth, angle and aspect ratio of the crack on the J integral and burst pressure variations have been investigated. The inner and outer layers of the cylinder were made of 7075-T6 aluminum alloy. The periodic nonlinear hardening behavior of this alloy has been predicted using Chabooche model. The validity of the results and their accuracy were examined

کلیدواژه‌ها English

J integral
Burst pressure
Finite Elements Method
Semi-elliptical crack
Autofrettage
radial interference
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مهندسی مکانیک مدرس
دوره 23، شماره 4
فروردین 1402
صفحه 223-234