مطالعه تأثیر فرآیند اتوفرتاژ در استوانه جدار ضخیم با کامپوزیت زمینه فلزی به روش تحلیل اجزای محدود تنش چرخه‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه سمنان، سمنان، ایران

2 دانشکده مهندسی مکانیک، دانشگاه آزاد اسلامی واحد علوم و تحقیقات، تهران، ایران

چکیده

در این مطالعه، یک پژوهش با شبیه‌سازی عددی استوانه جدار ضخیم با بارگذاری چرخه‌ای حرارتی- مکانیکی انجام شده است. شرایط مرزی اعمال شده مشابه لوله سلاح در هنگام شلیک مداوم است. چهار شرط تنشی در دمای 25-950 درجه سانتیگراد و فشار 100-350 مگاپاسکال در طول چرخه بارگذاری مورد بررسی قرار گرفته است. شرایط عبارتند از اول بارگذاری حرارتی- مکانیکی بدون اتوفرتاژ و بدون ترک، دوم حرارتی- مکانیکی با اتوفرتاژ بدون ترک، سوم بارگذاری حرارتی- مکانیکی در لوله دارای ترک بدون اتوفرتاژ با افزایش طول ترک و چهارم بارگذاری حرارتی- مکانیکی در لوله اتوفرتاژ شده دارای ترک با افزایش طول ترک. مقایسه نتایج حاصل از مدل‌های شبیه‌سازی لوله اتوفرتاژ شده و بدون اتوفرتاژ دارای اطلاعاتی در مورد گسترش کرنش‌ها و تنش‌ها در لوله است. مواد مورد مطالعه در لوله، فولاد ST50 و کامپوزیت زمینه فلزی SiC/Ti-24Al-11Nb در سه نسبت قطر 25، 50 و 75 درصد به یکدیگر است. گرایش کلی بارگذاری در لوله اتوفرتاژ شده منجر به اثر نرم شدن سطح لوله می‌شود. این پدیده به عنوان کاهش سختی سطح داخلی لوله مشاهده می‌شود. همچنین حداکثر تنش ناشی از چرخه ترمومکانیکی تا عمق 9 میلی‌متر برای لوله با طراحی ترکیبی وجود دارد و پس از آن تغییرات حداقلی است. این عمق فعال برای شروع ترک است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Study of Autofrettage Process Effect in Thick-walled Cylinder with Metal Matrix Composite by the method of Finite Element Cyclic Stress Analysis

نویسندگان [English]

  • Hassan Sayar 1
  • Ramin Molahamzezadeh 2
  • Mohammad Hossein Korani 2
  • Mohammad Azadi 1
1 Semnan University
2 Islamic Azad University
چکیده [English]

The goal of this study is to analyze the interplay of mechanical and thermal properties and the applied thermomechanical cyclic load combined with the fatigue crack numerical simulation of a thick cylinder. The applied boundary conditions are similar to the working gun barrel during continuous firing. Four stress conditions in 25-950°C and 100-400 MPa pressure has been investigated. Conditions include first, without autofrettage and cracking; second, with autofrettage and without cracking; third, without autofrettage and with cracking; and fourth with autofrettage and with cracking has been investigated. A comparison of the results obtained from simulated models of the autofrettaged and non-autofrettaged barrels has information about the evolution of strains and stresses in the barrel at different points under thermo-mechanical loading cycles in both cases. The materials in the barrel were ST50 steel and SiC/Ti-24Al-11Nb metal matrix composite in three different diameter ratios. The results showed that autofrettage softened the inner surface of the barrel. This phenomenon was seen as a decrease in the hardness of the inner surface of the barrel. The maximum stress of thermomechanical cyclic loading there was until 9 mm of depth. This depth is the active length of crack propagation.

کلیدواژه‌ها [English]

  • Thick-walled cylinder
  • Autofrettage
  • Metal-matrix composite
  • Numerical simulation
  • Crack

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نشریه مهندسی مکانیک امیرکبیر
دوره 54، شماره 8
آبان 1401
صفحه 1867-1894

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