روش نوین محاسبه کرنش شکست قطعات برشی و ناچ‌دار در شرایط دمایی و سه‌محوره‌ی تنش مختلف

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مهندسی و ساخت شرکت خدمات بازرگانی معادن و فلزات غیرآهنی، تهران، ایران

2 دانشکده فنی، دانشگاه تهران، تهران، ایران

چکیده

تعیین مشخصات پایدار رفتار ماده تحت تأثیرات تنش و دما به منظور طراحی مطلوب و همچنین بهینه‌سازی پارامترهای فرآیند ساخت در صنعت فرم‌دهی فلزات به طرز قابل توجهی مهم و حیاتی است. هدف این پژوهش ارائه یک روش نوین اندازه‌گیری کرنش شکست قطعات برشی و ناچ‌دار در سه‌محوره‌های مختلف تنش با استفاده از دستگاه اندازه‌گیری وی ام ام می‌باشد. همچنین تاثیرات افزایش دما بر کرنش شکست نیز بررسی شده است. ماده مورد بررسی آلومینیوم 5083-اچ 321 می‌باشد. برای این منظور بیست و چهار نمونه مختلف تخت از جمله نمونه‌های برشی و ناچ‌دار برای چهار نوع سه‌محوره‌ی 2/0 و 33/0 و 38/0 و 55/0 جهت تست در سه محدوده دمایی (25، 200 و 400 درجه سانتیگراد) آماده‌سازی شدند و تحت شرایط بارگذاری استاتیکی مورد آزمایش قرار گرفته‌اند. کرنش شکست نمونه ها اندازه‌گیری و نتایج مرتبط بدست آمدند. نتایج بدست‌آمده با نتایج تجربی دیگران و همچنین نتایج شبیه‌سازی شده با استفاده از مدل رایس و تریسی مقایسه شدند. همچنین با انجام آزمایش‌های جدیدی که در این مقاله انجام شده است، نقطه قطع‌شدن منحنی در سه‌محوره 2/0 بدست آمده است. با بررسی نتایج مشاهده می‌شود در دمای پایین (℃25)، با افزایش سه‌محوره تنش، کرنش شکست روندی کاهشی دارد، در حالی که در دمای ℃200 این روند تقریبا ثابت و یکنواخت است ولی در دمای ℃400 این روند افزایشی است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

A New Method for Calculating the Fracture Strain of Shear and Notched Specimens at Various Temperature and Stress Triaxialities

نویسندگان [English]

  • Amirreza Ostadi 1
  • Seyed Mahdi Ganjiani 2
1 Engineering and Construction of Non Ferrous Mines and Metals Commercial Services Company, Tehran, Iran
2 Department of Mechanical Engineering, University of Tehran, Tehran, Iran
چکیده [English]

Determining stable characteristics of material behavior under the effects of stress and temperature on the material is significantly important for optimal design. The aim of this study is to present a new method for measuring the fracture strain of shear and tensile parts in different stress triaxialities with the effect of temperature, using a Video Measuring Machine measuring device. Aluminum 5083-H321 is used in this study. For this purpose, twenty-four different samples including shear and tensile samples for four types of triaxialities 0.2, 0.33, 0.38, and 0.55 were prepared for testing in the temperature ranges (25, 200, and 400°C). The samples are tested under monotonic (static) loading conditions. The fracture strains are measured. The stress triaxialities are calculated in the finite element simulation. The obtained results are compared with the other experimental results and also with the numerical results of the Rice and Tracy model. A good agreement is found between these results which validates the new proposed technic for measuring the shear fracture stain. Based on the results, the curve of fracture strain versus stress triaxiality has a decreasing trend at 25°C, while this curve is almost constant at 200°C and has an increasing trend at 400°C.

کلیدواژه‌ها [English]

  • Stress triaxiality
  • Temperature
  • Fracture strain
  • Finite element simulation
  • Video measuring method

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نشریه مهندسی مکانیک امیرکبیر
دوره 54، شماره 8
آبان 1401
صفحه 1917-1932

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