بررسی توزیع مجدد تنش پسماند کششی مکانیکی بر اثر رشد ترک خستگی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی امیرکبیر

2 صنعتی امیرکبیر

چکیده

در این پژوهش، اثر بارگذاری خستگی بر توزیع مجدد تنش‌های پسماند مکانیکی در نمونه‌های کششی فشرده بررسی شده است. آزمون‌های تجربی رشد ترک خستگی طبق استاندارد E647 برای نمونه‌های بدون تنش پسماند اولیه و هم‌چنین نمونه‌های دارای تنش پسماند مکانیکی انجام گرفت. برای بررسی ناحیۀ پلاستیک نوک ترک و هم‌چنین به‌دست آوردن پارامترهای مکانیک شکست از تحلیل المان محدود به‌کمک نرم‌افزار المان محدود آباکوس استفاده شد. نتایج بررسی‌ها نشان داد که تنش پسماند اولیه پس از چند سیکل بارگذاری خستگی، توزیع مجدد می‌یابد که نحوۀ توزیع مجدد آن وابسته به سطح تنش پسماند اولیه و دامنۀ بارگذاری سیکلی می‌باشد. مساحت منطقۀ پلاستیک نوک ترک نیز با شروع بارگذاری خستگی کاهش می‌یابد و پس از تعداد محدودی سیکل، اندازۀ آن پایدار می‌گردد. در آزمون‌های تجربی، عمر خستگی نمونه‌های دارای تنش پسماند مکانیکی کمتر از عمر خستگی نمونه‌های بدون تنش پسماند به‌دست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of Fatigue Crack Growth on Mechanical Residual Stress Redistribution

نویسندگان [English]

  • Mohammad Noghabi 1
  • Iradj Sattarifar 2
  • Hossein Hosseini Todeshki 2
1 AmirKabir University of Technology
2 AmirKabir University of Technology
چکیده [English]

In this study, the effect of fatigue loading on the redistribution of mechanical residual stresses in compact tension specimens has been investigated. Fatigue crack growth experimental tests were conducted in accordance with E647 standard for specimens with and without initial residual stress. To investigate the crack tip plastic zone and fracture mechanics parameters finite element analysis using ABAQUS was used. The results showed that the initial residual stress redistributed after a few cycles of fatigue loading. Redistribution depends on the amplitude of cyclic loading. Near crack tip plastic zone area also decrease after a few cycles and reaches a stable value. In experimental tests, the fatigue life of specimens with mechanical residual stresses was lower than specimen having no residual stresses.

کلیدواژه‌ها [English]

  • Fatigue crack Growth
  • Crack Tip Plastic Zone
  • Redistribution of Residual Stress
  • J Integral
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