بررسی رفتار تناوبی پوسته‌های مکعبی از نوع SS316L تحت بارگذاری پیچشی خالص

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه فردوسی مشهد

2 فردوسی مشهد

3 صنعتی شاهرود

چکیده

در این مقاله به بررسی تجربی و عددی رفتار تناوبی پوسته­های مکعبی SS316L تحت بارگذاری پیچش خالص پرداخته ‌شده‌است. آزمایش­های تجربی توسط دستگاه سرو هیدرولیک اینسترون 8802 و در شرایط بارگذاری گشتاور پیچشی- کنترل انجام ‌شده‌است. در این شرایط بارگذاری و براساس نتایج تجربی، با افزایش دامنۀ گشتاور پیچشی، به‌دلیل وجود تنش­های برشی بزرگ‌تر در ضخامت پوسته­ها، زاویۀ رچتینگ افزایش‌ پیدا می‌کند و عمر پوسته کاهش می‌یابد. همچنین تأثیر وجود گشودگی دایره‌ای و اندازۀ آن برروی رفتار رچتینگ پوستۀ مکعبی بررسی شد که باتوجه به نتایج تجربی مشاهده شد که حساسیت زاویۀ رچتینگ به گشودگی در موقعیت­های نزدیک به محل اعمال بار بیشتر می‌باشد و عمر پوسته در این شرایط کاهش می‌یابد. تحلیل عددی توسط نرم‌افزار آباکوس و بااستفاده از مدل سخت‌شوندگی غیرخطی همسان‌گرد/ سینماتیک انجام شد که درمقایسه با نتایج تجربی از مطابقت خوبی برخوردار بود.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Cyclic Behavior of SS316L Cubic Shells under Pure Torsional Load

نویسندگان [English]

  • mahmoud Shariati 1
  • Amin Saber 1
  • Kamal Kolasangiani 2
  • Hadi Golmakani 3
1 Ferdowsi University of Mashhad
2 Ferdowsi University of mashhad
3 Shahrood University of Technology
چکیده [English]

In in this paper, cyclic behavior of SS316L cubic shells under pure torsional load was experimentally and numerically studied. Experimental tests were carried out by a servo-hydraulic NSTRON 8802 machine under torsional load-control condition. In this loading condition and based on experimental results, due to the existence of larger shear stress along the shell thickness, increasing of torsional torque amplitude caused the enhancement of ratcheting angle and reduction of shells’s life. Also, the effect of cutout and its size on ratcheting behavior of cubic shell were investigated , According to experimental results, it was seen that the sensitivity of ratcheting angle to cutout position near the applied load was high and the shell’s life decreases in this condition. Numerical analysis was done by Abaqus software and using the nonlinear isotropic/kinematic hardening model. There is a good agreement with that of experimental results.

کلیدواژه‌ها [English]

  • Cubic shell
  • cyclic pure torsional loading
  • ratcheting and softening
  • numerical and experimental analysis
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