کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
790671 1466066 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The ratchet–shakedown diagram for a thin pressurised pipe subject to additional axial load and cyclic secondary global bending
ترجمه فارسی عنوان
نمودار چرخشی کششی برای یک لوله تحت فشار با توجه به بار محوری اضافی و خمش دوم ثانویه سیکل
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی


• A thin cylinder is subject to pressure and cyclic global bending and additional axial load.
• Ratchet and shakedown boundaries are derived analytically and using LMM.
• Good agreement is found.
• No ratcheting occurs for zero additional axial load.

The ratchet and shakedown boundaries are derived analytically for a thin cylinder composed of elastic-perfectly plastic Tresca material subject to constant internal pressure with capped ends, plus an additional constant axial load, F, and a cycling secondary global bending load. The analytic solution is in good agreement with solutions found using the linear matching method. When F is tensile, ratcheting can occur for sufficiently large cyclic bending loads in which the pipe gets longer and thinner but its diameter remains the same. When F is compressive, ratcheting can occur in which the pipe diameter increases and the pipe gets shorter, but its wall thickness remains the same. When subject to internal pressure and cyclic bending alone (F = 0), no ratcheting is possible, even for arbitrarily large bending loads, despite the presence of the axial pressure load. The reason is that the case with a primary axial membrane stress exactly equal to half the primary hoop membrane stress is equipoised between tensile and compressive axial ratcheting, and hence does not ratchet at all. This remarkable result appears to have escaped previous attention.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Pressure Vessels and Piping - Volume 134, October 2015, Pages 92–100
نویسندگان
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