مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

کاربرد پردازش تصویر برای بررسی سطح شکست فولاد API X70 در آزمایش ضربه شارپی

نوع مقاله : پژوهشی اصیل

نویسندگان
حسین صمدیه لباف
سید حجت هاشمی
دانشگاه بیرجند
10.52547/mme.22.11.677
چکیده
آزمایش ضربه شارپی یک روش تجربی برای بررسی رفتار شکست دینامیکی مواد و مصالح مهندسی است که در دماهای مختلف بمنظور بررسی رفتار انتقال نرم به ترد مواد انجام می‌شود. محاسبه درصد شکست نرم و ترد سطح شکست نمونه شارپی با استفاده از روش‌های چشمی و مقایسه‌ای (طبق استاندارد API E23) انجام می‌شود که مقادیر دقیق شکست نرم و ترد را گزارش نمی‌کند. در این تحقیق، روشی برای محاسبه میزان دقیق درصد شکست نرم با استفاده از پردازش تصویر ارائه شده است که امکان بررسی قسمت‌های مختلف سطح شکست را به صورت کمی با دقت بالا فراهم می‌کند. مراحل پردازش تصویر برای سطح شکست یازده نمونه استاندارد شارپی از فولاد API X70 آزمایش شده در دمای 20+ تا 80- درجه سلسیوس و با فاصله دمایی ده درجه شرح داده می‌شود. در این تحقیق برای اولین بار تبدیل تصویر کیفی سطح شکست شارپی به یک ماتریس کمی از مقدار درصد شکست ترد انجام شده است. تصاویر سطح شکست در یک قالب یکسان، شبکه‌بندی شده و هر تصویر با بیان یک ماتریس کمی‌سازی می‌شود. امکان پیش‌بینی شکل قسمت‌های نرم و ترد از سطح شکست در دمای متفاوت در محدوده 20+ تا 80- درجه سلسیوس از نتایج این تحقیق است. مقدار شکست نرم با استفاده از پردازش تصویر برای دماهای20+، 0 ، 20-، 40-، 60- و 80- درجه سلسیوس به ترتیب100، 100، 86، 53، 36 و 0 درصد گزارش شده است. دمای انتقال برای فولاد آزمایش شده منطبق با شکست نرم 50 درصد، 45- درجه سلسیوس بدست آمد.
کلیدواژه‌ها
آزمایش ضربه شارپی
فولاد API X70
پردازش تصویر
سطح شکست نرم و ترد
لوله انتقال گاز

موضوعات

عنوان مقاله English

Application of image processing to study fracture surface of API X70 steel under Charpy impact test

نویسندگان English

Hosein Samadieh Labbaf
Sayyed Hashemi
University of Birjand
چکیده English

The Charpy impact test is an experimental method for determination of materials dynamic properties at different temperatures to investigate the ductile to brittle transition behavior of tested materials. The percentages of ductile and brittle fractures can be evaluated based on fracture area of Charpy specimen (according to API E23 standard) by visual techniques which do not provide exact percentages of these fractures. In this study, a method is proposed to calculate the exact percentage of ductile fractures using image processing, which makes it possible to quantitatively examine different parts of the fracture surface with high accuracy. All steps of image processing are described for eleven Charpy standard specimens of API X70 steel, tested at temperatures between +20 to -80 °C with a temperature increment of 10 °C. In this research, converting a qualitative image of fracture surface to a quantitative matrix is described for the first time. Prediction of the shape of ductile and brittle parts of the fracture surface at temperatures between +20 and -80 °C is one of the results of this study. The percentages of ductile fractures using image processing for temperatures of +20, 0, -20, -40, -40, -60 and -80 °C were obtained as 100, 100, 86, 53, 36 and 0, respectively. The transition temperature was -45 °C for this steel, corresponding of 50% ductile fracture.

کلیدواژه‌ها English

Charpy Impact Test
API X70 steel
Image processing
Ductile and Brittle fracture surface
Gas Transportation Pipeline
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مهندسی مکانیک مدرس
دوره 22، شماره 11
آبان 1401
صفحه 677-686