بازرسی غیرمخرب عیوب صفحه‌ای به روش برش‌نگاری با تحریک فراصوتی مدوله شده

صباغی فرشی, سینا; اکبری, داوود

doi:10.30494/jndt.2024.424255.1133

بازرسی غیرمخرب عیوب صفحه‌ای به روش برش‌نگاری با تحریک فراصوتی مدوله شده

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران

10.30494/jndt.2024.424255.1133

چکیده

تشخیص زودهنگام عیوب زیرسطحی در نگهداری و توسعه سازه‌های ساخته شده از مواد مرکب بسیار حائز اهمیت است. لذا بهره‌گیری از آزمون‌های غیرمخرب برای افزایش قابلیت اطمینان سیستم و جلوگیری از ﺷﮑﺴﺖ ﻧﺎﺑﻪﻫﻨﮕﺎم اﺟﺰا در ﺣﯿﻦ ﮐﺎرﮐﺮد، ضرورت پیدا می‌کند. با این حال تشخیص عیب در مواد مرکب، به دلیل چندجزئی بودن و پیچیدگی پیکربندی و نیز گستردگی عیوب مختلف در این مواد، همیشه چالش‌برانگیز است. برش‌نگاری با تحریک داخلی عیب یکی از روش‌های نوین بازرسی غیرمخرب عیوب زیرسطحی است که با دریافت پاسخ سطحی عیب نسبت به بارگذاری صورت گرفته به تشخیص عیوب می‌پردازد. در این پژوهش، برش‌نگاری با بارگذاری فراصوتی مدوله شده در بازرسی غیرمخرب نمونه‌‌ای از جنس ماده مرکب زمینه پلیمری تقویت شده با الیاف شیشه به کار رفته و پارامترهای موثر بر تشخیص‌پذیری عیب صفحه‌ای مورد بررسی قرار گرفت و نتایج به دست آمده با روش معمول با بارگذاری فراصوتی دامنه ثابت مقایسه شد. در انجام آزمون برش‌نگاری با تکنیک مدوله کردن دامنه، برخلاف بارگذاری فراصوتی دامنه ثابت، عیب در هر سه فرکانس‌ تحریک و از طریق تصاویر فاز و دامنه به آسانی تشخیص داده شد. همچنین عیب در فرکانس تحریک 43 کیلوهرتز با بیش‌ترین وضوح تشخیص داده شد. نتایج حاصل از بررسی اثر فرکانس مدولاسیون بر تشخیص‌پذیری عیب در تصویر دامنه نشان داد مستقل از فرکانس تحریک پیزوالکتریک، عیب در پایین‌ترین فرکانس‌ مدولاسیون بیشترین قابلیت تشخیص را دارد. همچنین فرکانس تحریک پیزوالکتریک، اثر معناداری بر تغییرات اختلاف فاز و قابلیت تشخیص عیب در تصاویر فاز ندارد که می‌توان آن را نشان دهنده استقلال تصویر فاز از شرایط بارگذاری دانست.

کلیدواژه‌ها

موضوعات

روش‌ها و تکنیک‎ها

عنوان مقاله [English]

Non-destructive Testing of Planar Defects Using Shearography Method with Modulated Ultrasonic Excitation

نویسندگان [English]

sina Sabbaghi Farshi
Davood Akbari

Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran.

چکیده [English]

Early detection of sub surface defects is very important in the maintenance and development of structures made of composite materials. Therefore , it becomes necessary to use non - destructive tests to improve system reliability and prevent untimely failure of components during operation. However , due to the multi-component nature of the configuration , its complexity , and the extent of various defects in these materials , the detection of defects in composite materials is always difficult .So , there is important to develop some new and advanced methods to detect many of defects in these types of materials . Shearography or laser shearing interferometery , with internal excitation of the defect is one of the novel methods of non - destructive testing of subsurface defects , which detects defects by receiving the defect's surface response to the loading. In this article, a glass fiber-reinforced polymer specimen was subjected to non-destructive inspection using shearography with modulated ultrasonic loading. The parameters influencing the detectability of plane defects were studied , and the obtained results were compared with the usual constant - amplitude ultrasonic loading method . In shearography tests using the amplitude modulation technique , in contrast to the constant amplitude ultrasonic loading , the defect was easily detected at all three excitation frequencies and through the phase and amplitude images . Additionally , the highest resolution of defect detection was achieved at the 43 k Hz excitation frequency . The amplitude image results showed that the defect has higher detect - ability at lower modulation frequencies, regardless of the piezoelectric stimulation frequency . Furthermore , the phase difference changes and defect detect - ability in the phase images are not significantly affected by the piezoelectric excitation frequency , demonstrating the independence of the phase image and the modulating method from the loading conditions .

کلیدواژه‌ها [English]

Digital Shearography
Composites
Non-destructive Test
Piezoelectric
Modulation Frequency

مراجع

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