اثرات سرعت بارگذاری و جهت انتشار ترک بر چقرمگی شکست بین لایه‌ای در کامپوزیت‌های پایه پلیمری: یک مطالعه تحلیلی و تجربی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران.

چکیده

در این تحقیق اثرات جهت انتشار ترک و سرعت بارگذاری در مود اول شکست بر روی چقرمگی شکست به شکل تحلیلی و تجربی مطالعه شده است. در مود اول بازشوندگی دهانه ترک چیدمان الیاف در دو حالت متفاوت بررسی شده و انتشار ترک در جهت موازی با الیاف و عمود بر جهت الیاف آزمایش شده است. برای انجام آزمون‌های خمش سه نقطه‌ای، نمونه‌های آزمایشی مطابق با استاندارد طراحی و ساخته شدند. هدف از انجام آزمایش بارگذاری و اندازه گیری چقرمگی شکست در جهات مختلف انتشار و رشد ترک نسبت به زاویه الیاف می‌باشد. علاوه بر این، مجموعه‌ای از نمونه‌های تیر یک سر گیردار دو لبه با اعمال تغییر زاویه بارگذاری نسبت به راستای فیکسچر مورد بررسی قرار گرفتند. درصد تغییرات چقرمگی شکست بین لایه‌ای در آزمایش‌های یک سر گیردار دولبه و خمش سه نقطه‌ای عرضی و خمش سه نقطه‌ای طولی به ترتیب 5/67%، 6/5 % و 3/93% می‌باشد. این تغییرات نشان می‌دهد که تفاوت بین چقرمگی شکست در منطقه رشد ترک برای نمونه‌های آزمایش یک سرگیردار دولبه نسبت به نمونه‌های خمش سه نقطه‌ای به دلیل ضخامت نمونه‎‌ها مقدار کمتری دارد.  نتایج نشان می‌دهد چقرمگی شکست بین لایه‌ای، هنگامی که ترک به موازات الیاف رشد می‌کند بسیار بیشتر از زمانی است که ترک در جهت عمود بر الیاف رشد می‌نماید. در ادامه دلایل فیزیکی این نتایج تجربی مورد بحث قرارگرفته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Load Acceleration and Crack Propagation Direction on Interlaminar Fracture Toughness In Polymer Matrix Composites: A Theoretical and Experimental Approaches

نویسندگان [English]

  • Ali Reza Sartipi
  • Ahmad Reza Ghasemi
University of Kashan
چکیده [English]

In this research, the effects of crack propagation and load speed in the first failure mode on failure toughness have been studied analytically and experimentally. In the first mode, the opening of the crack opening of the fiber layout was examined in two different modes and the release of the crack was tested in a direction parallel to the fibers and perpendicular to the direction of the fibers. To perform three-point bending tests, test samples are designed and built according to the standard. The purpose of the rate of speed has been evaluated by changing the loading angle relative to the fixture line. The percentage changes in interlaminar fracture toughness in double cantilever beam and transverse three-point bending and longitudinal three-point bending tests are 5/67%, 6/5%, and 3/93%, respectively. These changes indicate that the difference between fracture toughness in the crack growth region for double cantilever beam test specimens is smaller than that for three-point bending specimens due to the thickness of the specimens. The results show that interlayer failure toughness is much greater when the crack grows parallel to the fibers than when the crack grows perpendicular to the fibers. The physical reasons for these experimental results are discussed below.

کلیدواژه‌ها [English]

  • Fracture Toughness
  • Transverse Crack
  • Interlaminar Fracture
  • Three Point Bending (TPB)
  • Polymer Matrix Composites (PMCs)

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 56، شماره 11
بهمن 1403
صفحه 1575-1590

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