بررسی اثر سیکل حرارتی بر میزان بازیابی استحکام کششی در کامپوزیت‌های خودترمیم‌شونده تحت بار ضربه‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، مجتمع آموزش عالی لارستان، لار، ایران

2 پژوهشکده فناوری‌های نو، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

در پژوهش حاضر، فرآیند خودترمیمی نمونه‌های کامپوزیتی ساخته شده از جنس الیاف شیشه-اپوکسی بررسی شده است. عامل ترمیمی دوجزئی شامل رزین اپوکسی ML506 و هاردنر HA-11 است که درون میکرولوله‌هایی ذخیره شده و بین لایه‌های اول و دوم و نیز لایه‌های پنجم و ششم نمونه‌ها قرار گرفتند. آسیب اولیه توسط آزمون ضربه افتان ایجاد شده و نهایتاً با انجام آزمون کشش میزان بازیابی استحکام کششی نمونه‌ها بررسی شده است. اثر تعداد میکرولوله‌های حاوی عوامل ترمیم‌کننده، مدت زمان ترمیم (بدون اعمال سیکل حرارتی) و اعمال سیکل حرارتی بر فرآیند ترمیم نمونه‌های آسیب دیده مورد مطالعه قرار گرفت. بدین منظور نمونه‌هایی حاوی 8، 16 و 32 واحد ترمیمی در بازه‌های زمانی 1، 6 و 12 روزه بررسی شدند. علاوه بر این، تعدادی از نمونه‌ها پس از ایجاد آسیب اولیه، تحت 1، 3، 5 و 7 سیکل حرارتی قرار گرفته و پس از بازه زمانی یک روزه، آزمون کشش آنها انجام شد. نتایج به دست آمده نشان می‌دهد که بدون اعمال سیکل حرارتی فرآیند ترمیم پس از بازه 6 روزه تقریباً به صورت کامل انجام شده است (بازیابی 83 درصدی استحکام کششی). هرچند بیشترین میزان بازیابی استحکام کششی 86% است که برای نمونه حاوی 32 واحد ترمیمی و بعد از 12 روز حاصل می‌شود. همچنین می‌توان با اعمال 5 سیکل حرارتی بر نمونه آسیب‌دیده دارای 32 واحد ترمیم پس از گذشت یک روز تقریباً به همین میزان ترمیم دست یافت. ضمناً تاثیر سیکل حرارتی تا سیکل پنجم بوده و اعمال سیکل‌های حرارتی بعدی تاثیر چندانی بر تسریع فرآیند ترمیم و بازده آن ندارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the effect of thermal cycles on the recovery of tensile strength in self-healing composites under impact loading

نویسندگان [English]

  • Ali Talezadehlari 1
  • Ali Nikbakht 2
1 Department of Mechanical Engineering, University of Larestan, Lar, Iran
2 New Technologies Research Center (NTRC), Amirkabir University of Technology, Tehran, Iran
چکیده [English]

Here the healing process of glass/epoxy composites is studied experimentally. The healing agent is composed of ML506 epoxy resin and HA-11 hardener which is charged into microtubes. The microtubes are interleaved between the first and the second and the fifth and the sixth layers. The initial damage is introduced to the samples by drop weight impact tests and the recovery percentage of the tensile strength due to healing process is measured by tensile test. The effects of healing time (without thermal cycles), number of healing units and thermal cycles are investigated on the recovery of the tensile strength. Composite samples containing 8, 16 and 32 healing units are studied in the periods of 1, 6 and 12 days after the initial damage. Also, some damaged samples are set to 1, 3, 5 and 7 thermal cycles and after one day, tensile tests are carried out. The results show that without thermal cycles the healing process is almost completed after 6 days with an 83% recovery. In addition, the maximum amount of tensile strength recovery is equal to 86% which is related to the samples with 32 healing units after 12 days. This amount of healing efficiency can also be achieved by means of 5 thermal cycles. This is also true for thermal cycles where the effect of thermal cycles is tangible up to 5 cycles.

کلیدواژه‌ها [English]

  • Composites
  • self-healing materials
  • drop weight impact
  • tensile strength recovery
  • thermal cycle

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 55، شماره 2
اردیبهشت 1402
صفحه 159-178

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