علوم و فناوری کامپوزیت

علوم و فناوری کامپوزیت

بررسی تجربی تأثیر توالی لایه‌چینی بر خواص مکانیکی و رفتار ضربه سرعت پایین کامپوزیت‌های هیبریدی کتان/اینگرا

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشیار، مهندسی مکانیک، دانشگاه بناب، بناب.
2 دانش‌آموخته کارشناسی‌ارشد، مهندسی مکانیک، دانشگاه تهران، تهران.
10.22068/jstc.2026.2090920.1958
چکیده
در این پژوهش، اثر توالی لایه‌چینی بر خواص مکانیکی و رفتار ضربه سرعت پایین کامپوزیت‌های هیبریدی اینگرا/کتان به‌صورت تجربی بررسی شد. بدین منظور، دو آرایش متقارن [F₂/I₂]ₛ و [I₂/F₂]ₛ به روش لایه‌چینی دستی ساخته و تحت آزمون‌های کشش، خمش و ضربه سرعت پایین قرار گرفتند. آزمون ضربه در سه سطح انرژی J5.64 ، J11.28 و J22.56 انجام شد و پاسخ نمونه‌ها با استفاده از منحنی‌های نیرو - زمان، نیرو - جابجایی و انرژی جذب‌شده - زمان ارزیابی گردید. نتایج کشش نشان داد که نمونه [I₂/F₂]ₛ با استحکام کششی 75 مگاپاسکال و مدول کششی 5.08 گیگاپاسکال عملکرد بهتری نسبت به نمونه [F₂/I₂]ₛ با استحکام 71 مگاپاسکال و مدول 4.51 گیگاپاسکال دارد. در آزمون خمش استحکام خمشی نمونه [F₂/I₂]ₛ 128 مگاپاسکال و مدول خمشی 0.095 گیگاپاسکال به دست آمد، در حالی که نمونه [I₂/F₂]ₛ کرنش خمشی بیشتری (5.75%) از خود نشان داد. همچنین، نتایج آزمون ضربه نشان داد که قرارگیری الیاف کتان در لایه‌های سطحی موجب افزایش نیروی بیشینه در سطوح انرژی متوسط و بالا شد، در حالی که قرارگیری الیاف اینگرا در لایه‌های بیرونی با ایجاد منحنی‌های نیرو - زمان متقارن‌تر، کاهش تدریجی‌تر نیروی تماس و تأخیر در گسترش آسیب‌های داخلی، موجب بهبود عملکرد ضربه‌ای کامپوزیت گردید.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Experimental Investigating the Effect of Stacking Sequence on Mechanical Properties and Low-Velocity Impact Behavior of Flax/Innegra Hybrid Composites

نویسندگان English

Hadi Rezghi Maleki 1
Babak Abazadeh 1
Pooya Parvandeh 2
1 Department of Mechanical Engineering, University of Bonab, Bonab, Iran.
2 School of Mechanical Engineering, University of Tehran, Tehran, Iran .
چکیده English

In this study, the effect of stacking sequence on the mechanical properties and low-velocity impact behavior of hybrid Innegra/flax composites was experimentally investigated. Two symmetric stacking sequences, [F₂/I₂]ₛ and [I₂/F₂]ₛ, were fabricated using the hand lay-up technique and subjected to tensile, flexural, and low-velocity impact tests. Low-velocity impact tests were conducted at three impact energy levels of 5.64, 11.28, and 22.56 J. The impact response was evaluated using force–time, force–displacement, and absorbed energy–time curves. The tensile results revealed that the [I₂/F₂]ₛ laminate exhibited superior mechanical performance, achieving a tensile strength of 75 MPa and a tensile modulus of 5.08 GPa, compared with 71 MPa and 4.51 GPa for the [F₂/I₂]ₛ laminate. In the flexural test, the [F₂/I₂]ₛ laminate exhibited a flexural strength of 128 MPa and a flexural modulus of 0.095 GPa, whereas the [I₂/F₂]ₛ laminate showed a higher flexural strain of 5.75%. Furthermore, the impact results demonstrated that placing flax fibers in the outer layers increased the peak impact force at intermediate and high impact energy levels. In contrast, positioning Innegra fibers in the outer layers produced more symmetric force–time responses, a more gradual reduction in contact force, and delayed the propagation of internal damage, thereby enhancing the overall impact performance of the hybrid composite.

کلیدواژه‌ها English

Mechanical behavior
hybrid composites
low-velocity impact
stacking sequence
energy absorption
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