تحلیل کمانش برشی ورق‌های کامپوزیتی چندلایه حاوی ترک‌های ماتریسی با رویکرد ترکیبی تئوری تغییر شکل برشی مرتبه بالا و مدل آسیب تجربی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی هوافضا، دانشگاه صنعتی مالک اشتر، تهران، ایران

2 استاد، دانشکده مهندسی هوافضا، دانشگاه صنعتی مالک اشتر، تهران، ایران

3 دانشیار، دانشکده مهندسی هوافضا، دانشگاه صنعتی مالک اشتر، تهران، ایران

4 استادیار، گروه مهندسی هوافضا سازه هوایی، دانشگاه هوایی شهید ستاری، تهران، ایران

چکیده
مقدمه: سازه‌های چندلایه کامپوزیتی با وجود نسبت استحکام به وزن بالا، نسبت به نقص‌های ساختاری نظیر ترک‌های ماتریسی حساسیت زیادی دارند. این ترک‌ها که معمولاً در فرآیند ساخت یا مراحل اولیه بارگذاری ایجاد می‌شوند، می‌توانند ظرفیت باربری سازه را به‌ویژه در مود کمانش برشی به‌طور قابل‌توجهی کاهش دهند. هدف این پژوهش بررسی تأثیر ترک‌های ماتریسی بر رفتار کمانش برشی ورق‌های کامپوزیتی ضخیم و ارائه مدلی تحلیلی برای پیش‌بینی این رفتار است.
روش:در این پژوهش از یک مدل تحلیلی مبتنی بر تئوری تغییر شکل برشی مرتبه بالا با ۱۱ درجه آزادی استفاده شده است که بدون نیاز به ضریب تصحیح برشی، توزیع سهموی تنش‌های برشی و اثرات کرنش نرمال عرضی را مدل‌سازی می‌کند. همچنین پارامترهای افت سفتی ناشی از ترک به‌صورت مستقیم از نتایج آزمون‌های تجربی کشش در مدل اعمال شده‌اند. معادلات حاکم با استفاده از اصل کمینه انرژی پتانسیل استخراج و به روش گلرکین حل شده‌اند.
یافته‌ها: نتایج نشان داد که پارامترهای چگالی ترک ماتریسی، نسبت ضخامت به طول ورق و زاویه چیدمان الیاف تأثیر قابل‌توجهی بر بار بحرانی کمانش برشی دارند. با افزایش چگالی ترک، کاهش بار بحرانی تشدید شده و در چیدمان [45±]s و چگالی ۱ ترک بر میلی‌متر، بار کمانش تا ۶۴ درصد کاهش یافت. همچنین نتایج مدل پیشنهادی با حل‌های سه‌بعدی الاستیسیته و شبیه‌سازی اجزای محدود تطابق مناسبی نشان داد.
نتیجه‌گیری: مدل پیشنهادی از دقت و کارایی مناسبی در پیش‌بینی رفتار کمانش برشی ورق‌های کامپوزیتی دارای ترک ماتریسی برخوردار است و می‌تواند به‌عنوان ابزاری مؤثر برای تحلیل و طراحی سازه‌های کامپوزیتی آسیب‌دیده مورد استفاده قرار گیرد. همچنین نتایج بیانگر تأثیر چشمگیر ترک‌های ماتریسی بر کاهش ظرفیت باربری سازه‌ها است.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

shear Buckling Analysis of Laminated Composite Plates Containing Matrix Cracks Using a Hybrid Approach of Higher-Order Shear Deformation Theory and Experimental Damage Model

نویسندگان English

keramat khodamorady 1
Keramat Malakzadeh Fard 2
seid mehdi nabavi 3
reza sarhkosh 4
1 Ph.D. Candidate, Faculty of Aerospace Engineering, Malek Ashtar University of Technology, Tehran, Iran
2 Professor, Faculty of Aerospace Engineering, Malek Ashtar University of Technology, Tehran, Ira
3 Associate Professor, Faculty of Aerospace Engineering, Malek Ashtar University of Technology, Tehran, Iran
4 Assistant Professor, Department of Aerospace Engineering (Aircraft Structures), Shahid Sattari Aeronautical University, Tehran, Iran
چکیده English

Introduction: Multilayered composite structures are widely used in aerospace and engineering applications due to their high strength-to-weight ratio. However, their structural performance is highly sensitive to manufacturing defects, particularly matrix cracks, which can significantly reduce the critical load-bearing capacity and accelerate buckling failure under shear loading. Therefore, developing accurate analytical models capable of accounting for damage-induced stiffness degradation is essential for reliable structural design.
Methods: An advanced analytical model was developed to predict the critical shear buckling load of thick laminated composite plates containing matrix cracks. The formulation is based on a higher-order shear deformation theory (HSDT) with 11 degrees of freedom, which accurately captures the parabolic distribution of transverse shear stresses and transverse normal strain effects without requiring shear correction factors. Stiffness degradation parameters resulting from matrix cracking were directly incorporated into the model using experimental tensile test data. The governing equations were derived through the principle of minimum potential energy and solved using the Galerkin method.
Findings: The effects of matrix crack density (0–1 crack/mm), plate thickness-to-length ratio (a/h = 5–100), and fiber orientation angle (θ = 0°–90°) on the normalized critical shear buckling load and its reduction percentage were investigated. The results demonstrated that matrix cracking substantially decreases the buckling resistance of composite plates. For the [±45]s laminate configuration, a crack density of 1 crack/mm resulted in a reduction of up to 64% in the critical shear buckling load. Furthermore, the proposed analytical predictions showed excellent agreement with three-dimensional elasticity solutions and finite element simulations.
Conclusion: The developed HSDT-based analytical model provides an accurate and efficient tool for evaluating the shear buckling behavior of damaged thick composite plates. The results highlight the significant influence of matrix crack density on structural stability and demonstrate the necessity of considering experimentally determined stiffness degradation in buckling analyses of composite structures.

کلیدواژه‌ها English

Shear buckling
Matrix crack
Galerkin method
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  • تاریخ دریافت 13 آذر 1404
  • تاریخ بازنگری 27 دی 1404
  • تاریخ پذیرش 30 اردیبهشت 1405