نشریه مهندسی مکانیک امیرکبیر

نشریه مهندسی مکانیک امیرکبیر

مدل پیش‌بینی شکست مبتنی بر آنتروپی برای فرایند خستگی ترمومکانیکی و هم‌دما

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران.
چکیده
هدف از این تحقیق ارزیابی رفتار خستگی ترمومکانیکی و هم‌دما نمونه‌ای از جنس اینکونل ۷۱۸ تحت شرایط بارگذاری مختلف است، که شامل خستگی کم‌چرخه در دماهای 350 و 650 درجه سانتی‌گراد و همچنین چرخه‌های بارگذاری حرارتی هم‌فاز و غیرهم‌فاز است. در این مطالعه، از ترکیب رویکرد مبتنی بر آنتروپی، مکانیک آسیب محیط پیوسته و تحلیل اجزای محدود برای بررسی پاسخ خستگی کم‌چرخه در سه دامنه بارگذاری مختلف استفاده شده است. نرم‌افزار آباکوس برای توسعه مدل اجزای محدود و کد سابروتین USDFLD برای ارزیابی مدل پیش‌بینی عمر خستگی به‌کار گرفته شده است. این مدل شامل یک مدل مبتنی بر آنتروپی است که از نظریه بولتزمن و مکانیک آسیب پیوسته استخراج شده است. در این بررسی، رشد آنتروپی و پارامتر آسیب انباشته محاسبه و تحلیل گردید. از نتایج به دست آمده و همچنین با بررسی تحقیقات انجام شده در گذشته، اعتبار مدل مبتنی بر آنتروپی برای تحلیل عمر و پارامتر آسیب انباشته در خستگی ترمومکانیکی و هم‌دما تایید می‌شود. یافته‌ها نشان می‌دهند که مدل مبتنی بر آنتروپی قادر است روند کاهش عمر و افزایش آسیب در شرایط ترمومکانیکی و هم‌دما را به‌طور دقیق پیش‌بینی کند و نتایج حاصل از آن با نتایج قبلی هم‌راستا است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

An Entropy-Based Failure Prediction Model for Thermomechanical and Isothermal Fatigue Process

نویسندگان English

zohreh shirazi
Bijan Mohammadi
School of Mechanical Engineering Iran University of Science andTechnology, Tehran, Iran
چکیده English

This work aims to evaluate the thermomechanical and isothermal fatigue behavior of an Inconel 718 specimen under various loading conditions, including low-cycle fatigue (LCF) at 350°C and 650°C, as well as in-phase (IP) and out-of-phase (OP) thermal loading cycles. An entropy-based approach combined with finite element analysis and continuum damage mechanics was used to examine the fatigue response under three different mechanical loading conditions. The ABAQUS program facilitated the development of the finite element model, while the model for predicting fatigue life was evaluated using the USDFLD subroutine code. The entropy-based approach, rooted in Boltzmann theory and continuum damage mechanics, enabled the calculation of entropy growth rates and damage accumulation parameters. The results show that the entropy-based method accurately captures the trends in fatigue life and damage formation under thermomechanical and isothermal fatigue conditions. These findings support previous experimental results, confirming the reliability and accuracy of the entropy-based model in predicting material degradation. This study highlights the value of using entropy as a precise parameter for assessing fatigue behavior, which is vital to developing more durable materials for high-performance applications.

کلیدواژه‌ها English

Boltzmann Theory
Damage Mechanics
Entropy Generation
Finite Element
Thermomechanical Fatigue
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