مدلسازی ساختاری و عددی رفتار ویسکوالاستیک-ویسکوپلاستیک در بتن آسفالتی و جایگاه آن در عملکرد روسازی های آسفالتی
Constitutive and Numerical Modeling of Viscoelastic-Viscoplastic Behavior of Asphalt Concrete
دکتر محمد محمد کریمی، دانشکده مهندسی عمران، دانشگاه تربیت مدرس
چهارشنبه 26 شهریور 1399، ساعت 13:30 تا 15:00
لینک ورود:
https://vclass.ecourse.sharif.edu/ch/civil-seminar
نحوه ورود: مجانی و بدون نیاز به پسورد، بر روی گزینه “میهمان” کلیک و نام خود را وارد کنید.
Bio
Mohammad M. Karimi is Assistant Professor of Road and Transportation in the Department of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran. He received his B.Sc. degree in Civil Engineering from Iran University of Science Technology, and M.Sc. and Ph.D. degrees in pavement engineering, both from Sharif University of Technology (Supervisor: Prof. Nader Tabatabaee). Mohammad’s interests lie in the field of thermodynamic-based constitutive relationships, numerical implementation, and computational modeling of pavement materials and structures. Moreover, his research studies are often accompanied by experimental tests to identify the rheological and mechanical characteristics of pavement materials and to validate the numerical simulations. During his M.Sc., Ph.D., and the visiting researcher at University of Kansas, he has developed several kinds of research in the field of computational modeling of asphalt pavement, incorporating viscoelastic, viscoplastic-hardening relaxation, continuum damage, and coupled thermo-electromagnetic constitutive relationships. In recent years, he has been working on smart pavement materials, innovative methods of asphalt healing, and sustainable asphalt concrete and pavement structure using experimental evaluation and computational modeling.
Abstract
The pavement engineers always look for precise and cost-efficient methods to predict the long-term performance of asphalt concrete and pavement structure under the traffic loading and environmental conditions. A comprehensive numerical simulation leads to a precise analysis of pavement materials and structures while taking lower costs compared to accelerated pavement testing machines and test tracks. Given the intricate thermo-mechanical behavior of asphalt concrete, developing an appropriate constitutive relationship becomes the most imperative phase in the computational modeling of asphalt concrete and pavement. Computational scientists often derive constitutive relationships according to the thermodynamic laws and phenomena observed in experimental tests. In this webinar, several findings on the derivation of constitutive relationship, numerical implementation, computational modeling of asphalt concrete and pavement, and relevant experimental tests and field measurement will be presented. A non-linear viscoelastic constitutive relationship was developed to address the different stress transferring mechanisms in asphalt concrete under tensile and compressive stress modes. A viscoelastic-viscoplastic-continuum damage constitutive model was coupled with a hardening relaxation model to simulate the viscoplastic strain and hardening-softening in asphalt concrete under the cyclic loading. Then, a large strain-based viscoelastic-viscoplastic constitutive relationship carried out to predict the compaction process of asphalt concrete in the field will be discussed. As the last case, a coupled-thermo-mechanical-electromagnetic constitutive relationship to compute the temperature rising and crack healing through induction heating-induced healing in asphalt concrete under the electromagnetic field will be covered.