تأثيرات الضرر الميكانيكي والحرارة المنحدر من نوع على اهتزاز الحرارية السيليكون نيتريد Nanobeam على أساس الأخضر -Naghdi نظرية النوع الثاني

Source
مكتبة الملك عبدالله بن عبدالعزيز الجامعية
Linked Agent
Youssef, Hamdy M., Thesis advisor
Alharthi, Hamzah, Thesis advisor
Alternative Title
Influences of The Mechanical Damage and Ramp-Type Heat on The Vibration of Thermoelastic Silicon Nitride Nanobeam Based on Green-Naghdi Theorem Type-II
Country of Publication
مكة المكرمة
Publisher
جامعة أم القرى
Language
eng
College
الهندسة والعمارة الإسلامية
Abstract

Robert Hooke is the first one who stated that "The power of any spring or elastic body is in the same proportion with the body’s extension" [1], while Cauchy who provided the governing equations of the linear theory of elasticity based on a fixed and known temperature (isothermal), and without any changes until now [2]. The problem of elasticity in a temperature transition is resolved at first by Duhamel. The conclusion deduced by Duhamel equations was repeated by Neumann, but in a different manner, it is considered the first theory of thermoelasticity, which is known as the uncoupled thermoelasticity theory. The first governing equation of this theory is the heat conduction equation (thermal equation), which is unrelated to the mechanical effect, while the second one is the equation of motion involves a known function of heat [3]. Danilovskaya was the first one who solved an actual problem based on thermoelasticity that is uncoupled with uniform heat. This hypothesis has two shortcomings. First, the hypothesis notes that the elastic body's mechanical condition has no impact on the temperature and does not conform to physical experiments. Second, the parabolic heat equation forecasts an infinite temperature spread speed, which contradicts again physical observations [3].

Description
77 ورقة
Category
Theses
Dewey Classification
24567
Format
ماجستير
Hijri Date
1442
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الهندسة الميكانيكية

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