نتایج جستجو برای: the finite element method
تعداد نتایج: 16277695 فیلتر نتایج به سال:
The fundamental frequencies and mode shapes of steel and carbon fiber–reinforced plastic (CFRP) cylindrical shells with steel inserts were investigated using finite element analysis and modal testing. The free-free boundary condition was tested with modal testing using the roving hammer method and verified by finite element analysis using ABAQUS. The results show good agreement between the test...
In the present study, the three-dimensional elastic discrete element method (DEM) and the elastic finite element method (FEM) analysis were, respectively, applied to the randomly distributed identical spheres as a granular target and to the cylindrical projectiles in order to clarify dynamic response during penetration. In the target, it was found that highly densified region was formed just ah...
در سالهای اخیر با توجه به وجود کامپیوترهای پیشرفته و توسعه روشهای عددی تمایل قابل توجه ای به آنالیز عددی سازه های بیتن مسلح در برابر بارهای ضربه ای بوجود آمده است. در این پایان نامه براساس روش ترکیبی المانهای محدود ومجزا (finite / discrete element, method) یک مدل تحلیلی از سازه بتن مسلح ارائه می گردد که امکان مدلسازی برخورد پرتابه ها ایجاد و رشد ترکهای پیشرونده، نفوذ پرتابه ها و کلیه رفتاره...
س? ?? طٌافی م?ب? ز? ا یِشطییی یه سی?یه خسیس ? س???? ی?بفش? سه?یط ثطزاضی ی? ثبقس و? ?سف ??بیی آ آقیبض?بظی ?بذشبض م?ب? ش?ی یه خ? ثط ا?ب? ا س?اظ? یٌطی اظ ? حُ آ ی? ثبقس. ای ض? ییی اظ اضظا ش?طی ? ?ب ش?طی ض? ?بی سه?یطثطزاضی ی? ثبقس. زض س? ?? طٌافی م?ب? ز? ا یِشطییی خطیب و?چه ? ش??ب?ثی ض?ی ط?ظ ح?ی سعضیک ی? طٌزز ? ? شبغ?بی ایدبز قس? ض?ی ط?ظ ا س?اظ? یٌطی ی? ق?ز. ثبسعضیک خطیب ?ثس?ز آ?ضز ? شبغ?بی ش??بظط آ ??ب...
chapter one is devotod to collect some notion and background informations, which are needed in the next chapters. it also contains some important statements which will be proved in a more general context later in this thesis. in chapter two, we show that if the marginal factor-group is of order np1...pk,n>1, then we obtain a bound for the order of the verbal subgroup. also a bound for the bear-...
This paper presents the prediction of fatigue life and crack propagation in the railway wheel due to the stress field caused by mechanical loads and press fitting process of a railway wheel. A 3-D nonlinear stress analysis model has been applied to estimate stress fields of the railway wheel in press fitting process. Finite element analysis model is presented applying the elastic–plastic fin...
Graphene sheets are combined of Honeycombs lattice carbon-carbon bonds which have high natural frequencies, high strength, and high conductivity. Due to important applications of the graphene sheets particularly at higher frequencies, the study of their dynamic behavior is important in this frequency range. From Molecular Dynamics (MD) point of view as the dimensions of graphene sheet incline, ...
numerical modeling of machining processes is of significance in the parametric analysis and optimization of their performance. in this paper, a finite element-based model of abrasive waterjet (awj) cutting of a ductile material is presented with the help of an explicit, nonlinear finite element method. in this model, both solid-solid interaction and fluid-structure interaction are considered. t...
in this paper, simulation and analysis of thin steel cylindrical shells with elliptical cutouts under oblique loading were studied using finite element method. first, the numerical results were validated by the results of experimental test performed by an instron 8802 servo hydraulic machine. also, the effect of cutout angle (θ), cutout size, cutout position (l0/l) and cutout aspect ratios (b/a...
one of the most important number sequences in mathematics is fibonacci sequence. fibonacci sequence except for mathematics is applied to other branches of science such as physics and arts. in fact, between anesthetics and this sequence there exists a wonderful relation. fibonacci sequence has an importance characteristic which is the golden number. in this thesis, the golden number is observed ...
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