نتایج جستجو برای: Finite element model

تعداد نتایج: 2401982  

Journal: :journal of agricultural science and technology 2010
m. rashidi a. tabatabaeefar a. keyhani r. attarnejad

a non-linear finite element model could be a useful tool in the development of a method of predicting soil pressure-sinkage behaviour, and can be used to investigate and analyze soil compaction. this study was undertaken to emphasize that the finite element method (fem) is a proper technique to model soil pressure-sinkage behaviour. for this purpose, the finite element method was used to model ...

Journal: :international journal of coastal and offshore engineering 0
younes komachi ocean engineering and technology research center, national institute for oceanography said mazaheri ocean engineering and technology research center, national institute for oceanography mohammadreza tabeshpour school of mechanical engineering, sharif university of technology

many procedures suggest for reduction of responses of riser to vortex induced vibrations (viv). natural frequencies of marine risers is an important parameter that can affect the responses of riser to viv. change of riser properties such as top tension and bending stiffness can alter natural frequencies. in this study effects of riser specifications on the responses and fatigue damage of marine...

Journal: :computational methods in civil engineering 2010
f. moghadas nejad m.r. shadravan

three dimensioned finite element analysis were conducted on concrete block paving. in order to verify the calculated results, an experimental case study was analyzed. good agreement was observed between the measured and the calculated results. based on the finite element analysis results and available failure models, comprehensive design charts were developed for port and industrial pavement wh...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان 1371

the effect of the presence of perforations on he stresses of a plate is a problem which is of great interest in structural design and in the mathemattical theory of elasticity. among the many hole patterns that are likely to require consideration is the ring of equally spaced circular holes. the present worke investigates stress & strain analysis of a thin isotropic circular plate containing a ...

Journal: :international clinical neurosciences journal 0
amirhossein saveh ali reza zali functional neurosurgery research center, shahid beheshti university of medical sciences, tehran, iran hamidreza haghighatkhah department of radiology, shohada-e tajrish hospital, shahidbeheshti university of medical sciences, tehran, iran morteza sanei taheri seyed morteza kazemi shahid beheshti university of medical sciences, akhtar orthopaedic research centre, tehran, iran mahmoud chizari school of design and engineering, brunel university west london, uk

background: the salvage proximal femoral osteotomy is performed in mild or moderate osteoarthritis when the articulating surfaces are normal and relieves the subject’s pain. because the importance of angular mal-alignment of the femur bone at the hip junction accurate pre-op planning based on patient specific anatomy is required to prevent any lower limb misalignment and joint problem pre-opera...

Journal: :journal of mechanical research and application 2009
mehdi tajdari kaveh abbasi

this paper presents an overview of model updating and particularly its application for updating of frame model. in this article a mathematical model of the frame was produced with finite element method. the frame was subjected to hammer modal testing. then the results of the modal testing were compared with those predicted with the model. this comparison revealed discrepancies between these two...

Journal: :journal of computational applied mechanics 0
zahra matin ghahfarokhi department of mechanical engineering, isfahan university of technology, isfahan, iran mehdi salmani tehrani department of mechanical engineering, isfahan university of technology, isfahan, iran mahdi moghimi zand school of mechanical engineering, college of engineering, university of tehran, tehran, iran mojtaba mahzoon department of mechanical engineering, university of shiraz, shiraz, iran

needle insertion is a minimally invasive technique in diagnosing and treating tumors. however, to perform a surgery accurately, the tissue should have minimum amount of displacement during needle insertion so that it reaches the target tissue. therefore, the tissue membrane has to move less to decrease rupturing under the membrane. in this study, the effect of different design parameters on dis...

Journal: :journal of structural engineering and geo-techniques 2012
islam ezz el-arab w gray

the welding in cold formed areas is not only an open question for statically loaded sections (brittle fracture) but also for dynamically loaded structures (fatigue resistance). a lot of structures are subjected to dynamic loadings and unfortunately very little information about the influence of welding in the cold formed areas on fatigue resistance is available. in order to establish the fatigu...

Journal: :علوم و تکنولوژی پلیمر 0
میرحمیدرضا قریشی

some numerical and experimental investigations are made on the performance of five different hyperelastic constitutive models (second order polynomial, yeoh, arruda-boyce, ogden and marlow) in tension and compressionmodes. first, the results of the tensile and compression tests on a rubber sample were used to determine the parameters of the models by curve fitting methods. next, by using an alg...

Displacement finite element models of various beam theories have been developed using traditional finite element interpolations (i.e., Hermite cubic or equi-spaced Lagrange functions). Various finite element models of beams differ from each other in the choice of the interpolation functions used for the transverse deflection w, total rotation φ and/or shear strain γxz, or in the integral form u...

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