International Journal of Structural Mechanics and Finite Elements
http://mechanical.journalspub.info/index.php?journal=JSMFE
International Journal Structural Mechanics and Finite Elements publish refereed papers in highest quality reflecting the interest of scholars in the academic and industrial research and development. Papers are sought especially keeping in mind that theoretical knowledge is as important as experimental research. The journal includes type of papers that fall under the scope of structural mechanics and finite elements.en-USInternational Journal of Structural Mechanics and Finite ElementsAn Optimum Stringer for Straight and Curved Stiffened Panels Using X-FEM Techniques
http://mechanical.journalspub.info/index.php?journal=JSMFE&page=article&op=view&path%5B%5D=733
In this study, crack growth, modeling and simulation of various stiffened stringers, unstiffened straight and curved cracked panels are presented using commercially available finite element software package. Computation of stresses and convergence of stress intensity factor for single-edge notch specimens computed using finite element method (FEM) and extended finite element method (X-FEM) and compared with analytical solution. X-FEM techniques like cohesive segment method and linear elastic fracture mechanics, using virtual crack closure technique, are used for crack growth simulation and presented results for unstiffened, stiffened and curved panels. The nonlinear analysis considering both geometric and material nonlinearity on both straight and curved panels stiffened with various stringers like straight, inverted L, T, and Z sections performed analyses. Quantified the maximum load-carrying capacity in each of the panels like unstiffened and stiffened in both the configurations of straight and curved panels. Arrived at the optimum stringer section type for the considered panel under axial loading from the numerical analysis.Krishna Lok SinghRajesh Reddy2018-11-202018-11-2042Bending Solutions of Fully Clamped Orthotropic Rectangular Thin Plate Using Finite Integral Transform Method
http://mechanical.journalspub.info/index.php?journal=JSMFE&page=article&op=view&path%5B%5D=745
Plate as an engineering material is used widely in several areas of Engineering work, especially civil engineering structures as slab. This research work presents the solutions to the bending of orthotropic thin rectangular plates, fully clamped at all edges and subjected to three different loading conditions such as uniformly distributed load, centrally loaded concentrated point load and hydrostatic pressure, using the finite integral transform method. The results derived from this study are tabulated so as to demonstrate the accuracy and validity of the procedure, and in turn compared with other studies so as to ascertain if they are in agreement. A deflection value of 0.00126 was obtained for clamped Isotropic rectangular thin plate with aspect ratio of 1.0 under uniform loading condition, which agrees with the value obtained in previous research. A value of 0.00563 was obtained for clamped Isotropic plate with aspect ratio of 1.0 under centrally loaded concentrated, while a value of 0.000081 was obtained for clamped Isotropic plate with aspect ratio of 1.0 under hydrostatic pressure load, which all agree with the values of 0.00560 and 0.00008 respectively obtained in previous research. Having validated this research method, it was then applied to orthotropic plate and deflection values of 0.00052, 0.00235 and 0.000259 were obtained under uniform load, concentrated load and hydrostatic load respectively having aspect ratio of 1.0. This means that unlike the conventional process of analysis in some literatures, it presents an accurately rational model in plate analysis. This research method can also be utilized extensively to solve various degree of thickness and load configuration on plates, as the procedure seems quiet simpler than most conventional methods of analysis.Temple NwoforOsere G.2019-01-022019-01-0242Finite Element Modeling of Deep Reinforced Concrete Beams with Web Openings
http://mechanical.journalspub.info/index.php?journal=JSMFE&page=article&op=view&path%5B%5D=790
The effects of openings on the ultimate capacity of deep beams have been studied experimentally by many researchers. However, there’s still need for analytical study using numerical methods and also the development of simple stiffness reduction models that can be easily used for quick prediction of the effects of opening sizes on the stiffness of deep reinforced concrete beams. This study is focused on modeling the behavior of deep reinforced concrete beams with web openings of various configurations and the development of simple mathematical models for stiffness reduction. A total of 20 deep beam models with small and large openings are analyzed using the finite element method. A computer program written in MATLAB was used in the analysis. The computer program was tested by analyzing a plane elasticity problem with known solution to validate the program before it was used in analyzing the deep beams. Results of the analysis shows that for a small opening of size 0.1 d, where d is the depth of the beam, the effect on the stiffness is relatively low. Only 1.2% reduction in stiffness is observed. Whereas for large openings, a reduction in stiffness of 8.4% is recorded for a 210 mm (0.35 d) square opening with centre located at 675 mm from the support. Three mathematical models have been formulated for the stiffness reduction factor as a function of the depth of opening to depth of beam ratio (β/d) for openings located at 0.45 ℓ, 0.25 ℓ and 0.35 ℓ, where ℓ is the shear span of the beam.Temple NwoforJeremiah J. J.2019-02-132019-02-1342FE Modelling and Analysis of Mixed Mode Delamination in Composite Laminates
http://mechanical.journalspub.info/index.php?journal=JSMFE&page=article&op=view&path%5B%5D=791
A composite is a structural material that consists of two or more constituents combined at a macroscopic level and not soluble in each other. The advantages of composites over conventional materials are its light weight, high strength, design flexibility, dimensional stability, etc. Although Composite materials are advantageous than conventional materials, there are some defects in composite materials too, which are Fibre-matrix debonding, fibre misalignment, Delamination, Matrix cracking, Impact damage, etc. Among these defects, Delamination is one of the major modes of failure for composite materials. VCCT is the study of damage based on the Energy Release rate of the material undergoing Delamination. Finite Element Model and Engineering analysis of various standard specimens such as DCB, ENF, SLB and MMB specimens have been carried out by using VCCT approach which covers Mode I, Mode II and Mixed mode (Mode I and II) Delamination. Method of modelling is predicted and validated for a DCB composite laminate specimen. This technique is inculcated in predicting the Delamination onset in flat composite laminate standard specimens as mentioned above. Various parametric studies on behaviour of delamination with different material properties, different crack lengths and ply orientation are also studied and their effect on Delamination behaviour is presented. Further the same approach has been applied to curved composite laminate and the behaviour of these laminates under Mode-I, Mode-II and Mixed Mode delamination has been studied.Supreeth S.Manjunath S. B2019-02-152019-02-1542Heat Exchanger Technology and Applications: Groundsource Heat Pump System for Buildings Heating and Cooling
http://mechanical.journalspub.info/index.php?journal=JSMFE&page=article&op=view&path%5B%5D=784
Some emphasis has recently been put on the utilisation of the ambient energy from ground source and other renewable energy sources in order to stimulate alternative energy sources for heating and cooling of buildings. Geothermal heat pumps (GSHPs), or direct expansion (DX) ground source heat pumps, are a highly efficient renewable energy technology, which uses the earth, groundwater or surface water as a heat source when operating in heating mode or as a heat sink when operating in a cooling mode. It is receiving increasing interest because of its potential to reduce primary energy consumption and thus reduce emissions of the greenhouse gases (GHGs). The main concept of this technology is that it utilises the lower temperature of the ground (approximately <32°C), which remains relatively stable throughout the year, to provide space heating, cooling and domestic hot water inside the building area. The main goal of this study is to stimulate the uptake of the GSHPs. Recent attempts to stimulate alternative energy sources for heating and cooling of buildings has emphasised the utilisation of the ambient energy from ground source and other renewable energy sources. The purpose of this study, however, is to examine the means of reduction of energy consumption in buildings, identify GSHPs as an environmental friendly technology able to provide efficient utilisation of energy in the buildings sector, promote using GSHPs applications as an optimum means of heating and cooling, and to present typical applications and recent advances of the DX GSHPs. The study highlighted the potential energy saving that could be achieved through the use of ground energy sources. It also focuses on the optimisation and improvement of the operation conditions of the heat cycle and performance of the DX GSHP. It is concluded that the direct expansion of the GSHP, combined with the ground heat exchanger in foundation piles and the seasonal thermal energy storage from solar thermal collectors, is extendable to more comprehensive applicationsAbdeen Mustafa Omer2019-02-152019-02-1542