ANALISIS STATIK PENGARUH VARIASI MATERIAL RANGKA KURSI RODA HEWAN LIPAT MENGGUNAKAN METODE ELEMEN HINGGA

Kelumpuhan jangka panjang akan memiliki efek samping pada kesehatan dan kualitas hidup hewan. Untuk meningkatkan mobilitas, kualitas hidup hewan lumpuh, dan memberikan alternatif pendekatan yang lebih hemat dari biaya untuk operasi, maka dirancang sebuah kursi roda hewan. Kursi roda hewan yang digunakan diharapkan memiliki kekuatan dan ketahanan yang baik serta aman digunakan agar memudahkan hewan dalam beraktivitas. Pada penelitian ini dilakukan analisis pembebanan statik sebesar 60 N, 70 N, dan 80 N pada rangka kursi roda hewan untuk mendapatkan nilai tegangan, deformasi, dan faktor keamanan dengan membandingkan material rangka kursi roda hewan yang terbuat dari Aluminium 6063-T5 dan PVC dengan mengaplikasikan Metode Elemen Hingga menggunakan perangkat lunak berbasis Computer Aided Engineering (CAE). Setelah dilakukan pengujian, didapatkan bahwa nilai tegangan terbesar terjadi pada Aluminium 6063-T5 pembebanan 80 N sebesar 69.76 MPa, nilai deformasi terbesar terjadi pada PVC pembebanan 80 N sebesar 7.95 cm, dan nilai faktor keamanan terbesar terjadi pada Aluminium 6063-T5 pembebanan 60 N sebesar 2.8 yang dapat dikatakan berkualitas baik. Ketiga variabel ini dipengaruhi oleh nilai pembebanan dan modulus elastisitas, dimana nilai modulus elastisitas pada Aluminium 6063-T5 lebih besar dibandingkan PVC. Berdasarkan pengujian tersebut, maka perancangan rangka kursi roda hewan lipat disarankan menggunakan Aluminium 6063-T5

Pengaruh Jumlah Ulir dan Variasi Beban terhadap Kekuatan Sambungan Cap dan Tabung Roket Dextrose Menggunakan Metode Elemen Hingga

Kajian ini bertujuan untuk meneliti pengaruh jumlah ulir dan variasi beban terhadap kekuatan sambungan cap dan tabung roket Dextrose menggunakan metode elemen hingga. Cap dan tabung roket menggunakan Al 6063-T5. Ulir yang digunakan yaitu jenis ulir persegi dengan variasi jumlah ulir 5 dan 6 buah. Pembebanan divariasikan 4, 5, 6, dan 7 kN. Analisis elemen hingga dilakukan dengan bantuan software Ansys Workbench. Hasil simulasi tegangan statis menunjukkan semakin besar pembebanan, maka semakin tinggi tegangan von Mises maksimum. Tegangan von Mises maksimum menurun seiiring peningkatan jumlah ulir. Sambungan ulir persegi dengan variasi jumlah ulir 5 dan 6 dapat menahan beban statis hingga 6 kN karena memiliki faktor keamanan lebih dari 1,25

Influence of welding parameters on grain size, HAZ and degree of dilution of 6063-T5 alloy: optimization through the Taguchi method of the GMAW process

The aim of this work is to design experiments using Taguchi’s method that determine the influence of welding parameters on the grain size, heat-affected zone and degree of dilution of the 6063-T5 alloy. The welding process used is GMAW, and the welding parameters are the power, welding speed and bevel spacing. The study of the influence of these welding parameters on the measurements made during welding (which are the size of the heat-affected zone, the degree of dilution and the grain size) allows one to determine the quality of the joint. In addition, the welding parameter that most influences the minimisation of these three measurements will be determined.Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature

Study of the transient temperature profiles induced by changes of the welding parameters during aluminium two plate arc butt-welding

The numerical study and calculation of transient temperatures developing during the arc-welding process of 6063 T5 aluminum plates is presented. The mathematical model is based on the differential energy conservation equation. The governing equation is solved via numerical simulation using the finite control volume method to obtain the three dimensional and transient temperature profiles induced during the welding process. The moving heat source is considered as represented by a centered Gaussian-Bell distribution, while the base material is assumed to be homogeneous and isotropic with temperature-dependent thermal properties. Radiation and convection are computed and introduced into the model through the boundary conditions as an empirical temperature-dependent correlation. Phase-change phenomenon is included as a discontinuity in the material specific heat. Computed results show the influence of the variation of the welding parameters such as the arc power and welding speed on the computed transient temperatures, penetration and process efficienc

Deformation-based design of aluminium alloy beams

Two series of simply supported bending tests on aluminium alloy square and rectangular hollow sections have been performed. The test program comprised 14 three-point bending tests and 15 four-point bending tests. The test specimens were fabricated by extrusion from grades 6061-T6 and 6063-T5 heat-treated aluminium alloys, with width-to-thickness ratios ranging from 2.8 to 20.5. Measured geometric and material properties, together with the full load–deflection histories from the test specimens, were reported. Observed failure modes included local buckling, material yielding and tensile fracture. Further experimental data were gathered from the literature. Finite element (FE) models were developed and validated against the test results, and then used to perform parametric studies, in which a total of 132 numerical results were generated. The experimental and numerical results were used to evaluate the bending resistance provisions of the American [1], Australian/New Zealand [2] and European [3] Specifications, as well as the continuous strength method (CSM). The moment capacities predicted by the three design specifications were found to be generally conservative, while the CSM provided more accurate and more consistent predictions due to the recognition and systematic exploitation of strain hardening

Desarrollo de una silla de ducha para adultos mayores

El aumento en el promedio de la expectativa de vida hace necesario el desarrollo de nuevos productos para adultos mayores con el fin de mejorar su calidad de vida y otorgarles una mayor seguridad, confort y confianza para realizar sus actividades diarias -- En el caso de este proyecto se pretende presentar una solución, la cual consiste en el desarrollo de un sistema de descanso para la ducha (silla), a partir del rediseño de una silla desarrollada anteriormente, facilitándole el procedimiento de tomar una ducha, dadas las necesidades que se detectaron en la investigación de mercado -- Se aplicó una metodología de diseño y desarrollo de productos, según los conocimientos adquiridos por los autores en el pregrado de ingeniería de diseño de producto, que se define en 5 etapas: planeación, desarrollo de concepto, diseño a nivel sistema, diseño de detalle, pruebas y refinamient

EXPERIMENTAL ANALYSIS OF THE INFLUENCE OF HEAT SINK GEOMETRIC PARAMETERS ON NATURAL CONVECTION

In this work, the steady state heat transfer by natural convection in heat sinks with rectangular fins positioned vertically and horizontally was studied. The heat transfer by radiation was also considered. Several analyses were performed to determine the optimal number and position of the sensors used to measure the temperature on the heat sinks horizontally and vertically positioned. These analyses confirmed an almost uniform temperature distribution in the heat sink. This uniformity allowed the use of thermocouples only in the center of the heat sink. Twelve heat sinks were designed to study how their geometric parameters such as height, spacing and thickness of the fins, influence the heat transfer by free convection. In addition, in this work, two correlations using the dimensionless parameters Nusselt and Rayleigh are proposed. These correlations were obtained by using the results from the 12 heat sinks vertically and horizontally positioned considering a temperature range between 20 °C and 100 °C. Furthermore, studies were done to identify which of the 12 analyzed heat sinks managed to remove the greatest amount of heat in a given temperature range. The results were compared with those obtained from empirical correlations found in literature

Numerical and Experimental Investigation of a Reference Aluminium Bolted Joint

In the herein presented paper the structural response of aluminium alloy bolted joints under tension is numerically and experimentally investigated. For the purpose of this research activity, the equivalent T-stub reference joint has been used and all special features of the employed structural aluminium have been incorporated into the mechanical model of the component. The proposed finite element model has been next calibrated with regard to test results obtained by an extensive laboratory programme. The aim of the aforementioned research effort was to contribute to the broadening of the knowledge on the behaviour of the aluminium bolted joints under tension by validating and calibrating the proposed numerical model comparing it with the results of a sequence of experimental tests. Certain important aspects of the numerical treatment of the problem, namely, strain-hardening and contact phenomena, along with comparisons to relevant experimental results, are included in the paper. In addition, both the codified failure mechanisms described in Eurocode 9 and the possible theoretical yield patterns have been verified, whereas in the meantime useful conclusions concerning the development of post-elastic failure zones on aluminium flanges of the T-stub have been reached