scholarly journals Model Estimasi Karakteristik Modul Photovoltaic Polycrystalline dan Monocrystalline 50 Wp

2019 ◽  
Author(s):  
Rusman Sinaga ◽  
Marthen Dangu Elu Beily
Keyword(s):  
Polycrystalline Model

Rasio elektrifikasi di Kabupaten Kupang masih 60%. Rata-rata rumah tangga yang belum mendapatkan pasokan listrik berada di perdesaan terpencil yang sulit dijangkau oleh jaringan PLN. Alternatif yang paling baik dalam penyediaan sumber energi listrik di perdesaan Kabupaten Kupang yang belum terjangkau oleh jaringan PLN adalah menggunakan modul PV. Tujuan penelitian ini adalah untuk membandingkan efisiensi modul PV bahan monocrystalline dengan polycrystalline dan menemukan model estimasi karakteristik modul PV pada saat musim kemarau. Metode yang digunakan dalam penelitian ini adalah metode observasi yaitu melakukan pengukuran variabel SR, S, ISC dan VOC. Hasil penelitian menunjukkan bahwa modul PV monocrystalline lebih efisien dibandingkan dengan modul PV polycrystalline. Pada penggunaan modul PV monocrystalline, model estimasi persamaan regresi adalah Isc = 0.0009 SR + 1.9497 dan Voc = 28.02 - 0.2683 S. Pada penggunaan modul PV polycrystalline model estimasi persamaan regresi adalah Isc = 0.001 SR + 1.6649 dan Voc = 25.644 - 0.2196 S.

scholarly journals Study on a New Forming Method—Thread Rolling by Crystal Plasticity Finite Element Simulation

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 503
Author(s):  
Yuheng Zhang ◽  
Zhiqing Hu ◽  
Liming Guo
Keyword(s):  
Finite Element ◽  
Crystal Plasticity ◽  
Strain Curve ◽  
Forming Process ◽  
Crystal Plasticity Finite Element ◽  
Pole Figures ◽  
Grain Orientations ◽  
Thread Rolling ◽  
Polycrystalline Model ◽  
High Consistency

In order to study a new thread rolling forming process from a microscopic perspective, a polycrystalline model was established, based on the crystal plasticity finite element method (CPFEM) and Voronoi polyhedron theory. The fluidity of metals was studied to explain the reason for the concave center. The simulation results show that the strain curve of the representative element can more truly reflect the deformation behavior of the material. The grain orientations after deformation are distributed near the initial orientation. The evolution of each slip system is determined by the initial grain orientations and grain locations. The pole figures obtained from the experiment show high consistency with the pole figures obtained by simulation, which verifies the accuracy of the texture prediction by CPFEM. The experimental results show that thread rolling is more uniform in deformation than ordinary rolling.

scholarly journals Predicting the Tensile Behavior of Ti-6.6Al-3.3Mo-1.8Zr-0.29Si Alloy via the Temperature-Dependent Crystal Plasticity Method

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3138
Author(s):  
Jun Zhang ◽  
Yang Wang ◽  
Peng Wang ◽  
Junhong Chen ◽  
Songlin Zheng
Keyword(s):  
Crystal Plasticity ◽  
Experimental Results ◽  
Uniaxial Tensile ◽  
Published Data ◽  
Initial Yield Stress ◽  
Polycrystal Plasticity ◽  
Different Temperatures ◽  
Polycrystalline Model ◽  
Critical Resolved Shear Stress ◽  
Relationship Of

Uniaxial tensile flow properties of a duplex Ti-6.6Al-3.3Mo-1.8Zr-0.29Si alloy in a temperature range from 213 K to 573 K are investigated through crystal plasticity modelling. Experimental results indicate that the initial yield stress of the alloy decreases as the temperature increases, while its work-hardening behavior displays temperature insensitivity. Considering such properties of the alloy, the dependence of the initial critical resolved shear stress (CRSS) on temperature is taken into account in the polycrystal plasticity modelling. Good coincidence is obtained between modelling and the experimental results. The determined values of CRSS for slip systems are comparable to the published data. The proposed polycrystalline model provides an alternative method for better understanding the microstructure–property relationship of α + β titanium alloys at different temperatures in the future.

An Improvement of Multiaxial Ratchetting Modeling Via Yield Surface Distortion

2002 ◽  
Vol 124 (4) ◽  
pp. 402-411 ◽  
Author(s):  
Ludovic Vincent ◽  
Sylvain Calloch ◽  
Tadeusz Kurtyka ◽  
Didier Marquis
Keyword(s):  
Stainless Steel ◽  
Yield Surface ◽  
Constitutive Equations ◽  
316L Stainless Steel ◽  
Constitutive Laws ◽  
Theoretical Studies ◽  
Type 316L ◽  
Polycrystalline Model ◽  
Yield Surface Distortion ◽  
Type 316L Stainless Steel

Many theoretical studies have been made to describe multiaxial ratchetting and most of them have been concentrated on the location of the yield domain, not on its shape. In this paper, we introduce nonlinear kinematic constitutive equations consistent with ratchetting modeling into the distortional model of subsequent yield surfaces proposed by Kurtyka, T., and Zyczkowski, M. We use an efficient polycrystalline model to simulate complex tests including yield surface detections in order to get some reference predictions to use in the development of the constitutive laws introduced into the distortional model. The distortional model is thus qualitatively identified with the polycrystalline model and then quantitatively identified with the experimental results on a type 316L stainless steel. It gives promising results.

Application of a Computational Micro-Electro-Mechanical Model for the Prediction of Self-Heating of Ferroelectric Ceramic Materials

Aerospace ◽  
2003 ◽  
Author(s):  
Lisa Mauck Weiland
Keyword(s):  
Ceramic Materials ◽  
Ferroelectric Ceramic ◽  
Ferroelectric Materials ◽  
Material Behavior ◽  
Combined Loading ◽  
Self Heating ◽  
Heating Effects ◽  
Rate Effects ◽  
Polycrystalline Model ◽  
Insight Into

Application of ferroelectric materials in devices subject to high fields and a range of drive frequencies is becoming increasingly common. As a result, self-heating of these devices is of concern. An energy based polycrystalline model including thermal and rate effects has been developed. The model has been developed from the thermodynamics of piezoelectrics, and includes elastic, dielectric, and piezoelectric anisotropy. It captures ferroelectric and ferroelastic switching under combined loading. In the current work the model is expanded to include self-heating effects. Model results are compared to experimental data. Results from the model give insight into material behavior.

Yield Surface and Complex Loading Path Simulation of a Duplex Stainless Steel Using a Bi-Phase Polycrystalline Model

2007 ◽  
Vol 567-568 ◽  
pp. 141-144 ◽  
Author(s):  
Pierre Evrard ◽  
Veronique Aubin ◽  
Suzanne Degallaix ◽  
Djimedo Kondo
Keyword(s):  
Stainless Steel ◽  
Uniaxial Tension ◽  
Compression Test ◽  
Plastic Anisotropy ◽  
Constant Strain Rate ◽  
Loading Path ◽  
Model Parameters ◽  
Proportional Loading ◽  
Loading Paths ◽  
Polycrystalline Model

In order to model the elasto-viscoplastic behaviour of an austenitic-ferritic stainless steel, the model initially developed by Cailletaud-Pilvin [1] [2] and used for modeling single-phase polycrystalline steel is extended in order to take into account the bi-phased character of a duplex steel. Two concentration laws and two local constitutive laws, based on the crystallographic slips and the dislocation densities, are thus simultaneously considered. The model parameters are identified by an inverse method. Simple tests among which tension test at constant strain rate and at different strain rates and uniaxial tension-compression test are used during the identification step. The predictive capabilities of the polycrystalline model are tested for non-proportional loading paths. It is shown that the model reproduces the over-hardening experimentally observed for this kind of loading paths. Then, yield surfaces are simulated during a uniaxial tension-compression test: it is shown that the distortion (i.e. plastic anisotropy induced by loading path) is correctly described.

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