List of Articles specific energy

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  1 - Analytical and Numerical Investigation of Energy Absorption in Graded Aluminum Open Cell Foam under Low Velocity Impact Loading
  S Davari S. A Galehdari A Atrian
  10.22034/jsm.2023.1987070.1777
  Given the significance of energy absorption in various industries, light shock absorbers such as structures made of metal foam have been considered. In this study, analytical equation of plateau stress is presented for an open cell foam based on the Gibson-Ashby model, More

  Given the significance of energy absorption in various industries, light shock absorbers such as structures made of metal foam have been considered. In this study, analytical equation of plateau stress is presented for an open cell foam based on the Gibson-Ashby model, which follows elastic perfectly plastic behavior. For comparison of acquired analytical equations, the problem for a cell and then for three cells that make up an aluminum open cell foam is simulated in ABAQUS/CAE. Using the stress strain diagram, plateau stress and densification strain equations, the specific energy absorbed of the open cell metal foam is extracted. The capacity of absorb energy for an aluminum open cell foam with three cell is obtained once using analytical equations and again by using numerical simulation in ABAQUS/CAE. Numerical results retain an acceptable accordance with analytical equations with less than 3% occurred error for absorbed energy. To ensure the accuracy of numerical simulation, the results of simulating are compared with the results of the simulation of the same foam in a reference whose accuracy is verified by the experiment. Based on the results, the effective cross-sectional area of the foam with Gibson-Ashby cell does not follow the cross-sectional that is used for the calculation of plateau stress in adsorbent structures. Then tow equations are extracted to calculate the effective cross-sectional area and the transfer force. Applying sequential quadratic programming method (SQP) and genetic algorithm (GA), to design a graded metal foam with high specific Energy absorption. Manuscript profile
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  2 - Introducing a Model for Road headers' Performance Prediction Based on the Specific Energy and the Angle between Tunnel Axis and the Planes of Weakness
  Arash Ebrahimabadi
  Road headers offer a unique capability and flexibility for the excavation of soft to medium strength rockformations, hence; are extensively used in underground mining and tunneling operations. A critical issue insuccessful road header application is the ability to evalu More

  Road headers offer a unique capability and flexibility for the excavation of soft to medium strength rockformations, hence; are extensively used in underground mining and tunneling operations. A critical issue insuccessful road header application is the ability to evaluate and predict the machine performance. The mainobjective of this research study is to investigate the cutting performance of road headers in coal measure rocksby paying special attention to the influence of discontinuity orientation (alpha angle) and the specific energy.With this respect, a database was established from detailed field data including the measured instantaneouscutting rates (ICR) and geomechanical parameters of the coal measure rocks for each cutting condition throughthe tunnels in Tabas coal mine project. The database was then analyzed by utilizing the statistical method inorder to yield new predictive models. The influence of alpha angle (the angle between tunnel axis and the planesof weakness) on road header performance was investigated and the correlation between them was found to begood (R²=0.96). The analysis of the specific energy also showed that there is a relatively good relation (R²=0.91)between this parameter and ICR. Finally, the new predictive models for ICR (with respect to alpha angle andspecific energy) showed to have highly correlated relationships within the limits of measured values and hencemay successfully be used to evaluate the performance of medium-duty road headers in coal measure rocks. Manuscript profile
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  3 - Investigation of energy absorption in shock absorbers of grooved circular using response surface
  شیما شهروی محمد جواد رضوانی علی جهان
  The main objective of this research is improving the design and performance of the polyurethane foam-filled thin-walled aluminum grooved circular tubes. The tubes are shaped with the inner and the outer circular grooves at different positions along the axis. In this stu More

  The main objective of this research is improving the design and performance of the polyurethane foam-filled thin-walled aluminum grooved circular tubes. The tubes are shaped with the inner and the outer circular grooves at different positions along the axis. In this study, the effects of the grooves distance, tube diameter, grooves depth, foam density, and tube thickness are investigated on the Specific Energy Absorption (SEA) of grooved circular tubes. finite-element analysis (FEA) and response surface methodology (RSM) is carried out for crush force efficiency. Finite-element analysis is performed with design of experiments technique (DOE) at the different combinations of the design parameters. The results of RSM indicate that SEA is related to the grooves distance, tube diameter, tube thickness of the groove and groove depth, by a quadratic model. Moreover, the effects of the interaction between the grooves distance - the foam density and the grooves distance - the tube diameter on the SEA was significant. Manuscript profile
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  4 - Numerical simulation of energy absorbing bumpers two cylindrical tube filled with polyurethane foam
  mohammadreza RezaeiAbadeh Mohammad Javad Rezvani
  The purpose of this article, in order to determine the impact of this type of attraction is thin-walled tubes as energy absorbing system. The twin-tube models after applying a force inside each sink. So, in order to achieve this goal and pipes of different diameters of More

  The purpose of this article, in order to determine the impact of this type of attraction is thin-walled tubes as energy absorbing system. The twin-tube models after applying a force inside each sink. So, in order to achieve this goal and pipes of different diameters of pipe rings and simple tube, The thickness of the ring pipes and tubes, all with the impact of foam on bumpers are considered on cylindrical tube. Therefore, using numerical simulations by Abaqus software to evaluate the impact parameters, including Specific Energy Absorption (SEA) and Crush Force Efficiency (CFE) as discussed testing purposes. The energy absorbing system can be used in the aerospace industry, shipbuilding, automotive, railway industry and elevators used to absorb impact energy. Finally, appropriate geometric parameters and the best examples of criteria considered with respect to the objectives, are introduced Manuscript profile
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  5 - Numerical investigation of energy absorption semi apical angel in conical grooved tubes under dynamic axial load and comparing quasi-static and dynamic loading
  Nima Asadi Dehmirahmadi Mohammad Javad Rezvani
  The purpose of this article is to determine energy absorbing of empty conical tubes. In these innovated models, there are a handful of rectangular grooves around the inner and outer surface of the tube. In this study, effects of number of grooves and their semi apical a More

  The purpose of this article is to determine energy absorbing of empty conical tubes. In these innovated models, there are a handful of rectangular grooves around the inner and outer surface of the tube. In this study, effects of number of grooves and their semi apical angel on Energy Absorption, Specific Energy Absorption (SEA), maximum crush load and Crush Force Efficiency (CFE) are considered. The energy absorbing system can be used in the aerospace industry, shipbuilding, automotive, railway industry and elevators used to absorb impact energy. Finally, appropriate geometric parameters and the best examples of criteria considered with respect to the objectives, are introduced. Manuscript profile
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  6 - Numerical investigation of energy absorption of conical grooved tubes under dynamic axial load
  Nima Asadi Dehmirahmadi محمدجواد رضوانی
  In this study, Numerical investigation of energy absorption of conical grooved tubes under dynamic axial load by LS DYNA was considered. In order to achieve axisymmetric collapse mode inner and outer grooves were created around the surface of conical tubes. The purpose More

  In this study, Numerical investigation of energy absorption of conical grooved tubes under dynamic axial load by LS DYNA was considered. In order to achieve axisymmetric collapse mode inner and outer grooves were created around the surface of conical tubes. The purpose of this study was consideration of the effects of number of grooves and grooves deeps on energy absorption and crush force efficiency. The results indicate that with the increase in number of grooves the collapse modes would not change. In addition to this, with the increase in number of grooves maximum crush load and collapse modes decrease but the force-displacement curves would be smoother Manuscript profile
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  7 - Multi-response Optimization of Grooved Circular Tubes Filled with Polyurethane Foam as Energy Absorber
  Shima Shahravi Mohammad Javad Rezvani Ali Jahan
  10.22094/joie.2018.764.1487
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  8 - بررسی اثر آغازگر کمانشی در جذب انرژی لوله‌های جدار نازک استوانه‌ای با استفاده از شبیه‌سازی عددی
  فائزه عبدالهی محمد جواد رضوانی
  لوله‌های استوانه‌ای جدار نازک به عنوان جاذب انرژی ضربه بواسطه ساخت و نصب آسان و ظرفیت جذب انرژی بالا در صنایع خودرو سازی استفاده می‌شوند. با این حال، ضعف اصلی لوله‌های استوانه‌ای در نیروی پیک اولیه بالا می‌باشد. لذا، در این مقاله، برای غلبه بر این ضعف از یک آغازگر کمانش More

  لوله‌های استوانه‌ای جدار نازک به عنوان جاذب انرژی ضربه بواسطه ساخت و نصب آسان و ظرفیت جذب انرژی بالا در صنایع خودرو سازی استفاده می‌شوند. با این حال، ضعف اصلی لوله‌های استوانه‌ای در نیروی پیک اولیه بالا می‌باشد. لذا، در این مقاله، برای غلبه بر این ضعف از یک آغازگر کمانشی در ابتدای لوله استفاده شده است. این آغازگر کمانشی شامل یک میله فولادی است که توسط نوارهای کششی در ابتدای لوله استوانه‌ای نصب شده است. در این مطالعه، پارامترهای مربوط به آغازگر از جمله ارتفاع پیش ضربه آغازگر، تعداد نوارهای کششی، زاویه قرارگیری نوارها بر روی بدنه لوله‌های استوانه‌ای بررسی می‌شوند. بدین منظور شبیه سازی شبه استاتیک برای تعیین نیروی ماکزیمم لهیدگی، راندمان نیروی لهیدگی و جذب انرژی ویژه با استفاده از نرم افزار Ls-Dyna انجام گردید. برای بررسی صحت شبیه‌سازی عددی، نتایج آن با تست تجربی مقایسه شده است. نتایج نشان می‌دهند که مشخصات ضربه‌پذیری و عملکرد لوله‌های استوانه‌ای با وجود آغازگرهای کمانشی به طور قابل ملاحظه‌ای بهبود می‌یابد.   Manuscript profile
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  9 - Comparison of energy input, output and global warming potential of rapeseed and rainfed barely in Golestan province (Aqqala)
  M.T Feyzbakhsh عفت Parvar
  Comparing the energy of agricultural plants is one of the methods that can be used in prioritizing the cultivation of different agricultural plants in each region. In order to compare the energy input, output and global warming potential of rapeseed and rainfed barley f More

  Comparing the energy of agricultural plants is one of the methods that can be used in prioritizing the cultivation of different agricultural plants in each region. In order to compare the energy input, output and global warming potential of rapeseed and rainfed barley fields in Golestan province (Aqqla city), an experiment was conducted in the fall of 2019. For this purpose, through interviews with different farmers (37 and 21 farmers for rainfed barley and rainfed rapeseed, respectively, by filling out questionnaires in Aqqala city) to collect the required data of machines and consumables including Seeds, fertilizers, fuel and pesticides were used in two crops. After that, the required data were calculated in three sections: fuel consumption, fuel consumption and global warming potential due to the emission of greenhouse gases based on CO2. The highest percentage of direct input energy in rapeseed and rainfed barley fields was related to fuel consumption with 39.3 and 46.8 percent, respectively. The highest and lowest global warming potential was obtained from rapeseed and rainfed barley fields (1492 and 1.739 kg CO2 per hec, respectively). Also, in both products, the lowest amount of greenhouse gas production related to potassium fertilizer was 26.3 kg CO2 equivalent for rainfed rapeseed and 1.13 for rainfed barley. In both products, fuel consumption and fertilizer constitute the highest energy consumption and greenhouse gas production. The use of tools that reduce fuel consumption is recommended, and the necessity of investigating and researching rotation crops and using plants capable of fixing nitrogen is revealed. Manuscript profile