Relevant bibliographies by topics / Drawbar strength

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Drawbar strength'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Drawbar strength"

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Schreiber, M., and H. D. Kutzbach. "Influence of soil and tire parameters on traction." Research in Agricultural Engineering 54, No. 2 (June 24, 2008): 43–49. http://dx.doi.org/10.17221/3105-rae.

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The drawbar pull, travel reduction (slip), and rolling resistance are the main criteria to describe the traction behaviour of off road vehicles. Besides the engine performance, the drawbar pull is influenced by the traction conditions such as soil and the tire parameters. These traction conditions have to be described by a limited number of parameters which can be easily determined. Empirical equations were used to analyse roughly 850 traction curves measured and published by Steinkampf. As a result, the important parameters to describe the traction conditions are three tire parameters (radius, width, inflation pressure) and five soil parameters (soil cover, upper soil strength, lower soil strength, clay content, moisture content). These parameters with relative values between 0 and 100% are used to establish the equations for the traction prediction. Main steps to achieve this goal are the extension of the traction slip equation by a linear term of slip, and the description of this curve by 4 meaningful characteristic coefficients: the x- and y-coordinates of the &kappa;-maximum (&sigma;<sub> &kappa;max</sub>, &kappa;<sub>max</sub>), the y-axis intercept &rho;<sub>e</sub>, and the gradient of &kappa; at zero slip (&kappa;’(0)).
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Wang, Bin Jie, Qiang Li, and Zhi Ming Liu. "Research on the Stress Fatigue Assessment about the Hot Spot Stress on the Bogie Frame." Advanced Materials Research 328-330 (September 2011): 1281–86. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.1281.

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As the loading conditions for the railway vehicles are becoming more and more complex, nominal stress has been unable to fully satisfy the requirements for assessing fatigue strength for weld structures. Hot spots stress is much more closer to the actual stress of a weld structure, it can suit the demand of high speed trains’ fatigue evaluation better. In this paper, on the basis of UIC615-4 standard, the nominal stress of the welded bogie frame was calculated and its fatigue strength was assessed using FEA method. Also, set the joint section between drawbar seat and the transom bottom flange as the object of the study, succeeded in evaluating the hot spot stress of the welded bogie frame. Compared the hot spot stress calculation result with the nominal stress from shell elements, the result shows that hot spot stress is higher than the nominal stress. Using the hot spot stress to assess fatigue has the higher reliability
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Costantini, A., M. Podberscek, and MR Nester. "Site preparation for Pinus establishment in south-eastern Queensland. 2. Effect of cultivation and cultivation width on growth." Australian Journal of Experimental Agriculture 35, no. 8 (1995): 1159. http://dx.doi.org/10.1071/ea9951159.

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The standard site preparation practice used for Pinus plantation establishment on well-drained soils in south-eastern Queensland is blade (subsurface, wing rip) cultivation to a width of 2.0 m and a depth of 0.2 m. This operation requires high drawbar power and is difficult to achieve in high strength soils, or in soils where roots and stumps hinder progress of the blade through the soil. The aim of the study reported in this paper was to better define cultivation growth relationships for Pinus caribaea var. hondurensis plantations in order to determine if site preparation objectives could be achieved with a reduced cultivation effort. A highly significant 'soil type x cultivation' interaction was observed. In contrast to the growth responses observed on hardsetting soils, cultivation did not improve growth on non-hardsetting soils. There is an opportunity therefore to reduce reforestation site preparation costs by only cultivating soils that show a growth response. The cultivation response on hardsetting soils has increased throughout the study period, and is attributed to a reduction in soil penetration resistance. The response however shows diminishing gains with increasing cultivation widths. Blade cultivation widths of 1.2 m were found to capture 97% of the gains that could be expected from widths of 2.0 m. A significant 'family x soil penetration resistance' interaction was observed. An opportunity to increase plantation productivity by targeting better performing families to hardsetting soils is suggested.
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Gil, Imanol, Joseba Mendiguren, Lander Galdos, Endika Mugarra, and Eneko Saenz de Argandoña. "New drawbead tester and numerical analysis of drawbead closure force." International Journal of Advanced Manufacturing Technology 116, no. 5-6 (July 5, 2021): 1855–69. http://dx.doi.org/10.1007/s00170-021-07472-x.

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AbstractCurrently, a great deal of controversy exists regarding the real forces generated in drawbeads during sheet metal forming processes. The present work focuses on the analysis of the uplift force. First, a detailed literature review is carried out to analyse previous experimental procedures used to measure uplift forces. It is found that previous setups do not perfectly replicate the real geometry of industrial drawbeads. In order to obtain reliable forces, an experimental drawbead tester capable of adequately replicating industrial drawbeads is developed. Later, a variety of steels ranging from mild steels to 3rd-generation ultra-high-strength steels are tested and reliable uplift and also restraining force values are obtained. The main purpose of the work is to share with the research community reliable experimental data that allows precise evaluation of the accuracy of current drawbead models and that supports the generation of new numerical and equivalent drawbead models. In parallel to the experimental procedure, a step forward in the understanding of the drawbead closing phenomena is also achieved through a 2D numerical model. The main purpose of the model is to identify the variables that greatly affect uplift force. Going beyond previous studies, in which some variables were analysed, the present work covers, in a holistic manner, the impact that material properties, the geometry of drawbeads and contact behaviour between sheet and drawbead have on the uplift force. It is determined that surprisingly minor geometrical deviations in the drawbead nominal geometry have a large impact on the uplift force.
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FUKIHARU, Hiroshi, Kazuki ISHIKAWA, and Motoyuki YOSHIDA. "Approximate Calculation of Drawbead Force for High-Strength Steeland Verification Experiment." Journal of the Japan Society for Technology of Plasticity 52, no. 610 (2011): 1203–7. http://dx.doi.org/10.9773/sosei.52.1203.

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YAMAMOTO, Noritaka, and Masahiro NEGISHI. "Relationship between the Anterior Drawer Displacement of Tibia and Muscle Strength." Proceedings of the JSME annual meeting 2002.1 (2002): 139–40. http://dx.doi.org/10.1299/jsmemecjo.2002.1.0_139.

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Sirivedin, K., K. Krueger, V. Thoms, Dietmar Suesse, Roland Mueller, and M. Schatz. "Investigation of the Strain Hardening and Bauschinger Effect of Low and High Strength Steel Application in Drawbead-Tester by Experiment and Numerical Simulation." Advanced Materials Research 55-57 (August 2008): 761–64. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.761.

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The research is aimed to investigate Bauschinger effect and strain hardening by the application of drawbead-tester. Generally, the drawbead is used to control the material flow into the die cavity in sheet metal forming process. When the material is flowing into the drawbead, it may cause the development of strain hardening and/or Bauschinger effect. This work consists of two main equipment particularly developed for the experiments. They are drawbead-tester and three-point bending device. The drawbead-tester provides the possibility to integrate the optical in-process strain analysis system. Whereas the sheet metal was being formed in the drawbead, the local strain of the sheet metal was evaluated. At the same time, the drawbead restraining and holding forces were measured. The three point bending device and numerical simulation method are used to investigate the Bauschinger effect. In the experiment, the cyclic bending forces were measured and compared with the result obtained by numerical simulation.
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YAMAMOTO, Noritaka, and Koji YAMAMOTO. "Effects of Training on the Anterior Drawer Displacement of Tibia and Muscle Strength." Proceedings of Conference of Tokai Branch 2003.52 (2003): 161–62. http://dx.doi.org/10.1299/jsmetokai.2003.52.161.

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Bernhardt, Ida Stange, Helene Nissen-Lie, Christian Moltu, John McLeod, and Marit Råbu. "“It’s both a strength and a drawback.” How therapists’ personal qualities are experienced in their professional work." Psychotherapy Research 29, no. 7 (June 27, 2018): 959–70. http://dx.doi.org/10.1080/10503307.2018.1490972.

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Jiao, Zhi Jie, Jian Ping Li, and Jie Sun. "A Pilot Rolling Mill Designed for High Strength Steels." Materials Science Forum 654-656 (June 2010): 210–13. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.210.

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High strength steels, such as austenitic stainless steel, Transformation Induced Plasticity (TRIP) steel and silicon steel, have significant work hardening during cold rolling, which in turn induces a quickly increased rolling force. Tension plays a very important role in the reduction of the rolling force. However, coiler tension control system used in the classic experimental rolling mill requires long-scale strip, which cannot be satisfied for most experimental cases. To overcome this drawback, a new pilot rolling mill has been developed. The horizontally located hydraulic cylinders and clamps have been used to apply tension to the rolled short-scale strip. With this rolling mill, the austenitic stainless steel strip, TRIP steel strip and other high strength strips have been studied.
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Dissertations / Theses on the topic "Drawbar strength"

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Kopečný, Aleš. "Vliv pneumatik na výstupní parametry traktorů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231708.

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The thesis summarizes the results of the measurement of the output parameters of the tractor, on which were mounted three different types of tires. The measured parameters are the maximum pulling power, slippage, specific effective fuel consumption at the maximum pulling performance. The final measured and calculated results are presented in tables and graphs. The results of the measurements were processed by the use of regressive analysis.
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Howard, Meredith E. "The Joy of CEX: Sharpening the (t,3He) probe at 345 MeV for the charge-exchange knife drawer." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1222168015.

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Barros, João Ricardo Pleno Rascão de. "Análise experimental do ensaio de atrito com freio." Master's thesis, 2017. http://hdl.handle.net/10316/83344.

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Dissertação de Mestrado Integrado em Engenharia Mecânica apresentada à Faculdade de Ciências e Tecnologia
Os aços convencionais têm vindo a ser substituídos pelos de alta resistência na produção de componentes em chapa, em particular na indústria automóvel, devido à excelente relação entre resistência e peso. De facto, a elevada resistência específica permite garantir os requisitos de segurança e de redução de peso, i.e. redução de consumo. Contudo, os aços de alta resistência apresentam uma formabilidade imprevisível com base na curva limite de estampagem, retorno elástico elevado e suscetibilidade a danos de superfície como gripagem, uma vez que a deformação plástica envolve pressões de contacto mais elevadas do que as exigidas pelos aços convencionais.De modo a compreender os mecanismos de contacto que ocorrem durante a estampagem foram propostos diferentes ensaios tribológicos, dos quais se destaca o ensaio de atrito com freio, uma vez que permite a avaliação do coeficiente de atrito e a reprodução de condições com inversão da trajetória de deformação. O objetivo principal deste trabalho é explorar a potencialidade do ensaio de atrito com freio para estudar o comportamento mecânico e tribológico dos aços de alta resistência, incluindo a geração de calor por deformação plástica e/ou atrito. O equipamento utilizado foi projetado no âmbito do projeto PTDC/EME-TME/74152/2006, de modo a possibilitar a realização dos ensaios com recurso a uma máquina de ensaios de tração. O presente trabalho envolveu a elaboração de um guia para o procedimento experimental, de modo a garantir a reprodutibilidade dos ensaios, que inclui a definição dos métodos a utilizar na aquisição do campo de temperatura, bem como no tratamento e análise dos resultados. Os resultados analisados incluem a evolução com o tempo da força do punção e da amarra e da temperatura da chapa, o perfil após retorno elástico, a pressão de contacto e a análise dos perfis de rugosidade da superfície da chapa.Os resultados mostram que o ensaio de atrito com freio permite evidenciar as variações de temperatura associadas ao processo de conformação, em particular para velocidades de escorregamento e pressões contacto elevadas. No entanto, o efeito da velocidade de escorregamento está associado aos fenómenos de transmissão de calor, o que requer uma melhor compreensão acerca dos parâmetros que influenciam estes fenómenos. O facto de o ensaio reproduzir condições de flexão-deflexão, típicas dos processos de conformação, pode constituir uma ponte interessante para a melhoria dos modelos de comportamento mecânico e de contacto com atrito utilizados atualmente na simulação numérica do processo.
Conventional steels have been replaced by Advanced High Strength Steels (AHSS) in the production of sheet components, particularly in the automotive industry, due to their excellent weight to strength ratio. In fact, the high specific strength guarantees the safety and weight reduction requirements, leading to consumption reduction. However, AHSS show unpredictable formability based on the forming limit curve, high yield strength and are susceptibility to surface damage like adhesion, since their plastic deformation involves higher contact pressures than those required by conventional steels.In order to understand the contact mechanisms that occur during sheet metal forming, different tribological tests were proposed, of which the drawbead test stands out, since it allows the evaluation of the coefficient of friction and the reproduction of forming conditions with inversion of the strain path.The main objective of this work is to explore the potential of the drawbead friction test to evaluate the mechanical and tribological behavior of AHSS, including the heat generated by plastic deformation and/or friction. The equipment used was designed as part of the PTDC/EME-TME/74152/2006 project, in order to enable the tests to be performed in a tensile test machine. The present work involved the elaboration of a guide for the experimental procedure, in order to guarantee the test reproducibility, which includes the definition of the methods to be used for acquiring the temperature field, as well as for the treatment and analysis of the results. The analyzed results include the evolution with time of the punch and grip load and the specimen’s temperature. The specimen’s profile after springback as well as the sheet surface contact pressure and roughness profiles, were also studied.The results show that the drawbead test allows measuring the temperature variations associated with the forming process, in particular for high sliding speeds and contact pressures. However, the sliding velocity effect is associated with heat transfer phenomena, which requires a better understanding of the parameters which influence these phenomena. The fact that the test reproduces bending-unbending conditions, typical of stamping processes, can be an interesting bridge for the improvement of the mechanical behavior and friction contact models currently used in the numerical simulation of these processes.
Outro - P2020-PTDC/EMS-TEC/6400/2014
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Book chapters on the topic "Drawbar strength"

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Jayalakshmi, S., and R. Arvind Singh. "Processing Routes, Mechanical, and Tribological Properties of Light Metal Matrix Nanocomposites." In Materials Science and Engineering, 991–1037. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1798-6.ch040.

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The chapter highlights the various processing/synthesizing routes of Light Metal Matrix Nanocomposites (LMMNCs), their microstructural characteristics, mechanical behaviour, and tribological properties. LMMNCs are advanced materials, in which nano-sized ceramic particles are reinforced into Al/Mg matrices. In conventional Metal Matrix Composites (MMCs), the incorporation of micron sized reinforcements in the matrix usually results in a considerable improvement in hardness and ultimate strength when compared to the unreinforced base material. However, most of these composites do not show plastic deformation (little or no yield) and exhibit drastic reduction in ductility. This poses a major limitation for MMCs to be used in real-time applications. In order to overcome this drawback, Al/Mg composites with nano-scale reinforcements have been developed. Based on numerous research works, it has been established that LMMNCs are better materials that possess superior properties, wherein both strength and ductility improvements along with excellent wear resistance can be achieved.
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Jayalakshmi, S., and R. Arvind Singh. "Processing Routes, Mechanical, and Tribological Properties of Light Metal Matrix Nanocomposites." In Processing Techniques and Tribological Behavior of Composite Materials, 1–46. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-7530-8.ch001.

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The chapter highlights the various processing/synthesizing routes of Light Metal Matrix Nanocomposites (LMMNCs), their microstructural characteristics, mechanical behaviour, and tribological properties. LMMNCs are advanced materials, in which nano-sized ceramic particles are reinforced into Al/Mg matrices. In conventional Metal Matrix Composites (MMCs), the incorporation of micron sized reinforcements in the matrix usually results in a considerable improvement in hardness and ultimate strength when compared to the unreinforced base material. However, most of these composites do not show plastic deformation (little or no yield) and exhibit drastic reduction in ductility. This poses a major limitation for MMCs to be used in real-time applications. In order to overcome this drawback, Al/Mg composites with nano-scale reinforcements have been developed. Based on numerous research works, it has been established that LMMNCs are better materials that possess superior properties, wherein both strength and ductility improvements along with excellent wear resistance can be achieved.
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Rahim, Ku Nurhanim Ku Abdul, I. Elamvazuthi, P. Vasant, and T. Ganesan. "Robotic Assistive System." In Handbook of Research on Human-Computer Interfaces, Developments, and Applications, 444–77. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-5225-0435-1.ch018.

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Stroke is the leading cause of disability that influences the quality of people's daily life. As such, an effective method is required for post-stroke rehabilitation. Research has shown that a robot is a good rehabilitation alternative where conventional robotic assistive system is encoded program by the robot expertise. The major drawback of this approach is that the lack of voluntary movement of the patient may affect the proficiency of the recovery process. Ideally, the robotic assistive system should recognize the intended movement and assist the patient to perform and make the training exercises more effective for recovery process. The electromyography based robotics assistive technology would enable the stroke patients to control the robot movement, according to the user's own strength of natural movement. This chapter briefly discusses the establishment of mathematical models based on artificial intelligent techniques that maps the surface electromyography (sEMG) signals to estimated joint torque of elbow for robotic assistive system.
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Rahim, Ku Nurhanim Ku Abdul, I. Elamvazuthi, P. Vasant, and T. Ganesan. "Robotic Assistive System." In Robotic Systems, 1688–720. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1754-3.ch081.

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Stroke is the leading cause of disability that influences the quality of people's daily life. As such, an effective method is required for post-stroke rehabilitation. Research has shown that a robot is a good rehabilitation alternative where conventional robotic assistive system is encoded program by the robot expertise. The major drawback of this approach is that the lack of voluntary movement of the patient may affect the proficiency of the recovery process. Ideally, the robotic assistive system should recognize the intended movement and assist the patient to perform and make the training exercises more effective for recovery process. The electromyography based robotics assistive technology would enable the stroke patients to control the robot movement, according to the user's own strength of natural movement. This chapter briefly discusses the establishment of mathematical models based on artificial intelligent techniques that maps the surface electromyography (sEMG) signals to estimated joint torque of elbow for robotic assistive system.
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Conference papers on the topic "Drawbar strength"

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Gay, Jasmine, Carl Moore, Marquese Pollard, Tarik Dickens, and Hui Wang. "The Effect of Time Delay on 3D Printed Part Strength." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11790.

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Abstract We are investigating the impact on 3D printed part strength when the extruder is positioned using articulated robotic arms in place of a traditional x-y gantry-style system. One of our printer designs is called the DeXter printer [1] which uses two selective compliance assembly robotic arms (SCARA) to position dual extruders. An advantage of using dual robotic arms is that two extruders can move independently drastically reducing build times, or the second arm can perform additional operations like segment stimulation during the build process [2]. In either case the arms require a collision avoidance process to prevent them from colliding in the part space. A possible drawback of the collision avoidance requirement is that it can result in a time delay along some sections of the layer which, due to cooling, could have adverse effects on the part strength. This research aims to determine how this cooling time will affect the strength of ABS extruded parts. We performed tensile tests on 3D printed part samples for which we altered the g-code to produce a variable time delay during the printing process. Our control sample had a zero-dwell time, and as we increased dwell time we found that the ultimate tensile strength (UTS) did decrease.
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Reyes, Marta C. T., Peter Kaleff, Antonio C. Fernandes, and Marcos D. A. S. Ferreira. "Conversions vs. Newbuildings: General Arrangement and Strength Issues in FPSO Design." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67364.

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The conversion of ageing tankers is a tempting alternative to newbuildings when FPSO units are planned. The low cost of an already classified hull and an existing pumping facility compensate for the repair and updating costs a conversion may demand. Newbuildings on the other hand allow for improved production plant and storage tank lay-out. The trade offs between conversions and newbuildings are analyzed from the point of view of strength and general arrangement. Converted tankers carry a serious strength drawback since the emptied engine space enhances the high buoyancy region at the stern which significantly increases bending moment amidships. In general one or more cargo tanks must be kept at partial loading to compensate for the increased bending moment. A new building lay-out is analyzed in which the tanker engine space is completely eliminated. Utility systems are resized and placed on the main deck aft of the production plant. Accommodation spaces are also resized and rearranged in order to fit into the reduced deck space available. The gains in strength are quantified and the lay-out implications are discussed in detail. A comparative study is presented between a conversion of a hypothetical tanker and an equivalent new building.
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Choi, Sung R., and John P. Gyekenyesi. "Power Law Versus Exponential Form of Slow Crack Growth of Advanced Structural Ceramics: Dynamic Fatigue." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30506.

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The life prediction analysis based on an exponential crack velocity formulation was examined using a variety of experimental data on glass and advanced structural ceramics in constant stress-rate (“dynamic fatigue”) and preload testing at ambient and elevated temperatures. The data fit to the strength versus ln (stress rate) relation was to found be very reasonable for most of the materials. It was also found that preloading technique was equally applicable for the case of slow crack growth (SCG) parameter n>30. The major limitation in the exponential crack velocity formulation, however, was that an inert strength of a material must be known priori to evaluate the important SCG parameter n, a significant drawback as compared to the conventional power-law crack velocity formulation.
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Liang, Fei, Jihua Gou, He Shen, Yunjun Xu, and Bob Mabbott. "Carbon Fiber Reinforced Shape Memory Nanocomposites Incorporated With Highly Conductive Carbon Nanopaper for Electro Actuation." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3188.

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Shape memory polymers (SMPs) are one of the most popular smart materials due to light weight and high elastic deformation capability. In this study, highly conductive carbon nanofibers paper (CNFP) was coated on the surface of SMP as a conductive layer for electro actuation of SMP. To overcome the drawback of low modulus and low strength of shape memory polymer (SMP), continuous carbon fiber reinforcement was also incorporated with SMP by autoclave processing. The dynamic mechanical analysis (DMA) result showed over 600% increase of storage modulus of SMP by introducing carbon fiber reinforcement. Also, the shape recovery time of SMP has been reduced over 150%, while the recovery ratio of SMP has been improved to 99% by incorporating with carbon fiber reinforcement. Additionally, the mechanical property degradation of SMP composites has been investigated after different electro actuation cycles. After 50 actuation cycles, the decrease of flexural modulus of SMP composites is negligible (< 2%), and the ultimate flexural strength of SMP composites only decreased 25%. The SMP composite shows high strength and modulus, and good durability.
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Kornegay, John, Daniel Depperschmidt, and Ajay K. Agrawal. "Passive Control of Thermo-Acoustic Instability in Different Length Combustors Using a High-Strength Metallic Porous Insert." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43890.

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Although lean premixed combustion (LPM) is very clean and basically soot-free, it has one serious drawback, i.e., tendency to develop thermo-acoustic instabilities. These instabilities can be very violent, at the least causing unwanted noise and vibration, and in more serious cases, complete engine failure. Current research has shown methods to address such instabilities using passive and active mitigation techniques. In this study, thermo-acoustic instabilities in a swirl-stabilized LPM combustion system are mitigated using a high-strength metallic porous insert fabricated by a 3D additive manufacturing technique. Although the technique has been demonstrated in our previous studies, the present focus is to utilize a given porous insert geometry to mitigate thermo-acoustic instabilities in different length combustion chambers producing different resonant frequencies, to overcome the typical limitation of passive techniques. For each combustor length, experiments are conducted over a range of equivalence ratios and reactant flow rates. In all cases, porous insert was effective in significantly reducing the sound pressure level (SPL) at the frequency of the instability, with reductions of 20 dB and higher. Time-resolved particle image velocimetry (PIV) measurements are acquired to describe flow and turbulence fields in the combustor without and with porous insert. Proper orthogonal decomposition (POD) analysis is used to quantify the energy content of turbulent modes, and harmonic reconstruction is performed to illustrate the dramatic changes in the oscillatory flow field when the porous insert is used. The ability of the porous insert to adjust to different geometric and operating conditions of the combustor is a unique capability, inherent to its fundamental operating principle.
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Zheng, Zhuoyuan, Yanwen Xu, Bo Chen, and Pingfeng Wang. "Gaussian Process Based Crack Initiation Modeling for Design of Battery Anode Materials." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97547.

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Abstract Silicon-based anode is one of the promising candidates for the next generation lithium ion batteries (LIBs) to achieve high power/energy density. However, the major drawback limiting the practical application of Si anode is that Si experiences significant volume change during its lithiation/de-lithiation cycles, which induces high stress and causes degradation and pulverization of the anode. This study focuses on the crack initiation performances of Si anode during the de-lithiation process. A multi-physics based finite element (FE) model is built to simulate the electrochemical process and crack generation during de-lithiation. On top of that, a Gaussian Processes (GP) based surrogate model is developed to assist the exploration of the crack initiation performances within the anode design space. It is found that, the thickness of the Si coating layer TSi, the yield strength σFc of Si material, the cohesive strength between Si and substrate σFs, and the curvature of the substrate ρ have large impacts on the cracking behavior of Si. This coupled FE simulation-GP surrogate model framework is also applicable to other types of LIB electrodes.
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Veljkovic, Ana, Valter Carvelli, Sandor Solyom, György L. Balázs, and Mohammadali Rezazadeh. "Modelling the temperature effects at the interface between GFRP bar and concrete." In IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.1065.

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<p>GFRP (Glass Fibre Reinforced Polymer) reinforcing bars find recently increasing application in RC (Reinforced Concrete) structures. In addition to the main advantages, such as non-corrosive nature and high strength-to-weight ratio, the main drawback is their endurance under high temperature. Mechanical properties of GFRP bars and their bond to concrete decrease significantly when exposed to elevated temperatures. Thus, thermal response represents one of the main safety concerns for GFRP RC structures. This study focuses on the numerical modelling of the thermo-mechanical behaviour of GFRP bar and concrete bond. The temperature dependent bond law was calibrated using the experimental pull-out tests, and subsequently it was implemented in the finite element simulations. The validation of the methodology is obtained by comparison of corresponding experimental and numerical results.</p>
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Gribniak, Viktor, Aleksandr K. Arnautov, and Arvydas Rimkus. "Development of an anchorage prototype for CFRP stress-ribbon systems using 3D printing technique." In The 13th international scientific conference “Modern Building Materials, Structures and Techniques”. Vilnius Gediminas Technical University, 2019. http://dx.doi.org/10.3846/mbmst.2019.138.

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Abstract:
Compared with other structure types, stress-ribbon systems are extremely simple though requiring massive anchorage blocks because of very large tensile stresses induced in the ribbons. Such structural systems are efficient in pedestrian bridges. A major drawback of these systems is related to corrosion of the steel ribbons. Unidirectional carbon fibre reinforced polymer (CFRP) has a high potential for replacing steel in the ribbons because of lightweight, high strength, and excellent resistance to corrosion and fatigue. Application of CFRP materials, however, faced serious problems due to construction of the anchorage joints. Thus, the anchorage system is the object of this research. Adhesive bonding is a simplest technology for joining structural components made of CFRP composites with polymer matrix. In the adhesion joints, the loads are transferred due to the shear effect. However, a relatively low inter-laminar shear strength of CFRP decreases effectiveness of the gripping systems. Brittle failure of the bond is often consequence of stress concentration. An innovative anchorage joint is proposed to control shear stresses by varying a local curvature of the contact surface. A natural shape of Nautilus shell was chosen for the gripping system, whereas a 3D printing technique was applied for the prototyping purpose. Mechanical behaviour of the anchorage prototypes made of printed polymeric material was investigated experimentally.
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Huang, Shujuan, Amit Gupta, and Diana-Andra Borca-Tasciuc. "Sources of Experimental Errors in Specific Absorption Rate Measurement of Magnetic Nanoparticles." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30796.

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Magnetic-nanoparticles cancer hyperthermia, a side effects-free, potential cancer therapy employing magnetic nanoparticle remotely heated by alternating magnetic field (AMF), is receiving considerable attention from researchers and physicians [1–3]. Specific absorption rate (SAR), which is used to quantify nanoparticles’ heat generation under the applied AMF, is defined as the thermal power per unit mass dissipated by the magnetic material [3]. SAR depends on field parameters (magnetic field strength and frequency) and material system (size and magnetic properties of nanoparticles). Accurate measurement of SAR is a critical step in enabling comparison with theoretical predictions for understanding other parameters that may affect the heat generation rate such as nanoparticle functionalization, clustering and immobilization in biological medium [4]. A main drawback is the fact that independent measurements on similar samples often provide significantly different SAR values. For example, the reported SAR of magnetite-based aqueous solution Endorem commercially available from Guerbet greatly differs among Ref. [3], [5] and [6], even when factors such as field intensity, H, and frequency, f, are taken into account.
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Ho, Y. K., G. J. Walker, and P. Stow. "Boundary Layer and Navier-Stokes Analysis of a NASA Controlled-Diffusion Compressor Blade." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-236.

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Performance calculations for a NASA controlled-diffusion compressor blade have been carried out with a coupled inviscid-boundary layer code and a time-marching Navier-Stokes solver. Comparisons with experimental test data highlight and explain the strengths and limitations of both these computational methods. The boundary layer code gives good results at and near design conditions. Loss predictions however deteriorated at off-design incidences. This is mainly due to a problem with leading edge laminar separation bubble modelling; coupled with an inability of the calculations to grow the turbulent boundary layer at a correct rate in a strong adverse pressure gradient. Navier-Stokes loss predictions on the other hand are creditable throughout the whole incidence range, except at extreme positive incidence where turbulence modeling problems similar to those of the coupled boundary layer code are observed. The main drawback for the Navier-Stokes code is the slow rate of convergence for these low Mach number cases. Plans are currently under review to address this problem. Both codes give excellent predictions of the blade surface pressure distributions for all the cases considered.
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