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Articoli di riviste sul tema "T6I6"
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Sainis, Salil, Aakarshit Kalra, G. Dinesh Babu e M. Nageswara Rao. "Weibull Analysis of the Effect of Interrupted Aging Treatments on the Fatigue Life of Components Made of Cast Aluminium Alloy 354". Advanced Materials Research 849 (novembre 2013): 223–27. http://dx.doi.org/10.4028/www.scientific.net/amr.849.223.
Testo completoAbstract (sommario):
Cast aluminum alloy 354 is widely used in the automobile industry due to its attractive set of mechanical properties and excellent castability. The compressor wheel in turbochargers, for example, is used for the production of this alloy. Apart from mechanical properties like fracture toughness and tensile strength, the fatigue life of the component is also a critical issue while considering the performance. This study makes an attempt to improve the fatigue life of a component made out of this alloy by subjecting it to interrupted aging cycles similar to T6I4 and T6I6 (discussed in the published literature) instead of the normally used T61 standard aging treatment. Results show that subjecting the material to these interrupted aging treatments gives lower fatigue life than that obtained after subjecting it to standard T61 conditions.Also, T6I4 treatment yields better fatigue life as compared to T6I6.
2
Risanti, D. D., e Sybrand van der Zwaag. "Effect of Low Temperature Aging on Internal Friction of AA2024". Advanced Materials Research 463-464 (febbraio 2012): 41–46. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.41.
Testo completoAbstract (sommario):
The anelastic behavior of AA2024 alloy is studied in the temperature range between room temperature and 325 °C. The internal friction technique is shown to be very sensitive to the microstructural changes that take place at these temperatures. Interrupted aging performed at low temperature induces increase in the peak height at ~230 °C indicating the slow release of vacancies aiding the aggregation of Mg and Cu which further transforms into semicoherent precipitates. Stretched specimens indicate increase in background which is attributed to anelastic or viscoelastic of dislocations. TDIF of T6I4 samples is strongly affected to the point of deformation, whilst TDIF of T6I6 samples is affected by the deformation but irrespective to the point of deformation.
3
Babu, G. Dinesh, e M. Nageswara Rao. "Effect of Non-Conventional Aging Treatments on the Tensile Properties of Non-Hipped Castings of Aluminum Alloy 354". Advanced Materials Research 875-877 (febbraio 2014): 1397–405. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.1397.
Testo completoAbstract (sommario):
Cast aluminum alloy 354 is used extensively for production of critical automobile components, owing to its excellent castability and attractive combination of mechanical properties after heat-treatment. With the advent of higher performance engines, there has been a steady demand to further improve the mechanical behavior of the castings made of the alloy, among others, through improvements in processing. The present study explores the possibility of improving tensile properties of the alloy by adopting certain non-conventional aging treatments. The non-conventional treatments include aging cycles similar to T6I4 and T6I6 referred to in the published literature, artificial aging in two steps instead of in single step and artificial aging preceded by various natural aging times. The results show that none of these non-conventional treatments leads to improvement of all tensile properties compared to the standard T61 treatment. Significant hardening takes place in the alloy due to natural aging. Changing the time of natural aging preceding artificial aging was found to have little effect on tensile properties.
4
Babu, G. Dinesh, e M. Nageswara Rao. "Effect of Non-Conventional Aging Treatments on the Tensile Properties and Quality Indices of Hipped Components Made of Cast Aluminum Alloy 354". Advanced Materials Research 875-877 (febbraio 2014): 1429–36. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.1429.
Testo completoAbstract (sommario):
Cast aluminum alloy 354 is used extensively for production of critical automobile component, owing to its excellent castability and attractive combination of mechanical properties. With the advent of higher performance engines, there has been a steady demand to further improve the mechanical behavior of the alloy, among others, through improvements in processing. The present study explores the possibility of improving mechanical behavior and quality levels of the alloy by adopting certain non-conventional aging treatments. Quality indices Q and QC have been used for quality rating. The non-conventional treatments include aging cycles similar to T6I4 and T6I6 referred to in the published literature, artificial aging in two steps instead of in single step and artificial aging preceded by various natural aging times. The results show that none of the non-conventional treatments leads to improvement of all tensile properties compared to the standard T61 treatment. However, some specific treatments could be identified which lead to a comparable combination of tensile properties and a shade higher quality level. Increasing the time of preceding natural aging does not help in improving the tensile properties after artificial aging.
5
Sibal, Prateek, G. Dinesh Babu e M. Nageswara Rao. "Use of Strain Energy Density W and Qo as Quality Indices for Rating the Quality of Cast Aluminium Alloy354 as a Function of Processing Parameters". Advanced Materials Research 704 (giugno 2013): 189–94. http://dx.doi.org/10.4028/www.scientific.net/amr.704.189.
Testo completoAbstract (sommario):
Cast aluminium alloy 354 has found widespread application in the automotive industry for its excellent mechanical properties and good castability. The stringent emission norms and demands for improved fuel economy have pushed automobile technology to new frontiers. This has led to efforts to reduce weight while maintaining higher vehicle performance. Cast aluminium alloy 354 is a material that performs with reasonable effectiveness in the high stress automobile environment. The present study looks at the use of strain energy density W and the quality index Qo to determine the effect of process parameters like aging temperature and modification on the quality of the alloy 354 and also to monitor the effect of interrupted heat treatments T6I4 and T6I6 on the quality of the material. The strain energy density W calculated for the interrupted heat treatments on alloy 354 show a broad inverse relation with yield strength Rp. An improvement in the yield strength and the strain energy density of the alloy is observed when the alloy is subjected to modification. At artificial aging temperatures lower than the artificial aging temperature adopted in standard aging treatment an improvement in the Qo and W quality of the alloy 354 have been observed.
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Kaczmarek, Ł., M. Steglinski, J. Sawicki, J. Swiniarski, D. Batory, K. Kyzioł, Ł. Kołodziejczyk, W. Szymanski, P. Zawadzki e D. Kottfer. "Optimization of the Heat Treatment and Tribological Properties of 2024 and 7075 Aluminium Alloys". Archives of Metallurgy and Materials 58, n. 2 (1 giugno 2013): 535–40. http://dx.doi.org/10.2478/amm-2013-0032.
Testo completoAbstract (sommario):
This paper describes two stages of optimization of the properties of 2024 and 7075 aluminium alloys, in particular their resistance to pitting by first T6, T6I6 or T6I4 treatment, and second increase its tribological properties by depositing by RF PACVD method a gradient coating of high adhesion to the substrate. Quantitative microstructural characteristics reveals that it is possible to increase hardness (up to 190HV for 7075 alloy) with relatively high yield strength (520 MPa) and high ultimate elongation (about 20%) by optimizing dispersion of precipitates using two-stage artificial aging process. Next to eliminate forming of thin Al2O3 layer with relatively poor adhesion to the aluminium substrate, gradient a-C: H/Ti layers synthesis hybrid plasma chemical RF PACVD reactor equipped with pulsed magnetron sputtering system was used. Using such configuration enables forming a thick and highly adherent diamond-like carbon layer on aluminium surface with low coefficient of friction (0.05), at a substrate temperature below 470K. Due to application of Ti magnetron cathode it was possible to improve the adhesion strength up to 30mN of diamond-like carbon layer to the covered substrate. Influence of deposition parameters on microhardness profile as well as adhesion and morphology were determined by nanotest and AFM, respectively.
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Lipa, Sebastian, Łukasz Kaczmarek, Mariusz Stegliński, Hanna Radziszewska, Karol Kyzioł e Daniel Kottfer. "Effect of core/shell precipitations on fatigue strength of 2024-T6I6 alloy". International Journal of Fatigue 127 (ottobre 2019): 165–74. http://dx.doi.org/10.1016/j.ijfatigue.2019.06.006.
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Radziszewska, Hanna, Lukas Kaczmarek e Zbigniew Gawroński. "Effect of Precipitation with Core-Shell Structure on Mechanical Properties of PN-EN 2024 T6I6 Alloy". Journal of Siberian Federal University. Chemistry 10, n. 1 (marzo 2017): 67–81. http://dx.doi.org/10.17516/1998-2836-0007.
Testo completo
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LI, Hai, Daozhao PAN, Zhixiu WANG e Ziqiao ZHENG. "INFLUENCE OF T6I6 TEMPER ON TENSILE AND INTERGRANULAR CORROSION PROPERTIES OF 6061 ALUMINUM ALLOY". ACTA METALLURGICA SINICA 46, n. 4 (21 aprile 2010): 494–99. http://dx.doi.org/10.3724/sp.j.1037.2010.00494.
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Arfuso, Francesca, Elisabetta Giudice, Simona Di Pietro, Giuseppe Piccione e Claudia Giannetto. "Modulation of Serum Protein Electrophoretic Pattern and Leukocyte Population in Horses Vaccinated against West Nile Virus". Animals 11, n. 2 (11 febbraio 2021): 477. http://dx.doi.org/10.3390/ani11020477.
Testo completoAbstract (sommario):
This study aimed to evaluate the hematological and serum protein electrophoretic profiles of horses after inactivated West Nile virus (WNV) vaccine administration. Blood samples were collected from 10 horses before (T0), after 24 h, 48 h, 72 h, 1 week, 2 weeks and 3 weeks (T1I, T2I, T3I, T4I, T5I and T6I) from the first WNV vaccine-dose administration, before the vaccine-booster (TPREII), and after 24 h, 48 h, 72 h, 1 week, 2 weeks and 3 weeks (T1I I, T2II, T3II, T4II, T5II, T6II) from the WNV vaccine-booster. There was a significant increase in lymphocytes and a decrease in neutrophils after both the first vaccine-dose and vaccine-booster administration compared to the baseline values (p < 0.01). Monocytes showed higher values after 72 h, 1 week and 2 weeks from the vaccine-booster (p < 0.01). Higher serum total protein values were found in horses after both the first vaccine-dose and booster administration (p < 0.05). α1-lobulins increased after the vaccine-booster with the highest levels measured at T4II (p < 0.05); α-2- and β-globulin fractions increased throughout the post-vaccine period compared to the baseline values (p < 0.05); and higher γ-globulin values were found before the vaccine-booster (TPREII) and after 24 h, 72 h and 3 weeks from the vaccine-booster (T1II, T3II and T6II). The findings allow us to conclude that the WNV vaccine used in the current study does not alter the overall hemogram picture of horses although it is associated with modulation of leukocyte populations and the serum protein electrophoretic pattern.
Tesi sul tema "T6I6"
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Buha, Joka School of Materials Science & engineering UNSW. "Interrupted ageing of Al-Mg-Si-Cu alloys". Awarded by:University of New South Wales. School of Materials Science and engineering, 2005. http://handle.unsw.edu.au/1959.4/20794.
Testo completoAbstract (sommario):
This thesis systematically investigates the effects of a recently developed modified ageing procedure of aluminium alloys, termed the T6I6 temper, on the microstructural development and mechanical properties of the Al ??? Mg ??? Si - Cu alloy 6061. For the T6I6 temper, a conventional single stage T6 temper is interrupted by an ageing period at a reduced temperature (65??C) to facilitate secondary precipitation, before resuming the final ageing at the temperature of the initial T6 treatment. The T6I6 temper was found to cause simultaneous increases in tensile properties, hardness, and toughness as compared with 6061 T6. Al ??? Mg ??? Si ??? Cu alloys are medium strength alloys widely used in the automotive industry and their further improvement is underpinned by stringent demands for weight reduction placed on the transportation industry in recent years. The potential for further improvement of the mechanical properties was found in the control of secondary precipitation that may take place even in some fully aged alloys when exposed to reduced temperatures. The overall improvement in the mechanical properties of 6061 T6I6 was attributed to the formation of finer and more densely dispersed precipitates in the final microstructure. The refinement of precipitates was facilitated by control of the precipitation processes and gradual evolution of the microstructure throughout each stage of the T6I6 treatment. The results indicated that the concentration and the chemical environment of the vacancies controlled the precipitation processes in this alloy. Findings also show that the proportion of the different precipitate phases present in the final microstructure, as well as the amount of the solute in these precipitates, can be controlled and modified utilizing secondary precipitation. A number of analytical techniques were used in this study. The evolution of the microstructure was studied using Transmission Electron Microscopy (TEM), High Resolution TEM (HRTEM) and Three Dimensional Atom Probe (3DAP). Vacancy-solute interactions were studied using Positron Annihilation Lifetime Spectroscopy (PALS) and 3DAP. The distribution of the solute was studied using 3DAP and Nuclear Magnetic Resonance (NMR). Differential Scanning Calorimetry (DSC) was used to identify precipitation reactions and to determine the stability of vacancy-associated aggregates.
2
Alateah, Souad Mohammed. "Transforming clinical mycobacteriology with modern molecular methodology". Thesis, University of St Andrews, 2018. http://hdl.handle.net/10023/15920.
Testo completoAbstract (sommario):
Whole genome sequencing (WGS) is an attractive approach for mycobacteria diagnosis and epidemiological studies. It provides the potential for a rapid method that produces detailed information and could theoretically be used as a routine tool in clinical settings. This thesis focuses on the benefits and challenges involved in transforming molecular approaches into practical clinical mycobacteriology in general, and in particular WGS, as well as examining how it might be implemented. We first set out to improve the quantification of viable mycobacteria cells in vitro and make the molecular bacterial load assay (MBLA) sensitive enough to use in future clinical trials that monitor treatment response. The results showed the assay is rapid and accurate in its detection and count of viable bacteria. WGS was tested with different types of mycobacteria species to address different epidemiological questions. WGS not only provides a higher resolution result than traditional epidemiological methods but it can rapidly identify an outbreak, thus simplifying the investigation and reducing the cost. WGS accurately identified the sources of TB recurrence and could therefore have a potential role in determining the endpoints for clinical trials. Rapid genotyping of species in this way has been demonstrated in our studies. In addition, WGS has the ability to, in most circumstances, predict TB drug resistance. This could also prove very beneficial from a clinical standpoint. We used different approaches in our studies; for example, single nucleotide polymorphism threshold methods and the creation of a putative outbreak reference genome, which can be used in future outbreak investigations. WGS is a cost-effective, high-resolution method with a short turnaround. This makes it potentially usable as a routine tool in clinical settings and reference laboratories. Future studies are needed to improve the mycobacterial genome sequencing procedure, analysis and bioinformatics in order to implement WGS in clinical practice.
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Townes, William Waverley VI. "a study of showing". Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/33347.
Testo completoAbstract (sommario):
The thoughtful expression of building components
provides a conceptual framework through which we
can come to an understanding of architecture.
Beyond the appreciation of individual elements
involved in an assembly, numerous opportunities
emerge to form architectural conditions and places.
An envelope that oscillates between transparency and
opaqueness introduces a modern conception of boundary.
The control of natural light can also contribute to a
compact space without compromising the desired
level of privacy that is expected from a house.Master of Architecture
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Jacumasso, Sheila Cristina. "CARACTERIZAÇÃO MICROESTRUTURAL DAS PARTÍCULAS DE SEGUNDA FASE DE UMA LIGA DE ALUMÍNIO AA7050 NAS CONDIÇÕES T7451, T6 E T6I4-65". UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2014. http://tede2.uepg.br/jspui/handle/prefix/1460.
Testo completoAbstract (sommario):
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Previous issue date: 2014-06-02Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The AA7050 class from the 7XXX series alloys based on Al-Zn-Mg-Cu are widely used in aerospace structures and fuselage components, when the same are subjected to high stress loading due to its high ratio mechanical strength to density, in addition, to its corrosion resistance. The increased resistance of these alloys is obtained by heat treatment that involves solution treatment and ageing followed precipitation of a fine and homogeneous phase from the own chemical composition. In this, the present study aimed to perform the of AA7050 aluminum alloy microstructural characterization with different ageing heat treatment from the T7451, T6 and T6I4-65 conditions. Thus, different characterization techniques from the Optical Microscopy (OM), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Extraction of second phase particles, X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM) were used. It was evaluated which condition results is higher precipitation hardening phases that are responsible for the increased resistance of the alloy. The most significant results were obtained by TEM where it was possible to determine the morphology of the GPII zones in needles form with approximate size of 30nm and 10nm for both T6 and T6I4-65 conditions, respectively. Moreover, the metastable η' phase was identified in platelets form in the T7451, T6 and T6I4-65 conditions with approximate size of 50nm, 20nm and 10nm, respectively. The surface roughness analyses obtained by AFM have revealed that the T6I4-65 condition has higher surface roughness (Ra=14,87nm) when compared to the T7451 (Ra=7,65nm) and T6 (Ra=8,35nm) conditions. Indicating in this case, a higher density of small particles homogeneously distributed in the T6I4-65 aluminum alloy matrix.
As ligas da série 7XXX, da classe AA7050, à base de Al-Zn-Mg-Cu, são muito utilizadas na indústria aeroespacial, em estruturas de fuselagem e componentes sob alta tensão de carregamento, devido à sua alta relação entre resistência mecânica e densidade, além de sua resistência à corrosão. O aumento da resistência destas ligas é obtido por tratamento térmico de solubilização e envelhecimento, através da precipitação de uma fase fina e homogênea, proveniente da própria composição química. Neste contexto, o presente trabalho teve como objetivo principal realizar a caracterização microestrutural de uma liga de alumínio AA7050, submetida a diferentes tratamentos térmicos de envelhecimento nas condições T7451, T6 e T6I4-65. Desse modo, fez-se o uso de diferentes técnicas de caracterização entre elas Microscopia Ótica (MO), Microscopia Eletrônica de Varredura (MEV), Microscopia de Força Atômica (AFM), Extração de Partículas de segunda fase, Difração de Raios X (DRX) e Microscopia Eletrônica de Transmissão. Consequentemente, avaliou-se qual condição apresenta maior precipitação de fases endurecedoras que são responsáveis pelo aumento de resistência da liga. Os resultados mais significativos foram obtidos por MET onde foi possível determinar a morfologia das zonas GPII presentes na forma acicular (needles) com tamanho aproximado de 30nm na condição T6 e 10nm na condição T6I4-65. A fase metaestável η’ foi identificada na forma de plaquetas finas (platelets) nas condições T7451, T6 e T6I4-65 com tamanho aproximado de 50nm, 20nm e 10nm respectivamente. A rugosidade superficial obtida por AFM revelou que a condição T6I4-65 apresenta maior rugosidade superficial (Ra=14,87nm) quando comparado às condições T7451(Ra=7,65nm) e T6 (Ra=8,35nm), indicando maior densidade de partículas de pequena dimensão distribuída homogeneamente na matriz da liga de alumínio.
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Trivette, Paul S. "A national survey of occupational stress, psychological strain and coping resources in elementary school counselors". Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/38343.
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Topor, James E. "Analysis of grey level weighted Hough transforms". Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07282008-135731/.
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Trump, Karen E. "Characteristics of mildly handicapped children in a small school district". Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/87678.
Testo completoAbstract (sommario):
The study was designed as one component of a program evaluation in special education funded by the State Department of Education in Virginia. The purpose was to identify the characteristics of mildly handicapped children who had been identified as learning disabled, educable mentally retarded and emotionally disturbed in a small school district. The parameters of the study included demographic information, school-based characteristics and assessment data. Student data were collected from the confidential folders maintained by the school district which included all written reports required for assessment and placement. Demographic data were taken from cumulative folders maintained in the schools for the students and reports developed by the building principal. A regression formula was used with the assessment data to determine if learning disabled students exhibited a severe ability-achievement discrepancy statistically. The regression formula and grade equivalent comparisons were conducted with emotionally disturbed students to determine if the emotional disturbance was adversely affecting their educational performance as measured by standardized tests. A constant comparative method was used to analyze the minutes from eligibility committee meetings to determine the important features school-based teams used for their assignment of labels to handicapped children. Comparisons were made between the characteristics of the children identified as handicapped and the state and federal definitions for those handicapping conditions. A discriminant analysis was used to investigate the possibility of predicting which students considered eligible for special education services would be classified learning disabled or emotionally disturbed based on 10 variables. Interviews were conducted with the program evaluation stakeholders committee to solicit their feedback concerning the results of the study.Ed. D.
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Lima, Luis Otavio Ribas de. "Estudo sobre o tratamento térmico de envelhecimento interrompido T6I4-65 e influência na propagação de trinca por fadiga em uma liga de alumínio AA7050". UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2014. http://tede2.uepg.br/jspui/handle/prefix/1462.
Testo completoAbstract (sommario):
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Previous issue date: 2014-06-18Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Aluminum alloys have been the primary material of choice for the aircraft due to their properties such as low density, high mechanical and corrosion resistance. Commercial aircraft apply aluminum alloys for the fuselage, wings and supporting structure due to the extensive knowledge in design and production of aluminum components, and most importantly, aluminum alloys continue to be developed, keeping it highly competitive. A great development happen with the heat-treatable alloys, which allow improvement of the mechanical properties. Among this alloys stand out the Al-Zn-Mg-Cu series, known for high strength, toughness and corrosion resistance. The improvement of those alloys occurs by the precipitation of nanometric particles MgZn2, called η phase. This study’s aim was to promote an interrupted heat treatment T6I4-65 in an AA7050 aluminum alloy, with fatigue crack growth resistance as priority. Interrupted heat treatments’ goal is optimizing the consumption of solute atoms during process of nucleation and growth of precipitates as a finely dispersion. The T6I4-65 condition obtained was analyzed by differential scanning calorimetry, DSC, optical and electronic microscopy, mechanical tests as hardness, tensile and fatigue crack growth. The T6I4-65 treatment results in a microstructure with a fine dispersion of precipitated phase η’, about 75% smaller than those resulting from in current use, T7451. This microstructure resulted in a reduction of up to 24% in fatigue crack growth rate compared to that resulting from T7451 treatment, keeping the ductility of 17% of area reduction and yield strength higher than 400MPa.
Ligas de alumínio são o principal material de uso na indústria aeronáutica devido a suas propriedades como baixa densidade, alta resistência mecânica e a corrosão. Aeronaves comerciais utilizam ligas de alumínio em sua fuselagem, asas e na estrutura de suporte devido ao extenso conhecimento no projeto e produção de componentes em alumínio, e mais importante, as ligas de alumínio continuam a serem desenvolvidas, mantendo-se altamente competitivas. Ocorreu um grande avanço com o desenvolvimento das ligas tratáveis termicamente, que permitiram a otimização das propriedades mecânicas. Entre estas ligas tratáveis, destaca se a família Al-Zn-Mg-Cu, conhecidas pela alta resistência mecânica, tenacidade e resistência a corrosão. O aperfeiçoamento destas ligas ocorre pela precipitação de partículas nanométricas de MgZn2, conhecida como fase η. O objetivo deste trabalho foi obter um tratamento térmico interrompido T6I4-65 em uma liga de alumínio AA7050 com prioridade ao aumento de resistência à propagação de trinca por fadiga. Tratamentos interrompidos tem por objetivo otimizar o consumo de átomos de soluto durante os processos de nucleação e crescimento dos precipitados endurecedores na liga na forma de dispersão finamente dispersa. A condição T6I4-65 obtida foi analisada por meio de calorimetria diferencial de varredura, DSC, microscopia ótica e eletrônica de varredura e transmissão, ensaios mecânicos dureza, tração e propagação de trinca por fadiga. Este tratamento resultou em uma microestrutura com uma dispersão de finos precipitados de fase η’, cerca de 75% menores que os resultantes de tratamentos de uso corrente, T7451. Esta microestrutura promoveu a redução de até 24% na taxa de propagação de trinca por fadiga em comparação à resultante do tratamento T7451, mantendo grande ductilidade, até 17% de redução de área e limite de escoamento superior a 400MPa.
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Šplíchal, Jan. "Návrh snížení počtu svarů u rámových dveří kolejových vozidel z Al slitin". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399353.
Testo completoAbstract (sommario):
This Diploma thesis presents possible proposals of welds number reduction frame doors for rail vehicles welded from profiles from aluminium alloy EN AW 6060, which is heat treated by temper T66. Profiles are welded by TIG process with additional material S Al 5087 (AlMg4,5MnZr). The heat treatment by the welding cycle causes a change in structure of basic material and decrease of mechanical properties due to dissolution of precipitates. To measure the necessary mechanical properties of the material after welding a tensile test was performed on the delivered samples. The resulting values from tensile test were subsequently used as cut – off values in the new door frame design by FEM simulation in Virtual Performance Solution software with PAM – Crash extension. The newly designed frame was welded according to the necessary welding procedure specifications, which are also part of the thesis. The conclusion is devoted to the economic evaluation of the current and new design of the door frame.
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Tornaris, George Andreas. "Traffic flow management under emergency conditions in and around the Virginia Tidewater area tunnels". Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/101325.
Testo completoAbstract (sommario):
Most vehicular tunnels, due to their restrictive and confined environment require continuous traffic surveillance and control. This is achieved by a variety of systems like closed circuit TV monitoring, personnel stationed in the tunnel, overheight & speed detectors and others.
Traffic flow data were obtained from the Interstate 64(I -64) Hampton Roads Bridge-Tunnel. The data were analyzed and conclusions were drawn about traffic flow behavior at the different tunnel sections.
During the operation of a tunnel, capacity reductions are often experienced due to temporary lane closures. These could result from incidences occurring in the tunnel area or due to regular maintenance activities. This work concentrates on the former case. A microcomputer model called Queue and User Cost Evaluation of Work Zones(QUEWZ) was employed in studying lane closure scenarios for the Virginia Tidewater Area Tunnels.
In case of significant capacity reductions or complete blockages of directions of travel, it is desired to know beforehand the impact expected on the surrounding network. Traffic management actions like rerouting policies could be implemented and thus alleviate the problem.
MASSVAC2, a computer simulation model for mass evacuation under emergency conditions was employed for analyzing different traffic management scenarios.M.S.
Libri sul tema "T6I6"
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Correll, Robert, e Julie Adair King. Canon EOS Rebel T6i / 750D for Dummies. Wiley & Sons, Incorporated, John, 2015.
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Correll, Robert, e Julie Adair King. Canon EOS Rebel T6i / 750D for Dummies. Wiley & Sons, Incorporated, John, 2015.
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3
Canon EOS Rebel T6s / T6i: From Snapshots to Great Shots. Peachpit Press, 2015.
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Busch, David D. Canon EOS Rebel T6s/T6i/760D/750D Guide to Digital SLR Photography. Rocky Nook, 2016.
Cerca il testo completoCapitoli di libri sul tema "T6I6"
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Uhríčik, Milan, Peter Kopas, Peter Palček, Tatiana Oršulová e Patrícia Hanusová. "MULTIAXIAL FATIGUE EXPERIMENTAL ANALYSIS OF 6063-T66 ALUMINUM ALLOY OF THE BASE MATERIAL AND THE WELDED MATERIAL". In Quality Production Improvement - QPI, a cura di Robert Ulewicz, 334–41. Warsaw, Poland: Sciendo, 2019. http://dx.doi.org/10.2478/9783110680591-045.
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