Relevant bibliographies by topics / Test Stub

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Test Stub'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Test Stub"

1

Dong, Chang Chun, and Wei Zhao. "Test Analysis of Stiffened T-Stub Connections." Applied Mechanics and Materials 744-746 (March 2015): 319–22. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.319.

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To investigate the effect of stiffener on the stiffness and strength of T-stubs, 3 T-stub connections without stiffeners and 6 stiffened T-stub connections with varied shape and thickness of stiffeners were tested monotonically. The load carrying capacity, relative deformations of endplates and strains on the stiffeners and endplates were measured. The load-deformation curves of the connections and load-strain curves were presented. The test results showed that the commonly used stiffeners in current Chinese practice often yield or/and buckle prematurely. And the stiffener designed by the method can meet the requirement in CECS102-2002, which demands that the stiffener should be able to force the extended portion of endplates from clamped-free boundary to plates fixed on two adjacent boundaries.
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Chan, T. W. K., T. Rezansoff, and M. U. Hosain. "Behavior of headed shear studs in stub–girder stub assemblages." Canadian Journal of Civil Engineering 13, no. 1 (February 1, 1986): 106–15. http://dx.doi.org/10.1139/l86-014.

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The paper summarizes the results of push-off tests conducted on 42 end stub assemblages. Written for conventional composite construction, the current Canadian Standards Association (CSA) standard on stud connectors offers little guidance for stub–girder design. A stud spacing of four times the stud diameter (the CSA requirement) does not appear to be adequate for a full development of the potential shear capacity of a stud connector in the stub–girder system. The required minimum stud spacing appears to be between five and six times the stud diameter for the case of 13 mm studs. Moreover, the CSA-recommended shear capacity of stud connector should be reduced to reflect the effect of prying forces. A modification factor of 0.9 is suggested for a 13 mm diameter stud connector. Test results for specimens with 19 mm studs indicated a further decrease in the shear capacity. However, a definite recommendation is postponed pending further tests.In addition to prying forces, stud configuration and spacing and the amount and location of transverse reinforcement must also be taken into account in determining the shear capacity of a stud connector. For a connection with 13 mm studs arranged in a single row, a reduction factor equal to stud spacing divided by six times the stud diameter is suggested when the stud spacing is less than six times the stud diameter. For a connection with staggered studs, the corresponding factor is obtained by dividing the stud spacing by five times the stud diameter when the stud spacing is less than five times the stud diameter. Key words: headed stud, shear capacity, minimum stud spacing, prying force.
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Ting, Chui Huon Tina, and Hieng Ho Lau. "Compression Test on Cold-Formed Steel Built-Up Back-to-Back Channels Stub Columns." Advanced Materials Research 201-203 (February 2011): 2900–2903. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.2900.

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Built-up sections are used to resist load induced in a structure when a single section is not sufficient to carry the design load for example roof trusses. In current North American Specification, the provision has been substantially taken from research in hot-rolled built-up members connected with bolts or welds [1]. The aim of this paper is to investigate on built-up back-to-back channels stub columns experimentally and theoretically using Effective Width Method and Direct Strength Method. Compression test was performed on 5 lipped channel and 5 back-to-back channels stub columns fabricated from cold-formed steel sheets of 1.2mm thicknesses. The test results indicated that local buckling is the dominant failure modes of stub columns. Therefore, Effective Width Method predicts the capacity of stub columns compared to Direct Strength Method. When compared to the average test results, results based on EWM are 5% higher while results based on DSM are 12% higher for stub column.
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Nadaskay, Anthony J., and C. Dale Buckner. "Direct Model Test of Stub Girder Floor System." Journal of Structural Engineering 111, no. 7 (July 1985): 1504–16. http://dx.doi.org/10.1061/(asce)0733-9445(1985)111:7(1504).

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Wang, Yuan Xi, Xi Kai Du, and Jing Hong Liu. "Research on the mechanical properties of concrete stub column under axial compression loading with square steel tube self-compacting iron tailing." E3S Web of Conferences 165 (2020): 04024. http://dx.doi.org/10.1051/e3sconf/202016504024.

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In this paper, the influence of steel rate and substitution rate of iron tailing powder on the bearing capacity of the stub columns is mainly investigated through the test of five concrete stub columns under axial compression loading with square steel tube self-compacting iron tailing, and the test bearing capacity is compared with the bearing capacity calculated by each code. The test results show that the bearing capacity of the test piece increases obviously with the increase of the steel content; the bearing capacity of the test piece is less affected by the substitution rate of iron tailing powder; it is suggested to use code GB50936-2014 to design and calculate the bearing capacity of the stub column under axial compression loading.
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Huo, Jing Si, Guo Wang Huang, and Yan Xiao. "Effects of Sustained Pre-Load on Residual Strength and Stiffness of Concrete-Filled Steel Tube after Exposure to High Temperatures." Key Engineering Materials 400-402 (October 2008): 769–74. http://dx.doi.org/10.4028/www.scientific.net/kem.400-402.769.

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This paper experimentally investigated the effects of axial load level on the residual strength and stiffness of concrete-filled steel tubular (CFT) stub columns which were heated and cooled down to room temperature under sustained axial load. Eight stub columns were axially loaded and heated to specified high temperatures in a purpose-built electric furnace. After the specimens cooled down to room temperature while the axial load was kept constant, the stub columns were loaded to failure. The test results show that not only the axial load level and the high temperature exposure have significant effects on the residual strength and stiffness of stub column, but the residual strength index and stiffness index of the fire-damaged CFT stub columns with pre-load are remarkably different from those without pre-load. From the test results, it is recommended that the sustained axial load effects and the fire cooling phase should be taken into consideration in assessing the fire-damaged CFT columns.
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Chen, Shi Zhe, Zhan Wang, and Chao Zhou. "Performance Study for T-Stub Considering the Bending Capacity of Bolt." Applied Mechanics and Materials 741 (March 2015): 175–78. http://dx.doi.org/10.4028/www.scientific.net/amm.741.175.

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The bending capacity of the beam end-plate or the column flange and the tensile property of the bolt could be expressed by an equivalent t-stub model. In this paper, ten groups of different sizes of T-stub are designed for monotonic loading test. The accurate element models are established for comparable study with the experimental result. The stress distribution and deformation characteristics of the T-stub and bolts are determined. A theoretic formula of tensile stiffness for T-stub is derived, it is presented that the calculation results are consistent with the tests.
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Jain, Abhinav, and Rana Pratap Yadav. "Design and development of rigid coaxial line based variable stub tuner." Frequenz 75, no. 5-6 (February 22, 2021): 153–58. http://dx.doi.org/10.1515/freq-2020-0085.

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Abstract This paper presents a novel design of rigid coaxial line based variable stub tuner. It incorporates controlled drive for the movement of shorting ring along the length of the stub inside the coaxial line. The ring is housed inside stub through linear slot over the coaxial conductor. Inbuilt slot at outer conductor of coaxial line introduces undesirable discontinuity which deteriorates the performance of the stub. It needs to be compensated to get the desirable performance of tuner. The effect of discontinuity has been analyzed using circuit modelling and compensated in design itself for the desired performance. The compensated tuner has been fabricated and tested where test results are found as return loss better than 25 dB and Voltage Standing Wave Ratio (VSWR) in between 1.1 and 1.9 in the frequency range of 80–850 MHz. The presented work is useful for the development of high power stub tuner in the range of High Frequency (HF), Very High Frequency (VHF) and Ultra High Frequency (UHF) which is an interest of wide spread applications in areas of communication, defence, satellite, radar, tokamak etc.
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Zhu, Xiaoming, and Zhaoqi Wu. "Study on New Bolted T-Stub Connection with Inserted Plates under Axial and Cyclic Loads." Applied Sciences 10, no. 7 (April 10, 2020): 2631. http://dx.doi.org/10.3390/app10072631.

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The bolted T-stub connection joining beam with column is being widely applied. To enhance the energy dissipation capacity of conventional T-stub connections, two rectangular plates are proposed to be inserted between the T-stub and column, so that the T-stub flange can yield both under tensile and compressive loads. This study put forward a mechanical model of a new T-stub connection with inserted plates and investigated important factors that could affect its mechanical behavior through experimental tests. Thirty specimens were designed with different configurations that differed according to the existence or absence of inserted plates, the fabrication method and the width of inserted plates. These configurations were tested under axial and cyclic loading conditions, and results showed that the proposal aiming to improve the energy dissipation capacity was feasible. The mechanical model presented coincided with the test observation and data. The advent of two inserted plates elevated the load bearing capacity, stiffness and ductility of connections under compression, whereas in tension the properties were not substantially enhanced. The welded T-stub connections outperformed those cut from standard section steel. The energy dissipated by connections with inserted plates was about 150% of that by traditional connections without inserted plates. Only within a reasonable range can the increment of plate width promote the energy dissipation capacity of T-stub connections. The optimum width of plates in terms of energy consumption accounted for around 31% of the overall width of connections.
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Wang, Wei, Chenchen Zhang, Zeshen Li, and Xuehong Gan. "A Study on the Application of Two Different Material Constitutive Models Used in the FE Simulation of the Cyclic Plastic Behavior of a Steel Beam-Column T-Stub Connection." Advances in Civil Engineering 2021 (February 8, 2021): 1–14. http://dx.doi.org/10.1155/2021/8868015.

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Seismic actions inevitably cause cyclic plastic deformations in steel frame connections, which is a common cause of failure in steel structures. Nonlinear finite element (FE) static analysis has been employed in the study of the cyclic plastic behavior of a T-stub connection based on the reported cyclic test on the corresponding extensively tested T-stub connection made of Q235 steel. In particular, the isotropic-hardening and Chaboche constitutive models were employed to predict both the stress distribution and plastic development on the T-stub and the hysteretic curves of the entire T-stub connection. The two constitutive models were calibrated by four material tests to describe the yield and hardening behaviors of the Q235 steel used to make this T-stub connection. The two sets of simulation results obtained from the simulations of the two FE models employed by the two different constitutive models were compared with each other and with the experimental results. The comparisons reveal that the simulation results are similar and in good agreement with the experimental results when the cumulative plastic deformation in the T-stub is small. However, the results of the FE analysis using the Chaboche model are in better agreement with the experimental results when the cumulative deformation in the T-sub is large. This study can provide a reference for FE simulation of the cyclic plastic behavior of steel connections, including the T-stub connection.
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Dissertations / Theses on the topic "Test Stub"

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Nuttayasakul, Nuthaporn. "Experimental and Analytical Studies of the Behavior of Cold-Formed Steel Roof Truss Elements." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29765.

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Cold-formed steel roof truss systems that use complex stiffener patterns in existing hat shape members for both top and bottom chord elements are a growing trend in the North American steel framing industry. When designing cold-formed steel sections, a structural engineer typically tries to improve the local buckling behavior of the cold-formed steel elements. The complex hat shape has proved to limit the negative influence of local buckling, however, distortional buckling can be the controlling mode of failure in the design of chord members with intermediate unbraced lengths. The chord member may be subjected to both bending and compression because of the continuity of the top and bottom chords. These members are not typically braced between panel points in a truss. Current 2001 North American Specifications (NAS 2001) do not provide an explicit check for distortional buckling. This dissertation focuses on the behavior of complex hat shape members commonly used for both the top and bottom chord elements of a cold-formed steel truss. The results of flexural tests of complex hat shape members are described. In addition, stub column tests of nested C-sections used as web members and full scale cold-formed steel roof truss tests are reported. Numerical analyses using finite strip and finite element procedures were developed for the complex hat shape chord member in bending to compare with experimental results. Both elastic buckling and inelastic postbuckling finite element analyses were performed. A parametric study was also conducted to investigate the factors that affect the ultimate strength behavior of a particular complex hat shape. The experimental results and numerical analyses confirmed that modifications to the 2001 North American Specification are necessary to better predict the flexural strength of complex hat shape members, especially those members subjected to distortional buckling. Either finite strip or finite element analysis can be used to better predict the flexural strength of complex hat shape members. Better understanding of the flexural behavior of these complex hat shapes is necessary to obtain efficient, safe design of a truss system. The results of these analyses will be presented in the dissertation.
Ph. D.
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Rambo-Roddenberry, Michelle. "Behavior and Strength of Welded Stud Shear Connectors." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26989.

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The behavior and strength of welded shear studs are subjects of ongoing study. In recent years, research has shown that the American Institute of Steel Construction (AISC) specification equations for shear stud strength are unconservative for studs placed in deck with ribs transverse to the steel beam. Twenty-four solid slab push-out tests, 93 composite slab push-out tests, and bare stud tests were performed to study the effects on stud strength of friction, normal load, position of studs in the ribs of steel deck, concrete strength, and stud properties. Stud diameters ranged from 3/8 in. to 7/8 in., deck heights ranged from 2 in. to 6 in., and both single and pairs of studs were tested. The push-out test results from this study were combined with other studies to propose a new stud strength prediction model. Three new beam tests were performed to study the effect of the stud position in the ribs of the steel deck. The results of these tests, along with 61 other beam tests, were used to verify the new stud strength prediction model. A reliability study was performed to determine resistance factors for stud strength and beam strength.
Ph. D.
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Ré, Reginaldo. "Uma contribuição para a minimização do número de stubs no teste de integração de programas orientados a aspectos." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-28042010-114822/.

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A programação orientada a aspectos é uma abordagem que utiliza conceitos da separação de interesses para modularizar o software de maneira mais adequada. Com o surgimento dessa abordagem vieram também novos desafios, dentre eles o teste de programas orientados a aspectos. Duas estratégias de ordenação de classes e aspectos para apoiar o teste de integração orientado a aspectos são propostas nesta tese. As estratégias de ordenação tem o objetivo de diminuir o custo da atividade de teste por meio da diminuição do número de stubs implementados durante o teste de integração. As estratégias utilizam um modelo de dependências aspectuais e um modelo que descreve dependências entre classes e aspectos denominado AORD (Aspect and Oriented Relation Diagram) também propostos neste trabalho. Tanto o modelo de dependências aspectuais como o AORD foram elaborados a partir da sintaxe e semântica da linguagem AspectJ. Para apoiar as estratégias de ordenação, idealmente aplicadas durante a fase de projeto, um processo de mapeamento de modelos de projeto que usam as notações UML e MATA para o AORD é proposto neste trabalho. O processo de mapeamento é composto de regras que mostram como mapear dependências advindas da programação orientada a objetos e também da programação orientada a aspectos. Como uma forma de validação das estratégias de ordenação, do modelo de dependências aspectuais e do AORD, um estudo exploratório de caracterização com três sistemas implementados em AspectJ foi conduzido. Durante o estudo foram coletadas amostras de casos de implementação de stubs e drivers de teste. Os casos de implementação foram analisados e classificados. A partir dessa análise e classificação, um catálogo de stubs e drivers de teste é apresentado
Aspect-oriented programming is an approach that uses principles of separation of concerns to improve the sofware modularization. Testing of aspect-oriented programs is a new challenge related to this approach. Two aspects and classes test order strategies to support integration testing of aspect-oriented programs are proposed in this thesis. The objective of these strategies is to reduce the cost of testing activities through the minimization of the number of implemented stubs during integration test. An aspectual dependency model and a diagram which describes dependencies among classes and aspects called AORD (Aspect and Object Relation Diagram) used by the ordering strategies are also proposed. The aspectual dependency model and the AORD were defined considering the syntax constructions and the semantics of AspectJ. As the proposed estrategies should be applied in design phase of software development, a process to map a desing model using UML and MATA notations into a AORD is proposed in order to support the ordering strategies. The mapping process is composed by rules that show how to map both aspect and object-oriented dependencies. A characterization exploratory study using three systems implemented with AspectJ was conducted to validate the ordering strategies, the aspectual dependency model and the AORD. Interesting samples of stubs implementations were collected during the study conduction. The stubs were analyzed and classified. Based on these analysis and classification a catalog of stubs and drivers is presented
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Mudduluru, Sandhya. "Investigation of Test-Driven Development based on Mock Objects for Non-OO Languages." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-78643.

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In traditional software development, bug detection or testing comes as an afterthought. However, bugs are difficult to detect in the later stages of software development that result in long debugging time. Usually, bugs are left out because of higher concentration on development effort, leaving lesser time for testing. Test-Driven Development (TDD) is a software development process that can reduce the debugging time by catching most of the bugs during development. The development is carried on in small and repeated steps based on test cases. However, TDD is designed to work for object-oriented languages. This thesis investigates the suitability of TDD for non-Object Oriented (OO) languages such as C. TDD can be used with C language with the help of stubbing concept. This thesis also evolves the concepts of stubs and mocks in TDD to be used with C to solve dependency related problems. Finally this thesis analyses some frameworks for TDD in C and provides the trade-offs between them.
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Muráň, Michal. "Návrh a implementace průběžné integrace ve společnosti Logio." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2015. http://www.nusl.cz/ntk/nusl-264949.

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This master's thesis describes the possibility of using a continues integration and testing in real company Logio. The result of thesis is implementation of continuous integration tools Jenkins and specific testing for the company Logio. The theoretical part deals with basic principles, techniques and tools defining continuous integration. Subsequently are describing existing tools designed for PHP programming language. The thesis also analyzes various types and possibilities of application testing. Also explains the problems in product development in company Logio, which are consequence of the need for introducing continues integration techniques. The practical part of thesis describes the implementation of a test framework PwTester and its use in continuous integration. In conclusion, the results are evaluated and outlined the possibility of extension.
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Biasi, Luciano Bathaglini. "Geração automatizada de drivers e stubs de teste para JUnit a partir de especificações U2TP." Pontifícia Universidade Católica do Rio Grande do Sul, 2006. http://hdl.handle.net/10923/1691.

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Testing has become essential to assure the quality of software products. Within the process test, unit test is performed on the smallest funcional part of the software and it aims at discovering defects in these units. JUnit is a unit test tool, which assists developers in the automation of tests and verification of results. However, much time, cost and effort are still spent to codify drivers and stubs, which most of the time jeopardizes its use. Another problem found in the unit test is the need of cases test specification in a higher level language, which is independent of any specific programming language. The Test Profile of UML 2. 0 (U2TP) solves this problem, because it allows to represent and document all artifacts used in the test process. This work aims at the fully automated generation of test drivers and stubs for JUnit from U2TP test specifications. A case study has shown that the developed algorithms correctly generated all test code, considering all elements explored in this work. The main goal of the case study was the validation of the correctness of the generated code, as well as the quantitative analysis of time consumed and number of code lines generated.
Atualmente a área de teste de software tem se tornado fundamental para garantia da qualidade dos produtos desenvolvidos. Dentro do processo de teste, o teste unitário é realizado na menor parte funcional de um software e visa descobrir defeitos nestas unidades. JUnit é uma ferramenta de apoio ao teste unitário, a qual auxilia desenvolvedores na automação dos testes e verificação dos resultados. Porém, muito tempo, custo e esforço ainda são gastos para codificar os drivers e os stubs de teste necessários a esta ferramenta, o que muitas vezes inviabiliza o seu uso. Outro problema encontrado no processo de teste unitário é a necessidade de especificação dos casos de teste em uma linguagem de mais alto nível, que seja independente de linguagem de programação. O Perfil de Teste da UML 2. 0 (U2TP) resolve este problema, pois permite representar e documentar todos artefatos utilizados no processo de teste. Esta dissertação de mestrado tem por objetivo a geração totalmente automatizada de drivers e stubs de teste para ferramenta JUnit a partir de especificações de testes modeladas com a U2TP. Um estudo de caso mostrou que os algoritmos propostos geraram corretamente todo código de teste para todos elementos explorados neste trabalho. O estudo de caso teve como principais objetivos a validação correta do código gerado, bem como uma análise quantitativa em relação ao tempo envolvido e número de linhas de código geradas.
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Biasi, Luciano Bathaglini. "Gera??o automatizada de drivers e stubs de teste para JUnit a partir de especifica??es U2TP." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2006. http://tede2.pucrs.br/tede2/handle/tede/5043.

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Atualmente a ?rea de teste de software tem se tornado fundamental para garantia da qualidade dos produtos desenvolvidos. Dentro do processo de teste, o teste unit?rio ? realizado na menor parte funcional de um software e visa descobrir defeitos nestas unidades. JUnit ? uma ferramenta de apoio ao teste unit?rio, a qual auxilia desenvolvedores na automa??o dos testes e verifica??o dos resultados. Por?m, muito tempo, custo e esfor?o ainda s?o gastos para codificar os drivers e os stubs de teste necess?rios a esta ferramenta, o que muitas vezes inviabiliza o seu uso. Outro problema encontrado no processo de teste unit?rio ? a necessidade de especifica??o dos casos de teste em uma linguagem de mais alto n?vel, que seja independente de linguagem de programa??o. O Perfil de Teste da UML 2.0 (U2TP) resolve este problema, pois permite representar e documentar todos artefatos utilizados no processo de teste. Esta disserta??o de mestrado tem por objetivo a gera??o totalmente automatizada de drivers e stubs de teste para ferramenta JUnit a partir de especifica??es de testes modeladas com a U2TP. Um estudo de caso mostrou que os algoritmos propostos geraram corretamente todo c?digo de teste para todos elementos explorados neste trabalho. O estudo de caso teve como principais objetivos a valida??o correta do c?digo gerado, bem como uma an?lise quantitativa em rela??o ao tempo envolvido e n?mero de linhas de c?digo geradas.
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Forsling, Parborg Emma. "Towards replacing the remote control with commodity smart-phones through evaluation of interaction techniques enabling television service navigation." Thesis, Linköpings universitet, Medie- och Informationsteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-144581.

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The aim for this project was to develop an application that would be compatible with set-top boxes, or other browser based applications, and re-search what interaction techniques that could be considered a viable substitute for a the traditional remote controller without requiring the visual attention of the viewer User test was also performed in the interest of broadly evaluating the different interaction techniques used in the application, and how the UI itself, including non visual feedback from both the sender and receiver side is perceived.
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Lacroix, Daniel. "Behaviour of Light-frame Wood Stud Walls Subjected to Blast Loading." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24339.

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Deliberate and accidental explosions along with the heightened risk of loss of life and property damage during such events have highlighted the need for research in the behaviour of materials under high strain rates. Where an extensive body of research is available on steel and concrete structures, little to no details on how to address the design or retrofitting of wood structures subjected to a blast threat are available. Studies reported in the literature that focused on full scale light-frame wood structures did not quantify the increase in capacity due to the dynamic loading while the studies that did quantify the increase mostly stems from small clear specimens that are not representative of the behaviour of structural size members with defects. Tests on larger-scale specimens have mostly focused on the material properties and not the structural behaviour of subsystems. Advancements in design and construction techniques have greatly contributed to the emergence of taller and safer wood structures which increase potential for blast threat. This thesis presents results on the flexural behaviour of light-frame wood stud walls subjected to shock wave loading using the University of Ottawa shock tube. The emphasis is on the overall behaviour of the wall subsystem, especially the interaction between the sheathing and the studs through the nailed connection. The approach employed in this experimental program was holistic, where the specimens were investigated at the component and the subsystem levels. Twenty walls consisting of 38 mm x 140 mm machine stress-rated (MSR) studs spaced 406 mm on center and sheathed with two different types and sheathing thicknesses were tested to failure under static and dynamic loads. The experimental results were used to determine dynamic increase factors (DIFs) and a material predictive model was validated using experimental data. The implications of the code are also discussed and compared to the experimental data. Once validated, an equivalent single-degree-of-freedom (SDOF) model incorporating partial composite action was used to evaluate current analysis and design assumptions. The results showed that a shock tube can effectively be used to generate high strain-rate flexural response in wood members and that the material predictive model was found suitable to effectively predict the displacement resulting from shock wave loading. Furthermore, it was found that current analysis and design approaches overestimated the wall displacements.
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Camara, Aliou Badara. "Analyse du comportement en fatigue d'assemblages boulonnés." Thesis, Université Clermont Auvergne‎ (2017-2020), 2019. http://www.theses.fr/2019CLFAC105.

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L’intégrité structurelle des composants mécaniques et de leurs assemblages est un objectif majeur de conception. Les applications peuvent concerner l’aéronautique, l’automobile, le ferroviaire ainsi que les ouvrages tels que les ponts ou encore des mâts soumis à des sollicitations cycliques ou à amplitude variable. Cela amène l’ingénieur de conception à prendre en compte différents phénomènes dont celui de la fatigue, facteur dominant pouvant conduire, sous sollicitation dynamique, à la défaillance des structures ou de certaines pièces les constituant. Un outil de post-traitement a, d’une part, été développé et implémenté sous Matlab pour évaluer le niveau d’endommagement à la limite d’endurance fixée du matériau (2.106 cycles) et, d’autre part, une démarche itérative a été proposée pour le calcul de durée de vie en fatigue. Les deux critères multiaxiaux de fatigue utilisés sont le critère de Dang Van (approche de type plan critique) et celui de Zenner (approche intégrale). L’outil de post-traitement est validé par des résultats d’essais de fatigue issus de la bibliographie. Ces essais de fatigue sont réalisés sur des boulons M10 de classe de qualité 8.8. Les résultats établis sont comparés avec ceux obtenus à partir des normes existantes (Eurocode 3 et VDI 2230 notamment). Les deux critères multiaxiaux de fatigue retenus dans le cadre de ce travail sont confrontés à la banque de données des essais multiaxiaux qu’on trouve dans lalittérature. Les assemblages, boulonnés ou soudés, constituent des zones singulières dans les structures. Dans le butde mieux comprendre le comportement en fatigue du boulon dans un assemblage, un tronçon en té boulonné dans lequel le boulon peut être précontraint par serrage est modélisé par éléments finis sous le logiciel Salomé-méca. La précharge est modélisée numériquement en imposant un déplacement axial relatif entre les noeuds de l’écrou et ceux de la tige de la vis. L’effort axial FB et le moment fléchissant MB obtenus dans la vis avec le modèle numérique du tronçon en té sont validés par des solutions analytiques et des analyses expérimentales (essais de traction statique sur tronçon en té). Une étude paramétrique est menée pour analyser les influences en fatigue de la précharge dans le boulon, du diamètre de celui-ci, de son excentration par rapport à l’âme du tronçon en té et de l’épaisseur de la semelle. L’analyse s’est intéressée d’abord au niveau d’endommagement du boulon, puis à sa durée de vie en fatigue multiaxiale en utilisant l’outil de post-traitement construit dans le cadre du présent travail. Les simulations numériques de l’endommagement et de la durée de vie en fatigue montrent un comportement différent des deux approches utilisées de la fatigue multiaxiale pour la prise en compte de l’effet d’un pré-serrage important. Enfin, une campagne d’essais expérimentaux sur des tronçons en té a également été menée pour la validation du modèle numérique par rapport à l’effort axialFB et au moment de flexion MB dans le boulon
The structural integrity of mechanical components and their assemblies is a major design purpose. The applications may concern the aeronautics, the automobile, the railway as well as structures such as bridges or masts subjected to cyclic loads or to variable amplitude stress states. This leads the design engineer to take into account various phenomena, including fatigue, a dominant factor that may lead, under dynamic stress, to the failure of structures or parts of them. The mechanical components are generally subjected in service to multiaxial stress states. Taking into account the triaxiality of stress states requires the use of multiaxial fatigue criteria. They are suitable tools for assessing the material fatigue resistance against periodical stress states, especially when they are multiaxial. A fatigue post-processing tool is developed and implemented under Matlab software to assess on the one hand, the damage level at the fixed endurance limit of the material (2.106 cycles) and, on the other hand, the fatigue life up to crack initiation from an iterative fatigue calculation process. The two multiaxial fatiguecriteria used are Dang Van criterion (critical plane approach) and Zenner criterion (integral approach). Then, the fatigue post-processing tool is validated by fatigue test results from the bibliography. These fatigue tests are performed on M10 bolts of 8.8 quality class. The results are compared with those obtained from existing standards (Eurocode 3 and VDI 2230). The two multiaxial fatigue criteria used inthis work are compared and validated from the database of multiaxial tests found in the literature. Bolted or welded assemblies are singular areas in the structures. In order to better understand the fatiguebehavior of the bolt in an assembly, a tee-stub in which the bolt can be pre-stressed by clamping is modeled by finite elements under Salome-meca software. The preload is modeled numerically by imposing a relative axial displacement between the nodes of the nut and those of the rod of the screw. The FB axial force and the MB bending moment obtained in the screw with the numerical model of the tee-stub is validated by analytical solutions on the one hand and by experimental results (static tension tests on a tee-stub) on the other hand. A parametric study is conducted to analyze the fatigue influences of the bolt preload, its diameter, its location with respect to the tee-stub soul and the flange thickness. The analysis first focused on the bolt damage level, then on its fatigue life using the multiaxial fatigue post-processing tool built as part of this work. Numerical simulations of damage and fatigue life show a different behavior of the two multiaxial fatigue approaches to take into account the effect of a significanttightening. Experimental tests run on a tee-stub were also conducted to validate the numerical model with respect to the FB axial force and the MB bending moment
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Books on the topic "Test Stub"

1

Kolby, Jeff. GMAT PrepCourse. Los Angeles, CA: Nova Press, 1999.

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Kolby, Jeff. GMAT PrepCourse. Los Angeles, CA: Nova Press, 2001.

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van, Pelt W., and F. J. Hartman. Invoeringswet: Wet inkomstenbelasting 2001 : tekst en toelichting op de Invoeringswet Wet IB 2001 (Stb. 2001,1). 3rd ed. Amersfoort: Sdu Fiscale & Financiële Uitgevers, 2001.

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Jaffe, Eugene D. Barron's pass key to the GMAT (Computer-Adaptive Graduate Management Admission Test). 3rd ed. Hauppauge, NY: Barron's Educational Series, 2001.

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1970-, Johnson Drew, ed. Parent's guide to the Ohio proficiency tests for grade 4 : reading, writing, and mathematics. New York: Simon & Schuster, 2000.

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G, Bush Harold, and Langley Research Center, eds. Structural test documentation and results for the McDonnell Douglas all-composite wing stub box. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1997.

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Correlation of structural analysis and test results for the McDonnell Douglas stitched/RFI all-composite wing stub box. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1996.

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V, Kibbe C. Cosmet Stud Aptitude Test-Span. Delmar Learning, 1989.

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Marko, Pavlyshyn, and Monash University. Dept. of Slavic Languages., eds. Stus i︠a︡k tekst. Melʹborn: Universytet im Monasha Viddil Slavistyky, 1992.

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Munem, Et Al. Test Manual T/A Alg Coll Stud: Subj. Institute of Electrical & Electronics Enginee, 1988.

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Book chapters on the topic "Test Stub"

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Dörre, Jochen, and Ingo Raasch. "The STUF workbench." In Text Understanding in LILOG, 55–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/3-540-54594-8_51.

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Dörre, Jochen. "The language of STUF." In Text Understanding in LILOG, 39–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/3-540-54594-8_49.

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Seiffert, Roland. "Chart-parsing of STUF grammars." In Text Understanding in LILOG, 51–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/3-540-54594-8_50.

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Dörre, Jochen, and Roland Seiffert. "A formalism for natural language — STUF." In Text Understanding in LILOG, 29–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/3-540-54594-8_48.

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Beerepoot, C. C., R. N. van Donk, H. E. G. M. C. Hermans, and J. J. M. Linders. "Tekst WTG ExPres (Stb. 2005, 24)." In Algemene Wet Bijzondere Ziektekosten, 874–79. Houten: Bohn Stafleu van Loghum, 2010. http://dx.doi.org/10.1007/978-90-313-8820-2_103.

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Huynh, Le Anh Thi, Cao Hung Pham, and Kim J. R. Rasmussen. "Numerical Simulations of Cold-Rolled Aluminium Alloy 5052 Channel Sections in Stub Column Tests." In Lecture Notes in Civil Engineering, 202–12. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6713-6_19.

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Brust, F. W., P. Dong, and T. Kilinski. "Welded plate and T-stub tests and impact on structural behavior of moment frame connections." In Behaviour of Steel Structures in Seismic Areas, 141–46. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211198-21.

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"Stub column test procedure." In Testing of Metals for Structures, 393–94. CRC Press, 1991. http://dx.doi.org/10.1201/9781482267068-41.

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"Table 1. Stub column test." In Tubular Structures V, 168. CRC Press, 2004. http://dx.doi.org/10.1201/9781482271355-85.

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"test results using the stub yield." In Tubular Structures V, 183. CRC Press, 2004. http://dx.doi.org/10.1201/9781482271355-96.

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Conference papers on the topic "Test Stub"

1

Letavin, Denis A., Victor A. Chechetkin, and Yuriy E. Mitelman. "Compact Four-Stub Coupler." In 2018 IEEE East-West Design & Test Symposium (EWDTS). IEEE, 2018. http://dx.doi.org/10.1109/ewdts.2018.8524671.

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Bowen, Judy, and Swikrit Khanal. "Test Stub Generation from Interaction and Behavioural Models." In EICS '18: ACM SIGCHI Symposium on Engineering Interactive Computing Systems. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3220134.3220138.

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Ré, Reginaldo, Otávio Augusto Lazzarini Lemos, and Paulo Cesar Masiero. "Minimizing stub creation during integration test of aspect-oriented programs." In the 3rd workshop. New York, New York, USA: ACM Press, 2007. http://dx.doi.org/10.1145/1229384.1229385.

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Letavin, Denis A., and Ilya A. Terebov. "Investigation of a Broadband Five-Stub 3 dB Coupler Using Microstrip Cells." In 2020 IEEE East-West Design & Test Symposium (EWDTS). IEEE, 2020. http://dx.doi.org/10.1109/ewdts50664.2020.9224938.

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Zhong, Jia, Han Wang, Nan Wang, Jinyi Zhang, Yujia Liu, Wen Liu, and Kai Zhang. "Numerical and Theoretical Study on Parameter Selection of Acoustic Load Test of Steam Dryer." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-61023.

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In recent years some reactors have experienced significant steam dryer cracking. The cause of the dryer’s failure was considered as flow-induced acoustic resonance at the stub pipes of the safety relief valves (SRVs) on the main steam lines (MSLs). A research program was started to investigate the acoustic resonance of the steam dryer. Most studies used scaled down method, while our research based on the full scale steam dryer of the prototype CAP1400 but with only one unit of the steam dryer. The purpose of our research program is to study the strength of the steam dryer under flow-induced acoustic resonance. This paper introduces the parameter selection of the main pipe and the stub pipe through numerical method and theoretical method.
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Takahashi, Shiro, Keita Okuyama, Akinori Tamura, Yasuhiro Mabuchi, Teppei Kubota, and Kazuhiro Yoshikawa. "Development of BWR Steam Dryer Loading Evaluation Methods Through Scale Model Tests Under Actual Steam Conditions." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97564.

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It has been demonstrated that intense fluctuating pressures acted on the steam dryer in a boiling water reactor (BWR) at higher velocity flows than in normal operation through actual BWR plant tests [1] and scale model air tests [2]. The cause of the dryer loading was considered as flow-induced acoustic resonance at the stub pipes of safety relief valves (SRVs) in the main steam lines (MSLs). Acoustic resonance was considered to be generated by interaction between the sound field and an unstable shear layer across the closed side branches of the SRV stub pipes. We have started a research program on BWR dryers to develop their loading evaluation methods. Some air scale tests were conducted and those are useful for evaluation of occurrence of acoustic resonance in SRV stub pipes and characteristics of fluctuating pressure in MSLs. However, it is a possibility that differences in pressure conditions and fluid proprieties caused the dryer loading to be underestimated. In the present study, we conducted scale tests under actual steam conditions to evaluate the scale model test methods for BWR dryer loading estimation. The Hitachi Utility Steam Test Leading facility (HUSTLE) was used for the scale model steam tests of MSLs and a steam dryer. Steam which was at the same pressure and temperature conditions as an actual BWR was used in the tests. The test apparatus consisted of the steam dryer, steam dome and 4 MSLs with 20 SRV stub pipes. We demonstrated that acoustic resonance occurred in the SRV stub pipes and fluctuating pressure which propagated from the SRVs to the dryer caused fluctuating stress on the steam dryer at the SRV resonance frequency. The increasing of fluctuating pressure due to the double vortex mode which occurred at a Strouhal number (St) from 0.8 to 0.9 could be clearly seen in the scale model steam tests unlike in the air tests. It was possible that self excited acoustic resonance was affected by the low pressure conditions and different fluid proprieties for the scale model air tests. However, no significant influence from steam pressure was seen at more than 3MPa. Normalized fluctuating pressure was almost the same regardless of pressure. We verified that normalization by dynamic pressure in the main pipe was a reasonable approach for evaluation of fluctuating pressure in the SRV stub pipes. Increasing of fluctuating pressure due to the double vortex mode was clearly distinguished for SRV stub pipes but became smaller for MS pipes and had insignificant impact on the dryer loading.
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Takahashi, Shiro, Masaya Ohtsuka, Keita Okuyama, Takashi Ito, and Kazuhiro Yoshikawa. "Experimental Study of Acoustic and Flow-Induced Vibrations in BWR Main Steam Lines and Steam Dryers." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61318.

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The boiling water reactor (BWR-3) in the Quad Cities (QC) Unit 2 Nuclear Power Plant experienced a significant increase in steam moisture under extended power up-rate (EPU) conditions. Inspection of the stem dryer showed it was likely that BWR steam dryer had been damaged by high cycle fatigue due to acoustic-induced vibration. The cause of the dryer failure was considered as flow-induced acoustic resonance at the stub pipes of safety relief valves (SRVs) in the main steam lines (MSLs). Acoustic resonance was considered to be generated by interaction between the sound field and an unstable shear layer across the closed side branches of the SRV stub pipes. We have started a research program on BWR dryers to develop their loading evaluation methods. Moreover, it has been necessary to evaluate the dryer integrity of BWR-5 plants which are the main type of BWR in Japan. In the present study, we used 1/10-scale BWR tests and analysis to investigate the flow-induced acoustic resonance in SRV stub pipes and propagation of fluctuating pressure from SRVs to the dryer through the MSLs. The test apparatus consisted of a steam dryer, a steam dome and 4 MSLs with 20 SRV stub pipes. Acoustic analysis was also applied to evaluate the propagation of fluctuating pressure from MSLs to the dryer. We demonstrated that acoustic resonance occurred in SRV stub pipes at higher velocity flows than in the normal operation and fluctuating pressure propagated from SRVs to the dryer. The amplitude of the fluctuating pressure due to several stub pipes was much larger than that in one stub pipe because of interaction between them. The fluctuating pressure generated in stub pipes was propagated to the dryer through the MSLs with decreasing amplitude. The amplitude of the fluctuating pressure observed at the top of stub pipes was reduced significantly in the MSLs and maintained fairly well in the steam dome. The flow-induced acoustic resonance did not occur for Strouhal number above 0.6 in the MSLs system of the BWR-5. Results of the tests were compared with those of acoustic analysis. The acoustic analysis could well predict the dryer loading.
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Liao, Feiyu, Chao Hou, W. J. Zhang, and J. Ren. "Tests on sea sand concrete-filled stainless steel tubular stub columns." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.6937.

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This paper presents a series of tests on sea sand concrete-filled stainless steel tubular (SSCFST) stub columns under axial compression, where the main test parameters include type of fine aggregates (river sand, desalted sea sand and sea sand), steel ratio, and concrete strength. The failure mode, axial load versus axial shorten response, cross-sectional strength of the SSCFST specimens are investigated and compared with those of traditional composite columns with normal concrete. The confinement effect between stainless tube and the sea sand concrete is also evaluated. High strength and good ductility was observed for the tested SSCFST stub columns. In general, when being used as the concrete core in a composite column, differences of confinement behaviour between sea sand concrete and normal concrete are not significant, indicating the potential adoption of SSCFST columns in practice.
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Attia, Marco S., Richard W. Eustace, and Shane C. Favaloro. "The Predicted and Measured Effects of Increasing Back Pressure on the Performance of a Turboshaft Engine." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22323.

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This paper presents a comparison between the predicted effect of an increase in backpressure on a turboshaft helicopter engine and the actual results measured in an experimental test program. A generic engine performance program was used to perform a sensitivity study to identify the effect of increases in power turbine exit pressure (backpressure) on other engine performance parameters. The analysis showed that as the backpressure increases the engine increases fuel flow to produce a constant shaft torque (or horsepower), until the maximum power turbine entry temperature is reached. Once this occurs, fuel flow can no longer increase and thus further increases in backpressure cause a decrease in output torque. These predicted results are then compared with the actual effect as measured on a T55-GA-714A engine in a static test facility. The tests involved replacing the standard engine tail pipe with one of three shorter stub ducts which increased the backpressure by employing straight and convergent flow passages instead of the divergent passage on the standard tail pipe. The test-cell data identified that the stub ducts increase specific fuel consumption by between 0.016 and 0.039 lb/hr/hp, while the turbine inlet temperature increased by up to 108 deg F. This temperature increase means that the power output will become turbine temperature limited at a lower ambient temperature than would otherwise occur. Results showed that when temperature limiting exists the power output will be reduced by between 115 and 400 SHP depending on the choice of stub duct.
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He, Ziqi, Dan Gan, Tao Zhang, and Xuhong Zhou. "Experimental investigation on the bamboo-concrete filled circular steel tubular stub columns." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7138.

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Concrete-filled steel tubes have been widely used all over the world due to their superior structural behaviour. To promote the use of ecofriendly materials and to reduce the use of concrete, this paper presents an innovative type of composite column, which can be referred as bamboo-concrete filled steel tubes. In this kind of column, concrete filled in the space between the external steel tube and the inner raw moso bamboo. Bamboo-concrete filled steel tubes inherit the merits of concrete-filled steel tubes such as high load-bearing capacity and ductility performance. Besides, global buckling behaviour of a bamboo column due to its relatively large slenderness can be significantly improved, and the bamboo column with nodes could provide confinement to the infilled concrete. This paper investigated the composite effect of bamboo-concrete filled steel tubular stub columns subjected to axial compression. In addition, concrete-filled double-skin steel tubular stub columns and hollow concrete-filled steel tubular stub columns were also tested for comparison. The main experimental parameter considered was the diameter-to-thickness ratio (D/t) of steel tube. Test results indicated that the composite columns with moso bamboo pipe as inner core elements showed better ductility than the hollow concrete-filled steel tubular stub columns. The bearing capacity and ductility visibly increased with decreasing of the D/t ratio.
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Reports on the topic "Test Stub"

1

WANG, Liping, Xing-Xing CAO, Fa-Xing DING, and Yi SUN. COMPRESSION TESTS OF CONCRETE-FILLED DOUBLE CIRCULAR STEEL TUBULAR STUB COLUMNS. The Hong Kong Institute of Steel Construction, December 2018. http://dx.doi.org/10.18057/icass2018.p.083.

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Denis-Courmont, R. Test Vectors for Session Traversal Utilities for NAT (STUN). RFC Editor, April 2010. http://dx.doi.org/10.17487/rfc5769.

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Robertson, David W., and Thomas Trent. Documentation of Muscularly Demanding Job Tasks and Validation of an Occupational Strength Test Battery (STB). Fort Belvoir, VA: Defense Technical Information Center, November 1985. http://dx.doi.org/10.21236/ada162781.

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EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF PEC COMPOSITE COLUMN-STEEL BEAM FRAME WITH WELDED T-STUB STRENGTHENED CONNECTIONS. The Hong Kong Institute of Steel Construction, September 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.5.

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Seismic performance of innovative Partially Encased Composite (PEC) column-steel beam composite frame was investigated, where the connection was strengthened by the welded T-stub. A ½ scale, two-storey, and one bay composite frame specimen was designed and fabricated for the quasi-static test. Through the experimental observation and measurements, the seismic performance were evaluated, including hysteretic characteristic, lateral stiffness, seismic energy dissipation, and ductility. The plastic damage evolution process and ductile failure mode were clarified. The results indicated that the welded T-stud strengthened connection enhanced the integrity of the frame and led to higher seismic strength and larger lateral stiffness. The plastic hinge was observed away from the beam end due to the welded T-stud and the specimen exhibited an approximately completed hysteretic loop. Without significant decreasing of the ultimate bearing capacity, its overall drift, ductility efficient and equivalent viscous damping ratio were 3.63% (push) / 4.07% (pull), 3.21 (push) / 3.70 (pull) and 0.261 respectively. The proposed structure possesses sound deformation, ductility, and energy-dissipation capacity with the desired plastic failure mode induced by the plastic hinges formed in all beam sections near the T-stud end and column section at the bottom, successively. It was demonstrated an ideal ductile energy-dissipation mode of the frame structure.
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