Gotowe bibliografie tematyczne / Tension

Gotowa bibliografia na temat „Tension”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 7 września 2024

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Artykuły w czasopismach na temat "Tension"

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Luo, Huaan, Yinlong Zhu, Haifeng Zhao, Luqiang Ma i Jingjing Zhang. "Simulation Analysis of Equibiaxial Tension Tests for Rubber-like Materials". Polymers 15, nr 17 (27.08.2023): 3561. http://dx.doi.org/10.3390/polym15173561.

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For rubber-like materials, there are three popular methods of equibiaxial tension available: inflation tension, equibiaxial planar tension, and radial tension. However, no studies have addressed the accuracy and comparability of these tests. In this work, we model the tension tests for a hyperelastic electroactive polymer (EAP) membrane material using finite element method (FEM) and investigate their experimental accuracy. This study also analyzes the impact of apparatus structure parameters and specimen dimensions on experimental performances. Additionally, a tensile efficiency is proposed to assess non-uniform deformation in equibiaxial planar tension and radial tension tests. The sample points for calculating deformation in inflation tensions should be taken near the top of the inflated balloon to obtain a more accurate characteristic curve; the deformation simulation range will be constrained by the material model and its parameters within a specific limit (λ ≈ 1.9); if the inflation hole size is halved, the required air pressure must be doubled to maintain equivalent stress and strain values, resulting in a reduction in half in inflation height and decreased accuracy. The equibiaxial planar tension test can enhance uniform deformation and reduce stress errors to as low as 2.1% (at λ = 4) with single-corner-point tension. For circular diaphragm specimens in radial tension tests, increasing the number of cuts and using larger punched holes results in more uniform deformation and less stress error, with a minimum value of 3.83% achieved for a specimen with 24 cuts and a 5 mm punched hole. In terms of tensile efficiency, increasing the number of tensile points in the equibiaxial planar tension test can improve it; under radial tension, increasing the number of cuts and decreasing the diameter of the punched hole on the specimen has a hedging effect. The findings of this study are valuable for accurately evaluating various equibiaxial tension methods and analyzing their precision, as well as providing sound guidance for the effective design of testing apparatus and test plans.
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Hou, Yangqing, Lili Jiang, Baozhong Sun i Bohong Gu. "Strain rate effects of tensile behaviors of 3-D orthogonal woven fabric: Experimental and finite element analyses". Textile Research Journal 83, nr 4 (18.10.2012): 337–54. http://dx.doi.org/10.1177/0040517512461706.

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The tensile behaviors of 3-D woven fabric under high strain-rate states, i.e. tensile impact behaviors, are important for the design of the fabrics and the reinforced composites under impulsive loading. This paper reports the testing and the numerical simulation of the impact tension behaviors of 3-D woven fabric under high strain rates compared with those under quasi-static tension. The tensile behaviors of 3-D orthogonal woven fabric (3DOWF) were investigated using a MTS 810.23 material testing system and a self-designed split Hopkinson tension bar apparatus, under a wide range of strain rates (0.003–2308/s). The tensile stress–strain curves obtained from the quasi-static and high strain rates were used to analyze the rate-sensitivity of 3DOWF tensile behaviors. It was found that both the tensile strength and the failure strain increased with increases in the strain rate. The two-phase tensile stiffness phenomenon of 3DOWF under high strain rates has been observed experimentally. A microstructure model combined with finite element analysis was established to explain the tensile failure mechanisms of 3DOWF under high strain rates. It was found that the fabric architecture influences the stress wave propagation, thus leading to the two-phase tensile stiffness phenomenon in the stress–strain curve under high strain-rate tensions.
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Li, M., R. Wang i M. B. Han. "A Kolsky bar: Tension, tension-tension". Experimental Mechanics 33, nr 1 (marzec 1993): 7–14. http://dx.doi.org/10.1007/bf02322543.

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Petrie, Helen, Fraser Hamilton i Neil King. "Tension? what tension?" ACM SIGCAPH Computers and the Physically Handicapped, nr 76 (czerwiec 2003): 6–7. http://dx.doi.org/10.1145/1036401.1036403.

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Sima, Yu Zhou, i Zhi Cheng Tan. "Pre-Tension Control Technology of Monolayer Cable Net Fixed by Elastic Structure Anchor". Applied Mechanics and Materials 405-408 (wrzesień 2013): 913–16. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.913.

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The elastic structure of the anchor-fixed monolayer cable net generates elastic displacement under pre-tension, so the designed tension of the cable can be consistent after repeated test and it is difficult to control in later construction. For this case, we get causes for elastic displacement based on comprehensive analysis, simulate and analyze it by using displacement compensation tension method to compute all initial tensions once time and guarantee consistent designed tensions after elastic distortion of a cable. We make the construction sequence and record the force and tension of each cable after it is strained in place based on computed initial pre-tension in order to monitor if the distortion is reasonable in tension and guarantee in-place tension in construction once time without repetition.
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Liu, Jie, Gangyuan Jiang, Taoying Liu i Qiao Liang. "The Influence of Loading Rate on Direct and Indirect Tensile Strengths: Laboratory and Numerical Methods". Shock and Vibration 2021 (29.11.2021): 1–17. http://dx.doi.org/10.1155/2021/3797243.

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To investigate different responses of direct and indirect tensile strengths to loading rate, direct and indirect tension tests were performed on sandstone, rust stone, and granite specimens. Typical load curves indicate that a peak tensile stress frequently appears before the second peak stress, used to calculate the tensile strength in indirect tension tests. As expected, increase in the loading rate increases the tensile strength. In addition, the calculated tensile strengths of the indirect tension tests are frequently higher. Interestingly, the increase ratio of the tensile strength with the increase in the loading rate in indirect tension tests is higher. To verify the above results, crack propagation and stress evolution in direct and indirect tension tests were dynamically monitored using PFC 3D. For direct tension tests, specimens fail at the peak tension point, corresponding to the tensile strength. However, for indirect tension tests, minor cracks, composing of continuous microcracks, form before the peak stress and accompany with the decreased slope of the compression curve. At the peak point, tensile stresses significantly concentrate at the crack tips and further cause large-scale crack propagation. In addition, the initiation stress instead of the peak tensile stress is closer to the tensile strength, obtained from the direct tests for the same loading rate.
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Dennerll, T. J., P. Lamoureux, R. E. Buxbaum i S. R. Heidemann. "The cytomechanics of axonal elongation and retraction." Journal of Cell Biology 109, nr 6 (1.12.1989): 3073–83. http://dx.doi.org/10.1083/jcb.109.6.3073.

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Neurites of PC12 and chick dorsal root ganglion neurons behave as viscoelastic solids in response to applied forces. This passive behavior can be modeled with three mechanical elements; a relatively stiff, undamped spring in series with a Voight element composed of a less stiff spring in parallel with a dashpot. In response to applied tensions greater than 100 microdynes, PC12 cells show lengthening behavior distinct from and in addition to the passive viscoelastic response. We interpret this as "towed growth" (Bray, D. 1984. Dev. Biol. 102:379-389) because the neurites can become twice as long without obvious thinning of the neurite and because in two cases neurite tensions fell below original rest tensions, a result that cannot be obtained with passive viscoelastic elements. The rate of towed growth showed a linear dependence of growth rate with applied tensions in 8 of 12 PC12 neurites exposed to applied tension greater than 100 microdynes. Both PC12 and chick sensory neurons showed evidence of retraction when neurite tensions were suddenly diminished. This response was measured as tension recovery after slackening in chick sensory neurites. In 62% of the cases, tension recovery exceeded and sometimes doubled the preexperimental steady-state tension. Our data indicate that this response is active tension generation by the neurite shaft. We conclude that neurite length is regulated by axial tension in both elongation and retraction. Our data suggest a three-way controller: above some tension set point, the neurite is stimulated to elongate. Below some different, lower tension threshold the neurite is stimulated to retract. Between these two tension thresholds, the neurite responds passively as a viscoelastic solid.
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Qian, Ji, Xin Chen, Limin Sun, Guowen Yao i Xu Wang. "Numerical and Experimental Identification of Seven-Wire Strand Tensions Using Scale Energy Entropy Spectra of Ultrasonic Guided Waves". Shock and Vibration 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/6905073.

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Accurate identification of tension in multiwire strands is a key issue to ensure structural safety and durability of prestressed concrete structures, cable-stayed bridges, and hoist elevators. This paper proposes a method to identify strand tensions based on scale energy entropy spectra of ultrasonic guided waves (UGWs). A numerical method was first developed to simulate UGW propagation in a seven-wire strand, employing the wavelet transform to extract UGW time-frequency energy distributions for different loadings. Mode separation and frequency band loss of L(0,1) were then found for increasing tension, and UGW scale energy entropy spectra were extracted to establish a tension identification index. A good linear relationship was found between the proposed identification index and tensile force, and effects of propagation distance and propagation path were analyzed. Finally, UGWs propagation was examined experimentally for a long seven-wire strand to investigate attenuation and long distance propagation. Numerical and experimental results verified that the proposed method not only can effectively identify strand tensions but can also adapt to long distance tests for practical engineering.
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Jang, Yoon-Kwan, Jung-Soo Suh, Gyuho Choi, Sanghyun Ahn, Ki Seok Han, EunHye Kim, Yerim Lee, Xiaoqi Hu, Eunbae Hwang i Tae-Jin Kim. "Abstract 5816: Tensin1 tension sensor reveals novel features associated with actomyosin, focal adhesion dynamics, and mechanosensitivity". Cancer Research 83, nr 7_Supplement (4.04.2023): 5816. http://dx.doi.org/10.1158/1538-7445.am2023-5816.

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Abstract Cellular responses to mechanical stimuli play an imperative role in the regulation of physiological and pathological functions. Unlike other integrin-mediated adhesion proteins, the force transmission mechanism of tensin1 is not well understood. In this study, we describe the development and visualization of a tensin1 tension sensor. A signal from this sensor indicates that tensin1 is under greater tension at peripheral adhesions than at central adhesions, and that it is controlled by actomyosin in fibroblasts. In a bidirectional manner, tension in tensin1 is regulated by focal adhesion kinase (FAK) activity. Our findings demonstrate that tensin1 is capable of sensing the extracellular matrix through alterations in the tension it receives from the extracellular matrix. Furthermore, tensin1 depletion increases the tension of talin1, but the absence of talin1 decreases the tension applied to tensin1. These results indicate that tensin1 is complementary and dependent on the tension received by talin1. Overall, our data, together with the prognosis following tensin1 expression in colorectal and urothelial cancer, elucidate the tension-receiving function of tensin1 and highlight the necessity of tensin1-mediated mechanotransduction studies. Citation Format: Yoon-Kwan Jang, Jung-Soo Suh, Gyuho Choi, Sanghyun Ahn, Ki Seok Han, EunHye Kim, Yerim Lee, Xiaoqi Hu, Eunbae Hwang, Tae-Jin Kim. Tensin1 tension sensor reveals novel features associated with actomyosin, focal adhesion dynamics, and mechanosensitivity [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 5816.
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Mohandhas, Badri R., Navnit Makaram, Tim S. Drew, Weijie Wang, Graham P. Arnold i Rami J. Abboud. "Racquet string tension directly affects force experienced at the elbow: implications for the development of lateral epicondylitis in tennis players". Shoulder & Elbow 8, nr 3 (6.04.2016): 184–91. http://dx.doi.org/10.1177/1758573216640201.

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Background Lateral epicondylitis (LE) occurs in almost half of all tennis players. Racket-string tension is considered to be an important factor influencing the development of LE. No literature yet exists that substantiates how string-tension affects force transmission to the elbow, as implicated in LE development. We establish a quantitative relationship between string-tension and elbow loading, analyzing tennis strokes using rackets with varying string-tensions. Methods Twenty recreational tennis players simulated backhand tennis strokes using three rackets strung at tensions of 200 N, 222 N and 245 N. Accelerometers recorded accelerations at the elbow, wrist and racket handle. Average peak acceleration was determined to correlate string-tension with elbow loading. Results Statistically significant differences ( p < 0.05) were observed when average peak acceleration at the elbow at 200 N string-tension (acceleration of 5.58 m/s2) was compared with that at 222 N tension (acceleration of 6.83 m/s2) and 245 N tension (acceleration of 7.45 m/s2). The 200 N racket induced the least acceleration at the elbow. Conclusions Although parameters determining force transmission to the elbow during a tennis stroke are complex, the present study was able to control these parameters, isolating the effect of string-tension. Lower string-tensions transmit less force to the elbow in backhand strokes. Reducing string-tension should be considered favourably with respect to reducing the risk of developing LE.
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Rozprawy doktorskie na temat "Tension"

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Laverty, Rory. "Surface tension /". Electronic version (PDF), 2007. http://dl.uncw.edu/etd/2007-1/r1/lavertyr/rorylaverty.pdf.

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Bundy, Penny. "Dramatic Tension: Towards an Understanding of 'Tension of Intimacy'". Thesis, Griffith University, 1999. http://hdl.handle.net/10072/366137.

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This thesis documents my attempts (as a playwright, director and process drama worker) to understand 'tension of intimacy'. It focuses on the questions: What is 'tension of intimacy' in drama? How might it be created? Does the experience of 'tension of intimacy' offer the possibility of new knowledge emerging for the participants and spectators of drama? The methodology (articulated in Chapter Two) involves reflective practice. This chapter incorporates discussion of the nature of knowledge claims and the way they might be judged. The need for criteria of openness is asserted. The research plan and the reflective journey are outlined. Problems associated with the approach are discussed. In Chapter Three, the premises informing O'Toole's (1992) naming of different types of dramatic tension are discussed. Ryle's and Koestler's (1975) models of emotional response are briefly outlined. The difference between emotional response to life and art, and claims regarding the roles of conflict and expectation in the creation and experience of dramatic tension are considered. The suggestion that dramatic tension relates to questions of identity, power and control is questioned. The chapter concludes with a discussion of the potential links between the experience of emotional engagement in response to drama and the emergence of changed awareness or understanding. In Chapter Four, I discuss 'the nature of intimacy' drawing in particular on the theory developed by Malone and Malone (1987) who (unlike other theorists discussed) separate the notions of intimacy and closeness and consider the way it might be experienced as people encounter, not just humans, but other aspects of existence including art. The defining characteristics of intimacy are articulated as connection, animation and heightened awareness. The 'qualities of intimacy' are defined as free choice, personal integrity, acceptance, personal surrender, self-responsibility, attentiveness, risk-taking, presence, participation and systemic detachment and playfbl engagement. Chapter Five incorporates reflection on dramatic works and real-life situations. This is followed by Chapter Six where I document several unsuccessfbl attempts to create script driven by a 'tension of intimacy'. I conclude by questioning my earlier assumptions. In Chapter Seven, the labels applied by O'Toole (1992) and Haseman & O'Toole (1986) to a range of different types of dramatic tension are reconsidered. Following this, I conclude that my earlier theoretical assumptions about the creation and naming of tensions: (a) are inadequate to account for the way people respond differently to the same dramatic moment (b) fail to recognise that tension is created through aspects other than narrative and determine that: (a) dramatic tension is not contained in the drama but in the spectators and participants as they experience it (c) every source of contrast is a potential cause of dramatic tension and these can emerge from within and external to the work I conclude that 'tension of intimacy' might be created if the defining characteristics and 'qualities of intimacy' are present in a spectator's or participant's response to the experience of contrast. In Chapter Eight, my focus shifts to consider structural devices which offer the possibility of the 'qualities of intimacy' being experienced in response. Irony; figure- ground contrast; ritual; and devices intended to distance, alienate or prolong perception are discussed. In Chapter Nine my process of working as a writerldirector to group devise the play's action is documented. The resultant play, Umbilical Cords and Metronomes, is included as Chapter Ten. The exegesis contained in Chapter Eleven is informed by participant and spectator interviews as well as my own response to the process and product. In conclusion, I discuss the terms connection, animation and heightened awareness as they apply in the experience of drama. Significant aspects influencing 'tension of intimacy' including playful response, trust, perceptions of integrity and individual 'reading' processes are discussed. The link between risk-taking, heightened awareness and the possible emergence of new knowledge is considered. Chapter Twelve begins with a summary of the study. Constraints and implications are then briefly discussed. The chapter (and thesis) concludes by returning to answer the questions originally posed. In conclusion I claim that 'tension of intimacy' names the experience of spectators or participants when the defining characteristics of intimacy (connection, animation and heightened awareness) characterise their response and is created when they experience: a feeling of invigoration or animation as they respond to a contrast or metaxis between the stage action and their real world existence (and) reduced conscious focus on the stage action and heightened awareness of their response to the juxtaposition (and) challenge, rather than affirmation, of earlier assumptions and beliefs. I conclude that trust, perceptions of integrity in the action (and in personal response to it) and playful engagement are prerequisites for this experience.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Vocational, Technology and Arts Education
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Fields, Kelvin L. "Tension stiffening response of high-strength reinforced concrete tensile members". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0002/MQ35492.pdf.

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VALLEJOS, CASTRO GABRIELA. "A Tension Please". Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-18107.

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This degree work is about the exploration of the stretch in textile materials by using cartridge pleats as a method to create weight and thereby create tension. Through research in materials and stretch fabrics versus heavier woven textiles the work strives for expressions in movement as well as new ways of combining lightness and weight.
Program: Modedesignutbildningen
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Snowdon, Roger J. III. "Tension in Space". Kent State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=kent1461418173.

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Harvey, Judith Angela Felicia. "Bitumen films in tension". Thesis, University of Cambridge, 2000. https://www.repository.cam.ac.uk/handle/1810/251738.

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Gupta, Surendra K. "Parametric splines in tension /". Online version of thesis, 1989. http://hdl.handle.net/1850/10625.

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Thompson, Alice B. "Surface-tension-driven coalescence". Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12522/.

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When fluid droplets coalesce, the flow is initially controlled by a balance between surface tension and viscosity. For low viscosity fluids such as water, the viscous lengthscale is quickly reached, yielding a new balance between surface tension and inertia. Numerical and asymptotic calculations have shown that there is no simply connected solution for the coalescence of inviscid fluid drops surrounded by a void, as large amplitude capillary waves cause the free surface to pinch off. We analyse in detail a linearised version of this free boundary problem. For zero density surrounding fluid, we find asymptotic solutions to the leading order linear problem for small and large contact point displacement. In both cases, this requires the solution of a mixed type boundary value problem via complex variable methods. For the large displacement solution, we match this to a WKB analysis for capillary waves away from the contact point. The composite solution shows that the interface position becomes self intersecting for sufficiently large contact point displacement. We identify a distinguished density ratio for which flows in the coalescing drops and surrounding fluid are equally important in determining the interface shape. We find a large displacement solution to the leading order two-fluid problem with a multiple-scales analysis, using a spectral method to solve the leading order periodic oscillator problem for capillary waves. This is matched to a single-parameter inner problem, which we solve numerically to obtain the correct boundary conditions for the secularity equations. We find that the composite solution for the two-fluid problem is simply connected for arbitrarily large contact-point displacement, and so zero density surrounding fluid is a singular limit.
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Erla, Adamsdóttir Lilý. "Tension Attention! : Dancing Embroidery". Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-12400.

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This Master’s degree project explores the design possibilities of thread tension, to create a transformation in an interactive, 3D embroidered, wooden surface. The aim is to create a playful visual expression on a surface triggered by interaction. The surface is manipulated by embroidery and the embroidery is manipulated by the tension in the thread. Together all parts create a simple mechanism that allows the viewer to sink into a playful loop of a rising and collapsing structure. Dancing embroidery.  The work explores the potential of the thread as a key factor together with interaction to make a transformation of a surface possible. The thread is used both in the function of the surface and at the same time it creates a strong visual expression as it stands out to show its strength and power.
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Griesser, Arthur F. "U(1) string tension". W&M ScholarWorks, 1991. https://scholarworks.wm.edu/etd/1539623802.

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The long distance force between quarks in the U(1) approximation to quantum chromodynamics is calculated on a home made reduced instruction set computer optimized for that purpose. It is found that previous calculations were in error by as much as 85% due to contamination by the Coulomb interaction. The Coulomb constant, measured for the first time in this work, agrees with analytically obtained values.
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Książki na temat "Tension"

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Fernandes Jr., Rubens (Fernandes Júnior), red. Tensao calma: Calm tension. Sao Paulo: Cosac Naify, 2008.

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Ahmed, Kashif Faraz. Tension. Lahore: Takleeqat, 2000.

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Thomas, Osterkorn, i Petzold Andreas, red. Tension. Hamburg: Stern Gruner + Jahr AG & Co., 2002.

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Phillips, Steve. Surface tension. Lewiston, NY: Mellon Poetry Press, 1996.

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London), International Oleg Kerensky Memorial Conference (1st 1988. Tension structures. [London]: Institution of Structural Engineers, 1988.

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Saul, Anne-Marie. Surface tension. Dublin: University College Dublin, 2002.

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Franceschi, Marisa De. Surface tension. Toronto: Guernica, 1994.

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Knowles, Rachelle Viader. Surface/tension. Windsor, Ont: Art Gallery of Windsor, 1998.

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Aguet, M. Haute tension. Wyd. 2. Lausanne: Presses polytechniques et universitaires romandes, 1990.

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Kling, Christine. Surface tension. Waterville, Me: Thorndike Press, 2003.

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Części książek na temat "Tension"

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Renwick, Robin. "Tension". W Unconventional Diplomacy in Southern Africa, 78–87. London: Palgrave Macmillan UK, 1997. http://dx.doi.org/10.1007/978-1-349-25399-9_10.

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Bhaduri, Amit. "Tension". W Mechanical Properties and Working of Metals and Alloys, 3–94. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7209-3_1.

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Heller, Lois Jane, Celette Sugg Skinner, A. Janet Tomiyama, Elissa S. Epel, Peter A. Hall, Julia Allan, Lara LaCaille i in. "Tension". W Encyclopedia of Behavioral Medicine, 1963. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4419-1005-9_101767.

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Janssen, Jules J. A. "Tension". W Mechanical Properties of Bamboo, 102–11. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3236-7_9.

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Brown, Roger. "Tension". W Physical Test Methods for Elastomers, 137–54. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66727-0_10.

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Mercado, Gustavo. "tension". W The Filmmaker's Eye: The Language of the Lens, 112–13. London; New York: Routledge, 2019.: Routledge, 2019. http://dx.doi.org/10.4324/9780429446894-34.

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Seward, Derek. "Tension". W Understanding Structures, 115–31. London: Macmillan Education UK, 1998. http://dx.doi.org/10.1007/978-1-349-14809-7_6.

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Seward, Derek. "Tension". W Understanding Structures, 103–17. London: Macmillan Education UK, 1994. http://dx.doi.org/10.1007/978-1-349-12083-3_6.

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Stonorov, Tolya. "Tension". W FABRIC[ated], 196–256. New York: Routledge, 2023. http://dx.doi.org/10.4324/9781003138471-24.

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Cioffi, William G., Michael D. Connolly, Charles A. Adams, Mechem C. Crawford, Aaron Richman, William H. Shoff, Catherine T. Shoff i in. "Tension Pneumothorax". W Encyclopedia of Intensive Care Medicine, 2193–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-00418-6_470.

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Streszczenia konferencji na temat "Tension"

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Petrie, Helen, Fraser Hamilton i Neil King. "Tension, what tension?" W the international cross-disciplinary workshop. New York, New York, USA: ACM Press, 2004. http://dx.doi.org/10.1145/990657.990660.

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Zhang, Hanqing, i Ruxin Song. "Theoretical Prediction of Tension-Stroke Relationship of Hydro-Pneumatic Tension Systems". W ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-84071.

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Hydro-pneumatic tension systems have been widely used to support production and drilling risers on floating production systems (such as Spars and TLPs). A hydro-pneumatic tension system utilizes several hydro-pneumatic piston-cylinders (typically four) filled with a working gas (such as nitrogen) to provide the riser it supports with a tension. When the riser experiences strokes with respect to its supporting vessel caused by vessel motion (e.g. due to environmental change), the tensioner will accommodate most of the strokes by changing the volume and pressure of the cylinders. The riser tension will accordingly fluctuate with the pressure change about its design value. Such tension variation directly affects riser design and the vessel’s performance. Therefore, in the design of a hydro-pneumatic tension system, the stiffness of the tensioner, which describes the tension and stroke relationship of the tensioner, is one of the key design parameters to be concerned of. Since it is difficult to perform full-scale tests to determine the relationship for a tensioner, a theoretical model, which considers the tension’s stroke motion as a polytropic process, has been used to simulate the tension-stroke behavior of the tensioners. A polytropic process is well defined by a single parameter, the exponent. For nitrogen as the working gas, an exponent of 1.1 to 1.3 has been adopted in the offshore industry without theoretical or experimental verification. The objective of this study is to theoretically predict the pressure-stroke relationship of the hydro-pneumatic tension systems and to determine proper values of the exponent for the polytropic process used in the offshore industry. The study uses the first law of thermodynamics and the knowledge of heat transfer to predict status change of the working gas with piston stroke and then to calculate the pressure-stroke relationship of the tensioner. The status of the gas is determined from the work exchange induced by piston strokes and heat transfer through the outer surfaces of piston rods and cylinder barrels. As a numerical example, a tension system similar to those used in the Gulf of Mexico is analyzed for 100-year hurricane environments. The predicted pressure time traces are compared with those given by a polytropic process with a series of exponents (or gas constants). The comparisons show that an exponent of 1.3 or 1.4 is a proper value for the polytropic process.
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Wu, Peng, Aixia Wang i Jingjiao Li. "Smart Embed Tension Tensor Based on Internet". W 2007 Third International Conference on Intelligent Information Hiding and Multimedia Signal Processing. IEEE, 2007. http://dx.doi.org/10.1109/iih-msp.2007.282.

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Gallagher, Conor, Dara Williams i Donogh Lang. "Modelling of Marine Riser Tensioner Load Variations and Implications for Minimum Top Tension Settings in Drilling Risers". W ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83753.

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As the pace of deepwater oil and gas exploration continues to grow, so too does demand for modern drilling vessels with equipment capable of operating in water depths of 10,000ft or greater. These greater water depths place significant demands on the drilling riser and the riser tensioning system. Modern riser tensioners are complex hydro-pneumatic systems and far from applying a constant top tension, the stiffness and damping characteristics associated with the tensioner mean that the applied tension can vary substantially as the tensioner strokes in response to vessel heave. As a result it is critical that the riser tensioner system response be captured in sufficient detail when evaluating the loads on the drilling riser. Riser tensioner systems for deepwater drilling must be capable of supplying the required tension to satisfy the minimum stability tension requirement, as per API RP 16Q; however this recommended practice does not adequately account for dynamic tensioner load variation, which can be up to 50% of the nominal tension. For deepwater drilling riser systems, where riser load limits are being approached, accurate modeling of the tensioner system load variation is required to ensure that the riser does not experience compression or excessive stresses. Furthermore, as the dynamic tension variations are largely velocity dependent, they can be relatively independent of water depth. Thus larger percentage variations in tension are experienced at low tensions when compared to higher tensions. This is an important consideration when calculating minimum top tensions for deepwater drilling rigs in shallower water depths. This paper presents a comparison of the response of a direct-acting riser tensioner (DAT) system for a range of environments. The comparison is based on results from detailed tensioner models that include the individual hydraulic and pneumatic components of the tensioner system and that are fully integrated with a non-linear 3D structural FE analysis tool [1]. The FE model is based on a widely-validated-non-linear software tool [3]. The detailed tensioner model has been validated against manufacturer performance data for existing in-service tensioner systems. The detailed tensioner model has also been used as part of a drilling riser recoil analysis study [1] which provided a good comparison of recoil analysis results against a published recoil test case. The impact on the global riser response of accurately modeling the tensioner system behavior is demonstrated, while the implications for the calculation of minimum top tension are also discussed.
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Read, David T. "Tension-Tension Fatigue of Copper Thin Films". W ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0732.

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Abstract Tension-tension, load-controlled fatigue results extending to over 100,000 cycles for electron-beam-evaporated copper are reported. The specimen is fabricated as a single tensile coupon with hundreds of grains across the width but one or few through the thickness, supported on a silicon frame. These specimens had measured values of Young’s modulus lower than bulk polycrystalline values, but had high values of the yield and ultimate strengths. Closed-loop feedback control of the piezoelectric actuators allowed load-controlled fatigue tests with a cycle duration of 15 s. Stress-endurance results for this set of copper films are reported and compared to previous results.
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Plant, Nicola, i Patrick G. T. Healey. "Surface tension". W CHI '13 Extended Abstracts on Human Factors in Computing Systems. New York, New York, USA: ACM Press, 2013. http://dx.doi.org/10.1145/2468356.2479589.

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Bhaskara Rao, D. S., R. Panneer Selvam i Nagan Srinivasan. "Hydrodynamic Analysis of Tension Based Tension Leg Platform". W ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83256.

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Tension Leg Platforms (TLPs) are one of the best options for offshore industry in deep waters due to proven motion response characteristics. These are water depth sensitive structures and the motion responses in vertical plane motions (heave, roll and pitch) are critical for a TLP. Tension Based TLP (TBTLP) is a new concept and finds application in much deeper waters. A provision of a tension base at mid-depth results in an economical design of TLP. In fact, the TLP installed at a certain depth without any modifications can be made to be deployed in much deeper water depths by means of a tension base. In this paper, the concept of TBTLP is highlighted and hydrodynamic analysis of the chosen platform has been carried out using ANSYS AQWA package. The motion responses in terms of Response Amplitude Operators (RAOs) of TBTLP with one Tension Base in surge, heave and pitch have been obtained and compared with a TLP without a tension base.
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FAZLALI, BABAK, STEPAN V. LOMOV i YENTL SWOLFS. "ACCURATE TENSION-TENSION FATIGUE TESTING OF UNIDIRECTIONAL COMPOSITES". W Proceedings for the American Society for Composites-Thirty Eighth Technical Conference. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/asc38/36713.

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The fatigue behavior of composites is generally described by the S-N curve of unidirectional (UD) composites. However, obtaining reliable fatigue data hinges on a test method that guarantees uniform stress distribution over the gauge section. The standard methods introduce stress concentrations close to the end tab edge and hence lead to premature failure. To find the method yielding the highest fatigue life, the current work examines different specimen configurations. The standards and two well-known configurations as well as a novel arrow-shape one are studied. The standard configuration, rectangular specimens with rectangular and tapered end tabs, yielded the highest fatigue life. Moreover, the effect of the test setup on fatigue life is investigated. The results show a considerable effect of specimen configuration and test setup on the fatigue life of UD composites. The results of this study assist reliable fatigue tests.
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Zhang, Hanqing, i Derek Smith. "Interference of Top Tensioned Risers for Tension Leg Platforms". W ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61334.

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Dry tree top-tensioned risers (TTRs) are widely used on floating production systems such as TLPs and Spars for drilling, completion, workover and production. The interference between neighboring TTRs is an important consideration which has a direct impact on the total TTR payload budget and the wellbay size for floater sizing and cost. Since the realistic sizing of a floater is essential towards the concept selection process for a field development, TTR interference should be addressed at the early stages of an offshore oilfield development. If the floater is a tension leg platform (TLP) and the field has strong current with associated extreme waves, riser interference may be very challenging and can have direct impact on riser design and the sizing and layout of the TLP. The waves and the oscillating motions of the TLP will have effects on riser interference. The oscillating motion of the TLP can excite the vibrational motion of the risers, and the wave-induced velocity of water particles and the motions of the risers with the movement of the TLP increases the relative flow acting on each riser. The combined effects will increase the deflection of the risers and thus the likelihood of riser interference. The industry has not seen an acceptable interference analysis approach yet which can account for the combined effects of current, waves, and TLP motions. This paper proposes two engineering approaches for the interference analysis of top tensioned risers for tension leg platforms with the combined effects of current, surface waves, and associated floater motions being addressed.
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Weller, S. D., P. Halswell, L. Johanning, T. Kosaka, H. Nakatsuka i I. Yamamoto. "Tension-Tension Testing of a Novel Mooring Rope Construction". W ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61915.

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Synthetic fibre ropes are in widespread use in maritime applications ranging from lifting to temporary and permanent mooring systems for vessels, offshore equipment and platforms. The selection of synthetic ropes over conventional steel components is motivated by several key advantages including selectable axial stiffness, energy absorption (and hence load mitigation), fatigue resistance and low unit cost. The long-term use of ropes as safety critical components in potentially high dynamic loading environments necessitates that new designs are verified using stringent qualification procedures. The International Organization for Standardization (ISO) is one certification body that has produced several guidelines for the testing of synthetic ropes encompassing quasi-static and dynamic loading as well as fatigue cycling. This paper presents the results of tension-tension tests carried out to ISO 2307:2010, ISO 18692:2007(E) and ISO/TS 19336:2015(E) on three different 12-strand rope constructions manufactured by Ashimori Industry Co. Ltd from polyester and Vectran® fibres. The purpose of the tests was to characterise the performance of a novel 12-strand construction and compare this to a conventional 12-strand construction. Utilising the Dynamic Marine Component test facility (DMaC) at the University of Exeter several key performance metrics were determined including; elongation, minimum break load (MBL) and quasi-static and dynamic stiffness. During the ISO 2307:2010(E) test programme the samples were tested dry and during the ISO 18692:2007(E) and ISO/TS 19336:2015(E) test programmes the samples were fully submerged in tap water after being soaked for at least 24 hours. Two methods were used to quantify sample extension: i) an optical tracking system and ii) a draw-wire potentiometer. Axial compression fatigue and cyclic loading endurance tests were also carried out on two Vectran® samples. Further load-to-failure tests and sample analysis were also carried out by Ashimori Industry Co. Ltd. It was found that the MBL of the samples exceeded the values specified by the manufacturer (by 7.7–29.5% for the polyester samples) with failure occurring at the splices in all cases and minor abrasion noted in several locations. The measured MBL of the novel polyester Straight Strand Rope (SSR) construction was up to 16% higher than the conventional construction with increases of quasi-static and dynamic stiffness of up to 6.8%. Differences between the viscoelastic and viscoplastic behaviour of the samples were also noted. The data obtained during these tests will provide insight into the behaviour of these materials and different rope constructions which will be of use to rope manufacturers, mooring system designers in addition to offshore equipment and vessel operators.
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Raporty organizacyjne na temat "Tension"

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Silverstein, Eva M. Tension is Dimension. Office of Scientific and Technical Information (OSTI), wrzesień 1999. http://dx.doi.org/10.2172/15068.

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Yuri Shane. CABLE PULLING TENSION. Office of Scientific and Technical Information (OSTI), lipiec 1995. http://dx.doi.org/10.2172/875322.

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McInerney, Michael, Matthew Brenner, Sean Morefield, Robert Weber i John Carlyle. Acoustic nondestructive testing and measurement of tension for steel reinforcing members. Engineer Research and Development Center (U.S.), październik 2021. http://dx.doi.org/10.21079/11681/42181.

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Many concrete structures contain internal post-tensioned steel structural members that are subject to fracturing and corrosion. The major problem with conventional tension measurement techniques is that they use indirect and non-quantitative methods to determine whether there has been a loss of tension. This work developed an acoustics-based technology and method for making quantitative tension measurements of an embedded, tensioned steel member. The theory and model were verified in the laboratory using a variety of steel rods as test specimens. Field tests of the method were conducted at three Corps of Engineers dams. Measurements of the longitudinal and shear velocity were done on rods up to 50 ft long. Not all rods of this length were able to be measured and the quality and consistency of the signal varied. There were fewer problems measuring the longitudinal velocity than shear velocity. While the tension predictions worked in the laboratory tests, the tension could not be accurately calculated for any of the field sites because researchers could not obtain the longitudinal or shear velocities in an unstressed state, or precise measurements of the longitudinal and shear velocities due to the unknown precise length of the rods in the tensioned state.
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Marr, Phebe A. Iraq: Troubles and Tension. Fort Belvoir, VA: Defense Technical Information Center, lipiec 1997. http://dx.doi.org/10.21236/ada385963.

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Leslie, Jean, Andy Loignon, Cristopher Lane, Sarah Haber Pixley i Adam Brinegar. 3 Tensions Leaders Should Resolve in 2023. Center for Creative Leadership, kwiecień 2023. http://dx.doi.org/10.35613/ccl.2023.2053.

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Through surveys of over 43,000 leaders, ExecOnline and the Center for Creative Leadership (CCL) identified three key tensions that organizations must address to enable leaders to lead effectively in the current environment. This paper discusses these tensions and offers insights to address them. Tension 1: Leaders want to work virtually–but it’s socially isolating. Tension 2: Leaders want more development opportunities–but they are burned out. Tension 3: Leaders need to make hard decisions–but they also need to motivate and engage talent. The insights gained from this paper suggest that leaders and organizations take action in the following ways: Offer more cross-functional opportunities as well as foster connections within teams, including through group coaching. Provide development opportunities that are easier to access and consume, as well as opportunities for personal growth and development. Target strategic and talent engagement skills for leaders who are already strong on one skill set and reinforce learning by pairing training with one-on-one coaching.
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Jordan, Rachel E., i Jeffrey A. Stark. Capillary Tension in Rotting Ice Layers. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 2001. http://dx.doi.org/10.21236/ada399589.

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Turchi, Patrice A. Viscosity and Surface Tension of Metals. Office of Scientific and Technical Information (OSTI), kwiecień 2018. http://dx.doi.org/10.2172/1438687.

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Sohn, J. E., J. E. Emerson, P. A. Thompson i J. T. Koberstein. Rubber-Modified Epoxies: Interfacial Tension and Morphology. Fort Belvoir, VA: Defense Technical Information Center, luty 1988. http://dx.doi.org/10.21236/ada192464.

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Badcock, C. D., i R. Madhavan. PR-106-521-R02 Pipe Collapse under Combined Axial Tension and External Pressure. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), sierpień 1987. http://dx.doi.org/10.55274/r0011756.

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This report documents the work accomplished during the course of a three year period. The main objective of this study was to investigate the collapse of thick-walled tubes under combined axial tension and pressure. A combined analytic and experimental approach was adopted. The D/t range of interest was 10-40. A number of collapse tests were conducted using small diameter tubing. Careful measurements of geometrical and material parameters were carried out before each collapse test. Tension-pressure collapse envelopes were obtained for tubes of different D/t. Collapse tests involving different loading paths as well as initially ovalized tubes were carried out. Specimen of lower DIt values tested at very high tensile loads showed a lack of collapse failure within the load-displacement capability of the setup.
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Gagliadi, F., S. Pease i B. Cunningham. PBX 9502 Stockpile-Returned Hemi Tension Directionality Study. Office of Scientific and Technical Information (OSTI), luty 2015. http://dx.doi.org/10.2172/1251095.

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