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Relevant bibliographies by topics / Flexure

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Academic literature on the topic 'Flexure'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 March 2023

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Journal articles on the topic "Flexure"

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Sollpaur, Shrishail B., Maharudra S. Patil, and Suhas P. Deshmukh. "Evaluation of Stiffness and Parametric Modelling of XY Flexure Mechanism for Precision Applications." Journal of Modeling and Simulation of Materials 1, no. 1 (May 31, 2018): 8–15. http://dx.doi.org/10.21467/jmsm.1.1.8-15.

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In miniaturized scale electro-mechanical framework (MEMS) flexural instruments are generally utilized in light of their preferences, frictionless and wear less movement and high accuracy. Flexures rely upon material versatility for their usefulness. In flexure component, movement is created because of flexibility of the shaft from which it is made. One of the run of the mill favorable circumstances of flexural system is to increase exact twisting and adaptability to acquire movement wanted way. This paper manages outline, examination and displaying of XY flexure instrument which depends on twofold parallelogram flexure (DFM). The XY system exhibited has solid structure and it depends on twofold parallelogram flexure. Limited component model and investigation is completed in ANSYS 15. Static examination is done to discover constrain avoidance attributes of instrument. Parametric examination is utilized to improve outline parameters of flexure shaft. Limited component examination (FEA) result approves investigative outcomes of component.

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Roopa, R., P. Navin Karanth, and S. M. Kulkarni. "Design, fabrication and experimental studies of compliant flexure diaphragm for micro pump." International Journal of Engineering & Technology 7, no. 2.21 (April 20, 2018): 66. http://dx.doi.org/10.14419/ijet.v7i2.21.11838.

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This study reports the performance of piezo actuated compliant flexure diaphragm for micropump and MEMS application. To achieve the high performance of diaphragm at the low operating voltage compliant flexure diaphragm design is introduced. Very limited work has done on the diaphragms of micropump. Large numbers of mechanical micropumps have used plane diaphragms. The central deflection of diaphragm plays an important role in defining the micropump performance. The flow rate of mechanical type micropump strongly depends on the central deflection of diaphragm. In this paper compliant flexure diaphragms are designed for micropump to achieve higher deflection at lower operating voltage. Finite element analysis of compliant flexure diaphragm with single layer PVDF (Polyvinylidene fluoride) actuator is simulated in COMSOL. Compliant flexure diaphragms with a different number of flexures are analyzed. The central deflection of compliant flexure diaphragms is measured for driving voltages of 90V to 140V in 10 steps. The deflection of the compliant flexure diaphragm mainly depends on flexure width and length, the number of flexures in the diaphragm, PVDF thickness, diaphragm thickness and driving voltage. Use of compliant flexure diaphragm for micropump will reduce the mass and driving voltage of micropump. An attempt is made to compare the results of compliant flexure diaphragms with plane diaphragms. From the experimental results it is noticed that the compliant flexure diaphragm deflection is twice that of the plane diaphragm at same driving voltage. Deflection of three flexure and four flexure compliant diaphragms is 10.5µm and 11.5µm respectively at 140V.

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Lobontiu, Nicolae, Jeffrey S. N. Paine, Ephrahim Garcia, and Michael Goldfarb. "Corner-Filleted Flexure Hinges." Journal of Mechanical Design 123, no. 3 (October 1, 2000): 346–52. http://dx.doi.org/10.1115/1.1372190.

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The paper presents an analytical approach to corner-filleted flexure hinges. Closed- form solutions are derived for the in-plane compliance factors. It is demonstrated that the corner-filleted flexure hinge spans a domain delimited by the simple beam and the right circular flexure hinge. A comparison that is made with the right circular flexure hinges indicates that the corner-filleted flexures are more bending-compliant and induce lower stresses but are less precise in rotation. The finite element simulation and experimental results confirmed the model predictions.

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Taylor, Stephen J., Alex Manara, Jules Brown, Kaylee Allan, Rowan Clemente, and Deirdre Toher. "Cortrak feeding tube placement: interpretation agreement of the ‘GI flexure’ system versus X-ray." British Journal of Nursing 29, no. 12 (June 25, 2020): 662–68. http://dx.doi.org/10.12968/bjon.2020.29.12.662.

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Background: Blind (unguided) feeding tube placement results in 0.5% of patients suffering major complications mainly due to lung misplacement detected prior to feeding. Electromagnet-guided (Cortrak) tube placement could pre-empt such complications but undetected misplacements still occur due to incorrect trace interpretation. By identifying gastrointestinal (GI) flexures from the trace, ‘the GI flexure system’, it has been proposed that tube position can be interpreted. Aims: To audit agreement between standards of interpreting tube position: the Cortrak ‘GI flexure’ system versus X-ray. Methods: In 185 primary nasointestinal tube placements tube position determined by Cortrak trace interpretation (GI flexure) was retrospectively compared with radiological position in a blinded study. Findings: Radiological and Cortrak interpretation agreed in 92.2–98.3% of placements at different GI flexures. Discrepancy mainly occurred because some radiological images were unclear or did not cover all anatomical points. Conclusion: The GI flexure method of Cortrak interpretation appears safe but would necessitate prospective radiological investigation to definitively test equivalence.

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Taylor, Stephen, Alex Manara, Jules Brown, Kaylee Sayer, Rowan Clemente, and Deirdre Toher. "Cortrak feeding tube placement: accuracy of the ‘GI flexure system’ versus manufacturer guidance." British Journal of Nursing 29, no. 21 (November 26, 2020): 1277–81. http://dx.doi.org/10.12968/bjon.2020.29.21.1277.

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Electromagnetic (EM) guided enteral tube placement may reduce lung misplacement to almost zero in expert centres, but more than 60 undetected misplacements had occurred by 2016 resulting in major morbidity or death. Aim: Determine the accuracy of manufacturer guidance in trace interpretation against what is referred to as the ‘GI flexure system’. Methods: The authors prospectively observed the accuracy of the ‘GI flexure system’ of trace interpretation against manufacturer guidance in primary nasointestinal (NI) tube placements. Findings: Contrary to manufacturer guidance, 33% of traces deviated >5 cm from the sagittal midline and 26.5% were oesophageal when entering the lower left quadrant, incorrectly indicating lung and gastric placement, respectively. Conversely, the GI flexure system identified ≥99.4% of GI traces when they reached the gastric body flexure; 100% at the superior duodenal flexure. All lung misplacements were identified by the absence of GI flexures. Conclusion: Current manufacturer guidance should be updated to the GI flexure system of interpretation.

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Grippo, John O. "Tooth Flexure." Journal of the American Dental Association 122, no. 7 (July 1991): 13. http://dx.doi.org/10.14219/jada.archive.1991.0226.

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Hopkins, J. B. "Designing hybrid flexure systems and elements using Freedom and Constraint Topologies." Mechanical Sciences 4, no. 2 (October 1, 2013): 319–31. http://dx.doi.org/10.5194/ms-4-319-2013.

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Abstract. In this paper we introduce the principles necessary to synthesize hybrid flexure systems and elements. Flexure systems consist of rigid bodies that are joined together by flexure elements that elastically deform to guide the system's rigid bodies with desired degrees of freedom (DOFs). The principles introduced here for synthesizing hybrid flexure systems and elements are extensions of the Freedom and Constraint Topologies (FACT) synthesis approach. FACT utilizes a comprehensive library of geometric shapes from which designers can rapidly consider and compare a multiplicity of flexure concepts that achieve any desired set of DOFs. Prior to this paper, designers primarily used these shapes to synthesize parallel and serial flexure systems and elements. With this paper, designers may now use these same shapes to synthesize more general flexures that consist of various combinations of parallel and serial systems and elements (i.e., hybrid configurations). As such, designers can access a larger body of flexure solutions that satisfy demanding design requirements. Instructions for helping designers utilize or avoid the advantages and challenges of over-, under-, and exact-constraint are also provided. Hybrid systems and elements are analysed and designed as case studies.

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Nanni, Antonio, and Michael S. Norris. "FRP jacketed concrete under flexure and combined flexure-compression." Construction and Building Materials 9, no. 5 (October 1995): 273–81. http://dx.doi.org/10.1016/0950-0618(95)00021-7.

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Panas, Robert M., Frederick Sun, Logan Bekker, and Jonathan B. Hopkins. "Combining cross-pivot flexures to generate improved kinematically equivalent flexure systems." Precision Engineering 72 (November 2021): 237–49. http://dx.doi.org/10.1016/j.precisioneng.2021.05.001.

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Henein, S. "Short Communication: Flexure delicacies." Mechanical Sciences 3, no. 1 (January 13, 2012): 1–4. http://dx.doi.org/10.5194/ms-3-1-2012.

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Abstract. Flexures are nowadays enjoying a new boom in numerous high-precision and extreme-environment applications. The paper presents some delicate issues concerning stiffness compensation, large reduction ratios, as well as rectilinear and circular movements in compliant mechanisms. Novel concrete technical solutions to these well-known issues are described, giving a glimpse into the vast and still largely unexploited potential of flexure mechanisms manufactured by wire-electrical-discharge machining.

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Dissertations / Theses on the topic "Flexure"

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Vasquez, Daniel James. "Flexure-based nanomagnetic actuators." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1383481101&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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Gojuri, Arun. "Stability of End Notched Flexure Specimen." Thesis, Högskolan i Skövde, Institutionen för teknik och samhälle, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-4487.

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This paper deals with two-dimensional Finite Element Analysis of the End Notched Flexure (ENF) specimen. The specimen is known to be unstable if the crack length is shorter than some critical crack length acr. A geometric linear two-dimensional Finite Element (FE) analysis of the ENF specimen is performed to evaluate acr for isotropic and orthotropic elastic materials, respectively. Moreover, the Mode II Energy Release Rate (ERR) JII and the compliance of the specimen are calculated. The influence of anisotropy is studied. Comparisons are made with the results from beam theory. This work is an extension of previous work.

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Bildsten, Erika Margit. "Analysis of novel flexure-based joint." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74423.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 53).
As robots and other actuated mechanisms get smaller, so must their moving parts. A novel flexure-based joint was developed for Squishbot1 by a team at MIT, which can be made small (sub-cm), or much larger. Here, pseudo-rigid-body modeling is used in conjunction with the geometry of the joint mechanism in order to create analytic models of the forces at play in the joint, so as to better enable their design and use. Two mechanisms are analyzed: one in which the flexure is pinned to the moving legs, and one in which it is fixed. Systems of equations are generated for fixed flexure and pinned flexure joints, which are provided for the reader to use in order to develop their own mechanisms, and optimize them to their own applications. The fixed flexure, no leg contact model is tested for a particular configuration, and less than 3% error is found between the experimental and model data. The advancement of small (sub-cm) actuated mechanisms will push forward the development of small robots, and expand the terrains and applications in which robots can work.
by Erika Margit Bildsten.
S.B.

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Barnett, D. N. "Convection, elasticity and flexure inside terrestrial planets." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596394.

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In this dissertation, the large-scale geophysical behaviour of the Earth, Venus and Mars are compared, using data collected by the Magellan spaceprobe (for Venus) and the Viking and Mars Global Surveyor (MGS) probes (for Mars). Neither Venus nor Mars show evidence of plate tectonics operating at the present day. On Venus, the lack of water means the frictional resistance at faults and the viscous drag on the base of the moving lithospheric plates are too high to be overcome by the driving forces for plate tectonics. The high elastic thickness of Mars results in a large frictional resistance to fault motion, although the faults themselves are probably no stronger than those on the Earth, and means large compressive stresses are required to initiate subduction. The likely high viscosity of the martian mantle, a consequence of its probable dryness and low temperature, may also result in large drag forces on the base of the lithosphere. Plate tectonics may have operated in the past on both planets, providing a possible explanation for the rapid resurfacing of Venus required by the crater counts and the linear magnetic anomalies recently discovered on Mars.

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Chen, Jay-San. "Standardisation of flexure testing of engineering ceramics." Thesis, University of Warwick, 2000. http://wrap.warwick.ac.uk/67042/.

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With the increase in usage of engineering ceramics, a new industrial standard is required in order to evaluate its properties and to perform a fair and just trade. The thesis investigates the faults and omissions of existing work and judges today's requirements thereby constructing a framework with which today's and future standards in flexure testing can be based. The draft standard presented in this thesis covers the three major testing methods for determining the biaxial flexural strength (modulus of rupture) of engineering ceramics. The ring-on-ring, ball-on-ring, and 4-Ball test fixtures were all adopted as standard, since it is known that each of these systems is suited for a particular application and each has different advantages and disadvantages. The three major biaxial test methods prescribed in this draft standard have been devised so that more consistent and accurate test results can be obtained. However, the uncertainty of measurement in flexure testing always exists and needs to be estimated. The estimation of uncertainty in flexure testing in this study is based on the methodology provided in the ISO Guide to the expression of uncertainty in measurement. The results of the estimation showed that the uncertainty in measurement for the biaxial flexure test standard proposed in this thesis is very low compared to the inherent variability of the strength of ceramic materials. It was also found that the applied load, thickness of the disc plate, and random effects are the three major components contributing to the overall uncertainty. The total uncertainty of measurement in biaxial flexure testing can be significantly minimised by the reduction of the uncertainty contributed from these components, especially from random effects.

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D'Arrigo, Paolo. "Control of flexure in large astronomical spectographs." Thesis, University College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244064.

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Bry, Madeleine. "Flexure of the lithosphere at foreland basins." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439115.

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Hunter, Johnny. "Flexure and rheology of Pacific oceanic lithosphere." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:fee30488-1a30-48ae-b47e-b6dbc4e3d4d6.

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The idea of a rigid lithosphere that supports loads through flexural isostasy was first postulated in the late 19th century. Since then, there has been much effort to investigate the spatial and temporal variation of the lithosphere's flexural rigidity, and to understand how these variations are linked to its rheology. In this thesis, flexural modelling is used to first re-assess the variation in the rigidity of oceanic lithosphere with its age at the time of loading, and then to constrain mantle rheology by testing the predictions of laboratory-derived flow laws. A broken elastic plate model was used to model trench-normal, ensemble-averaged profiles of satellite-derived gravity at the trench-outer rise system of circum-Pacific subduction zones, where an inverse procedure was used to find the best-fit Te and loading conditions. The results show a first-order increase in Te with plate age, which is best fit by the depth to the 400 ± 35 °C plate-cooling isotherm. Fits to the observed gravity are significantly improved by an elastic plate that weakens landward of the outer rise, which suggests that bending-induced plate weakening is a ubiquitous feature of circum-Pacific subduction zones. Two methods were used to constrain mantle rheology. In the first, the Te derived by modelling flexural observations was compared to the Te predicted by laboratory-derived yield strength envelopes. In the second, flexural observations were modelled using elastic-plastic plates with laboratory-derived, depth-dependent yield strength. The results show that flow laws for low-temperature plasticity of dry olivine provide a good fit to the observations at circum-Pacific subduction zones, but are much too strong to fit observations of flexure in the Hawaiian Islands region. We suggest that this discrepancy can be explained by differences in the timescale of loading combined with moderate thermal rejuvenation of the Hawaiian lithosphere.

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Meyyappan, Karumbu Nathan. "Failure prediction of wire bonds due to flexure." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1737.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.
Thesis research directed by: Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Haddad, David. "Lithospheric flexure and the evolution of Australian basins." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302396.

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Books on the topic "Flexure"

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Compliant mechanisms: Design of flexure hinges. Boca Raton: CRC Press, 2003.

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Flexures: Elements of elastic mechanisms. Amsterdam: Gordon & Breach, 2000.

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Chen, Jay-san. Standardisation of flexure testing of engineering ceramics. [s.l.]: typescript, 2000.

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Wang, C. M. Shooting-optimization technique for large deflection analysis of structural members. St. Lucia: University of Queensland, Dept. of Civil Engineering, 1990.

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Flexible and rigid. Oxford: Heinemann Library, 2008.

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G, Nawy Edward, ed. Recent developments in deflection evaluation of concrete. Farmington Hills, Mich. (P.O. Box 9094, Farmington Hills 48333): American Concrete Institute, 1996.

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Wang, C. M. Shooting-optimization technique for large deflection analysis of structural members. St Lucia, Q., Australia: Department of Civil Engineering, The University of Queensland, 1990.

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Deflection of beams for all spans and cross sections. New York: McGraw-Hill, 1985.

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Hendricks, Robert C. Brush seal bristle flexure and hard-rub characteristics. [Washington, DC]: National Aeronautics and Space Administration, 1992.

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Alca, Nedim. Effect of size on flexural behaviour of high-strength concrete beams. Edmonton, Alta: Dept. of Civil Engineering, University of Alberta, 1993.

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Book chapters on the topic "Flexure"

1

Kniery, Kevin R., Michael J. Mulcahy, and Scott R. Steele. "Splenic Flexure." In Laparoscopic Colectomy, 49–63. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39559-9_4.

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Labille, Jérôme, Natalia Pelinovskaya, Céline Botta, Jean-Yves Bottero, Armand Masion, Dilip S. Joag, Richard G. Forbes, et al. "Flexure Mechanisms." In Encyclopedia of Nanotechnology, 865. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_100253.

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Dolan, Charles W., and H. R. Hamilton. "Flexure: Design." In Prestressed Concrete, 139–68. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97882-6_6.

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Wong, T. E., R. B. Pan, H. D. Marten, C. Sve, L. Galvan, and T. S. Wall. "Spiral Flexure Bearing." In Cryocoolers 8, 305–11. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-9888-3_30.

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Gooch, Jan W. "Modulus in Flexure." In Encyclopedic Dictionary of Polymers, 467. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7587.

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Brown, Roger. "Shear and Flexure." In Physical Test Methods for Elastomers, 161–65. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66727-0_12.

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Setareh, Mehdi, and Robert Darvas. "Special Topics in Flexure." In Concrete Structures, 151–233. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-24115-9_3.

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Fernandez, Carmen Cagigas, Marcos Gómez Ruiz, Lidia Cristobal Poch, and Natalia Suarez Pazos. "Robotic Splenic Flexure Mobilization." In Robotic Colorectal Surgery, 191–204. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15198-9_17.

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Kirby, Jonathan. "Isostasy, Flexure and Strength." In Spectral Methods for the Estimation of the Effective Elastic Thickness of the Lithosphere, 3–34. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-10861-7_1.

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Fanella, David A., Rene Amon, Bruce Knobloch, and Atanu Mazumder. "Members under Flexure: 1." In Steel Design for Engineers and Architects, 39–92. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-9729-2_2.

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Conference papers on the topic "Flexure"

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Meng, Qiaoling, Giovanni Berselli, Rocco Vertechy, and Vincenzo Parenti Castelli. "An Improved Method for Designing Flexure-Based Nonlinear Springs." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70367.

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Monolithic Flexure-based Compliant Mechanisms (MFCM) can functionally act as nonlinear springs by providing a desired load-displacement profile at one point on their structure. Once the MFCM topology is chosen, these particular springs can be conveniently synthesized by resorting to the well-known Pseudo-Rigid-Body approximation, whose accuracy strongly depends on the modeling precision of the flexures’ principal compliance. For various types of flexures, closed-form solutions have been proposed which express the compliance factors as functions of the flexure dimensions. Nonetheless, the reliability of these analytical relations is limited to slender, beam-like, hinges undergoing small deflections. In order to overcome such limitations, this paper provides empirical equations, derived from finite element analysis, that can be used for the optimal design of circular, elliptical, and corner-filleted flexural hinges with general aspect ratios on the basis of both principal compliance and maximum bearable stress. As a case study, a nonlinear spring conceived as a four-bar linkage MFCM is synthesized and simulated by means of finite element analysis. Numerical results confirm that the aforementioned empirical equations outperform their analytical counterparts when modeling thick cross-section hinges undergoing large deflections.

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Su, Hai-Jun, Hongliang Shi, and JingJun Yu. "Analytical Compliance Analysis and Synthesis of Flexure Mechanisms." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48013.

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This paper presents a symbolic formulation for analytical compliance analysis and synthesis of flexure mechanisms with arbitrary topologies. Compliance analysis or mapping is to determine the relationship between the deformation of a mechanism and the external loading applied. It is a crucial step for the control and design of flexure mechanisms. Most of the current work relies on physical experiments or numerical simulations for studying the compliance or stiffness of flexure mechanisms. There is a lack of formal tools for the compliance synthesis whose goal is to determine the geometry of flexures or assembly of multiple flexures for a prescribed compliance in the motion direction of interest. In this work, we first derive a symbolic formulation of the compliance and stiffness matrices for commonly-used flexure elements, flexure joints and simple chains. Elements of these matrices are all explicit functions of flexure parameters. To analyze a complex flexure mechanism, we subdivide the mechanism into multiple structural modules which we identify as serial, parallel or hybrid chains. We then analyze each module with the known flexure structures in the library. At last we use a bottom-up approach to obtain the compliance matrix for the overall mechanism. Our symbolic formulation enables subsequent compliance synthesis or sensitivity analysis which is to determine how each flexure parameter affects the overall compliance of the mechanism. Four practical examples are provided to demonstrate the approach. The result is a robust design method for the compliance analysis and synthesis of flexure mechanisms.

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Qiu, Songgang, Bozhi Yang, and Ross Galbraith. "Novel Flexure Design for a High-Temperature Thermal Storage Vessel Coupled to a Free-Piston Stirling Engine." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38943.

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This paper presents the design and simulation of a novel flexure structure to potentially support a thermal energy storage (TES) salt vessel that is mounted on a solar dish Stirling Engine. During operation, the TES vessel expands significantly due to the elevated salt temperature leading to large deformation (thus high thermal stress) and large temperature change on the flexures. The flexure design consists of two sets of stacked flexures (∼100 mm in distance), each having eight stacked L-shaped flexures symmetrically distributed around the salt vessel. The axial and circumferential section of each flexure allows the radial and axial vessel expansion respectively. The stacking concept is expected to provide sufficient lateral rigidity (to avoid sag under gravity) while still allows the desired axial flexibility. Super Alloy Inconel 625 is selected as the flexure material due to its desired properties at elevated temperatures. A simplified model and a system model (including flexures, dummy engine, and salt vessel) of the design were analyzed using Finite Element Analysis (FEA). Analysis shows that the design meets the stress, deformation, and fatigues requirements. Test will be conducted to verify the simulation results. The flexure design is compact, simple, and low-cost to fabricate, and the concept can potentially be used for other applications that involve support of structures with large thermal expansion.

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Zhao, Shanshan, Shusheng Bi, Jingjun Yu, Minglei Sun, and Guanghua Zhong. "A Large-Deflection Annulus-Shape Flexure Hinge Based on Curved Beams." In ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49693.

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A curved flexure element such as an initially-curved beam can deflect largely and facilely. Using curved flexure elements in compliant mechanisms allows the mechanism to move a longer distance or undergo a larger rotation angle stroke than using conventional notch flexures. This paper presents a novel large-deflection annulus-shaped flexure hinge covering multiple curved-beam flexure elements. It has been shown that geometric symmetry in the constraint arrangement relaxes some of the design tradeoffs, resulting in some improved performances of the flexure hinge. Additional fixed RCM characteristic of isosceles-trapezoidal flexure modules existed in this compliant joint further improve its accuracy. A master-motion pseudo-rigid-body model provides a simple and accurate method to analyze the force-deflection behavior of this new rotary flexure hinge. The accuracy of the model is verified by comparing outcomes to non-linear finite element analysis. The result shows the proposed rotary flexure hinge has a large stroke angle, a low axial and radial stiffness.

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Su, Hai-Jun, and Hafez Tari. "On Line Screw Systems and Their Application to Flexure Synthesis." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28361.

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This paper presents a new screw theory that deals with “lines” and “line systems”. A line is a screw with a zero pitch. A rank m screw system is called a line screw system if it contains m linearly independent lines. The set of lines within a screw system is called the line variety. A general m-system is a line screw system if the rank of its line variety equals m. This paper will answer two questions: (1) how to calculate the rank of the line variety for a given m-system and (2) how to algorithmically find a set of linearly independent lines from the given screw system. The motivation of this work comes from flexure synthesis whose goal is to find a pattern of flexures to achieve a specified motion. It has been previously found that a wire flexure is considered a line screw, or more specifically a pure force wrench. The synthesis of flexures is to remove undesired motion by applying constraints with flexures. By following reciprocity and definitions of line screws, we have derived the sufficient and necessary conditions of line screw systems. When applied to flexure synthesis, we show that not all motion pattern can be realized with wire flexures connected in parallel. A computational algorithm based on the line screw theory is developed to find all admissible line screws or force wrenches for a given motion space. At last two flexure synthesis case studies are provided to demonstrate the theory and the algorithm.

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Hopkins, Jonathan B. "Analyzing and Designing Serial Flexure Elements." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12473.

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In this paper we introduce the principles necessary to analyze and design serial flexure elements, which may be used to synthesize advanced compliant mechanisms (CMs). The most commonly used flexure elements (e.g., wire, blade, or living hinge flexures) are often parallel and thus impose constraining forces directly through all parts of their geometry to the rigid bodies that they join within the CM. Serial flexure elements, on the other hand, constrain rigid bodies with a larger variety of forces and moments and thus enable CMs to achieve (i) more degrees of freedom (DOFs), (ii) larger dynamic and elastomechanic versatility, and (iii) greater ranges of motion than parallel elements. In this paper, we extend the principles of the Freedom and Constraint Topologies (FACT) synthesis approach such that it enables the synthesis of CMs that are not only constrained by parallel flexure elements, but also by serial elements. FACT utilizes geometric shapes to intuitively guide designers in visualizing compliant element geometries that achieve any desired set of DOFs. In this way, designers can rapidly generate a host of new serial flexure elements for various CM applications. Such elements are provided here as case studies.

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Su, Hai-Jun. "Mobility Analysis of Flexure Mechanisms via Screw Algebra." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48012.

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This paper presents a general framework for studying the mobility of flexure mechanisms with an arbitrary topology using screw algebra. The current approach for mobility analysis of flexures is ad hoc and mostly done by intuition. In this methodology, we first build a library of commonly used flexure elements, flexure joints and simple chains. We then apply the screw algebra to find their motion and constraint spaces in the form of twist and wrench matrices. To analyze a general flexure mechanism, we first apply a top-down approach to hierarchically subdivide it into multiple modules or building blocks down to the level of flexure structures that are already provided in the library. We then use a bottom-up routine to study the mobility of each module up to the level of the overall mechanism. Extensive examples and case studies from simple flexure joints, chains to spatial compliant platforms are used to demonstrate the methodology. This systematic methodology is an important tool for guiding the early stages in flexure mechanism design.

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Li, S. Z., J. J. Yu, X. Pei, Hai-jun Su, J. B. Hopkins, and M. L. Culpepper. "Type Synthesis Principle and Practice of Flexure Systems in the Framework of Screw Theory: Part III—Numerations and Synthesis of Flexure Mechanisms." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28963.

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In recent years, the increasing of application requirements call for development of a variety of flexure mechanisms with high precision or large motion and both. Therefore, in Part III of this series of papers we demonstrate how to use the methodology addressed in Part I to synthesize concepts for two kinds of flexure mechanisms, i.e. kinematics-type flexure mechanisms (KFMs) and constraint-type flexure mechanisms (CFMs) with the specified-DOF (Degree of Freedom) characteristics. Although most of them utilize parallel configurations and flexure elements, there is a clear difference in the behavior of flexures between KFMs and CFMs, The resultant type synthesis approaches fall into two distinct categories i.e. freedom-based and constraint-based one, both of which have presented in Part I. In order to derive useful flexure mechanism concepts available for different applications, a general design philosophy and rules are summarized firstly. As the main content of this part, the classifications, numerations, and synthesis for KFMs and CFMs are made in a systematic way. As a result, a majority of new precision flexure mechanisms are developed. In addition, qualitative comparisons are provided to demonstrate the performance and application differences between kinematic-type and constraint-type flexure mechanisms with the same DOF.

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Slocum, Jonathan T., Kenneth Kamrin, and Alexander H. Slocum. "A Buckling Flexure-Based Force-Limiting Mechanism." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-86388.

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A force-limiting buckling flexure has been created which can be used in a wide array of applications where excessive force from an implement can cause harm or damage. The buckling flexure is monolithic, contains no electronics, and can be manufactured using a single shot in an injection molding machine, making it extremely cost effective. In this paper, the design of this flexure is applied to a force-limiting toothbrush as an example of how this buckling flexure may be applied in a real-world technology. An overview of the buckling flexure is presented, and a structural model is shown to predict when the flexure will elastically buckle. This model is compared to data collected from flexures fabricated with varying buckling beam thickness. The data show that the force to buckle the flexure when applied at the tip can be predicted to within 20.84%. Furthermore, a preliminary model is presented which enables design of the buckling beam’s displacement, such that the total breakaway deformation can be maximized, making sensing the sudden deformation easier. As part of the application of the buckling flexure, an ergonomic, injection moldable toothbrush was created with the flexure built into the neck of the brush. When the user applies too much force while brushing, the flexure gives way and alerts the user when they have applied too much force and when the user lets off the force, the brush snaps back to its original shape. This design methodology is generalized and can be utilized in other force limited applications where an injection moldable, pre-set force, purely mechanical breakaway device is desired.

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Deo, Hrishikesh, and Xiaoqing Zheng. "Flexure Design for Progressive Clearance Labyrinth Seal." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71536.

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Turbo-machinery sealing is a challenging problem due to the varying clearances caused by thermal transients, vibrations or bearing lift–off. Conventional labyrinth seals have to be assembled with large clearances to avoid rubbing during rotor transients and this results in large leakage and lower efficiency. In our previous work, we have proposed a Progressive Clearance Labyrinth Seal which is mounted on flexures and employs progressively tighter teeth from the upstream to the downstream direction. The clearance progression gives rise to a feedback phenomenon whereby a small tip-clearance is maintained between the seal and the rotor. The flexures play a very important role in the design of this seal. They are required to have low radial stiffness relative to the fluidic feedback stiffness, so that the seal can move freely in response to the self-correcting forces. The axial stiffness has to be high to limit the displacement in that direction. Most importantly, the flexures need to provide extremely high twist stiffness, since a small twist can cause large changes in the clearance progression necessary for the self–correcting behavior. In this paper, we propose a novel zero–twist flexure architecture which preserves radial compliance and twist stiffness. We first create a simple analytical model to illustrate the design concept. An experimental setup is built and the design is validated on representative flexure geometry.

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Reports on the topic "Flexure"

1

Burchell, Timothy. Grade 2114: Flexure Strength and Elastic Properties. Office of Scientific and Technical Information (OSTI), September 2019. http://dx.doi.org/10.2172/1564183.

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Quinn, George D. High-temperature flexure fixture for advanced ceramics. Gaithersburg, MD: National Institute of Standards and Technology, 1992. http://dx.doi.org/10.6028/nist.ir.4864.

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Quinn, George D. Room-temperature flexure fixture for advanced ceramics. Gaithersburg, MD: National Institute of Standards and Technology, 1992. http://dx.doi.org/10.6028/nist.ir.4877.

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Orsi, N. Nick Orsi System Engineering Project - Shroud Flexure. Office of Scientific and Technical Information (OSTI), June 2021. http://dx.doi.org/10.2172/1804292.

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Zareh, Mohammad. Comparative study of lightweight and normal weight concrete in flexure. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.1481.

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Youngblood, G. E., and R. H. Jones. Minimum bar size for flexure testing of irradiated SiC/SiC composite. Office of Scientific and Technical Information (OSTI), March 1998. http://dx.doi.org/10.2172/335386.

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O'brien, S. J., W. L. Dickson, and R. F. Blackwood. Geology of the Central Portion of the Hermitage Flexure area, Newfoundland. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/121089.

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Hebdon, Matthew H., Cem Korkmaz, and Francisco J. Bonachera Martín. Member-Level Redundancy of Built-Up Steel Girders Subjected to Flexure. Purdue University, June 2018. http://dx.doi.org/10.5703/1288284316728.

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Al-Obaidi, Salam. Behavior of Reinforced Concrete Beams Retrofitted in Flexure Using CFRP-NSM Technique. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.2291.

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Burchell, Timothy. THE RESULTS OF 3-POINT FLEXURE TESTING OF IRRADIATED AGC-1 GRAPHITES SPECIMENS. Office of Scientific and Technical Information (OSTI), March 2015. http://dx.doi.org/10.2172/1550772.

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