Relevant bibliographies by topics / Wall thickness change

Contents

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

Academic literature on the topic 'Wall thickness change'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Wall thickness change"

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Guo, Fangmin, Yanbao Guo, Xiangguang Kong, Zhiwei Xiong, and Shijie Hao. "The Effect of Wall Thickness and Scanning Speed on the Martensitic Transformation and Tensile Properties of Selective Laser Melted NiTi Thin-Wall Structures." Metals 12, no. 3 (2022): 519. http://dx.doi.org/10.3390/met12030519.

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In this study, we analyzed the coupling effect of laser scanning speed and wall thickness on the phase transformation behavior and tensile properties of selective laser melted NiTi thin-wall structures. It is demonstrated that either scanning speed or wall thickness has their respective influence rule, whereas this influence could be changed when coupling them together; that is, under different scanning speeds, the effect of wall thickness could be different. It is found that the deviation of phase transformation temperature among different wall thicknesses is ~3.7 °C at 400 mm/s, while this d
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Peng, Song Yi. "Numerical Simulation Study of Wall Thickness Change Rule of Single Point Progressive Molding of Al5083." Journal of Engineering Research and Reports 26, no. 8 (2024): 258–68. http://dx.doi.org/10.9734/jerr/2024/v26i81243.

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With the development and progress of science and technology, the application of single-point progressive molding is more and more extensive, but single-point progressive molding still exists the problem of excessive thinning of wall thickness of molded parts, which seriously affects the quality of molded parts. The article takes Al5083 plate forming cone as the research object, uses Abaqus finite element simulation software, according to the principle of single variable, respectively explores the influence of process parameters such as tool head diameter, layer spacing, feed rate and residual
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Liu, Yang, Marius Herrmann, Christian Schenck, and Bernd Kuhfuss. "Axial and Radial Material Flow Analysis in Infeed Rotary Swaging of Tubes." MATEC Web of Conferences 190 (2018): 04003. http://dx.doi.org/10.1051/matecconf/201819004003.

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In rotary swaging – an incremental cold forming production technique to reduce the diameter of axisymmetric parts – the material flow can be assumed to be predominantly axial and radial. The actual ratio of this axial and radial flow influences the mechanical properties and especially in tube forming the final geometry. It is known that during mandrel free infeed rotary swaging of tubes the wall thickness changes. The change is depending on the process parameters like incremental and cumulated strain. Hence, the ratio of axial and radial material flow changes. Consequently, the analysis of the
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Wang, Liang, Jun Feng Shi, and Tian Qing Yu. "Influence of Wall Thickness and Concrete Grade of Shear Wall Amount." Advanced Materials Research 1065-1069 (December 2014): 1074–78. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.1074.

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Engineering examples and finite element structural analysis software SATWE was used to calculate by adjusting the shear wall thickness and grade to study the dynamic characteristics of concrete structures; analysis of seismic shear, natural vibration cycles, maximum interlayer displacement angle, lateral displacement stiffness to weight ratio and shear weight ratio of these parameters change rules, resulting in changes in shear wall thickness greater impact on shear wall amount.
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Sonwane, Amit Chandrashekhar. "Effect of Shear Walls on Seismic Behaviour in Multistory Building by Varying the Shear Wall Size and Location." International Journal for Research in Applied Science and Engineering Technology 13, no. 7 (2025): 467–73. https://doi.org/10.22214/ijraset.2025.73009.

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This paper is study about how multi story structure get affects the story shear Base shear & story stiffness parameters which are directly aligned with inclusion of shear wall in the building which indirectly affects the effectiveness during earthquake. A four-story structure for zone factor 0.16 as per Indian code were analyzed in ETABS 18.1.1 software where we carried four model with & without shear wall, varying thickness of shear wall & location of shear wall particularly at soft story. Incorporating shear walls increases story shear compared to structures without them, though
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Lacroix, M. "NATURAL CONVECTION HEAT TRANSFER FROM A DISCRETE HEAT SOURCE COUPLED WITH CONDUCTION DOMINATED PHASE CHANGE." Transactions of the Canadian Society for Mechanical Engineering 22, no. 3 (1998): 269–89. http://dx.doi.org/10.1139/tcsme-1998-0015.

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A numerical study has been conducted for the heat transfer from a discrete heat source by natural convection in air above coupled with conduction dominated melting of a phase change material (PCM) below via a wall of finite thermal diffusivity. Results indicate that the presence of a PCM layer underneath the wall significantly delays the temperature rise of the heat source. The time delay increases as the thermal diffusivity of the wail material decreases and as the thickness of the PCM layer increases. For high thermal conductivity wall materials [Formula: see text] the steady state heat sour
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Kotani, Yuji, Shunsuke Kanai, and Hisaki Watari. "Characteristic Features of Thickness Change of Pipe during Die Forming." Advanced Materials Research 383-390 (November 2011): 2794–800. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2794.

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Recently the growing demand for light weight products with high strength has been increased by the rapid development of automobile and aircraft technology. Also, reduction of carbon dioxide emissions is one of the most important issues also in the automobile industry. The weight reduction technology is important even if applied to electric vehicles rather than gasoline vehicles, as reduction of energy consumption is an important issue. Plastic processing of hollow pipes is an important technology for realizing weight reduction of automobile components. As an example of research into pipe formi
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Popovski, Kire, Sevde Stavreva, Ivo Kuzmanov, and Igor Popovski. "Mathematical model for computer simulation for selection of the order for the layers from the wall of industrial coolers." South Florida Journal of Development 3, no. 3 (2022): 3681–88. http://dx.doi.org/10.46932/sfjdv3n3-051.

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A mathematical model and computer software was developed for calculating the thickness of the insulation layers (panels) from the walls of the industrial coolers based on the order of their installation. A numerical example is given that is tested on an existing industrial cooler in Bitola, Macedonia. In order to calculate the thickness of the thermal insulation it is necessary to consider a multilayer barrier (wall) where for each layer the thickness is known, except for the insulation material which should be calculated. With the determined geometric and physical characteristics of the wall,
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Kalinović, Saša M., Jelena M. Djoković, Ružica R. Nikolić, and Branislav Hadzima. "Calculation of the Thermal Dynamic Performance of the Residential Buildings’ Walls." Quality Production Improvement - QPI 1, no. 1 (2019): 212–21. http://dx.doi.org/10.2478/cqpi-2019-0029.

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Abstract Calculation of the thermal dynamic properties of the multi-layer wall isolation of residential buildings is presented in this paper. Taking into account that the final objective is to create a building with the highest energy efficiency ratio, i.e. with the lowest energy consumption, both for heating and cooling, it is necessary to realize the good thermal characteristics of the multi-layer wall. To obtain the optimal solution for the wall's structure, various wall structures with different thicknesses of the individual layers, were analyzed. Based on results, presented in this paper,
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Stepkova, Vilgelmina, and Jiří Hlinka. "Pinning of a ferroelectric Bloch wall at a paraelectric layer." Beilstein Journal of Nanotechnology 9 (August 31, 2018): 2356–60. http://dx.doi.org/10.3762/bjnano.9.220.

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The phase-field simulations of ferroelectric Bloch domain walls in BaTiO3–SrTiO3 crystalline superlattices performed in this study suggest that a paraelectric layer with a thickness comparable to the thickness of the domain wall itself can act as an efficient pinning layer. At the same time, such a layer facilitates the possibility to switch domain wall helicity by an external electric field or even to completely change the characteristic structure of a ferroelectric Bloch wall passing through it. Thus, ferroelectric Bloch domain walls are shown to be ideal nanoscale objects with switchable pr
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Dissertations / Theses on the topic "Wall thickness change"

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MacIntyre-Newell, Meaghan. "Vascular Changes in the Supraspinatus Muscle and Association with Intramuscular Fat Accumulation: An Experimental Study in Rabbits." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37835.

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Supraspinatus (SSP) tendon tear leads to intramuscular fat accumulation in the SSP muscle and the mechanisms are currently unknown. The purpose of this study was to investigate changes in vascularization of the SSP muscle and the relationship to intramuscular fat accumulation following SSP tendon detachment with or without reattachment. One hundred and six rabbits underwent SSP tendon detachment. In groups of ten, thirty rabbits were sacrificed 4, 8, and 12 weeks following detachment. Forty rabbits underwent detachment and immediate reattachment and were sacrificed in groups of ten following 0
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Muraoka, Yuki. "Age- and Hypertension-Dependent Changes in Retinal Vessel Diameter and Wall Thickness: An Optical Coherence Tomography Study." Kyoto University, 2014. http://hdl.handle.net/2433/188665.

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Prendin, Angela Luisa. "Environmental effects and biophysical constraints on xylem physiology and tree growth in conifers in the Alps." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3423237.

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Trees are impressive long-living organisms that continuously increase in size by many orders of magnitude during ontogeny by accumulating xylem biomass in stem, branches and roots. While growing taller, trees continuously adjust the xylem structure to achieve an optimal balance of carbon costs for the competing biomechanical and hydraulic requirements. One of the main function of the xylem structure is the delivery of the water from the roots up to the leaves. This must be maintained during the ontogeny, when the hydrodynamic resistance increase due to the increase in the xylem path length. H
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Markert, Matthew S. "Checking the Walls for Cracks: Race/Ethnic Differences in Age-Related Arterial Changes, and the Relevance of Carotid Ultrasound for Subclinical Neurovascular Disease." Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_dissertations/676.

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Despite advances, stroke remains the largest cause of disability and fourth leading cause of death in the United States. The relationship between changes in human vasculature (atherosclerosis and arteriosclerosis) prior to clinical incident, and other risk factors for stroke remains unclear. This dissertation represents work towards the identification of imaging biomarkers for vascular change, focusing on ultrasound to characterize persons at risk, including differences among race/ethnic groups. This research contained three distinct projects. The first goal was to determine if changes within
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Books on the topic "Wall thickness change"

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Montgomery, Hugh, and Rónan Astin. Normal physiology of the cardiovascular system. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0128.

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Preload modulates contractile performance, and is determined by end-diastolic volume (EDV) and ventricular compliance. Compliance falls with increasing preload, muscle stiffness or ventricular hypertrophy, making central venous pressure (CVP) a poor surrogate for EDV. Responsiveness to fluid loading can be identified by seeking a change in stroke volume (SV) with changes in cardiac loading. Afterload, the force to be overcome before cardiac muscle can shorten to eject blood, rises with transmural pressure and end-diastolic radius, and inversely with wall thickness. Afterload, being the tension
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Keshav, Satish, and Alexandra Kent. Inflammatory bowel disease. Edited by Patrick Davey and David Sprigings. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199568741.003.0203.

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Inflammatory bowel disease (IBD) encompasses ulcerative colitis (UC) and Crohn’s disease (CD). Both conditions cause chronic relapsing inflammation in the gastrointestinal (GI) tract, but have different characteristics. UC causes diffuse mucosal inflammation limited to the colon, extending proximally from the anal verge, with the rectum involved in 95% of patients. UC is described in terms of the disease extent: proctitis (confined to the rectum), proctosigmoiditis (disease confined to the recto-sigmoid colon), distal disease (distal to the splenic flexure), and pan-colitis (the entire large i
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Book chapters on the topic "Wall thickness change"

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Weiß, Alexander, and Mathias Liewald. "Cold Forging of Hollow Shafts with Variable Wall Thickness by Means of an Adjustable Forming Zone." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-58006-2_14.

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AbstractHollow shafts are widely used due to their high weight saving potential and only slight reduction of their bending and torsional stiffness compared to solid shafts. Additional weight savings can be achieved by a specific material allocation within the hollow shaft, which can be achieved by varying their wall thickness. The production of such hollow shafts by conventional forming processes and multiple forming stages appears quite costly today. Alternatively, incremental forming processes could be used, but those are very time-consuming. In order to overcome these disadvantages, this pa
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Wang, Song. "Simulation Design of Non-lethal Hollow Spherical Kinetic Energy Projectile Based on ANSYS LS-DYNA." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-7887-4_22.

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Abstract In order to promote the intrinsically safe design of non-lethal kinetic energy projectile, an optimization design study was carried out for 38 mm hollow spherical non-lethal kinetic energy projectile. The impact rigid wall experiment of solid spherical projectile was used to complete the indirect verification of the projectile material parameters. The projectile wall thickness of 5, 7, 9, 11 and 13 mm was set respectively. Based on ANSYS LS-DYNA software, the changes of velocity, kinetic energy, radius, specific kinetic energy, VCmax value, energy transfer ratio and other data under f
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Serruys, Patrick W., Brian Jaski, Federico Piscione, et al. "Early changes in wall thickness and epicardial wall motion during percutaneous transluminal coronary angioplasty in man." In Developments in Cardiovascular Medicine. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0453-8_2.

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Serruys, Patrick W., Brian Jaski, Federico Piscione, et al. "Early changes in wall thickness and epicardial wall motion during percutaneous transluminal coronary angioplasty in man. Similarities with in vitro and in vivo model." In Developments in Cardiovascular Medicine. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4295-0_2.

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Xin Wei and Lei Yin-Zhao. "Analysis of a Pulsed Eddy Current Testing Method for Ferromagnetic Pipeline Wall Thickness Determination Considering Minor Hysteresis." In Studies in Applied Electromagnetics and Mechanics. IOS Press, 2015. https://doi.org/10.3233/978-1-61499-509-8-117.

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By applying a periodic pulsed current, the minor hysteresis curves of ferromagnetic material are measured. Because the minor hysteresis curve obtained has the characteristics of multiple values, the traditional solving method of nonlinear equations can't be directly applied. So considering a piecewise method, the multi-value minor hysteresis curve is converted to a series of single-value nonlinear curves according to the turning points, and then uses the solving method of nonlinear equations to solve every single-value curve. The paper uses finite element software for simulation to obtain the
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Angani Chandra S., Ramos Helena G., and Ribeiro Artur L. "Detection of Wall Thickness of Stainless Steel Using Transient Eddy Current Oscillations Method." In Studies in Applied Electromagnetics and Mechanics. IOS Press, 2016. https://doi.org/10.3233/978-1-61499-639-2-70.

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In this study a new nondestructive testing (NDT) method called transient eddy current oscillations (TECO) is used to detect a change in the thickness of stainless steel plates. The TECO method uses a probe that includes a capacitor and an induction coil, which are connected in parallel, to generate a transient oscillatory regime in the excitation current to induce eddy currents in the test object. A Hall-effect sensor is used to measure the resultant magnetic field in the vicinity of the test material. The experimental results were analyzed to conclude about the thickness variation of the test
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Gómez-Bernal, Alonso, Eduardo Arellano Méndez, Luis Ángel Quiroz-Guzmán, Hugón Juárez-García, and Oscar González Cuevas. "Behavior and Design of Transfer Slabs Subjected to Shear Wall Loads." In Advances and Technologies in Building Construction and Structural Analysis. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.93682.

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This paper investigates the behavior of a transfer slab system used in medium rise building. For this purpose, two slab-wall full-scale specimens were designed, built, and tested to cyclic loads. The two slab-wall prototypes were exposed to three load stages: (a) vertical load, (b) horizontal load, and (c) vertical and horizontal combined load. The first specimen, SP1, includes a masonry wall situated on top of a squared two-way slab of 4.25 m by side, thickness of 12 cm, on four reinforced concrete girders, while the second specimen, SP2, consists of an identical slab but was constructed with
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Major, Zoltán, Edina Koch, and Éva Lublóy. "Change in Stiffness of Reinforced Concrete Tunnel Walls and Its Effect Under Fire Load." In Advances in Transdisciplinary Engineering. IOS Press, 2024. http://dx.doi.org/10.3233/atde240565.

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This article uses the knowledge gained from tunnel fires to address the structural analysis of tunnel walls during fire exposure. The designing at normal temperature and its theoretical background are discussed in the literature. As these books did not yet deal with the issue of fire protection designing, we tried to supplement the existing theoretical knowledge with the knowledge provided by the relevant standards for reinforced concrete tunnel walls. In addition, we have tried to add our own individual ideas to the theory where we felt that there were gaps. The theoretical summary has been c
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de Santos C., Ledesma A., Lloret A., and Alonso E.E. "Evaluation of alternative methodologies to minimize movements of a diaphragm wall close to buildings." In Proceedings of the 15th European Conference on Soil Mechanics and Geotechnical Engineering. IOS Press, 2011. https://doi.org/10.3233/978-1-60750-801-4-1461.

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In the framework of the construction of the high-speed railway passing through Barcelona, a large excavation (21m depth) has made to about 2 m of a building. The excavation was done in the quaternary material typical of the Barcelona plain which consists mainly of low plasticity and slightly cemented compact clays. This material due to its high stiffness can be considered as a “hard soil”. In order to minimize movements, several methodologies were considered: change in the thickness of the diaphragm walls, increasing the length of the diaphragm walls and location of struts.
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Gots, Volodymyr, Valeriy Makarenko, and Oksana Berdnyk. "Character of the Destruction Pipe During Polygon Pneumatic Tests." In Advances in Transdisciplinary Engineering. IOS Press, 2024. https://doi.org/10.3233/atde241159.

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It was established that the plastic deformation of the thickness reduction of the rupture edges for economically modified steel 06G2AB is 12–20%. The change in the deformation of the thinning of the pipe walls and the width of the plastic deformation zone from the speed of viscous failure in a pipe with a diameter of 800 mm was experimentally determined. In the process of researching the propagation of fractures as a result of pneumatic tests of pipes at the test site, the width of the plastic zone and the speed of crack propagation were determined, as well as the fibrous component in the cros
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Conference papers on the topic "Wall thickness change"

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Tang, Fujian, Yizheng Chen, Yan Tang, and Genda Chen. "Monitoring Pitting Corrosion Penetration in Steel Rebar Using Optical Fiber." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09513.

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Abstract In this study, an optical fiber corrosion sensor is developed to monitor the penetration of corrosion pits in steel bars. The sensor was simply made by encasing one end of an optical fiber into a steel straw. As the corrosion penetrates through the steel straw wall, the corrosive solution and corrosion products fill inside and contaminate the fiber end surface, resulting in a change in the reflectivity. The change of the optical fiber reflectivity indicates the corrosion pits depth equaling to the wall thickness of the steel straw. Steel straw was fabricated from rebar steel with an i
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Schmitt, G., C. Bosch, U. Pankoke, W. Bruckhoff, and G. Siegmund. "Evaluation of Critical Flow Intensities for FILC in Sour Gas Production." In CORROSION 1998. NACE International, 1998. https://doi.org/10.5006/c1998-98046.

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Abstract Using submerged jet impingement experiments critical wall shear stresses for initiation of flow induced localized corrosion (FILC) were evaluated for the system carbon steel/aqueous polysulfide containing monoethylamine (MEA) solutions/H2S (22 to 42 bar). Due to an extraordinary MEA concentration effect the critical wall shear stress at 130 °C was about 90 N/m2 in 2.4 M MEA, but only 2N/m2 in 5 M MEA solution. Inhibition could increase this low value to 17 N/m2. Wall shear stresses up to 53 N/m2 could be reached by precorrosion under subcritical flow conditions and use of an inhibitor
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Pint, B. A., and J. R. Keiser. "Alloy Selection for High Temperature Heat Exchangers." In CORROSION 2006. NACE International, 2006. https://doi.org/10.5006/c2006-06469.

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Abstract Various commercial alloys are being investigated for use as shield tubes in a high temperature heat exchanger for a black liquor gasification system at a paper mill. As a first step in the selection process, laboratory air exposures are being conducted at 900°-1100°C for times >36,000h to model lifetime as a function of tube wall thickness. The results at the highest temperature illustrate the performance difference between alumina- and chromia-forming alloys. Alumina-formers of sufficient thickness can be expected to meet the 40,000h lifetime goal at 1100°C. Among the chromia-
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Andresen, Peter L., and Martin M. Morra. "Effects of Increasing and Decreasing Stress Intensity Factor on SCC in Hot Water." In CORROSION 2005. NACE International, 2005. https://doi.org/10.5006/c2005-05469.

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Abstract The effect of rising and falling stress intensity factor (K) on the SCC growth rates of stainless steel and nickel alloys has been studied in high temperature water. This is done using sophisticated test control software that changes loading (P) based on crack length (a) to achieve a specific K trajectory by controlling dK/da, not simply dP/dt. The majority of SCC problems develop adjacent to welds, which have a complex residual stress profile vs. wall thickness. This, coupled with the dependence of K on crack length, causes K to change as the crack grows, not per se with time (t). Th
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Isakovich, Isaac, Roberto Villalba, Carol Barrios, et al. "Evaluation of the Internal Corrosion and the Solids Depositions Problematic in the Compression Plants Located in the East Part of Venezuela." In CORROSION 2006. NACE International, 2006. https://doi.org/10.5006/c2006-06371.

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Abstract The paper describes a study developed in a gas compression systems located in the Punta de Mata oil fields in Venezuela. The study was developed for the considerable increase in frequency of replacements caused by wall thickness loss on the spools of the gas compression systems, specifically the section between the cooling system outlet and the liquid purification system inlet, in all compression phases. Also, the operational conditions were a case study for the liquid and solid drag increase, observed at the gas compressing systems. The evaluation consisted in the execution of the fo
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Fazackerley, William. "Managing Corrosion Risk in Carbon Capture and Storage Facilities Using Non-Intrusive Monitoring Technologies." In CONFERENCE 2023. AMPP, 2023. https://doi.org/10.5006/c2023-18856.

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Abstract Carbon capture and storage (CCS) is a fast-growing tool for reducing global carbon emissions in order to combat climate change. CCS technology is in its relative infancy and showed 48% growth in 2021 for commissioned projects. With unknown or new technology comes unknown risk, especially from corrosion. Some recent high profile CCS projects have been delayed owing to a range of factors, including in some cases extreme corrosion caused by contaminants in the piping. A corrosion event could be catastrophic, causing potential loss of life. Monitoring the risk and impact of corrosion and
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Lu, Z. Y., W. Zhang, J. Li, et al. "Casing Stress Analysis Under Dynamic Change of In-Situ Stress." In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0232.

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ABSTRACT During hydraulic fracturing of shale oil wells, fracturing fluid enters the formation causing dynamic changes in in-situ stress in the near-wellbore region, which in turn affects the wellbore stress. This paper takes into account the change of in-situ stress caused by fracturing fluid pumped into the formation, derives the analytical solution of wellbore stress under non-uniform in-situ stress conditions, and analyzes the effects of surface pumping pressure, delivery rate, casing wall thickness, formation Young's modulus and Poisson's ratio on casing stress. The results show that: wit
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Zhu, Bin, Christopher D. Rahn, and Charles E. Bakis. "Tailored Fluidic Composites for Stiffness or Volume Change." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-4962.

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An analytical model of a composite structure consisting of an F2MC tube embedded in epoxy is used to study the impact of confining structural media on the ability of F2MC tubes to pump fluid and change stiffness. The surrounding stiff epoxy reduces the performance relative to an isolated F2MC tube, but this disadvantage can be minimized by tailoring the tube wall thickness and fiber angle. The composite can pump 250 times more fluid than a piston of the same diameter if the F2MC tube has a thick shell wall and a near-axial fiber orientation. With a moderately thick wall and low fiber angle, th
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Han, Youngbae, and Naoki Shikazono. "Liquid Film Thickness in Micro Tube Under Flow Boiling Condition." In ASME 2009 7th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2009. http://dx.doi.org/10.1115/icnmm2009-82194.

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Slug flow is one of the representative flow regimes of flow boiling in micro tubes. It is well known that the thin liquid film formed between the tube wall and the vapor bubble plays an important role in micro scale heat transfer. In the previous study [1], liquid film thickness under adiabatic condition was investigated and an empirical correlation for the initial liquid film thickness based on capillary number, Reynolds number and Weber number was proposed. In the present study, the effects of wall superheat and bubble acceleration on the liquid film thickness are investigated. Under flow bo
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Froerer, Dathan, and James R. Ferguson. "Transient Testing to Determine Heat Transfer Coefficient and Wall Thickness of Turbine Blades." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60247.

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The integrity of interior passages of cast components, such as turbine blades, is critical to the functionality of these components. Testing methods, which provide a timely judgment of the passages, is essential to the cost effective production of these parts. The goals of this project is to estimate the local internal heat transfer coefficients and wall thickness using inverse heat transfer techniques from the transient response exhibited by the exterior wall temperature to a sudden change in the air flow temperature within the passages. The desired result is a computationally efficient test
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Reports on the topic "Wall thickness change"

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Sheets, Colton. PR-201-084504-R01 Long-Term Composite Repair Study - Burst Test. Pipeline Research Council International, Inc. (PRCI), 2020. http://dx.doi.org/10.55274/r0011714.

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Stress Engineering Services, Inc. (SES) was contracted by Pipeline Research Council International, Inc. (PRCI) to perform a study examining the long-term performance of composite repairs used for pipeline applications. The project reported here (PRCI study MATR-3-4 Long-term Composite Repair Study) included the installation of commercially available composite repair systems on pipe samples with regions of machined wall loss having depths of up to 75% of the pipe wall-thickness. Samples were fabricated using 12.75-inch x 0.375-inch, Grade X42 pipe material with each having a machined wall loss
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Kwun and Tennis. L41032 Calibration Requirements for Applying the MIVC Technique to Pipeline Stress Measurements. Pipeline Research Council International, Inc. (PRCI), 1998. http://dx.doi.org/10.55274/r0011127.

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The primary objectives of this project were to (1) determine the variability of the magnetically induced velocity change (MIVC) and its stress dependence among pipes of the same grade material manufactured during different time periods and (2) evaluate the extent of calibration required for a given grade pipe material to apply the MIVC technique for stress measurements. In this project, X-52 grade was chosen as the target material for evaluation, A total of five pipe samples, fabricated during times ranging from the 1950s to the 1990s were investigated. The pipes varied in both diameter (20 an
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Pargeter. L51632 Evaluation of the Time Delay for Cold Cracking. Pipeline Research Council International, Inc. (PRCI), 1991. http://dx.doi.org/10.55274/r0010555.

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Program to determine the potential delay times required to cause cold cracking (hydrogen cracking). Cracking induced in welds deposited into circumferential grooves has been monitored by ultrasonic techniques. Initial use of an array of fixed transducers which were switched electronically was found to be inadequate for the determination of delay times under near threshold cracking conditions. Since delay times are expected to be greatest for such conditions, a change was made to intermit tent monitoring using P-scan equipment. By plotting percentage projected area free from reflections of less
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Graville, B. A. L51707 Factors Affecting Heat Affected Zone Root Strains in Pipeline Girth Welds and Repairs. Pipeline Research Council International, Inc. (PRCI), 1993. http://dx.doi.org/10.55274/r0010219.

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A previous study on hydrogen cracking in the heat affected zone of pipeline girth welds and repairs found that large strains in the HAZ transverse to the weld played a major role in causing cracking. Large transverse strains were believed to arise from bending of the weld due to the thermal contraction of the weld around the pipe circumference. Large root strains were simulated in the laboratory using a bend test which enabled the effect of material composition and strength to be studied. In the bend test, the specimen deflection at the onset of cracking, indicated by a drop in load, was used
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Morsy, Amr, and Islam Ebo. Development of Physics-Based Deterioration Models for Reinforced Soil Retaining Structures. Mineta Transportation Institute, 2025. https://doi.org/10.31979/mti.2024.2360.

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Reinforced soil walls are key earth retention features in the transportation infrastructure. They are used to support and retain soil in a wide variety of crucial structures, such as highways, bridges, and railways, to ensure stability. They also provide solutions for constructing embankments and slopes in constrained spaces, allowing for efficient land use and improved infrastructure planning. This study used advanced numerical modeling to improve the understanding of the behavior and long-term performance of the aging reinforced soil walls from the 1970s for asset management purposes. An ass
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Holden, T., R. Hosbons, and J. Root. CWI1988-Andi-21 Neutron Diffraction of Axial Residual Strains Near a Circumferential Crack. Pipeline Research Council International, Inc. (PRCI), 1989. http://dx.doi.org/10.55274/r0011391.

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The intent of the experiments reported here was to measure the axial residual strain at the 6:00 position of a girth-weld in the presence of a crack which had propagated a few millimeters from the inside diameter of the llnepipe. The linepipe, 914 mm diameter and average thickness 16.2 mm had been previously examined at Chalk River and the strains at the 1:30, 6:00 and 10:30 positions had been measured prior to the introduction of the crack. Large changes in the level of axial residual strain and introduction of strong through-wall strain gradients are observed on re- welding 16 mm line pipe w
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Parkins, R. N., and R. R. Fessler. NG-18-85-R01 Line Pipe Stress Corrosion Cracking Mechanisms and Remedies. Pipeline Research Council International, Inc. (PRCI), 1986. http://dx.doi.org/10.55274/r0012143.

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Stress corrosion cracking of line pipe from the soil side involves slow crack growth at stresses which may be as low as half the yield strength, this slow crack growth continuing until the crack penetrates the wall to produce a leak or until the stress intensity on the uncracked ligament reaches the value for a fast fracture to penetrate the wall thickness. The controlling parameters that contribute to the mechanism of failure, essentially involving growth by dissolution in the grain boundary regions, are, as with other systems displaying such failure, electrochemical, mechanical, and metallur
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Krivoi, Kallmeyer, and Baranyak. L52199 Nopig Metal-Loss Detection System for Non-Piggable-Pipelines. Pipeline Research Council International, Inc. (PRCI), 2005. http://dx.doi.org/10.55274/r0011343.

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This project investigated and upgraded the digital filtering used to interpret NoPig displacement data. This upgrade should allow the system to be used on long seam welded pipes. Limited laboratory testing was performed to show the improvement on ERW pipe. The NoPig method is a non-destructive testing method for unpiggable pipelines which uses above ground measurements for detecting and sizing wall thickness anomalies like corrosion. The method uses an applied current containing several distinct frequencies between two points on a pipeline up to 1 km apart. The resultant magnetic field is meas
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Wilkowski, G. M., D. Rudland, P. Mincer, B. Metrovich, and D. Rider. ASME-PVP05 Brittle-to-Ductile Fracture Initiation Transition Temperature for Old Linepipe w Surface-Crack. Pipeline Research Council International, Inc. (PRCI), 2005. http://dx.doi.org/10.55274/r0011772.

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Much work has been done to assess constraint effects on the crack-driving force for specimens and cracks in pipes. The material's transition temperature where the fracture process changes from ductile tearing to cleavage fracture at crack initiation is affected by the constraint conditions but is a material property that cannot be determined analytically. This paper presents a methodology to account for constraint effects to predict the lowest temperature where ductile fracture initiation occurs and relates that temperature back to Charpy impact data for X60 and lower grades, particularly for
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Lee, Wall, and Burch. L52333 NDE and Inspection Techniques Applied to Composite Wrap Repairs. Pipeline Research Council International, Inc. (PRCI), 2012. http://dx.doi.org/10.55274/r0010468.

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The objective includes: Assess commercially available inspection methods to validate integrity of composite repair systems. Identify applicability to inspect composite overwrap and parent metal for both onshore and sub-sea pipelines (where information is available). Identify sources of data to include other users of composite materials(aerospace/aircraft, naval/ship repairs). Identify procedures and technologies to assess inspection effectiveness and provide a gap analysis. Interface with other PRCI projects on long-term testing of composite repairs and other joint industry projects on composi
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