Relevant bibliographies by topics / Shrinkage defects prediction

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Shrinkage defects prediction'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Shrinkage defects prediction"

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Kim, Sung Bin, Young Hoon Yim, Joong Mook Yoon, and Doru Michael Ştefănescu. "Prediction of Shrinkage Defects in Iron Castings Using a Microporosity Model." Materials Science Forum 925 (June 2018): 411–18. http://dx.doi.org/10.4028/www.scientific.net/msf.925.411.

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A numerical model for prediction of shrinkage defects in iron castings has been developed. The model is based on gas pores evolution during solidification. It describes the evolution of gas concentration using mass conservation, and the change in melt pressure due to solidification contraction using Darcy’s equation, with mixture continuity assumption in the liquid and the mushy zone. Gas pores nucleation has been calculated using the partial pressure of gas obtained from Sievert’s law. The growth of porosity has been estimated using an equation based upon the total melt pressure on the pore,
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Mahardika, Muslim, and A. Syamsudin. "Prediction of Shrinkage Porosity in Femoral Stem of Titanium Investment Casting." Archives of Foundry Engineering 16, no. 4 (2016): 157–62. http://dx.doi.org/10.1515/afe-2016-0102.

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Abstract Design of gating system is an important factor in obtaining defect-free casting. One of the casting defects is a porosity caused by internal shrinkage in solidification process. Prediction of the internal shrinkage porosity in the femoral stem of commercially pure titanium (CP-Ti) is investigated based on the gating system design. The objective of this research is to get the best gating system between three gating system designs. Three gating system designs of the femoral stem were simulated in an investment casting method. The internal shrinkage porosity occurs on the largest part an
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Hajkowski, J., P. Roquet, M. Khamashta, E. Codina, and Z. Ignaszak. "Validation Tests of Prediction Modules of Shrinkage Defects in Cast Iron Sample." Archives of Foundry Engineering 17, no. 1 (2017): 57–66. http://dx.doi.org/10.1515/afe-2017-0011.

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Abstract The paper presents the results of experimental-simulation tests of expansion-shrinkage phenomena occurring in cast iron castings. The tests were based on the standard test for inspecting the tendency of steel-carbon alloys to create compacted discontinuities of the pipe shrinkage type. The cast alloy was a high-silicone ductile iron of GJS - 600 - 10 grade. The validation regarding correctness of prognoses of the shrinkage defects was applied mostly to the simulation code (system) NovaFlow & Solid CV (NFS CV). The obtained results were referred to the results obtained using the Pr
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Tavakoli, Rouhollah. "On the prediction of shrinkage defects by thermal criterion functions." International Journal of Advanced Manufacturing Technology 74, no. 1-4 (2014): 569–79. http://dx.doi.org/10.1007/s00170-014-5995-0.

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Konečná, Radomila, S. Fintová, and Gianni Nicoletto. "Shrinkage Pores and Fatigue Behavior of Cast Al-Si Alloys." Key Engineering Materials 465 (January 2011): 354–57. http://dx.doi.org/10.4028/www.scientific.net/kem.465.354.

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The fatigue strength of cast Al-Si alloys is strongly sensitive to the presence of casting defects. Extensive rotating bending fatigue testing of cast AlSi7Mg alloy at room temperature and 50 Hz is reported showing that shrinkage pores are the critical casting defect. The porosity of selected fatigue specimens extracted from castings is characterized with metallography using different pore sizing criteria. Data are fitted to EVS distributions and used for critical size prediction. Fatigue fracture surfaces are inspected in the SEM and the critical pores originating the fatigue cracks identifie
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Sowa, Leszek, Tomasz Skrzypczak, and Paweł Kwiatoń. "The influence of the riser dimensions on the effectiveness of feeding solidifying cast elements." MATEC Web of Conferences 254 (2019): 02016. http://dx.doi.org/10.1051/matecconf/201925402016.

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The mathematical model and numerical simulation results of metals alloy solidification process based on the finite element method (FEM) are presented in this paper. After completion of the mould filling process the main solidified of molten metal takes place and its shrinkage. The phenomenon of casting shrinkage cannot be avoided. However, it is possible to minimize the occurrence of its negative effects on the casting quality. The phenomenon of shrinkage defects formation was included in the numerical calculations and they were tried to reduce them. It is important aspect of this work which m
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Ignaszak, Z. "Discussion on Usability of the Niyama Criterion for Porosity Predicting in Cast Iron Castings." Archives of Foundry Engineering 17, no. 3 (2017): 196–204. http://dx.doi.org/10.1515/afe-2017-0115.

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Abstract The paper refers to previous publications of the author, focused on criteria of casting feeding, including the thermal criterion proposed by Niyama. On the basis of this criterion, present in the post-processing of practically all the simulation codes, danger of casting compactness (in the sense of soundness) in form of a microporosity, caused by the shrinkage phenomena, is predicted. The vast majority of publications in this field concerns shrinkage and feeding phenomena in the cast steel castings – these are the alloys, in which parallel expansion phenomenon does not occur as in the
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Reis, A., Z. A. Xu, R. V. Tol, et al. "Model for prediction of shrinkage defects in long and short freezing range materials." International Journal of Cast Metals Research 20, no. 3 (2007): 171–75. http://dx.doi.org/10.1179/136404607x239771.

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Landry, Benoit, and Pascal Hubert. "Process modelling of discontinuous long fibre carbon/polyether ether ketone composites: Defect prediction." Journal of Composite Materials 53, no. 18 (2019): 2505–15. http://dx.doi.org/10.1177/0021998319831757.

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A numerical model was developed to predict the defect formation during processing of compression moulded discontinuous long fibre carbon/polyether ether ketone composites. The model inputs are the material's temperature-dependant properties (through-thickness modulus and thermal shrinkage), the temperature distribution of the part during cooling and the applied moulding pressure. The material properties of carbon/polyether ether ketone prepreg were measured during cooling from melt using thermal analyses. The model was employed to identify regions on manufactured panels where pressure could be
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Huang, Zhicheng, Jean-Yves Dantan, Alain Etienne, Mickaël Rivette, and Nicolas Bonnet. "Geometrical deviation identification and prediction method for additive manufacturing." Rapid Prototyping Journal 24, no. 9 (2018): 1524–38. http://dx.doi.org/10.1108/rpj-07-2017-0137.

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Purpose One major problem preventing further application and benefits from additive manufacturing (AM) nowadays is that AM build parts always end up with poor geometrical quality. To help improving geometrical quality for AM, this study aims to propose geometrical deviation identification and prediction method for AM, which could be used for identifying the factors, forms and values of geometrical deviation of AM parts. Design/methodology/approach This paper applied the skin model-based modal decomposition approach to describe the geometrical deviations of AM and decompose them into different
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Dissertations / Theses on the topic "Shrinkage defects prediction"

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Tavakoli, Ruhollah. "Optimal Design of Feeding System in Steel Castings." Phd thesis, 2009. http://tel.archives-ouvertes.fr/tel-00484191.

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In the present study, the optimal design of feeding system in steel sand-mold castings is considered. The first part of this research includes fundamental studies on the physics of shrinkage defect formation during the casting process. The results of these studies lead to new findings on the mechanism of shrinkage defect formation, effect of melt quality on the distribution of defects within the castings and the connection between shrinkage and gases defects. The theoretical analysis of thermal criterion functions for the prediction of shrinkage defects in castings and introducing new criterio
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Book chapters on the topic "Shrinkage defects prediction"

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Mahomed, Nawaz. "Shrinkage Porosity in Steel Sand Castings: Formation, Classification and Inspection." In Casting Processes and Modelling of Metallic Materials. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.94392.

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In this Chapter, shrinkage porosity defects in steel castings are analysed, particularly for low carbon, high alloyed steels, which have applications in critical engineering components. It begins with the mechanisms for porosity formation within the solidification contraction phase of the casting cycle, highlighting the importance of feeder design. This is followed by characterisation of the solidification phase of steel alloys, including the evolution of phases, which is important in distinguishing between microstructure and porosity in microscopy analysis. A more detailed discussion of interdendritic feeding and mechanisms for shrinkage micro-porosity is then provided. This leads to the well-established interdendritic flow model and commonly-used thermal criteria for shrinkage porosity prediction. The discussions are then consolidated through the classification of shrinkage porosity in terms of formation mechanisms and morphology, and its causes relating to composition, design and process conditions. Finally, engineering standards for classification and inspection of porosity types and severity levels in steel castings are discussed. Throughout, basic design and process improvement approaches for improving melt feeding during solidification contraction is given, with emphasis on providing practical solutions for prediction and evaluation of shrinkage porosity defects in castings.
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Conference papers on the topic "Shrinkage defects prediction"

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Selivyorstova, Tatjana, and Aleksandr Mikhalyov. "Analysis of Prediction Mathematical Models of Shrinkage Defects in Castings." In 2018 IEEE First International Conference on System Analysis & Intelligent Computing (SAIC). IEEE, 2018. http://dx.doi.org/10.1109/saic.2018.8516811.

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Reis, A., Zhi an Xu, J. F. Duarte, A. D. Santos, Y. Houbaert, and A. B. Magalhães. "A Model for Prediction of Shrinkage Defects in Long and Short Freezing Range Materials." In MATERIALS PROCESSING AND DESIGN; Modeling, Simulation and Applications; NUMIFORM '07; Proceedings of the 9th International Conference on Numerical Methods in Industrial Forming Processes. AIP, 2007. http://dx.doi.org/10.1063/1.2740951.

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Rakita, Milan, and Qingyou Han. "Simulation of Solidification Defects for Prediction of Dross Formation in Aluminum 5182 Remelt Secondary Ingot." In ASME 2009 International Manufacturing Science and Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/msec2009-84160.

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In aluminum recycling about 4% on average is lost on oxidation and dross. However, large percent of remelt secondary ingots (RSI) produce much more dross after remelting. It is rather surprising that no dross can be detected in the RSI, but after remelting some parts of apparently ‘healthy’ aluminum can give up to 80% of dross. This raises question how dross gets formed. Recent research proposes that the formation of dross after remelting of the RSI is closely related to the solidification process in the ingot, specifically the formation of shrinkage porosity, hydrogen porosity, and hot tearin
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Kumar, Rajesh S. "Micromechanics Approach for the Overall Elastic Properties of Ceramic Matrix Composites Incorporating Defect Structures." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-16056.

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Abstract Initial mechanical behavior of Ceramic Matrix Composites (CMCs) is linear until the proportional limit. This initial behavior is characterized by linear elastic properties, which are anisotropic due to the orientation and arrangement of fibers in the matrix. The linear elastic properties are needed during various phases of analysis and design of CMC components. CMCs are typically made with ceramic unidirectional or woven fiber preforms embedded in a ceramic matrix formed via various processing routes. The matrix processing of interest in this work is that formed via Polymer Impregnati
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Le Delliou, Patrick, and Sébastien Saillet. "Recent Improvements in Toughness Prediction of Cast Duplex Stainless Steel Components." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93114.

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Abstract Thermal ageing of cast duplex stainless steel components is a concern for long-term operation of EDF nuclear power plants. The thermal ageing embrittlement results from the microstructural evolution of the ferrite phase (spinodal decomposition), and can reduce the fracture toughness properties of the steel. In addition, it is necessary to consider manufacturing quality and the possible occurrence of casting defects such as shrinkage cavities. In a context of life extension, it is important to assess the safety margins to crack initiation and crack propagation instability. One major in
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Lasne, Patrice, Mickael Barbelet, Olivier Jaouen, Frederic Costes, Ihab Ragai, and Harry Tempelman. "Simulation of the Heat Treatment of an Automotive Cast Part." In ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34152.

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In this paper, simulation of the casting and heat treatment processes of front spindle of a rigid dump truck are presented. The objectives are to present how the different operations can be simulated in order to predict the local phases in the different areas of the part. To reach these objectives, two software packages are used in sequenced. The first one, Thercast, is used to simulate the casting operation. The second one, Forge, is applied to the water-quenching simulation. The general formulations used are shortly presented in this paper. The aim of casting simulation is to compute the met
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Sowden, Ike, and George Currier. "Simulating the Effects of Initial Condition Variance in the Investment Casting Process." In 2013 Joint Rail Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/jrc2013-2431.

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A consistent casting process can sometimes be a challenge to achieve due to the wide array of initial conditions that can affect the process. Variation in these initial conditions during the casting process can generate an array of unexpected results, which sometimes have a negative effect on the structural integrity of the castings. Cold shuts, shrinkage formation, and hot tears are just a few examples of the defects that can arise. Throughout the history of the railroad, castings found with these types of defects have plagued the industry. Since castings are considered a leading method for m
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Ramamurthy, Sridhar P., Lyle Steenson, and Zhong Hu. "Computer Simulation of Warpage Formation in Polymer Injection Molding of a Step Pad." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13429.

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Warpage is one of the most common defects of a plastic product in the polymer injection molding process. It is attributed to the differential shrinkage after the part is ejected from the die cavity due to the nonlinear material property of the polymer, improper design of the cooling system, geometry of the part and the related process parameters. In this paper, the warpage formation of a plastic part, Step Pad of polypropylene copolymer, in the cooling stage of the polymer injection molding process was simulated by finite element analysis (FEA). A three-dimensional FEA model, taking into accou
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Johnson, John L., Lye King Tan, Pavan Suri, and Randall M. German. "Metal Injection Molding of Multi-Functional Materials." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41151.

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Metal injection molding (MIM) enables processing of multi-functional components with combinations of properties including, magnetic and non-magnetic; magnetic response and corrosion resistance; controlled porosity and high thermal conductivity; high inertial weight and high strength; high thermal conductivity and low thermal expansion coefficient; wear resistance and high toughness; high thermal conductivity and good glass-to-metal sealing; high elastic modulus and high damping capacity; and magnetic response and electrical resistance. Such materials can be processed by MIM by co-injection mol
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Ligneau, N., C. Page`s, M. Akamatsu, C. Pokor, and V. Calonne-Chatelee. "Integrity and Life Assessment of Cast Duplex Stainless Steel Elbows Used in the Primary Loops of PWRs." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77731.

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Type CF8M cast duplex stainless steels used in the primary loop elbows of PWRs can be affected by thermal aging embrittlement at service temperature, which is around 300°C. This mechanism, resulting from the microstructural evolution of the ferrite, can reduce their fracture toughness properties. In addition, it is necessary to consider manufacturing quality and the possible occurrence of casting defects, such as shrinkage cavities. In a context of life extension, it is important to assess the margins for crack initiation and crack propagation instability. This paper reports the present integr
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