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Keywords: porosity
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Journal Articles
Article Type: Research Papers
J. Manuf. Sci. Eng. May 2021, 143(5): 051004.
Paper No: MANU-20-1326
Published Online: November 11, 2020
... properties. It is shown that an increase in porosity from 49% to 54% during the etching is mainly due to an increase in the number of 100 to 800 μm-diameter pores, from 30% to 50% of them measuring from 100 to 300 μm in size. These changes in the porous structure lead to a significant increase of its...
Journal Articles
Article Type: Research-Article
J. Manuf. Sci. Eng. October 2019, 141(10): 101002.
Paper No: MANU-19-1266
Published Online: July 31, 2019
... during laser scanning. LPBF is a powder bed AM process. Due to the presence of the porosity between the powders, the laser interaction would be different compared with the flat surface. Ye et al. [ 16 ] studied the effect of powder bed thickness on the laser absorptivity, and the results indicated...
Journal Articles
Article Type: Research-Article
J. Manuf. Sci. Eng. July 2019, 141(7): 071004.
Paper No: MANU-19-1032
Published Online: May 14, 2019
...Subin Shrestha; Thomas Starr; Kevin Chou Porosity is an inherent attribute in selective laser melting (SLM) and profoundly degrades the build part quality and its performance. This study attempts to understand and characterize the keyhole pores formed during single-track scanning in SLM. First, 24...
Journal Articles
Article Type: Research-Article
J. Manuf. Sci. Eng. May 2019, 141(5): 051004.
Paper No: MANU-17-1554
Published Online: March 28, 2019
...Petr Hermanek; Filippo Zanini; Simone Carmignato Manufacturing technologies deliver products that can suffer from various defects, one of which is internal porosity. Pores are present in most of the parts produced by, e.g., casting, additive manufacturing, and injection molding and can...
Journal Articles
Article Type: Research-Article
J. Manuf. Sci. Eng. March 2019, 141(3): 031011.
Paper No: MANU-18-1392
Published Online: January 25, 2019
... porosity distribution over the spatial domain of the laminate. References [1] Ghiorse , S. R. , 1993 , “ Effect of Void Content on the Mechanical Properties of Carbon/Epoxy Laminates ,” SAMPE Q. , 24 ( 2 ), pp. 54 – 59 . [2] Niaki , S. A. , Forghani , A. , Vaziri , R...
Journal Articles
Article Type: Research-Article
J. Manuf. Sci. Eng. March 2017, 139(3): 031015.
Paper No: MANU-16-1443
Published Online: October 6, 2016
... to fabricate porous structures. However, these methods can only fabricate simple geometries. In recent years, many studies have been done to use additive manufacturing (AM), e.g., stereolithography apparatus (SLA), in the fabrication of porous structure; however, the porosity that can be achieved is relatively...
Journal Articles
Article Type: Research-Article
J. Manuf. Sci. Eng. April 2015, 137(2): 021011.
Paper No: MANU-14-1387
Published Online: April 1, 2015
... online December 12, 2014. Assoc. Editor: Wayne Cai. 15 07 2014 12 10 2014 12 12 2014 An investigation is reported on the characteristics of porosity formation in high power disk laser welding of AC-170PX (AA6014) alloy sheets (coated with titanium and zirconium) in two weld...
Journal Articles
Article Type: Research Papers
J. Manuf. Sci. Eng. December 2011, 133(6): 061006.
Published Online: December 1, 2011
... a regular matrix of interconnecting pores, high strength, and high porosity. Manufacturing difficulties encourage the application of stamping and forming technologies to increase CVD reactor throughput and reduce materials wastes. In this study, the formability of TM was evaluated using a novel camera-based...
Journal Articles
Article Type: Research Papers
J. Manuf. Sci. Eng. April 2011, 133(2): 021011.
Published Online: March 15, 2011
... is inelastic, dissipative force exits, leading to energy loss in every collision. The interparticle contact force is calculated based on the nonlinear Hertz theory. The packing structures quantified by porosity and the coordination number under different particle size distributions are discussed...
Journal Articles
Article Type: Research Papers
J. Manuf. Sci. Eng. October 2010, 132(5): 051011.
Published Online: October 4, 2010
...J. J. Hernández-Ortega; R. Zamora; J. Palacios; J. López; F. Faura One of the most important problems encountered in die-casting processes is porosity due to air entrapment in the molten metal during the injection process. The aim of this work is to study experimentally and numerically...
Journal Articles
Article Type: Research Papers
J. Manuf. Sci. Eng. October 2009, 131(5): 051008.
Published Online: September 8, 2009
... of the layer. They were systematically sensitive to both the powder material composition and the process parameters. 25 11 2008 18 05 2009 08 09 2009 coating techniques computerised tomography laser beam applications optical microscopy porosity rapid prototyping (industrial...
Journal Articles
Article Type: Technical Briefs
J. Manuf. Sci. Eng. June 2009, 131(3): 034501.
Published Online: April 30, 2009
...M. G. Li; X. Y. Tian; X. B. Chen Dispensing technique is one of the promising solid freeform (SFF) methods to fabricate scaffolds with controllable pore sizes and porosities. In this paper, a model to represent the dispensing-based SFF fabrication process is developed. Specifically, the mechanical...
Journal Articles
Article Type: Research Papers
J. Manuf. Sci. Eng. October 2008, 130(5): 051009.
Published Online: August 15, 2008
...R. Zamora; J. J. Hernandez-Ortega; F. Faura; J. Lopez; J. Hernandez The air entrapment mechanisms in die-casting injection chambers that may produce porosity in manufactured parts are analyzed in this work using visualization techniques of the flow in a transparent injection chamber model, using...
Journal Articles
Article Type: Research Papers
J. Manuf. Sci. Eng. August 2008, 130(4): 041002.
Published Online: July 8, 2008
... underneath, laser scanning velocity, and initial porosity on the sintering process are investigated. The fabrication of the functional part relies on a layer-by-layer SLS process. The newly sintered layer should integrate tightly with the existing layers underneath for strong mechanical properties...
Journal Articles
Article Type: Special Section: Micromanufacturing
J. Manuf. Sci. Eng. June 2008, 130(3): 031103.
Published Online: May 5, 2008
... consolidation strength and porosity were investigated. In addition, the achievable aspect ratio and taper angle were also discussed. 28 05 2007 09 03 2008 05 05 2008 compaction heat transfer hot working mass production porosity powders productivity sintering temperature...
Journal Articles
Article Type: Technical Papers
J. Manuf. Sci. Eng. December 2007, 129(6): 1028–1034.
Published Online: March 13, 2007
... diagram. The ferritic and martensitic transformation as well as austenitization and tempering of martensite are considered. The influence of processing parameters such as laser power and traverse speed on the phase transformation and the consequent hardness are analyzed. The potential presence of porosity...
Journal Articles
Article Type: Technical Papers
J. Manuf. Sci. Eng. August 2006, 128(3): 691–696.
Published Online: December 29, 2005
... reversible martensite-austenite transformation peaks that are the prerequisite for the shape memory effect (SME) in SMAs. DSC has also shown that quenching affects the peaks. The density of the produced parts was close to the theoretical density of the material as determined by porosity measurements. Finally...
Journal Articles
Article Type: Technical Papers
J. Manuf. Sci. Eng. August 2005, 127(3): 670–676.
Published Online: August 5, 2004
... location and flow time data was derived. This approach was validated by both simulation and experimental studies. The results show that by using this method, permeability values of different fiber mat types or the relationship between permeability and fiber volume fraction (porosity) can be obtained...
Journal Articles
Article Type: Technical Papers
J. Manuf. Sci. Eng. February 2004, 126(1): 25–32.
Published Online: March 18, 2004
... from engineering to manufacturing for evaluation. More specifically, by using the method, metallurgical microstructure of cast aluminum alloy is analyzed by dividing cylinder head into such domains as lower deck, middle and upper deck parts for mechanical properties and a casting defect of porosity...
Journal Articles
Article Type: Technical Papers
J. Manuf. Sci. Eng. February 2004, 126(1): 74–82.
Published Online: March 18, 2004
... model with evolving porosity and Cockcroft-Latham with damage in terms of plastic work. The 3D model predictions are compared with predictions from 2D models to understand the limitations of 2D simulations in predicting the stresses, strains and evolving damage in the rolled strip. The phenomenon...