<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The influence of Tvergaard's parameters <italic>qi</italic> of Gurson-Tvergaard-Needleman (GTN) material model on S235JR steel response was considered in the study. The analysis concerns the strength curves simulated numerically for notched tensile elements under static tension in complex stress state defined by high initial stress triaxiality σ<italic>m</italic>/σ<italic>e</italic> > 1. Typical and material-dependent values of Tvergaard's parameters <italic>qi</italic> were examined. The influence of the Tvergaard's parameters <italic>qi</italic> on material response was noticed at the failure range for S235JR steel in the case of high stress triaxiality.</abstract>

The analysis of influence of Tvergaard's parameters on S235JR steel response in high stress triaxiality

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">In the present work, the electrodeposition of iron-nickel-molybdenum (Fe-Ni-Mo) alloy on n-type silicon (Si) is investigated. A voltamperometric study has been carried out. According to the composition of the solution and of its pH, the properties of final deposit have been investigated and analyzed by X-rays diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). Under our conditions an amorphous FeNiMo alloy was formed. The morphology of deposited layer was strongly influenced by the polarization and the molybdenum dominance in the final chemical composition of the deposited film. Moreover, high percentages of molybdenum can be obtained from high molybdate concentrations and grain size increase with increasing Mo concentration. We also noticed that an absence of nickel was accomplished by applying more negative potential.</abstract>

U.D.T.S., 2Bd Frantz-Fanon, B.P. 140, 7merveilles Algiers, Algeria

U.R.M.E.R Abou, Baker Belkaid University, B.p: 119 Tlemcen 13000, Algeria

The iron-nickel-molybdenum (Fe-Ni-Mo) electrodeposited alloy on n-type silicon

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">Aerogels are internally nanostructured materials characterized with a plethora of unique properties. Monoliths with high optical transparency made of silica aerogels were some of the first and still one of the most important classes of aerogels. Experiments and theory indicate that optical transparency and structural integrity of silica aerogels are negatively correlated. Other than optimal combination of processing conditions during aerogel fabrication can result in either highly transparent but cracked or in crack-free but less transparent and even opaque aerogels monoliths. Results are presented from the study of the relationship between the properties of single-step tetramethoxysilane (TMOS) base-catalyzed silica aerogels and the processing conditions, both at the alcogel preparation step and during the supercritical liquid CO2 drying process. Crack-free aerogel monoliths with good optical transparency were obtained with TMOS:methanol (MeOH) molar ratios of 1:16 and TMOS:ammonia (NH4OH) molar ratios of 1:0.05, CO2-MeOH exchange rates of about 1.25 ml/min, and autoclave decompression rates of 70 KPa/min. Adding glycerol in the sol-gel stage had a positive effect on the aerogel monolithicity but, even without glycerol, crack-free silica aerogels can be obtained by reducing the depressurization rate of the autoclave. A strict control and careful selection of the aerogel's processing conditions within the set of parameters identified will enable the fabrication of structurally sound silica aerogels with good optical properties essential for a number of applications.</abstract>

Optically transparent and structurally sound silica aerogels: insights from a process study

AHEAD OF PRINT

Volume 24 (2024): Issue 1 (March 2024)

Volume 23 (2023): Issue 4 (December 2023)

Volume 23 (2023): Issue 3 (September 2023)

Volume 23 (2023): Issue 2 (June 2023)

Volume 23 (2023): Issue 1 (March 2023)

Volume 22 (2022): Issue 4 (December 2022)

Volume 22 (2022): Issue 3 (September 2022)

Volume 22 (2022): Issue 2 (June 2022)

Volume 22 (2022): Issue 1 (March 2022)

Volume 21 (2021): Issue 4 (December 2021)

Volume 21 (2021): Issue 3 (September 2021)

Volume 21 (2021): Issue 2 (June 2021)

Volume 21 (2021): Issue 1 (March 2021)

Volume 20 (2020): Issue 4 (December 2020)

Volume 20 (2020): Issue 3 (September 2020)

Volume 20 (2020): Issue 2 (June 2020)

Volume 20 (2020): Issue 1 (March 2020)

Volume 19 (2019): Issue 4 (December 2019)

Volume 19 (2019): Issue 3 (September 2019)

Volume 19 (2019): Issue 2 (June 2019)

Volume 19 (2019): Issue 1 (March 2019)

Volume 18 (2018): Issue 4 (December 2018)

Volume 18 (2018): Issue 3 (September 2018)

Volume 18 (2018): Issue 2 (June 2018)

Volume 18 (2018): Issue 1 (March 2018)

Volume 17 (2017): Issue 4 (December 2017)

Volume 17 (2017): Issue 3 (September 2017)

Volume 17 (2017): Issue 2 (June 2017)

Volume 17 (2017): Issue 1 (March 2017)

Volume 16 (2016): Issue 4 (December 2016)

Volume 16 (2016): Issue 3 (September 2016)

Volume 16 (2016): Issue 2 (June 2016)

Volume 16 (2016): Issue 1 (March 2016)

Volume 15 (2015): Issue 4 (December 2015)

Volume 15 (2015): Issue 3 (September 2015)

Volume 15 (2015): Issue 2 (June 2015)

Volume 15 (2015): Issue 1 (March 2015)

Volume 14 (2014): Issue 4 (December 2014)

Volume 14 (2014): Issue 3 (October 2014)

Volume 14 (2014): Issue 2 (June 2014)

Volume 14 (2014): Issue 1 (March 2014)

Volume 13 (2013): Issue 4 (December 2013)

Volume 13 (2013): Issue 3 (September 2013)

Volume 13 (2013): Issue 2 (June 2013)

Volume 13 (2013): Issue 1 (March 2013)

Volume 12 (2013): Issue 4 (January 2013)

Volume 12 (2012): Issue 3 (October 2012)

Volume 12 (2012): Issue 2 (June 2012)

Volume 12 (2012): Issue 1 (March 2012)

Volume 11 (2011): Issue 4 (December 2011)

Volume 11 (2011): Issue 3 (September 2011)

Volume 11 (2011): Issue 2 (June 2011)

Volume 11 (2011): Issue 1 (March 2011)

Volume 10 (2010): Issue 4 (December 2010)

Volume 10 (2010): Issue 3 (September 2010)

Volume 10 (2010): Issue 2 (June 2010)

Volume 10 (2010): Issue 1 (March 2010)

Volume 9 (2009): Issue 4 (December 2009)

Volume 9 (2009): Issue 3 (September 2009)

Volume 9 (2009): Issue 2 (June 2009)

Volume 9 (2009): Issue 1 (March 2009)

Volume 8 (2008): Issue 4 (December 2008)

Volume 8 (2008): Issue 3 (September 2008)

Volume 8 (2008): Issue 2 (June 2008)

Volume 8 (2008): Issue 1 (March 2008)

Advances in Materials Science

The journal is primarily focused on structure-properties relationship of engineering materials. Research articles addressing the following issues can be published as unique contributions across a variety of topics, including, but not limited to:   Structural and functional materials (metals and alloys, ceramics, polymers, composites)  Nanomaterials  Biomaterials  Materials for electronics  Materials for marine industry  Materials for energy industry  Materials for buildings  Surfaces, interfaces and thin films  Design, synthesis, processing and characterization techniques  Manufacturing of materials  Mechanics of materials  Stress analysis  Modeling of properties of materials  Methodology of testing the structure and properties of materials   The journal publishes original research articles and review articles. The possibility of publishing review articles should be agreed with the editors of the journal prior to submission.   Why subscribe and read   Internationally recognized source of up-to-date materials science information showing the newest achievements in area of structural and functional materials.  Why submit   A quick, reliable and constructive review  Short publication time  High quality electronic publication technologies  Open access   Rejection Rate   53%  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 

Advances in Materials Science

Volume 12 (2012): Issue 1 (March 2012)

The analysis of influence of Tvergaard's parameters on S235JR steel response in high stress triaxiality

The iron-nickel-molybdenum (Fe-Ni-Mo) electrodeposited alloy on n-type silicon

Optically transparent and structurally sound silica aerogels: insights from a process study

Chercher

Tous les volumes et éditions dans cette revue