Stress Characterization of Bore-Chilled Sand Cast Aluminum Engine Blocks in As-Cast and T7 Condition with Application of Neutron Diffraction

2020 ◽  
pp. 153-157
Author(s):  
J. Stroh ◽  
D. Sediako ◽  
G. Byczynski ◽  
A. Lombardi ◽  
A. Paradowska
Keyword(s):  
Neutron Diffraction ◽  
Cast Aluminum ◽  
Sand Cast ◽  
Engine Blocks

Evolution of Residual Stress Through The Processing Stages in Manufacturing of Bore-Chilled Sand-Cast Aluminum Engine Blocks With Pressed-In Iron Liners

2021 ◽  
Author(s):  
Joshua Stroh ◽  
Dimitry Sediako ◽  
Anthony Lombardi ◽  
Glenn Byczynski ◽  
Mark Reid ◽  
...  
Keyword(s):  
Residual Stress ◽  
Combustion Engine ◽  
Casting Process ◽  
Operating Pressure ◽  
Cast Aluminum ◽  
Sand Cast ◽  
Press Fit ◽  
Stress Mode ◽  
Engine Blocks ◽  
Cylinder Liners

Abstract The cumulative global emissions produced by the automotive industry over the last decade has put a tremendous strain on the environment. Consequently, automotive engineers and manufacturers have been forced to improve the efficiencies of their automobiles which is frequently accomplished by increasing the operating pressure, and therefore temperature, of the combustion engine. Unfortunately, in addition to the rise in operational pressures and temperatures, large tensile residual stresses often accumulate in the cylinder bridges during the casting process of aluminum engine blocks due to the use of cast-in iron cylinder liners, leading to combined stress magnitudes above the strength of the currently used aluminum alloys. Thus, the present study aims to characterize the evolution of residual stress, with application of neutron diffraction, at several critical stages of the manufacturing process of sand-cast aluminum engine blocks that have eliminated the iron cylinder liners from the casting process and replaced them with cylinder bore chills that are pressed-out after the thermal sand reclamation process. The replacement of the iron liners shifted the stress mode from purely tension to purely compression until the bore chills were removed. Following removal of the bore chills, the maximum tensile stress at the top of the cylinder bridge was ~70% lower than the engine’s predecessor which was produced with iron liners. Moreover, in the production-ready state (i.e., T7 heat treated, machined and press-fit liners inserted), the stress mode maintains the partially compressive nature with low magnitudes of tension, thereby lowering the material’s susceptibility to crack growth and propagation.

Structural, electrical characterization and oxygen-diffusion paths in LaSrGa1-xMgxO4-δ (x=0.0-0.2) layered perovskites: an impedance spectroscopy and neutron diffraction study

2021 ◽  
Author(s):  
Carlos Marino ◽  
Juan Basbus ◽  
Ana L. Larralde ◽  
Jose Antonio Alonso ◽  
Maria Teresa Fernandez-Diaz ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Neutron Diffraction ◽  
Structural Characterization ◽  
Oxygen Diffusion ◽  
Electrical Characterization ◽  
Neutron Diffraction Study ◽  
Oxygen Ions ◽  
Diffusion Paths ◽  
Layered Perovskites

This work presents the results of the structural characterization of LaSrGa1-xMgxO4-δ oxides with x=0.0-0.2 (LSGM'); these oxides with layered K2NiF4-type structure are potential electrolytes of oxygen ions with applications in...

Magnetic structural characterization of Mg–Co–Cr ferrite by neutron diffraction

2007 ◽  
Vol 310 (2) ◽  
pp. 2722-2724 ◽  
Author(s):  
S.M. Yunus ◽  
Hiroki Yamauchi ◽  
A.K.M. Zakaria ◽  
Naoki Igawa ◽  
Akinori Hoshikawa ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Structural Characterization

Neutron diffraction characterization of Japanese artworks of Tokugawa age

2009 ◽  
Vol 395 (7) ◽  
pp. 1961-1968 ◽  
Author(s):  
F. Grazzi ◽  
L. Bartoli ◽  
F. Civita ◽  
M. Zoppi
Keyword(s):  
Neutron Diffraction

ChemInform Abstract: Characterization of the Cotunnite-Type Phases of Zirconia and Hafnia by Neutron Diffraction and Raman Spectroscopy.

ChemInform ◽  
2010 ◽  
Vol 28 (42) ◽  
pp. no-no
Author(s):  
J. HAINES ◽  
J. M. LEGER ◽  
S. HULL ◽  
J. P. PETITET ◽  
A. S. PEREIRA ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Neutron Diffraction ◽  
Abstract Characterization

scholarly journals Structural Characterization of Natural Yeast Phosphatidylcholine and Bacterial Phosphatidylglycerol Lipid Multilayers by Neutron Diffraction

2021 ◽  
Vol 9 ◽  
Author(s):  
Alessandra Luchini ◽  
Giacomo Corucci ◽  
Krishna Chaithanya Batchu ◽  
Valerie Laux ◽  
Michael Haertlein ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Acyl Chain ◽  
Model Systems ◽  
Head Group ◽  
Single Class ◽  
Lipid Mixtures ◽  
Chain Composition ◽  
Acyl Chain Composition ◽  
The Impact

Eukaryotic and prokaryotic cell membranes are difficult to characterize directly with biophysical methods. Membrane model systems, that include fewer molecular species, are therefore often used to reproduce their fundamental chemical and physical properties. In this context, natural lipid mixtures directly extracted from cells are a valuable resource to produce advanced models of biological membranes for biophysical investigations and for the development of drug testing platforms. In this study we focused on single phospholipid classes, i.e. Pichia pastoris phosphatidylcholine (PC) and Escherichia coli phosphatidylglycerol (PG) lipids. These lipids were characterized by a different distribution of their respective acyl chain lengths and number of unsaturations. We produced both hydrogenous and deuterated lipid mixtures. Neutron diffraction experiments at different relative humidities were performed to characterize multilayers from these lipids and investigate the impact of the acyl chain composition on the structural organization. The novelty of this work resides in the use of natural extracts with a single class head-group and a mixture of chain compositions coming from yeast or bacterial cells. The characterization of the PC and PG multilayers showed that, as a consequence of the heterogeneity of their acyl chain composition, different lamellar phases are formed.

scholarly journals In situ characterization of energy materials by neutron diffraction

2017 ◽  
Vol 73 (a2) ◽  
pp. C129-C129
Author(s):  
Jose Antonio Alonso ◽  
Vanessa Cascos ◽  
Ruben Martinez-Coronado ◽  
Chunwen Sun ◽  
Carlos Lopez ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Energy Materials ◽  
In Situ Characterization
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