Cyclic Fracture Analysis of Semi-Natural Cast Iron Plate with Metallurgical Defects Layer

2010 ◽  
Vol 165 ◽  
pp. 61-65
Author(s):  
Marius Gutauskas ◽  
Jonas Bacevičius ◽  
Mindaugas Kazimieras Leonavičius
Keyword(s):  
Cast Iron ◽  
Cyclic Load ◽  
Fracture Process ◽  
Crack Formation ◽  
Fracture Analysis ◽  
Electronic Microscopy ◽  
Pure Bending ◽  
Iron Plate ◽  
Metallurgical Defects ◽  
Total Fracture

Fatigue fracture of the semi-natural cast iron plate with dross and carbon float defects was analyzed. Crack formation and propagation were traced under the programmable cyclic load of the pure bending. The focuses of the crack and their consistent pattern up to the total fracture were determined. Fracture analysis was performed by using optical and electronic microscopy methods. High-cycle fracture mechanism was established when the number of the cycles exceeded 108. The influence of the microstructure upon fracture process was investigated.

Forming of Brittle Nodular Cast Iron Plate by Laser Thermal Stress

2008 ◽  
Vol 35 (6) ◽  
pp. 937-942
Author(s):  
周益军 Zhou Yijun ◽  
张永康 Zhang Yongkang ◽  
游文明 You Wenming ◽  
尹晨 Yin Chen
Keyword(s):  
Cast Iron ◽  
Thermal Stress ◽  
Nodular Cast Iron ◽  
Iron Plate

scholarly journals Fracture Analysis of α-Quartz Crystals Subjected to Shear Stress

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 870
Author(s):  
Giovanni Martinelli ◽  
Paolo Plescia ◽  
Emanuela Tempesta ◽  
Enrico Paris ◽  
Francesco Gallucci
Keyword(s):  
Shear Stress ◽  
Amorphous Silica ◽  
Morphological Characteristics ◽  
Fracture Analysis ◽  
Stress Rate ◽  
Quartz Crystals ◽  
Fracture Length ◽  
Total Fracture

This study assesses the correlations between the intensity of stress undergone by crystals and the morphological characteristics of particles and fracturing products. The effects of the fractures on the microstructure of quartz are also studied. Alpha quartz, subjected to shear stress, is quickly crushed according to a fracturing sequence, with a total fracture length that is correlated to the stress rate. The shear stress generates a sequence of macro and microstructural events, in particular localized melting phenomena, never highlighted before on quartz and the formation of different polymorphs, such as cristobalite and tridymite together with amorphous silica.

scholarly journals XIV. On the temporary magnetic effect induced in iron bodies by rotation. In a letter to J. F. W. Herschel, Esq. Sec. R. S. by Peter Barlow, F. R. S. Communicated April 14th, 1825

1825 ◽  
Vol 115 ◽  
pp. 317-327 ◽  
Keyword(s):  
Cast Iron ◽  
Magnetic State ◽  
Magnetic Effect ◽  
Rapid Rotation ◽  
Iron Plate ◽  
Permanent Change ◽  
The Subject ◽  
Simple Inversion ◽  
Magnetic Poles

Dear Sir, It is more than two years since, in a conversation I had with you on subjects connected with magnetism, you enquired what effect I thought might result from giving to an iron ball a rapid rotation? The subject however dropped, and it did not occur to me again, till in some speculative views in which I was lately engaged, as to the cause of the rotation of the earth's magnetic poles, the apparent irregularity of the terrestrial directive powers, &c. I was led to consider that, probably, rotation might have a certain influence. We know that iron is rendered magnetic by various processes, as drilling, hammering, &c. and it was possible also by rotation; your query now occurred to my mind; and knowing at the same time that Mr. Christie had found a permanent change in the magnetic state of an iron plate by a mere change of position on its axis, it seemed highly probable this change, due only to a simple inversion, would be increased by a rapid rotation. In this respect, however, I was deceived; for I found afterwards, that all the effect that was produced was merely temporary; and if any permanent change did take place, it was too small in my cast iron shell to be observed with the small compass I employed in these experiments. Being however thus urged to the inquiry, as well by my own speculative views as by your query, and encouraged by Mr. Christie’s results, I resolved to put the idea to the test of experiment, and to attempt it at once upon a scale that should decide the question in the first instance.

Microstructure and tribological properties of gray cast iron specimens coated by aluminizing, boronizing, chromizing and siliconizing

2012 ◽  
Vol 1516 ◽  
pp. 115-120 ◽  
Author(s):  
T. Murakami ◽  
K. Matsuzaki ◽  
Y. Gomi ◽  
S. Sasaki ◽  
H. Inui
Keyword(s):  
Wear Resistance ◽  
Cast Iron ◽  
Tribological Properties ◽  
Gray Cast Iron ◽  
Steel Ball ◽  
Gray Cast ◽  
Iron Plate ◽  
Aisi 52100 ◽  
Alpha Olefin ◽  
Aisi 52100 Steel

ABSTRACTIn this study, aluminized, boronized, chromized and siliconized gray cast iron plate specimens were prepared, and their microstructures and tribological properties were investigated. The surfaces of the aluminized, boronized, chromized and siliconized specimens mainly consisted of FeAl, Fe2B, (Cr, Fe)23C6 and FeSi phases, respectively. Also, the surface of the boronized specimen exhibited the highest microvickers hardness of all the specimens. The aluminized, boronized and chromized specimens exhibited friction coefficients as low as the non-coated specimens when sliding against AISI 52100 steel ball specimens in poly-alpha-olefin. In addition, the boronized and chromized specimens exhibited much higher wear resistance than the non-coated specimens.

On the Mechanics of Grey Cast Iron Under Pure Bending

1986 ◽  
Vol 108 (2) ◽  
pp. 141-146 ◽  
Author(s):  
G. S. A. Shawki ◽  
S. A. R. Naga
Keyword(s):  
Cast Iron ◽  
Bending Strength ◽  
Neutral Axis ◽  
Grey Cast Iron ◽  
Stress And Strain ◽  
Pure Bending ◽  
Rectangular Section ◽  
Bending Strain ◽  
Grey Cast ◽  
Lamellar Graphite

This paper presents the results of experiments conducted on lamellar graphite grey cast iron of rectangular section subjected to pure bending. Strain measurements confirm the traditional speculation that plane sections remain plane under strain. Owing to the nonlinear relationship between stress and strain, however, the neutral axis of a loaded specimen is shown to shift away from the centroidal axis. This shift is evidently amplified with increased loading. A computer program is herein specially devised for calculating the shift in neutral axis through satisfaction of the conditions of equilibrium together with checking for possible crack initiation at the extension side. While the simple flexural formula holds very nearly true for the compression side, it fails, however, to predict stresses on the extension side, the situation being further aggravated by higher bending moments. The apparent high bending strength of grey cast iron is fully accounted for.

scholarly journals Influence of Microscopic Effects on the Static Tensile Strength of Gray Cast Iron HT200 Specimens

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
L. Fan ◽  
H. B. Hu ◽  
X. S. Tang ◽  
J. J. He ◽  
W. Chen
Keyword(s):  
Cast Iron ◽  
Energy Density ◽  
Fracture Process ◽  
Gray Cast Iron ◽  
Static Strength ◽  
Gray Cast ◽  
Zone Model ◽  
Cast Material ◽  
Crack Growth Model ◽  
Density Zone

Gray cast iron HT200 material is a kind of pearlitic gray cast iron. Flake graphite in the gray cast iron greatly destroys the integrity of the matrix and affect the static strength. The influence of microscopic effects on the tensile static strength of gray cast iron HT200 specimens is investigated. The microstructures are observed by the scanning electron microscope. The failure tests are done under the static loads for the cylinder specimens of gray cast iron HT200. Then, an energy density zone (EDZ) model is applied to the simulation of the fracture process of the specimens. The energy density zone model is a macro/micro-trans-scale crack growth model that can depict a fracture process from an initial microdefect at the microscale to the final break at the macroscale. Three scale transitional functions as well as the size of the initial microdefect in the model represent the microscopic effects in a fracture process. Three scale transitional functions are speculated in view of the physical failure mechanisms. Two other material parameters in the model are determined from the test data. Thereby, the fracture process of gray cast iron specimens is numerically simulated, and the static strength values are calculated. The calculated values of static strength of gray cast iron specimens are identical to the test values. It is seen that the energy density zone model can accurately describe a fracture process of brittle materials like gray cast iron. In addition, the calculated results show that the microscopic effects did affect the static strength of gray cast material.

Sign in / Sign up

Export Citation Format

Share Document