Influence of temperature rise at the crack tip on crack bifurcation

1984 ◽  
Vol 24 (1) ◽  
pp. R23-R32 ◽  
Author(s):  
V. G. Ukadgaonker ◽  
S. K. Chadda ◽  
S. K. Maiti
Keyword(s):  
Temperature Rise ◽  
Crack Tip ◽  
Influence Of Temperature ◽  
Crack Bifurcation

Influence of Temperature on the Densification and Lattice Parameters of Sialon Ceramic

2011 ◽  
Vol 335-336 ◽  
pp. 678-682
Author(s):  
Zhu Xing Tang ◽  
He Zhang ◽  
Hui Hui Tan ◽  
Xia Zhao
Keyword(s):  
Temperature Rise ◽  
Sintering Temperature ◽  
Lattice Parameters ◽  
Experimental Results ◽  
Sintering Behavior ◽  
Influence Of Temperature ◽  
Sialon Ceramic ◽  
Sintering Additive ◽  
Influence Of Temperature On ◽  
Z Value

The sintering behavior and lattice parameters of β-sialon were investigated by varying temperature, z values and the amounts of sintering additive composed of Y2O3. The experimental results indicated that the z value of β-sialon decreases with the sintering temperature increases. The sinterability of the β-sialon declined with the z values increase . As the sintering temperature rise the phenomenon of anti-densification was occurred when the amount of additive was 7wt%.

Study on the Influence of the Temperature Rise and Frictional Coefficient of Brake Shoe on Braking of Wind Turbine

2012 ◽  
Vol 443-444 ◽  
pp. 1045-1049 ◽  
Author(s):  
Zhi Jie Wang ◽  
San Ming Liu ◽  
Lin Lin Luan ◽  
Hua Qiao Xiao
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Wind Turbine ◽  
Temperature Rise ◽  
High Speed ◽  
Frictional Coefficient ◽  
Brake Shoe ◽  
Influence Of Temperature ◽  
Input And Output ◽  
Mine Hoist

The value of brake friction coefficient have to do with temperature rises、speed、press and the influence of temperature rise is most large.Because high speed mine hoist come into being high temperature in apply the brake，it affect friction coefficient and capability of apply the brake system. therefore，unfold study brake temperature rise and friction coefficient forecast is very importance meaning.Because ANN can reflect non-line relation of input and output，this paper puts forward description mapping relation and effect to apply the brake safety of with temperature rises、speed、press and the influence.

scholarly journals Influence of temperature rise by 2.5°C on the increase of apoptosis of HL-60 cells treated with busulfan

2019 ◽  
Vol 28 (5) ◽  
pp. 581-585
Author(s):  
Dariusz Sztafrowski ◽  
Bożena Jaźwiec ◽  
Kazimierz Kuliczkowski
Keyword(s):  
Temperature Rise ◽  
Influence Of Temperature

scholarly journals Effects of HfC Particles on Crack Initiation and Propagation Behavior of WC/Co Composites

2019 ◽  
Vol 37 (3) ◽  
pp. 628-635
Author(s):  
Xinyu Yan ◽  
Shouren Wang ◽  
Daosheng Wen ◽  
Gaoqi Wang ◽  
Wentao Liu
Keyword(s):  
Fracture Toughness ◽  
Crack Propagation ◽  
Bending Strength ◽  
Crack Tip ◽  
Crack Deflection ◽  
Simulation Software ◽  
Homogeneous Distribution ◽  
The Matrix ◽  
Crack Pinning ◽  
Crack Bifurcation

Tungsten carbide composites were prepared by cold-pressing and hot-pressing sintering; fracture toughness and bending strength of the specimens were tested. The microstructures of HfC/WC/Co composites were observed with the SEM. The mathematical models were established to investigate the relationship between stress intensity factors of crack straight-through, crack deflection, and crack bifurcation with crack length, based on the crack propagation energy release rate. The simulation software ABAQUS was used to verify the four crack propagation methods of crack straight-through, crack deflection, crack bifurcation and crack pinning. The simulation results show that adding appropriate amount of HfC can effectively improve the fracture toughness and bending strength of the composites. The homogeneous distribution of HfC and Co in the matrix has a significant effect on the improvement of the strength and toughness of the composites, and the improvement mechanism is to disperse or transfer the stress at the crack tip to HfC by crack deflection, crack bifurcation, crack pinning, transcrystalline fracture, etc. As a result, the stress concentration at the crack tip in the matrix is reduced, and the toughness of the composites is improved.

scholarly journals Antioxidative Defense and Fertility Rate in the Assessment of Reprotoxicity Risk Posed by Global Warming

Antioxidants ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 622 ◽  
Author(s):  
Costantino Parisi ◽  
Giulia Guerriero
Keyword(s):  
Global Warming ◽  
Data Analysis ◽  
Temperature Rise ◽  
Temperature Fluctuation ◽  
Recent Progress ◽  
Fertility Rate ◽  
Antioxidative Defense ◽  
Influence Of Temperature ◽  
Animal Data ◽  
Report Data

The objective of this review is to briefly summarize the recent progress in studies done on the assessment of reprotoxicity risk posed by global warming for the foundation of strategic tool in ecosystem-based adaptation. The selected animal data analysis that was used in this paper focuses on antioxidative markers and fertility rate estimated over the period 2000–2019. We followed a phylogenetic methodology in order to report data on a panel of selected organisms that show dangerous effects. The oxidative damage studies related to temperature fluctuation occurring in biosentinels of different invertebrate and vertebrate classes show a consistently maintained physiological defense. Furthermore, the results from homeothermic and poikilothermic species in our study highlight the influence of temperature rise on reprotoxicity.

The influence of temperature rise on silage.

1953 ◽  
Vol 1 (3) ◽  
pp. 186-187
Author(s):  
J.C. De Man
Keyword(s):  
Lactic Acid ◽  
Butyric Acid ◽  
Temperature Rise ◽  
Deleterious Effect ◽  
Influence Of Temperature

Cut and crushed grass samples were separately ensiled in preserving jars and kept either at 35 degrees C. for one week and subsequently at 20 degrees C. for 6 months or at 20 degrees C. throughout. Maintaining silage at 35 degrees C. for one week stimulated the formation of butyric acid and restricted the formation of lactic acid. In another experiment jars were held at 35 degrees C. for periods varying from 1 to 8 days. Silage deteriorated after 1 day at 35 degrees C. The deleterious effect of keeping silage at 35 degrees C. was less pronounced in the case of crushed than in the case of cut grass.-W.J.B. (Abstract retrieved from CAB Abstracts by CABI’s permission)

Two Analytical Solutions for Dynamic Crack Bifurcation in Antiplane Strain

1982 ◽  
Vol 49 (2) ◽  
pp. 366-370 ◽  
Author(s):  
P. Burgers ◽  
J. P. Dempsey
Keyword(s):  
Stress Intensity ◽  
Conformal Mapping ◽  
Crack Tip ◽  
Dynamic Crack ◽  
Antiplane Strain ◽  
Intensity Factors ◽  
Mode Iii ◽  
Constant Magnitude ◽  
Tip Velocity ◽  
Crack Bifurcation

A semi-infinite crack is subjected to constant magnitude, dynamic antiplane loading at time t = 0. At the same instant the crack is assumed to bifurcate and propagate normal to its original plane or to propagate without branching. For constant crack-tip velocities the stresses and particle velocity are functions of r/t and θ only, which allows Chaplygin’s transformaton and conformal mapping to be used to obtain two Riemann-Hilbert problems which can be solved analytically. Expressions for the elastodynamic Mode III stress-intensity factors are then computed as functions of the crack-tip velocity and some conclusions concerning crack initiation are drawn.

Plastic Dissipation and Temperature Field around a Steady Running Crack

2006 ◽  
Vol 324-325 ◽  
pp. 895-898
Author(s):  
Wen Bo Luo ◽  
Ting Qing Yang
Keyword(s):  
Temperature Field ◽  
Heat Source ◽  
Plastic Zone ◽  
Temperature Rise ◽  
Heat Dissipation ◽  
Crack Tip ◽  
Maximum Temperature ◽  
Growth Speed ◽  
Density Distribution Function ◽  
Plastic Dissipation

Temperature field is formed due to heat dissipation when material is subjected to irreversible deformation. In this paper, the heat dissipation in the crack-tip plastic zone was considered. By considering the propagating crack-tip plastic zone as a running heat source and constructing a reasonable heat source density distribution function, the temperature field around a steady running crack was obtained. It is shown that temperature rise is dependent on the crack growth speed and the material parameters. The maximum temperature rise reaches to >50 oC in our example calculations for a steady running crack in PMMA.

Influence of temperature rise on the recovery capacity of Mytilus galloprovincialis exposed to mercury pollution

2018 ◽  
Vol 93 ◽  
pp. 1060-1069 ◽  
Author(s):  
Francesca Coppola ◽  
Bruno Henriques ◽  
Amadeu M.V.M. Soares ◽  
Etelvina Figueira ◽  
Eduarda Pereira ◽  
...  
Keyword(s):  
Temperature Rise ◽  
Mytilus Galloprovincialis ◽  
Mercury Pollution ◽  
Influence Of Temperature ◽  
Recovery Capacity
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