Relationship of fracture toughness with the fractographic characteristics of brittle fractures of toughened steel

1989 ◽  
Vol 21 (4) ◽  
pp. 430-435
Author(s):  
A. A. Astaf'ev ◽  
V. M. Goritskii ◽  
G. R. Shneiderov ◽  
A. D. Shur ◽  
V. A. Yukhanov
Keyword(s):  
Fracture Toughness ◽  
Brittle Fractures ◽  
Relationship Of

Effect of Sintering Temperature on Microstructure and Properties of VС/Fe Composite

2012 ◽  
Vol 430-432 ◽  
pp. 978-983
Author(s):  
Guo Jun Zhang ◽  
Zhi Ping Sun ◽  
Li Yan Zou
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Sintering Temperature ◽  
Growth Trend ◽  
Flexure Strength ◽  
Microstructure And Properties ◽  
Whole Process ◽  
Relationship Of ◽  
The Relationship ◽  
Composite Samples

VC/Fe composite samples were fabricated by sintering at 1050, 1100 and 1150°C in vacuum. The microstructure and mechanical properties of samples were examined, and the relationship of structure and mechanical properties for VC/Fe composite sintered at different temperature were studied. The results show that fracture toughness, hardness and density is increasing obviously at 1050-1100°Cwith the increasing sintering temperature, but the growth trend increases slowly at 1100-1150°C; in whole process with temperature increased, Flexure strength heighten trend obviously. The microstructure of VC/Fe composite changed from particles piled up together to the microstructure particles closely, VC particles set gradually into Fe with temperature increased, and the gap reduced gradually.

Microstructure–fracture toughness relationship of vanadium alloy/stainless steel brazed joints

2001 ◽  
Vol 299 (2) ◽  
pp. 157-164 ◽  
Author(s):  
Y.X Gan ◽  
H.A Aglan ◽  
R.V Steward ◽  
B.A Chin ◽  
M.L Grossbeck
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Vanadium Alloy ◽  
Brazed Joints ◽  
Relationship Of

Fracture Toughness Analysis of the China RPV Steel with Miniaturized Specimen

2016 ◽  
Vol 850 ◽  
pp. 41-46 ◽  
Author(s):  
Yun Lin ◽  
Wen Yang ◽  
Zhen Feng Tong ◽  
Guang Sheng Ning
Keyword(s):  
Fracture Toughness ◽  
Nuclear Power ◽  
Master Curve ◽  
Initiation Site ◽  
Cleavage Crack ◽  
Test Technique ◽  
Rpv Steel ◽  
Specimen Test ◽  
Relationship Of ◽  
The Relationship

Reactor pressurized vessel (RPV), which determines the lifetime of the nuclear power plant (NPP), is mainly forged using A508-3 steel in China. In order to meet the requirement of the small specimen test technique in the nuclear application, the fracture toughness of A508-3 steel was tested under-100°C using 1/4 CT specimens, and analyzed using Master Curve according to ASTM E 1921. In this work, the relationship of the KIC and the distance between the cleavage crack initiation site and the front of the fatigue crack is studied, and the transition temperature T0 of A508-3 is-98.7 oC, which is quite close to the test temperature.

Microstructure and Physical Properties of CaF2–MgO Eutectics Produced by the Bridgman Method

2000 ◽  
Vol 15 (6) ◽  
pp. 1314-1319 ◽  
Author(s):  
A. Larrea ◽  
L. Contreras ◽  
R. I. Merino ◽  
J. Llorca ◽  
V. M. Orera
Keyword(s):  
Electron Microscopy ◽  
Fracture Toughness ◽  
Crack Deflection ◽  
Low Energy ◽  
Optical Applications ◽  
Potential Improvement ◽  
Oriented Parallel ◽  
Crystallographic Orientation Relationship ◽  
Relationship Of ◽  
First Time

The microstructure and crystallographic orientation relationship of CaF2–MgO eutectics produced for the first time were characterized by electron microscopy. The eutectic contains single-crystal MgO rods (∼0.7 μm in size, spaced ∼8 μm) oriented parallel to the cubic axis of a CaF2 matrix. The rods present low-energy {100}CaF2 //{111}MgO interfaces. Light guiding was experimentally proved and considered for possible optical applications. Crack propagation was also studied to show the potential improvement in fracture toughness through crack deflection at the interfaces.

scholarly journals Acoustic Emission-Based Study to Characterize the Crack Initiation Point of Wood Fiber/HDPE Composites

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 701 ◽  
Author(s):  
Yong Guo ◽  
Shiliu Zhu ◽  
Yuxia Chen ◽  
Dian Liu ◽  
Dagang Li
Keyword(s):  
Fracture Toughness ◽  
Acoustic Emission ◽  
Crack Initiation ◽  
Wood Fiber ◽  
Critical Stress Intensity Factor ◽  
Vital Role ◽  
The Novel ◽  
Initiation Point ◽  
Composite Failure ◽  
Relationship Of

The crack initiation point can be regarded as a sign of composite failure and plays a vital role in the evaluation of fracture toughness. Wood-plastic composites (WPCs) are viscoelastic materials and the evaluation of fracture mechanism and toughness has a great significance in their applications. Therefore, we used the acoustic emission (AE) technique to measure the crack initiation point of the WPCs and evaluate their fracture toughness. The results show that the novel AE-based methods were more effective than the conventional standard methods for characterization of the crack initiation point. Using the relationship of cumulative AE events with time and load, the critical failure load was quickly determined, and then the critical stress intensity factor and fracture toughness were calculated. The fracture toughness of the WPCs increased with an increase in the wood fiber content.

Effect of Holding Time on Microstructure and Properties of VC/Fe Composite

2012 ◽  
Vol 723 ◽  
pp. 353-357
Author(s):  
Guo Jun Zhang ◽  
Zhi Ping Sun ◽  
Li Yan Zou
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Relative Density ◽  
Bending Strength ◽  
Holding Time ◽  
Microstructure And Properties ◽  
Microstructure And Mechanical Properties ◽  
Relationship Of ◽  
The Relationship ◽  
Better Than

The microstructure and mechanical properties of samples were examined, and the relationship of structure and mechanical properties for VC/Fe composite sintered at different holding time were studied. Holding time can influence the mechanical properties, with the holding time rising, when the holding time is 80 min, the hardness is Max, it’s 10.71 GPa, the enhancing range is 37.66%; The relative density changes slower from 60 to 100 min; when the holding time is 60 minutes, fracture toughness and bending strength of material is 16.17 MPa•m 1/2 and 1070 MPa, it’s better than before.

Bridging Toughening Mechanism of Fiber Eutectics and Transformation Particles Composite Ceramic

2010 ◽  
Vol 177 ◽  
pp. 178-181 ◽  
Author(s):  
Xin Hua Ni ◽  
Xie Quan Liu ◽  
Bao Hong Han ◽  
Guo Hui Zhong ◽  
Tao Sun
Keyword(s):  
Fracture Toughness ◽  
Volume Fraction ◽  
Composite Ceramic ◽  
Diameter Ratio ◽  
Interface Bonding ◽  
Toughening Mechanism ◽  
Random Orientation ◽  
Relationship Of ◽  
Interface Bonding Strength ◽  
The Relationship

Based on the microstructure of fiber eutectics and transformation particles composite ceramic, the bridging stress of the fiber eutectic is determined. The bridging load that makes crack closure to reduce the stress concentration of crack tip is calculated. The energy dissipative value of the bridging load is obtained by considering the random orientation of the fiber eutectic. Finally, according to the relationship of the fracture toughness and energy dissipation, the bridging toughening mechanism is established. Analysis shows that the bridging toughening value is enhanced with the increasing of volume fraction and fracture strength of fiber eutectic, and enhanced with the decreasing of interface bonding strength and length-diameter ratio.

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