Fracture Properties of Epoxy Asphalt Mixture

2009 ◽  
Vol 417-418 ◽  
pp. 917-920
Author(s):  
Xian Hua Chen ◽  
Hong Tao Li ◽  
Zhen Dong Qian
Keyword(s):  
Fracture Toughness ◽  
Fracture Resistance ◽  
Asphalt Mixture ◽  
J Integral ◽  
Test Results ◽  
High Tensile Strength ◽  
Fracture Properties ◽  
Epoxy Asphalt ◽  
Scb Test ◽  
Good Repeatability

The fracture properties of the thermo-setting materials of epoxy asphalt mixture were evaluated based on J-integral concept and ultimate strength and compared to that of HMA with thermo-plastic binder materials. Totally 60 specimens cored from SGC with different notches were tested with SCB test under a temperature of -10°C and 20°C. The experimental results reveals that epoxy asphalt mixture has a super higher resistance of fracture at low temperature than thermo-plastic HMA due to its super high tensile strength and flexibility, and the influences of temperature on the fracture resistance of EAM is not so significant as that of thermo-plastic HMA. Good repeatability of SCB test results indicates the capability of the SCB test to be useful for measuring the fracture toughness of epoxy asphalt mixture.

scholarly journals Evaluation of Fracture Resistance of Asphalt Mixtures Using the Single-Edge Notched Beams

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Biao Ding ◽  
Xiaolong Zou ◽  
Zixin Peng ◽  
Xiang Liu
Keyword(s):  
Fracture Toughness ◽  
Fracture Energy ◽  
Viscoelastic Properties ◽  
Fracture Resistance ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Single Edge ◽  
Fracture Properties ◽  
Different Temperatures ◽  
Peak Value

To determine and compare the fracture properties of different asphalt mixtures, single-edge notched beam (SENB) tests using three types of asphalt mixtures were applied in this study under the conditions of different notched depths and different temperatures. The effects of notched depths and temperatures on the fracture toughness and fracture energy were analyzed. The results indicate that the notch depth has no significant effects on the fracture toughness and the fracture energy, but the gradation has relatively obvious effects on the fracture energy, which the larger contents of course aggregate leads to increase the discreteness of the fracture energy of the specimen. The temperature has significant effects on the ultimate loads, fracture energy, and fracture toughness. The ultimate loads of the SENBs reach the peak value at 0°C, which could be resulted in that viscoelastic properties of asphalt mixture depend with temperatures. The fracture toughness at −20°C of continuously graded asphalt mixtures are higher than those of gap-graded asphalt mixtures. On the contrary, the fracture toughness of gap-graded asphalt mixtures is higher at temperatures from −10°C to 20°C. The fracture energy increases with temperatures, and the fracture energy of SMA-13 is significantly larger than those of AC-13 and AC-16.

Fracture Toughness of Aged Stainless Steel Primary Piping and Reactor Vessel Materials

1987 ◽  
Vol 109 (4) ◽  
pp. 440-448 ◽  
Author(s):  
W. J. Mills
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Ductile Fracture ◽  
Thermal Aging ◽  
Fracture Resistance ◽  
Reactor Vessel ◽  
Initiation Toughness ◽  
Second Phase ◽  
Premature Failure ◽  
Fracture Properties

The ductile fracture toughness behavior of FFTF primary piping and reactor vessel construction materials was characterized using the multiple-specimen JR-curve technique before and after 10,000-hr thermal aging treatments. The test materials included Types 304 and 316 stainless steel (SS) and Types 308 and 16–8–2 SS welds. In the unaged condition, these alloys exhibited very high Jc initiation toughness and tearing modulus values at elevated temperatures (427–538°C). The fracture resistance for the 316 SS piping was found to be dependent on orientation; Jc values for the axial (C–L) direction were 60 to 70 percent lower than those for the circumferential (L–C) orientation. The lower fracture properties in the C–L orientation resulted from premature failure of stringers aligned in the axial direction. Thermal aging at 427° C caused no degradation in fracture resistance, while 482 and 566° C agings resulted in a modest 10 to 20 percent reduction in Jc for both base and weld metals. Residual toughness levels after aging are adequate for precluding any possibility of nonductile fracture. Hence, conventional stress and strain limits, such as those provided by the ASME Code, are sufficient to guard against ductile fracture for SS components that have accumulated 10,000-hr exposures at or below 566° C. Metallographic and fractographic examinations revealed that the degradation in fracture properties was associated with aging-induced second-phase precipitation.

Fracture Behavior of Polypropylene /Elastomer Blends

2008 ◽  
Vol 47-50 ◽  
pp. 278-281 ◽  
Author(s):  
M. Hernández ◽  
M.N. Ichazo ◽  
J. González ◽  
C. Albano ◽  
Orlando Santana
Keyword(s):  
Fracture Toughness ◽  
Plastic Deformation ◽  
Energy Dissipation ◽  
Fracture Resistance ◽  
Fracture Behavior ◽  
Thermoplastic Elastomer ◽  
Test Results ◽  
Essential Work ◽  
Dynamic Vulcanization ◽  
Injection Molded

In this paper, effort has been undertaken to study the fracture behavior of thermoplastic/elastomer (PP/SBS) dynamically vulcanized blends by analyzing the EWF test results. PP/SBS blends were prepared with concentrations of SBS of 15, 30 and 40 wt%. Deeply double edged notched tension (DDENT) specimens were cut from injection molded plaques for fracture testing. It should be noted that the incorporation of SBS to PP seems to enhance fracture toughness, thus the specific essential work (we) increases with elastomer content. The elastomer particles contribute to the energy dissipation at the fracture surface and in the outer plastic zone in which various types of deformation might have been at work. Also, it seems that the fracture toughness value levels-off from 30 wt% rubber on. In addition, the incorporation of SBS triggers a considerable plastic deformation, since the non-essential work ( βwp) increases compared to the value of pure PP. Nonetheless, a decrease in βwp is present with increasing amount of rubber. So the EWF method revealed that the dynamic vulcanization method can impair fracture resistance to PP/SBS blends.

Fracture Mechanisms in NiAlCr Eutectic Composites

1992 ◽  
Vol 273 ◽  
Author(s):  
Keh-Minn Chang
Keyword(s):  
Fracture Toughness ◽  
Fracture Resistance ◽  
Fracture Behavior ◽  
Room Temperature ◽  
Ternary Systems ◽  
Fracture Mechanisms ◽  
Fracture Properties ◽  
Intermetallic Matrix ◽  
Binary Eutectic ◽  
Ternary Eutectics

ABSTRACTSelected eutectic compositions in Ni-Al-Cr ternary systems were processed by directional solidification (DS) with various growth rates. Fracture toughness tests were performed at room temperature and 400 °C; fracture surfaces of broken specimens were examined using SEM to investigate fracture behavior of each alloy. The alignment of eutectic phases was found to play an important role in composite toughening for the intermetallic matrix. Binary eutectic composites consisting of bcc α-Cr and B2 β-NiAl phases with a directional, well-aligned structure showed improved fracture properties over NiAl single crystals. Ternary eutectics, which contain an fcc γ-Ni phase, offered an excellent fracture resistance at room temperature.

scholarly journals Fracture toughness design in horse hoof keratin

1986 ◽  
Vol 125 (1) ◽  
pp. 29-47 ◽  
Author(s):  
J. E. Bertram ◽  
J. M. Gosline
Keyword(s):  
Fracture Toughness ◽  
Fracture Resistance ◽  
Tensile Tests ◽  
Compact Tension ◽  
J Integral ◽  
Morphological Organization ◽  
Strain Behaviour ◽  
Weak Plane ◽  
Equine Hoof ◽  
The Relationship

An engineering fracture mechanics approach was applied to the analysis of the fracture resistance of equine hoof-wall. The relationship between fracture toughness and the morphological organization of the keratin hoof tissue was investigated. Fracture toughness was evaluated using the J-integral analysis method which employs the compact tension test geometry. Tensile tests were also conducted to evaluate the effect of the morphological organization on the stress-strain behaviour. Hoof-wall has greatest fracture resistance for cracks running proximally, parallel to the tubular component of the wall keratin. For fully hydrated material tested in this direction the mean critical J-integral value at failure was 1.19 X 10(4)J m-2. This was nearly three times greater than the value determined for the weakest orientation, in which the crack ran parallel to the material between the tubules. The lower fracture toughness of the intertubular material dominates the fracture behaviour of this tissue. The tubular components of the wall appear to reinforce against fracture along the weak plane and the entire wall organization provides the mechanical capability for limiting and controlling fracture in this tissue.

scholarly journals Experimental Investigation on the Tensile and Fracture Properties of Burst-Prone Coal under Quasistatic Condition

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Shuang Gong ◽  
Zhen Wang ◽  
Lei Zhou ◽  
Wen Wang
Keyword(s):  
Fracture Toughness ◽  
Plane Strain ◽  
Surface Strain ◽  
J Integral ◽  
Plane Strain Fracture Toughness ◽  
Notch Depth ◽  
Coal Specimen ◽  
Fracture Properties ◽  
Strain Fracture ◽  
Dimensionless Stress

To study the tensile and fracture properties of the specimen under the quasistatic loading, the Brazilian disc splitting method and the notched semicircular bend (NSCB) method were used to test the tensile properties of coal specimens, and the fracture properties of NSCB specimens with different notch depths were tested and analyzed. The applicability of plane strain fracture toughness KIC and J-integral fracture toughness in evaluating the fracture properties of coal specimens was discussed. The influence of notch depth on the fracture toughness measurement of the NSCB specimen was studied. Combined with the surface strain monitoring of specimens during loading and the industrial CT scanning image of damaged specimens, the deformation characteristics of coal specimen under loads and the distribution law of crack after failure were analyzed. The results show that the NSCB test is suitable for measuring the tensile strength of a coal specimen; when the dimensionless notch depth is β = 0.28, the dispersion of plane strain fracture toughness KIC of the NSCB specimen is the smallest. Besides, the plane strain fracture toughness of coal is obviously affected by the notch depth and dimensionless stress intensity factor. The J-integral fracture toughness can be used to effectively evaluate the fracture performance of specimens.

Fracture Toughness of Irradiated HT-9 Weld Metal

1985 ◽  
Vol 107 (4) ◽  
pp. 329-333 ◽  
Author(s):  
F. H. Huang ◽  
D. S. Gelles
Keyword(s):  
Fracture Toughness ◽  
Weld Metal ◽  
Fracture Process ◽  
Irradiation Temperature ◽  
Integral Approach ◽  
J Integral ◽  
Test Results ◽  
Weld Material ◽  
Initiation Fracture Toughness ◽  
Scanning Electron

Fracture toughness tests were performed at 93, 205, 316, and 427°C using electropotential techniques on HT-9 weld material irradiated to a fluence of 2.35 × 1022 n/cm2 (E>0.1 MeV) at 390°C. Testing of welds irradiated at 450, 500, and 550°C was performed at 205°C. Test results were analyzed using the J-integral approach. It was found that the initiation fracture toughness of these HT-9 welds increased slightly, while the tearing modulus decreased significantly after irradiation to a fluence of 2.35 × 1022 n/cm2. In addition, results showed that irradiation temperature had little effect on the initiation fracture toughness of HT-9 weld metal. The specimens were examined by scanning electron microscopy after the test in order to understand the fracture process in this weld material.

Micromechanics Measurements Applied to Integrated Circuit Microelectronics

1997 ◽  
Vol 473 ◽  
Author(s):  
David R. Clarke
Keyword(s):  
Integrated Circuits ◽  
Integrated Circuit ◽  
Fracture Resistance ◽  
Interface Fracture ◽  
New Techniques ◽  
Fracture Properties ◽  
Engineered Structures ◽  
Mechanical And Fracture Properties ◽  
Interconnect Lines ◽  
Metallic Interconnect

ABSTRACTAs in other engineered structures, fracture occasionally occurs in integrated microelectronic circuits. Fracture can take a number of forms including voiding of metallic interconnect lines, decohesion of interfaces, and stress-induced microcracking of thin films. The characteristic feature that distinguishes such fracture phenomena from similar behaviors in other engineered structures is the length scales involved, typically micron and sub-micron. This length scale necessitates new techniques for measuring mechanical and fracture properties. In this work, we describe non-contact optical techniques for probing strains and a microscopic “decohesion” test for measuring interface fracture resistance in integrated circuits.

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