Temperature Wave Fatigue Damage and Dissipated Energy Approach to Flow Number Estimation of Asphalt Concrete

2018 ◽  
Vol 48 (5) ◽  
pp. 20170752 ◽  
Author(s):  
M. A. Dalhat ◽  
H. I. Al-Abdul Wahhab
Keyword(s):  
Fatigue Damage ◽  
Asphalt Concrete ◽  
Temperature Wave ◽  
Energy Approach ◽  
Dissipated Energy ◽  
Flow Number

A dissipated energy approach for flow number determination

2020 ◽  
pp. 347-350
Author(s):  
Hamzeh Saqer ◽  
Munir D. Nazzal ◽  
Mohammad Al-Khasawneh ◽  
Ala Abbas ◽  
Sang Soo Kim
Keyword(s):  
Energy Approach ◽  
Dissipated Energy ◽  
Flow Number

Experimental characterisation of fatigue damage in foamed bitumen stabilised materials using dissipated energy approach

2019 ◽  
Vol 216 ◽  
pp. 1-10 ◽  
Author(s):  
Sameera Pitawala ◽  
Arooran Sounthararajah ◽  
James Grenfell ◽  
Didier Bodin ◽  
Jayantha Kodikara
Keyword(s):  
Fatigue Damage ◽  
Energy Approach ◽  
Dissipated Energy ◽  
Foamed Bitumen ◽  
Experimental Characterisation

Fatigue damage analysis in asphalt concrete mixtures using the dissipated energy approach

2006 ◽  
Vol 33 (7) ◽  
pp. 890-901 ◽  
Author(s):  
Khalid A Ghuzlan ◽  
Samuel H Carpenter
Keyword(s):  
Asphalt Concrete ◽  
Fatigue Testing ◽  
Fatigue Curve ◽  
Theoretical Background ◽  
Energy Approach ◽  
Dissipated Energy ◽  
Initial Stiffness ◽  
Fatigue Damage Analysis ◽  
Concrete Damage ◽  
Highly Correlated

An asphalt concrete damage–energy fatigue approach based on the concept of change in dissipated energy is presented in this paper. The damage–energy based fatigue approach is simple and based on a sound theoretical background. The central concept of the energy approach is the energy fatigue curve, which is based on two key elements, namely the plateau value (PV) and the number of load cycles to true failure (Ntf). The plateau value represents the constant value of the percentage of dissipated energy that produces damage to the material under cyclic loading. Failure is defined as the number of load cycles at which this percentage of dissipated energy begins to increase rapidly, indicating instability. Flexural fatigue testing was used to test hundreds of asphalt concrete beams, mainly under controlled-strain testing conditions. It was found that PV is highly dependent on the initial loading conditions, stress, strain, and dissipated energy. As a result, it can be used conveniently in pavement design. The number of load cycles to 50% reduction in initial stiffness was found to be highly correlated with the new failure point (Ntf). Using the dissipated energy concepts in fatigue analysis makes it possible to account for damage accumulation in a straightforward manner.Key words: fatigue of asphalt concrete, dissipated energy, damage, energy ratio.

Testing Study on Fatigue Damage of Asphalt Mixture with Considering the Restoration Time

2014 ◽  
Vol 505-506 ◽  
pp. 204-209
Author(s):  
Biao Ding ◽  
Chuan Chao Zheng ◽  
Hua Nan Wang
Keyword(s):  
Fatigue Damage ◽  
Cyclic Load ◽  
Asphalt Mixture ◽  
Sharp Decrease ◽  
Dissipated Energy ◽  
Time Interval ◽  
The Road ◽  
Restoration Time ◽  
Cumulative Dissipated Energy ◽  
On The Road

Conventional fatigue damage test of asphalt mixture is usually under the condition of constant stress-mode or strain-mode, the specimen is broken when the cyclic load reaches certain number of times. In fact, vehicles on the road are not continuous, traffic volume is different in different time, there is a time interval between neighbouring vehicles. In this paper, time interval was set between two neighbouring cycles, the effect of recovery way, strain size and temperature on cumulative dissipated energy were analyzed. The results show that: in the early stages, recovery methods have little impact on the cumulative dissipated energy, with the increase of cyclic number, the value of trabecular under unconstrained condition will be greater than that of trabecular under constrained one. The bigger the strain size, the greater the value of cumulative dissipated energy; The lower the temperature, the greater the value of cumulative dissipated energy. Under the conditon of low strain size or high temperature , the value of cumulative dissipated energy decreases linearly. For the high strain or low temperature, there is a sharp decrease between the first cycle and second cycle, and then decreases linely in the later cylcles.

An Energy Approach for Helping the Selection of Solid Lubrication Coatings Under Fretting Conditions

2009 ◽  
Author(s):  
D. B. Luo ◽  
V. Fridrici ◽  
Ph. Kapsa ◽  
M. Taillandier ◽  
C. Prud’homme
Keyword(s):  
Master Curve ◽  
Initial Energy ◽  
Energy Approach ◽  
Friction Reduction ◽  
Solid Lubrication ◽  
Dissipated Energy ◽  
Test Parameters ◽  
Definition Of ◽  
Energy Dissipated ◽  
Fretting Damage

Employing friction reduction coatings is one of the most effective methods to palliate the fretting damage. However, facing numerous available coatings, how to compare them and select the optimum one for a specific application is still a challenging task. In this paper, based on the investigation of the fretting behaviors of several bonded solid lubricant coatings, an energy approach in terms of “initial maximal dissipated energy density” was suggested to compare the tribological response of coatings. According to test results, the lifetime of each coating under different test parameters can be fitted by one master curve. The definition of this master curve for a given coating may be used for the prediction of the coating lifetime only by knowing the initial energy dissipated in the contact. The comparison of different master curves for different coatings can be employed to help the coating selection.

Analysis on Coupling Damage of Liquid Rubber Based Concrete under Fatigue and Impact Loading

2010 ◽  
Vol 452-453 ◽  
pp. 481-484
Author(s):  
Yi Ping Liu ◽  
Ting Hui He ◽  
Li Qun Tang ◽  
Xiao Qing Huang
Keyword(s):  
Compressive Stress ◽  
Fatigue Damage ◽  
Impact Loading ◽  
Elastic Moduli ◽  
Dissipated Energy ◽  
Impact Tests ◽  
Liquid Rubber ◽  
Before And After ◽  
Loading Tests ◽  
Definition Of

In this paper coupling damage behaviors of Liquid Rubber Based Concrete (LRBC) are studied experimentally. Compressive fatigue and impact alternant loading tests were carried out on cylindrical LRBC specimens. The elastic moduli were recorded before and after fatigue and impact tests. The quasi-static compressive stress-strain curves after fatigue and impact tests were obtained. According to the definition of dissipated energy, the cumulating of dissipated energy was used to define damage. The analysis on impact and fatigue damages during the loading processes show that fatigue and impact loading lead to the formation and development of inner damage. During the alternant loading process, impact and fatigue damages are coupled mutually, with the former affects the evolution of fatigue damage evidently.

scholarly journals Fatigue performance evaluation of bitumen mastics reinforced with polyolefins through a dissipated energy approach

2020 ◽  
Vol 70 (338) ◽  
pp. 217
Author(s):  
C. Roman ◽  
M. A. Delgado ◽  
M. García-Morales
Keyword(s):  
Performance Evaluation ◽  
Fatigue Resistance ◽  
Fatigue Behavior ◽  
Energy Approach ◽  
Fatigue Performance ◽  
Dissipated Energy ◽  
Morphological Evidence ◽  
Polymer Distribution ◽  
Linear Viscoelastic ◽  
Dynamic Time

Polymers are known to improve the fatigue resistance of sphalt mastics. However, undesirable results can be obtained if the polymer is not successfully integrated into the bitumen binder. The goal of this work is to evaluate the effect of the addition of three selected polyolefins on their mastic’s fatigue performance. Low and high density polyethylenes (LDPE and HDPE) and polypropylene (PP) were chosen and used at the concentration of 4 wt.%. A dissipated energy approach was used in order to analyze the fatigue resistance, at 25 ºC, of the three composites studied. Dynamic time sweeps at and above the linear viscoelastic threshold were carried out. Based on that, the results demonstrated a better improvement when the LDPE was considered. For that binder, fluorescence optical microscopy observations at 25 ºC provided morphological evidence of a more homogeneous bitumen-polymer distribution which could be behind the improved fatigue behavior.

Laboratory investigation of fatigue parameters characteristics of aging asphalt mixtures: A dissipated energy approach

2020 ◽  
Vol 230 ◽  
pp. 116972 ◽  
Author(s):  
Songtao Lv ◽  
Xinghai Peng ◽  
Chaochao Liu ◽  
Dongdong Ge ◽  
Minmin Tang ◽  
...  
Keyword(s):  
Laboratory Investigation ◽  
Asphalt Mixtures ◽  
Energy Approach ◽  
Dissipated Energy
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