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.

Fatigue performance evaluation of modified asphalt binder using of dissipated energy approach

2017 ◽  
Vol 136 ◽  
pp. 184-191 ◽  
Author(s):  
Mahmoud Ameri ◽  
Mohammadreza Seif ◽  
Massoumeh Abbasi ◽  
Mohammad Molayem ◽  
Alireza KhavandiKhiavi
Keyword(s):  
Performance Evaluation ◽  
Asphalt Binder ◽  
Energy Approach ◽  
Fatigue Performance ◽  
Dissipated Energy ◽  
Modified Asphalt ◽  
Modified Asphalt Binder

Effect of Mineral Fillers on Fatigue Resistance and Fundamental Material Characteristics: Mechanistic Evaluation

2003 ◽  
Vol 1832 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Yong-Rak Kim ◽  
Dallas N. Little ◽  
Injun Song
Keyword(s):  
Fatigue Resistance ◽  
Damage Mechanics ◽  
Fatigue Behavior ◽  
Continuum Damage Mechanics ◽  
Hydrated Lime ◽  
Mechanical Tests ◽  
Asphalt Binders ◽  
Test Results ◽  
Linear Viscoelastic ◽  
Mineral Fillers

Complex characteristics of fatigue behavior were evaluated on the basis of test results and their mechanical analyses. The dynamic shear rheometer was used to characterize fundamental linear viscoelastic properties of asphalt binders and mastics. Various dynamic mechanical tests using cylindrical sand–asphalt samples mixed with pure binders, mastics, or both were also performed to estimate viscoelastic characteristics and fatigue behavior. To assess the filler effect, two distinctly compositionally different asphalt binders, AAD-1 and AAM-1, and two fillers, limestone and hydrated lime, were selected. Test results were analyzed using viscoelastic theory, a fatigue prediction model based on continuum damage mechanics, and a rheological composite model. The role of fillers in fatigue resistance was quantified, and induced mechanisms due to filler addition were investigated. The effect of hydrated lime, which is highly binder specific, as a filler was further discussed by comparing test results from hydrated lime filler and test results from limestone filler.

Fatigue Behavior of Rubber-Modified Pavements

1998 ◽  
Vol 1639 (1) ◽  
pp. 73-82 ◽  
Author(s):  
Lutfi Raad ◽  
Stephan Saboundjian
Keyword(s):  
Fatigue Life ◽  
Fatigue Resistance ◽  
Fatigue Behavior ◽  
Dissipated Energy ◽  
Concrete Pavements ◽  
Wet Process ◽  
Displacement Mode ◽  
Asphalt Rubber ◽  
Support Conditions ◽  
Repetitions To Failure

Over the last 18 years, a number of rubberized pavement projects have been built in Alaska. Initial laboratory and field investigations sponsored by the Alaska Department of Transportation and Public Facilities (AKDOT&PF) and conducted by Raad et al. indicated improved fatigue performance of the rubberized sections in comparison with conventional asphalt concrete pavements. The results of a follow-up investigation to develop design equations for rubberized pavements in Alaska are presented. Laboratory studies were conducted on field specimens using the flexural fatigue test in the controlled-displacement mode. Specifically, the rubberized mixes included asphalt-rubber concrete with AC-2.5 (wet-process) and PlusRide RUMAC with AC-5. Tests were performed for a range of temperatures varying between 22°C and –29°C. Fatigue relationships were developed in terms of repeated flexure strain, dynamic flexure stiffness of the mix, and repetitions to failure. Relationships for the dynamic flexure stiffness as a function of temperature were also developed. Dissipated energy associated with repeated flexure stress and strain was determined and used to assess the damage behavior of conventional and rubberized mixes. The proposed fatigue equations were used to compare the behavior of the rubberized mixes with conventional AC-5 mixes at 20°C and 0°C. Results of the analysis show that at 20°C, asphalt-rubber and AC-5 mixes exhibit essentially similar fatigue resistance, whereas PlusRide has the least fatigue life. However, at 0°C, the fatigue resistance of PlusRide and asphalt-rubber exceeds that of the conventional AC-5 mix. The fatigue equations were also used to compare the fatigue life of conventional and rubberized pavements for different surface layer temperatures and foundation support conditions.

Fatigue performance evaluation of plate and shell heat exchangers

2020 ◽  
Vol 188 ◽  
pp. 104237
Author(s):  
G.S.M. Martins ◽  
R.P.P.D. da Silva ◽  
L. Beckedorff ◽  
A.S. Monteiro ◽  
K.V. de Paiva ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Heat Exchangers ◽  
Fatigue Performance ◽  
Plate And Shell

scholarly journals Tension-Tension Fatigue Behavior of High-Toughness Zr61Ti2Cu25Al12 Bulk Metallic Glass

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2815
Author(s):  
Yu Hang Yang ◽  
Jun Yi ◽  
Na Yang ◽  
Wen Liang ◽  
Hao Ran Huang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Shear Band ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Fatigue Resistance ◽  
Metallic Glasses ◽  
Stress Amplitude ◽  
Fatigue Behavior ◽  
Bulk Metallic Glasses ◽  
High Toughness

Bulk metallic glasses have application potential in engineering structures due to their exceptional strength and fracture toughness. Their fatigue resistance is very important for the application as well. We report the tension-tension fatigue damage behavior of a Zr61Ti2Cu25Al12 bulk metallic glass, which has the highest fracture toughness among BMGs. The Zr61Ti2Cu25Al12 glass exhibits a tension-tension fatigue endurance limit of 195 MPa, which is higher than that of high-toughness steels. The fracture morphology of the specimens depends on the applied stress amplitude. We found flocks of shear bands, which were perpendicular to the loading direction, on the surface of the fatigue test specimens with stress amplitude higher than the fatigue limit of the glass. The fatigue cracking of the glass initiated from a shear band in a shear band flock. Our work demonstrated that the Zr61Ti2Cu25Al12 glass is a competitive structural material and shed light on improving the fatigue resistance of bulk metallic glasses.

scholarly journals Fatigue Resistance Characterization of Warm Asphalt Rubber by Multiple Approaches

2018 ◽  
Vol 8 (9) ◽  
pp. 1495 ◽  
Author(s):  
Jiangmiao Yu ◽  
Xianshu Yu ◽  
Zheming Gao ◽  
Feng Guo ◽  
Duanyi Wang ◽  
...  
Keyword(s):  
Fatigue Test ◽  
Fatigue Resistance ◽  
Crumb Rubber ◽  
Waste Recycling ◽  
Fatigue Performance ◽  
Four Point Bending ◽  
Asphalt Rubber ◽  
Shear Fatigue ◽  
Tensile Fatigue ◽  
Indirect Tensile

Warm asphalt rubber (WAR) mixture is a sustainable paving material with advantages including waste recycling and noise reducing. A comprehensive understanding of the fatigue performance of WAR specimens is helpful to its wide application. However, research on evaluating the fatigue performance of WAR binder and mixtures is very limited. This paper applies five fatigue analysis approaches to evaluate the fatigue life of WAR samples with three different warm mix asphalt (WMA) additives. The conventional G*sinδ, linear amplitude sweep (LAS), indirect tensile fatigue test (ITFT), and four-point bending beam (4PB) test were conducted based on available standards. In addition, a novel shear fatigue test was performed on WAR mortars. Test results indicated that the incorporation of crumb rubber has a significantly positive effect on fatigue resistance. WAR with chemical and foaming additives exhibited a poorer performance than asphalt rubber (AR), but their fatigue performance was still greatly superior to the non-rubberized samples. Finally, LAS as well as mortar shear fatigue and 4PB tests provided the same prediction of fatigue resistance, while the results of G*sinδ and the ITFT were inconsistent. It is recommended to use LAS, the mortar shear fatigue test, and the 4PB test for the fatigue resistance evaluation of rubberized specimens. The validation of the findings with more materials and field performances is recommended.

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

Surface Engineering of Polycrystalline Silicon Microelectromechanical Systems for Fatigue Resistance

2002 ◽  
Vol 729 ◽  
Author(s):  
C.L. Muhlstein ◽  
W.R. Ashurst ◽  
E.A. Stach ◽  
R. aboudian ◽  
R.O. Ritchie
Keyword(s):  
Stress Corrosion ◽  
Fatigue Resistance ◽  
Reaction Layer ◽  
Polycrystalline Silicon ◽  
Microelectromechanical Systems ◽  
Fatigue Behavior ◽  
Ambient Air ◽  
Degradation Process ◽  
Native Oxide ◽  
Premature Failure

AbstractRecent research has established that for silicon structural films used in microelectromechanical systems (MEMS), the susceptibility to premature failure under cyclic fatigue loading originates from a degradation process that is confined to the surface oxide. In ambient air environments, a sequential, stress-assisted oxidation and stress-corrosion cracking process can occur within the native oxide on polycrystalline silicon (referred to as reaction-layer fatigue); for the structural films of micron-scale dimensions, such incipient cracking in the oxide can lead to catastrophic failure of the entire silicon component. Since the degradation process is intimately linked to the thin reaction layer on the silicon, modification of this surface and the access of the environment to it can dramatically alter the fatigue resistance of the material. The purpose of this paper is to evaluate the efficacy of modifying the fatigue behavior of polycrystalline silicon with alkene-based monolayers. Specifically, 2-μm thick polysilicon fatigue structures were coated with a monolayer film based on 1-octadecene and cyclically tested to failure in laboratory air. By applying the coating, the formation of the native oxide was prevented. Compared to the fatigue behavior of untreated polysilicon, the lives of the coated samples ranged from 105 to >1010 cycles at stress amplitudes greater than ∼90% of the ultimate strength of the film. The dramatic improvement in fatigue resistance was attributed to the monolayer inhibiting the formation of the native oxide and stress corrosion of the surface. It is concluded that the surprising susceptibility of thin structural silicon films to premature fatigue failure can be inhibited by such monolayer coatings.

MULTIAXIAL FATIGUE CRITERIA APPLIED TO A POLYCHLOROPRENE RUBBER

2012 ◽  
Vol 85 (1) ◽  
pp. 80-91 ◽  
Author(s):  
J. L. Poisson ◽  
S. Méo ◽  
F. Lacroix ◽  
G. Berton ◽  
N. Ranganathan
Keyword(s):  
Large Strain ◽  
Fatigue Behavior ◽  
Viscoelastic Model ◽  
Type Specimen ◽  
Multiaxial Fatigue ◽  
Dissipated Energy ◽  
Rubber Part ◽  
Phase Angles ◽  
Fatigue Criterion ◽  
Important Objective

Abstract Due to their interesting mechanical behavior and their diversity, rubber materials are more and more used in industry. Indeed, formulating a multiaxial fatigue criterion to predict fatigue lives of rubber components constitutes an important objective to conceive rubber products. An experimental campaign is developed here to study the multiaxial fatigue behavior of polychloroprene rubber. To reproduce multiaxial solicitations, combined tension–torsion tests were carried out on a dumbbell-type specimen (an axisymmetric rubber part bonded to metal parts with a reduced section at mid-height), with several values of phase angles between tension and torsion. A constitutive model is needed to calculate multiaxial fatigue criteria, and then analyze fatigue results. A large strain viscoelastic model, based on the tension–torsion kinematics, is then used to determine the material's stress–strain law. Dissipated energy density is introduced as a multiaxial fatigue criterion, and compared with those usually used in the literature. A multiaxial Haigh diagram is then built to observe the influence of Rd-ratio (ratio of the axial displacement's minimum to the axial displacement's maximum) on the multiaxial fatigue lives of polychloroprene rubber.

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