Exploring the recovery of fatigue damage in bituminous mixtures: the role of rest periods

2018 ◽  
Vol 51 (1) ◽  
Author(s):  
Pooyan Ayar ◽  
Fernando Moreno-Navarro ◽  
Miguel Sol-Sánchez ◽  
Mª Carmen Rubio-Gámez
Keyword(s):  
Fatigue Damage ◽  
Bituminous Mixtures ◽  
Rest Periods

Exploring the recovery of fatigue damage in bituminous mixtures: the role of healing

2015 ◽  
Vol 16 (sup1) ◽  
pp. 75-89 ◽  
Author(s):  
Fernando Moreno-Navarro ◽  
Miguel Sol-Sánchez ◽  
M. Carmen Rubio-Gámez
Keyword(s):  
Fatigue Damage ◽  
Bituminous Mixtures

scholarly journals Role of defects in fatigue damage mechanisms of cast polycrystalline superalloy MAR-M 247

2014 ◽  
Vol 12 ◽  
pp. 03005
Author(s):  
Miroslav Šmíd ◽  
Stanislava Fintová ◽  
Ludvík Kunz ◽  
Pavel Hutař
Keyword(s):  
Fatigue Damage ◽  
Damage Mechanisms

Role of Graphene in Reducing Fatigue Damage in Cu/Gr Nanolayered Composite

Nano Letters ◽  
2017 ◽  
Vol 17 (8) ◽  
pp. 4740-4745 ◽  
Author(s):  
Byungil Hwang ◽  
Wonsik Kim ◽  
Jaemin Kim ◽  
Subin Lee ◽  
Seoyoen Lim ◽  
...  
Keyword(s):  
Fatigue Damage

scholarly journals Cortex commands the performance of skilled movement

eLife ◽  
2015 ◽  
Vol 4 ◽  
Author(s):  
Jian-Zhong Guo ◽  
Austin R Graves ◽  
Wendy W Guo ◽  
Jihong Zheng ◽  
Allen Lee ◽  
...  
Keyword(s):  
Cerebral Cortex ◽  
Motor Control ◽  
Food Pellet ◽  
Cortical Activity ◽  
Cortical Inhibition ◽  
Skilled Movement ◽  
Voluntary Motor ◽  
Rest Periods ◽  
Forelimb Movements

Mammalian cerebral cortex is accepted as being critical for voluntary motor control, but what functions depend on cortex is still unclear. Here we used rapid, reversible optogenetic inhibition to test the role of cortex during a head-fixed task in which mice reach, grab, and eat a food pellet. Sudden cortical inhibition blocked initiation or froze execution of this skilled prehension behavior, but left untrained forelimb movements unaffected. Unexpectedly, kinematically normal prehension occurred immediately after cortical inhibition, even during rest periods lacking cue and pellet. This ‘rebound’ prehension was only evoked in trained and food-deprived animals, suggesting that a motivation-gated motor engram sufficient to evoke prehension is activated at inhibition’s end. These results demonstrate the necessity and sufficiency of cortical activity for enacting a learned skill.

scholarly journals New Damage Evolution Law for Steel–Asphalt Concrete Composite Pavement Considering Wheel Load and Temperature Variation

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3723 ◽  
Author(s):  
Xunqian Xu ◽  
Xiao Yang ◽  
Wei Huang ◽  
Hongliang Xiang ◽  
Wei Yang
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Damage Evolution ◽  
Steel Bridge ◽  
Wheel Load ◽  
Evolution Law ◽  
Long Span ◽  
Fatigue Design ◽  
Epoxy Asphalt

Epoxy asphalt (EA) concrete is widely used in constructing long-span steel bridge pavements (SBDPs). This study aims to derive a fatigue damage evolution law, conducting an experimental investigation of SBDP. First, a general theoretical form of the fatigue damage evolution law of materials is established based on the thermal motion of atoms. Then, fatigue experiments demonstrate that this evolution law well represents the known damage–life relationships of SBDP. Taking into account the experimental relationships between damage and fatigue life under symmetrical cyclic loadings with different overload amplitudes and temperature variations, a detailed damage evolution law is deduced. Finally, the role of damage accumulation is discussed on the basis of the proposed damage evolution law for the extreme situation of heavy overload and severe environments. The results show that both heavy loading and falling temperatures increase the fatigue damage of SBDP considerably. EA shows a fatigue life two to three times longer than that of modified matrix asphalt (SMA) or guss asphalt (GA). For the same thickness, EA pavement is demonstrated to be more suitable for an anti-fatigue design of large-span SBDP under high traffic flows and low temperatures.

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