Fatigue is the main failure mode in pavement engineering. Typically, micro-cracks originate at the bottom of asphalt concrete layer due to horizontal tensile strains. Micro-cracks start to propagate towards the upper ...Fatigue is the main failure mode in pavement engineering. Typically, micro-cracks originate at the bottom of asphalt concrete layer due to horizontal tensile strains. Micro-cracks start to propagate towards the upper layers under repeated loading which can lead to pavement failure. Different methods are usually used to describe fatigue behavior in asphalt materials such as： phenomenological approach, fracture mechanics approach and dissipated energy ap- proach. This paper presents a comparison of fatigue resistances calculated for different dissipated energy models using 2-point bending （2PB） at IFSTTAR in Nantes. 2PB tests have been undertaken under different loading and environmental conditions in order to evaluate the properties of the mixtures （stiffness, dissipated energy, fatigue life and healing effect）.展开更多
By using scanning tunneling microscope/microscopy(STM/STS), we reveal the detailed electronic structures around the sharp edges and strained terraces of lateral monolayer-bilayer Pd_(2)Se_(3) heterostructures. We find...By using scanning tunneling microscope/microscopy(STM/STS), we reveal the detailed electronic structures around the sharp edges and strained terraces of lateral monolayer-bilayer Pd_(2)Se_(3) heterostructures. We find that the edges of such heterostructures are well-defined zigzag type. Band bending and alignment are observed across the zigzag edge, forming a monolayer-bilayer heterojunction. In addition, an n-type band bending is induced by strain on a confined bilayer Pd_(2)Se_(3) terrace. These results provide effective toolsets to tune the band structures in Pd_(2)Se_(3)-based heterostructures and devices.展开更多
挠曲电效应广泛应用于柔性传感、医疗复健、振动能量收集等领域,然而尚未有研究探讨挠曲形变量对挠曲电响应性能的影响。基于此,以MoS_(2)/PAN复合挠曲电传感薄膜为例,制备MoS_(2)/PAN弯曲传感器,采用X射线衍射仪和扫描电子显微镜对复...挠曲电效应广泛应用于柔性传感、医疗复健、振动能量收集等领域,然而尚未有研究探讨挠曲形变量对挠曲电响应性能的影响。基于此,以MoS_(2)/PAN复合挠曲电传感薄膜为例,制备MoS_(2)/PAN弯曲传感器,采用X射线衍射仪和扫描电子显微镜对复合挠曲电传感薄膜的晶体结构、微观形貌进行表征。在弯曲角度为0.1°、0.5°、1.5°、4°、7°、15°、30°和45°情况下,通过数字源表收集不同弯曲角度下MoS_(2)/PAN弯曲传感器的挠曲响应电压、电流和响应时间,分析挠曲形变量对挠曲电响应性能的影响规律,基于悬臂梁方法测试计算挠曲电系数。结果表明:MoS_(2)/PAN弯曲传感器挠曲电效应显著,挠曲电系数高达1.95 n C/m,当弯曲角度为7°时,MoS_(2)/PAN弯曲传感器获得最优的挠曲电响应,当弯曲角度小于7°时,挠曲电响应随弯曲角度的增大而增大,但是当弯曲角度大于7°时,挠曲电效应减弱。展开更多
文摘Fatigue is the main failure mode in pavement engineering. Typically, micro-cracks originate at the bottom of asphalt concrete layer due to horizontal tensile strains. Micro-cracks start to propagate towards the upper layers under repeated loading which can lead to pavement failure. Different methods are usually used to describe fatigue behavior in asphalt materials such as： phenomenological approach, fracture mechanics approach and dissipated energy ap- proach. This paper presents a comparison of fatigue resistances calculated for different dissipated energy models using 2-point bending （2PB） at IFSTTAR in Nantes. 2PB tests have been undertaken under different loading and environmental conditions in order to evaluate the properties of the mixtures （stiffness, dissipated energy, fatigue life and healing effect）.
基金Project supported by the National Key Research and Development Project of China(Grant Nos.2016YFA0202300,2018YFA0305800,and 2019YFA0308500)the National Natural Science Foundation of China(Grant Nos.61888102 and 52022105)+1 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(Grant Nos.XDB30000000 and XDB28000000)the University of Chinese Academy of Sciences。
文摘By using scanning tunneling microscope/microscopy(STM/STS), we reveal the detailed electronic structures around the sharp edges and strained terraces of lateral monolayer-bilayer Pd_(2)Se_(3) heterostructures. We find that the edges of such heterostructures are well-defined zigzag type. Band bending and alignment are observed across the zigzag edge, forming a monolayer-bilayer heterojunction. In addition, an n-type band bending is induced by strain on a confined bilayer Pd_(2)Se_(3) terrace. These results provide effective toolsets to tune the band structures in Pd_(2)Se_(3)-based heterostructures and devices.
文摘挠曲电效应广泛应用于柔性传感、医疗复健、振动能量收集等领域,然而尚未有研究探讨挠曲形变量对挠曲电响应性能的影响。基于此,以MoS_(2)/PAN复合挠曲电传感薄膜为例,制备MoS_(2)/PAN弯曲传感器,采用X射线衍射仪和扫描电子显微镜对复合挠曲电传感薄膜的晶体结构、微观形貌进行表征。在弯曲角度为0.1°、0.5°、1.5°、4°、7°、15°、30°和45°情况下,通过数字源表收集不同弯曲角度下MoS_(2)/PAN弯曲传感器的挠曲响应电压、电流和响应时间,分析挠曲形变量对挠曲电响应性能的影响规律,基于悬臂梁方法测试计算挠曲电系数。结果表明:MoS_(2)/PAN弯曲传感器挠曲电效应显著,挠曲电系数高达1.95 n C/m,当弯曲角度为7°时,MoS_(2)/PAN弯曲传感器获得最优的挠曲电响应,当弯曲角度小于7°时,挠曲电响应随弯曲角度的增大而增大,但是当弯曲角度大于7°时,挠曲电效应减弱。
