Micromorphological Characteristics and Origin Analysis of Contact Metamorphic Coal [PDF]
, 2023 BACKGROUNDDuring tectonic movements and geological activities, coal seams are destroyed and engulfed by magma, which not only accelerates the slow carbon cycling process in geological history, but also changes and disrupts the carbon cycling balance of ...
Bingxiang LIU +5 more
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Root Tensile Characteristics of Herbaceous Plants from Source Areas of Lanniqing Landslide in Zhaotong City, Yunnan Province [PDF]
, 2023 [Objective] The tensile strength characteristics of plant roots were studied to understand the performance of roots in complexes, in order to provide a basis for the selection of plants to be used in ecological slope protection.
Chen Yunying +4 more
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Hot ductility and fracture mechanism of a Ti-bearing microalloyed steel [PDF]
, 2016 The hot ductility of a Ti-bearing microalloyed steel was studied at temperatures of 600 to 1350 ℃ by a thermal simulator Gleeble 1500.The fracture morphology and microstructure were observed by scanning electron microscopy and optical microscopy.The ...
LI Ming +4 more
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Hot ductility and fracture mechanism of Fe-22Mn-0.7C TWIP steel [PDF]
, 2016 The static tensile behaviors of Fe-22Mn-0.7C TWIP steel and Q235 steel between 700 ℃ and 1300 ℃ were investigated by Gleeble-1500 thermo-mechanical simulator.The microstructure characteristic and fracture morphology were observed by optical microscopy ...
DU Chen-wei +4 more
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Mechanism of Surface Formation for Two-dimensional Ultrasonic Vibration Assisted Grinding of Monocrystal Silicon with Vertical Workpiece Vibration [PDF]
, 2010 通过单晶硅磨削试验以及单颗金刚石磨粒划擦试验,分析垂直于工件平面的二维椭圆超声振动磨削单晶硅的表面形成机制。椭圆超声振子由压电陶瓷晶体与金属弹性体粘接制成,其伸缩模态和弯曲模态频率相同,当输入具有一定相位差的两个交流电压信号时产生二维椭圆振动。试验结果表明,由于二维椭圆振动的施加改变了单晶硅的材料去除机制,加工表面质量明显提高,表面粗糙度显著降低,磨削沟槽变浅而宽,切屑变厚而短,单晶硅材料延性域去除比例增加;通过改变超声振动振幅与磨削深度之间大小关系 ...
吴勇波 +4 more
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Development of a Two-dimensional Ultrasonic Vibration Assisted Grinding Technique of Monocrystal Silicon [PDF]
, 2010 基于超声振动磨削能有效提高加工效率及加工表面质量的特性,通过设计具有伸缩和弯曲两种模态的压电陶瓷椭圆振子,实现了单晶硅二维椭圆振动磨削技术。对超声振子的振动特性进行检测,证实改变压电陶瓷两电极之间的交流信号相位差和电压幅值,可得到不同形状和振幅的椭圆振动。对单晶硅进行超声磨削与普通磨削的对比试验,结果表明二维振动磨削的磨削力大幅降低,表面粗糙度显著减小,表面质量明显提高,加工表面延性域去除比例增加。从而证实二维超声振动磨削方法能够实现高效率高质量单晶硅加工。Based on the ...
吴勇波 +5 more
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Experimental investigation on fracture behavior of lignite and its fracturing significance:taking Shengli Coalfield as an example [PDF]
, 2023 The anisotropy of fracture properties at different bedding orientations of lignite plays an important role in controlling the formation of fracture network of reservoir racturing.
Diankun ZHANG +2 more
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Z-direction Enhancing Manufacturing Strategy for 3D Printing Prosthetic Socket of Continuous Fiber Composite [PDF]
, 2022 The prosthetic socket is a necessary rehabilitation-aid equipment for lower limb amputees. As an important kind of human-machine interface between the residual limb and the prosthesis, the prosthetic socket plays an important role in containing the ...
Li, D +7 more
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Analysis on the fracture failure in crack interaction of mortar using the phase-field method [PDF]
, 2016 This article introduces a new mortar fracture analysis method based on the phase-field method,which is used to analyze the fracture failure in crack interaction of mortar.The non-conserved Allen-Cahn equation was adopted as the system governing equation ...
GE Zhi +4 more
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Gaoya dianqi, 2022 为了深入地研究复合绝缘子的酥朽断裂，获得其与脆断的异同，文中对现场酥断故障复合绝缘子进行了外观形貌检查、扫描电镜分析、傅里叶光谱分析以及X射线扫描分析，并且将结果与脆断绝缘子进行了相应地对比分析。分析表明：酥朽绝缘子断口颜色不再正常，芯棒变软劣化，脆断端口颜色正常；与脆断相比，酥朽样品的电镜结果出现了树脂的气泡现象，纤维丝裸露更严重；元素分析表明，两者都受到了硝酸入侵，都出现了芯棒的水解，但酥朽时更严重。基于实验结果，对两者的断裂机理进行了总结分析，得出放电与酸是造成这类故障的共同因素。
卢明 +5 more
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