摘要 :
In this paper, the spalling of the gear teeth surface was studied. It was concluded that there did not exist any contact fatigue dehiscence in the gear through macroscopic analysis, microstructure analysis and morphology of incisi...
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In this paper, the spalling of the gear teeth surface was studied. It was concluded that there did not exist any contact fatigue dehiscence in the gear through macroscopic analysis, microstructure analysis and morphology of incision analysis. The main reason of the dehiscence spalling in the gear teeth was the presentation of fissuary. The fissuraing expanded and developed under the alternating stress to the gear teeth surface layer spalling. The formation and enlargement of the fissuary had a strong relation with its treatment process.
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摘要 :
In this paper, the spalling of the gear teeth surface was studied. It was concluded that there did not exist any contact fatigue dehiscence in the gear through macroscopic analysis, microstructure analysis and morphology of incisi...
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In this paper, the spalling of the gear teeth surface was studied. It was concluded that there did not exist any contact fatigue dehiscence in the gear through macroscopic analysis, microstructure analysis and morphology of incision analysis. The main reason of the dehiscence spalling in the gear teeth was the presentation of fissuary. The fissuraing expanded and developed under the alternating stress to the gear teeth surface layer spalling. The formation and enlargement of the fissuary had a strong relation with its treatment process.
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摘要 :
Based on synthesizing the robot's chassis mechanism, a transformable chassis is presented to adapt to the conflictive requirements of complex fields. A transformable wheel-legged robot has been designed with the applied chassis. A...
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Based on synthesizing the robot's chassis mechanism, a transformable chassis is presented to adapt to the conflictive requirements of complex fields. A transformable wheel-legged robot has been designed with the applied chassis. As a variable topology mechanism, the robot has many changeable configurations. Finally the structure implementation of the robot was discussed.
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摘要 :
Based on synthesizing the robot's chassis mechanism, a transformable chassis is presented to adapt to the conflictive requirements of complex fields. A transformable wheel-legged robot has been designed with the applied chassis. A...
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Based on synthesizing the robot's chassis mechanism, a transformable chassis is presented to adapt to the conflictive requirements of complex fields. A transformable wheel-legged robot has been designed with the applied chassis. As a variable topology mechanism, the robot has many changeable configurations. Finally the structure implementation of the robot was discussed.
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Carbon nanotubes/zirconia/hydroxyapatite biocomposites was prepared by hot-pressing sintering under Ar atmosphere. The influence of sintering temperature on the mechanical properties and microstructure of carbon nanotube/zirconia/...
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Carbon nanotubes/zirconia/hydroxyapatite biocomposites was prepared by hot-pressing sintering under Ar atmosphere. The influence of sintering temperature on the mechanical properties and microstructure of carbon nanotube/zirconia/hydroxyapatite biocomposites was studied. We tested the bending strength and fracture toughness by universal electronic materials testing machine. The component of the composites was tested by XRD. The fracture surface of the composites was observed by SEM. The results indicate that the bending strength and fracture toughness of the composites is lower when the sintering temperature is lower than 1200℃. The difference of bending strength and fracture toughness at 1200℃ and 1300℃ is little. The number of them has risen markedly than the low temperature which reached to 189.2 MPa and 1.8 MPa·m~(-1/2) respectively. The composition of the composites is mainly of hydroxyapatite, zirconia, carbon nanotubes, and a small amount of calcium phosphate, which indicated that part of the hydroxyapatite has decomposed. SEM photographs show that the fracture surface of the composites sintered at 1200℃ and 1300℃ is ductile fracture status and has bigger density.
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摘要 :
Carbon nanotubes/zirconia/hydroxyapatite biocomposites was prepared by hot-pressing sintering under Ar atmosphere. The influence of sintering temperature on the mechanical properties and microstructure of carbon nanotube/zirconia/...
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Carbon nanotubes/zirconia/hydroxyapatite biocomposites was prepared by hot-pressing sintering under Ar atmosphere. The influence of sintering temperature on the mechanical properties and microstructure of carbon nanotube/zirconia/hydroxyapatite biocomposites was studied. We tested the bending strength and fracture toughness by universal electronic materials testing machine. The component of the composites was tested by XRD. The fracture surface of the composites was observed by SEM. The results indicate that the bending strength and fracture toughness of the composites is lower when the sintering temperature is lower than 1200℃. The difference of bending strength and fracture toughness at 1200℃ and 1300℃ is little. The number of them has risen markedly than the low temperature which reached to 189.2 MPa and 1.8 MPa·m~(-1/2) respectively. The composition of the composites is mainly of hydroxyapatite, zirconia, carbon nanotubes, and a small amount of calcium phosphate, which indicated that part of the hydroxyapatite has decomposed. SEM photographs show that the fracture surface of the composites sintered at 1200℃ and 1300℃ is ductile fracture status and has bigger density.
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摘要 :
In Web report system, there is complex dependence between cells because of calculation formula of each cell. It is important to arrange the formula calculation sequence reasonably for improving the computation efficiency and decre...
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In Web report system, there is complex dependence between cells because of calculation formula of each cell. It is important to arrange the formula calculation sequence reasonably for improving the computation efficiency and decreasing the computational cost. The directed acyclic graph and dividing subgraph are proposed to arrange formula calculation sequence. Then the formal definition of Web report is expounded in detail. After analyzing concrete problem, the Java implementation of algorithm is introduced at last.
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Based on the background of multi-rope friction hoisting transport system and the factual loading of hoisting skip as the object monitored, a practical and economic monitoring system scheme has been put forward, which is not only c...
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Based on the background of multi-rope friction hoisting transport system and the factual loading of hoisting skip as the object monitored, a practical and economic monitoring system scheme has been put forward, which is not only capable of monitoring the factual loading of hoisting skip but also can detect the quantity of unloaded coal left in hoisting skip after the process of unloading expediently, timely predicting overloading phenomenon and powerfully guaranteeing coal mine production safety.
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摘要 :
Based on the background of multi-rope friction hoisting transport system and the factual loading of hoisting skip as the object monitored, a practical and economic monitoring system scheme has been put forward, which is not only c...
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Based on the background of multi-rope friction hoisting transport system and the factual loading of hoisting skip as the object monitored, a practical and economic monitoring system scheme has been put forward, which is not only capable of monitoring the factual loading of hoisting skip but also can detect the quantity of unloaded coal left in hoisting skip after the process of unloading expediently, timely predicting overloading phenomenon and powerfully guaranteeing coal mine production safety.
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