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铜杆质量对再拉断线的影响 被引量:7
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作者 刘富国 齐增生 冯祥轶 《有色金属加工》 CAS 2010年第4期10-12,7,共4页
讨论了低氧铜杆再拉断线的主要类型,认为铜杆的杂质元素、氧、冶金缺陷和夹杂是影响再拉断线的主要因素,提出电解铜质量控制、铜杆氧含量控制、减少夹杂物和严格控制生产工艺是提高铜杆再拉性能的有效措施。
关键词 光亮圆铜杆 拉断线 杂质元素 气孔 缩孔
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330kV线路耐张(转角)塔高空平衡对拉断线、调线及挂线施工
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作者 赵泽树 《西北电建》 1998年第2期35-36,共2页
关键词 超高压输电线 高空对称平衡锚线 330KV线 耐张(转角)塔 拉断线 线 线 施工
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Direct tension and fracture resistance curves of ultra high performance marine composite materials
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作者 吴香国 韩相默 《Journal of Marine Science and Application》 2008年第3期218-225,共8页
Fracture behavior is one of the most important,yet still little understood properties of ultra-high performance cementitious composites(UHPCC),a new marine structural engineering material. Research on the fracture and... Fracture behavior is one of the most important,yet still little understood properties of ultra-high performance cementitious composites(UHPCC),a new marine structural engineering material. Research on the fracture and direct tension behavior of UHPCC was carried out.The constitution law of UHPCC was divided into three phases:pre-partial debonding,partial debonding,and pullout phases.A direct tension constitution law was constructed based on the proposed fiber reinforcing parameter as a function of fiber volume fraction,fiber diameter and length,and fiber bonding strength.With the definition of linear crack shape,the energy release rate of UHPCC was derived and the R-curve equation was calculated from this.Loading tests of UHPCC using a three-point bending beam with an initial notch were carried out.The predictions from the proposed R-curve were in good agreement with the test results, indicating that the proposed R-curve accurately describes the fracture resistance of UHPCC.Introduction of a fiber reinforcement parameter bridges the fracture property R-curve and micro-composites’ mechanics parameters together.This has laid the foundation for further research into fracture properties based on micro-mechanics.The proposed tension constitution law and R-curve can be references for future UHPCC fracture evaluation. 展开更多
关键词 ultra high performance cementitious composites FRACTURE resistance curve direct tension
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Broken Wires Diagnosis Method Numerical Simulation Based on Smart Cable Structure 被引量:1
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作者 Sheng LI Min ZHOU Yan YANG 《Photonic Sensors》 SCIE EI CAS 2014年第4期366-372,共7页
The smart cable with embedded distributed fiber optical Bragg grating (FBG) sensors was chosen as the object to study a new diagnosis method about broken wires of the bridge cable. The diagnosis strategy based on ca... The smart cable with embedded distributed fiber optical Bragg grating (FBG) sensors was chosen as the object to study a new diagnosis method about broken wires of the bridge cable. The diagnosis strategy based on cable force and stress distribution state of steel wires was put forward. By establishing the bridge-cable and cable-steel wires model, the broken wires sample database was simulated numerically. A method of the characterization cable state pattern which can both represent the degree and location of broken wires inside a cable was put forward. The training and predicting results of the sample database by the back propagation (BP) neural network showed that the proposed broken wires diagnosis method was feasible and expanded the broken wires diagnosis research area by using the smart cable which was used to be only representing cable force. 展开更多
关键词 Fiber optical Bragg grating sensor bridge cable broken wires diagnosis smart cable BP neuralnetwork
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