介绍了金属带材弹塑性变形弯曲基本理论和概念,建立了过拉伸因子OS(Overstrech fac-tor)与塑区比P(rate of plastification)之间的对应关系,指出金属带材在反复弯曲过程中,变形程度最大处OS取值为7比较合理,此时金属带材变形塑区比为85...介绍了金属带材弹塑性变形弯曲基本理论和概念,建立了过拉伸因子OS(Overstrech fac-tor)与塑区比P(rate of plastification)之间的对应关系,指出金属带材在反复弯曲过程中,变形程度最大处OS取值为7比较合理,此时金属带材变形塑区比为85%。对强化金属材料强化系数对矫直机辊缝设定的影响进行了模拟计算和分析,结果表明:要想达到相同的塑区比,强化系数越大,所需的压下量就越大;但当强化系数小于0.01时,与理想金属材料相比,增大的压下量微乎其微,可按理想金属材料近似处理,根据某精整分厂现有产品大纲,带钢的强化系数一般不超过0.01,因此在辊缝预设定模型中,为了简化计算,均按理想金属材料处理,对带钢矫直效果无明显影响。展开更多
Based on the second law of thermodynamics,a method of energy consumption evaluation of electrohydrodynamics(EHD) enhancement of heat transfer was presented, the profit factor of available energy was newly defined.The ...Based on the second law of thermodynamics,a method of energy consumption evaluation of electrohydrodynamics(EHD) enhancement of heat transfer was presented, the profit factor of available energy was newly defined.The experimental data were analyzed. The results showed that the profit factor of available energy increased with increasing heat flux under the same voltage given in experiments, while decreased with increasing voltage under the same heat flux given in experiments.It was found for the first time that the application of EHD enhancement of heat transfer was not economical when the voltage was higher than a critical value at a low heat flux. This method provided a theoretical basis for the economy of EHD heat transfer enhancement.展开更多
文摘介绍了金属带材弹塑性变形弯曲基本理论和概念,建立了过拉伸因子OS(Overstrech fac-tor)与塑区比P(rate of plastification)之间的对应关系,指出金属带材在反复弯曲过程中,变形程度最大处OS取值为7比较合理,此时金属带材变形塑区比为85%。对强化金属材料强化系数对矫直机辊缝设定的影响进行了模拟计算和分析,结果表明:要想达到相同的塑区比,强化系数越大,所需的压下量就越大;但当强化系数小于0.01时,与理想金属材料相比,增大的压下量微乎其微,可按理想金属材料近似处理,根据某精整分厂现有产品大纲,带钢的强化系数一般不超过0.01,因此在辊缝预设定模型中,为了简化计算,均按理想金属材料处理,对带钢矫直效果无明显影响。
文摘Based on the second law of thermodynamics,a method of energy consumption evaluation of electrohydrodynamics(EHD) enhancement of heat transfer was presented, the profit factor of available energy was newly defined.The experimental data were analyzed. The results showed that the profit factor of available energy increased with increasing heat flux under the same voltage given in experiments, while decreased with increasing voltage under the same heat flux given in experiments.It was found for the first time that the application of EHD enhancement of heat transfer was not economical when the voltage was higher than a critical value at a low heat flux. This method provided a theoretical basis for the economy of EHD heat transfer enhancement.
