EXPERIMENTAL STUDY ON PROPERTIES OF IMPACT RESISTANCE FOR VIBRATION-ABSORPTION FACILITIES IN PLANTS
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摘要: 乏燃料运输容器的坠落会对乏燃料接收和贮存设施产生较大冲击损伤。为研究不同减振设施的抗冲击性能,利用落锤冲击试验机对10种不同的减振设施进行冲击试验,得到以材料强度、减振层厚度、材料组合类型为变量的减振设施在不同锤头截面面积作用下的锤头冲击深度和冲击力时程曲线。试验结果表明:冲击荷载作用下,随着材料强度、锤头截面面积的增加,冲击反力上升,减振层变形减小,冲击接触时间变短;在减振砌块材料上、下铺设挤塑聚苯乙烯泡沫塑料(XPS)板,可有效消减冲击反力峰值,且XPS板铺设在砌块下方,底部冲击反力峰值更小,减振效果更好;冲击动强度的动力放大系数γ取值在0.83~1.19之间,落锤冲击深度修正系数α取值在0.61~0.98之间。为满足工程设计需要,基于数据分析结果提出了一套减振设施的简化设计算式。Abstract: A fall of transportation containers contained spent nuclear fuel would cause serious impact damage to the spent nuclear fuel receiving and storage facilities. To study the properties of impact resistance for different vibration-absorption facilities, the drop-hammer impact tester was used to perform impact tests on 10 different vibration-absorption facilities, in which time-history curves of impacts and impact depths on vibration-absorption facilities in different impact areas taking material strength, thickness of the vibration-absorption layers, material combination types and cross sections of hammers as variables. The test results showed that under the action of impact loads, the specimens exhibited an increase in impact reaction forces and a decrease in deformation of the vibration-absorption layer and impact contact time with the increase of material strength and cross sections of hammers. Laying XPS boards above and below the vibration damping blocks could effectively reduce the peak value of impact reaction, and the XPS board was laid under the block, the specimens exhibited an decrease in impact reaction force in the bottom and a promotion in vibration reduction effect; the dynamic amplification factor γ of the impact dynamic strength ranged from 0.83 to 1.19, and the depth correction factor α of the hammer head was between 0.61 and 0.98.To meet the needs of engineering design, a set of simplified design formulas for vibration reduction facilities was proposed based on the data analysis.
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