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the peak height, the time of occurrence of the first peak, and a zero-crossing time, are obtained. The measurement error is within 2%. Key words: thickness of metal; pulsed eddy-current; nondestructive test... square wave as excitation current, and it has more testing parameter than traditional eddy current technology. PEC technology can test thickness and distance of metal simultaneously. So adopting PEC......
J. Cent. South Univ. (2019) 26: 905-915 DOI: https://doi.org/10.1007/s11771-019-4059-x Train driver protection under secondary impact WANG Wen-bin(王文斌), ZHOU He-chao(周和超), ZHAN Jun(詹军) Institute... structural is established based on the finite element method. The secondary impact between train driver and control desk is fully analysed and two measures are proposed to reduce the driver injury severity......
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Simulation of Fiber Pushing-out Test张亚芳Faculty of Civil Engineering,Guangzhou University摘 要:The stress distribution on the failure progress of fiber pushed-out test was studied. A numerical program, developed by meso-damage mechanics, was adopted to simulate the whole failure process of interface debonding and fiber pushing out. From the simulation......
J. Cent. South Univ. (2012) 19: 615-622 DOI: 10.1007/s11771-012-1047-9 Characteristics of ventilation coefficient and its impact on urban air pollution LU Chan(路婵), DENG Qi-hong(邓启红), LIU Wei-wei(刘蔚巍... the whole year. However, such climatic disadvantage may create an uncertain risk on the air quality. Therefore, it is of significant importance to investigate the impact of the meteorological......
J. Cent. South Univ. (2017) 24: 977-987 DOI: 10.1007/s11771-017-3500-2 Porosity of crushed rock layer and its impact on thermal regime of Qinghai-Tibet Railway embankment LIU Ming-hao(刘明浩)1, 2, LI... adverse impacts of wind-blown sand clogging and rock weathering in permafrost areas. However, though the porosity measurement was studied by HE et al [24], the impact of permeability or porosity changes......
J. Cent. South Univ. (2020) 27: 210-220 DOI: https://doi.org/10.1007/s11771-020-4289-y Model test to investigate reasonable reactive artificial boundary in shaking table test with a rigid container... of Springer Nature 2020 Abstract: When conducting dynamic tests of underground structure by a rigid container, reasonable boundary conditions are one of the essential factors related to the accuracy of test......
金示波冲击试验结果 Fig.2 Results of TC4 alloy by instrumented impact test 动态断裂韧性还受到相形貌的影响.研究[8]表明:相界面在断裂过程中能够作为显微孔洞的形核位置.尺寸较小的相能够增加组织中界面的数量,从而增加起裂过程中消耗能量的可能性,但是,长度/宽度较大的相会导致组织的变形协调能力减弱.因此,对于空冷的(α初+β转...一般位于韧窝的边缘. 图3 TC4合金不同冷却制度试样示波冲击断口SEM像 Fig.3 SEM images of TC4 alloys after instrumented impact test under various cooling conditions: (a) 920 ℃, 1 h, FC; (b) 920 ℃, 1......
; 文献标志码:A 文章编号:1672-7207(2019)05-1181-11 Stability analysis and structural parameter optimization of pillar under impact of rockfall Yu Qingjun1, 2, Li... process. Second, the influences of six kinds of parameters of peach pillars on the minimum protective layer thickness under the maximum impact force of the roadway were analyzed based on structural......
不锈钢复合板与16MnR钢冲击拉伸力学特性研究 唐仕英1,文潮1,李迅1,林英睿1,关锦清1,周刚1,刘晓新1 (1.西北核技术研究所,陕西,西安,710024) 摘要:常温下以不锈钢复合板(16MnR钢板与0Cr18Ni9Ti钢板爆轰复合)和16MnR钢为研究对象,利用分离式霍普金森杆技术,在旋转盘冲击拉伸试验机上完成冲击拉伸加载试验.研究应变率在270~1 650 s~(-1)范围内,材料的冲击力学特性.测试结果表明,不锈钢复合板和16MnR钢具有应变率强化效应,通过电镜分析确定过载断裂区为韧窝结构,爆轰复合经热处理后材料的塑性基本无改变,两种材料仍为塑性材料. 关键词:冲击拉伸; 不锈钢复合板; 16MnR钢板; 应变率; impact tensile test; stainless clad steel plate; 16MnR steel; strain rate......
