建筑电气
建築電氣
건축전기
BUILDING ELECTRICITY
2015年
4期
45-50
,共6页
模拟雷击试验%圆钢%拉力试验%金相分析%雷击损伤%冲击电流试验%力学性能%雷电电弧效应
模擬雷擊試驗%圓鋼%拉力試驗%金相分析%雷擊損傷%遲擊電流試驗%力學性能%雷電電弧效應
모의뢰격시험%원강%랍력시험%금상분석%뢰격손상%충격전류시험%역학성능%뇌전전호효응
Simulation lightning stroke test%round steel%tension test%metallographic analysis%lightning damage%impulse current test%mechanical property%lightning arc effect
雷电直接击中金属材料时，常造成金属材料表面严重烧蚀，其力学性能是否受到影响，内部结构是否发生变化值得研究。利用冲击电流发生器对圆钢试样进行模拟雷击试验，随后对试样进行拉力试验及金相分析。试验发现，与短时间雷击相比，长时间雷击才是导致金属材料力学性能下降的主要原因，长时间雷击后试样的抗拉强度降低了10%左右，其内部结构出现气孔、裂纹等明显的雷击特征。雷击电弧放电的高温效应造成金属材料结构损伤，影响建筑物结构安全，雷击造成的金属损伤特征可作为雷电灾害鉴定的判据之一。
雷電直接擊中金屬材料時，常造成金屬材料錶麵嚴重燒蝕，其力學性能是否受到影響，內部結構是否髮生變化值得研究。利用遲擊電流髮生器對圓鋼試樣進行模擬雷擊試驗，隨後對試樣進行拉力試驗及金相分析。試驗髮現，與短時間雷擊相比，長時間雷擊纔是導緻金屬材料力學性能下降的主要原因，長時間雷擊後試樣的抗拉彊度降低瞭10%左右，其內部結構齣現氣孔、裂紋等明顯的雷擊特徵。雷擊電弧放電的高溫效應造成金屬材料結構損傷，影響建築物結構安全，雷擊造成的金屬損傷特徵可作為雷電災害鑒定的判據之一。
뇌전직접격중금속재료시，상조성금속재료표면엄중소식，기역학성능시부수도영향，내부결구시부발생변화치득연구。이용충격전류발생기대원강시양진행모의뢰격시험，수후대시양진행랍력시험급금상분석。시험발현，여단시간뢰격상비，장시간뢰격재시도치금속재료역학성능하강적주요원인，장시간뢰격후시양적항랍강도강저료10%좌우，기내부결구출현기공、렬문등명현적뢰격특정。뢰격전호방전적고온효응조성금속재료결구손상，영향건축물결구안전，뢰격조성적금속손상특정가작위뇌전재해감정적판거지일。
The surface of metallic material is often suffered from serious ablation under direct lightning stroke. Study on the change of mechanical property and internal structure of metallic material is worth to be carried out. Simulative lightning stroke test on round steel sample is carried out through impulse current generator and tension test and metallographic analysis are carried out on the sample afterwards. It is found that, in comparison with short time lightning stroke, long time lightning stroke is main cause for mechanical property decrease. After long time lightning stroke, the tensile strength of the sample decreased by around 10%, and obvious lightning stroke features like pores and cracks are found at the internal structure. The high temperature effect of arc discharge by lightning stroke damages the structure of metallic material and influences the structure safety of buildings. The metallic damage features caused by lightning stroke can be taken as one of the identification criteria for lightning hazard.
