本文選題：雷電流　切入點(diǎn)：不同分量　出處：《高電壓技術(shù)》2017年05期 　論文類型：期刊論文

【摘要】：雷擊鋁合金的損傷特性和損傷機(jī)理是油罐等防雷保護(hù)研究的基礎(chǔ)之一。為此,基于模擬雷電流試驗(yàn)方法研究了不同雷電流分量作用下儲(chǔ)油常用鋁合金材料鋁3003的損傷特性和損傷機(jī)理,通過(guò)采用高分辨掃描電子顯微鏡(SEM)和X射線能量色散分析(EDS)對(duì)雷擊3003鋁合金的損傷形貌、組織形貌、損傷前后元素原子質(zhì)量分?jǐn)?shù)變化進(jìn)行了觀察和分析,結(jié)合不同雷電流分量的特性討論了不同雷電流分量下合金的損傷特性和損傷機(jī)理。研究結(jié)果表明:首次短時(shí)間回?fù)綦娏鞣至孔饔孟?合金表面形成一層較薄氧化膜,膜層破碎萌生裂紋;回?fù)糸g長(zhǎng)持續(xù)時(shí)間雷電流分量作用下,合金損傷區(qū)第2相粒子密度增大且尺寸減小,過(guò)渡區(qū)第2相粒子密度明顯減少,損傷區(qū)和過(guò)渡區(qū)界面出現(xiàn)樹(shù)枝晶和帶狀晶界,合金受熱熔化后在電應(yīng)力作用下凝固不均勻產(chǎn)生裂紋;末次回?fù)艉箝L(zhǎng)持續(xù)時(shí)間雷電流分量作用下,合金出現(xiàn)"過(guò)燒"現(xiàn)象,復(fù)熔程度加深,出現(xiàn)熔坑,合金損傷區(qū)形成了較多的析氫氣孔,造成應(yīng)力集中萌生裂紋。該研究結(jié)果可以為合金材料防雷性能的改進(jìn)提供參考。
[Abstract]:The damage characteristics and mechanism of lightning strike aluminum alloy is one of the foundation of lightning protection research for oil tank. Based on the simulated lightning current test method, the damage characteristics and damage mechanism of aluminum alloy 3003, a common aluminum alloy material for oil storage under different lightning current components, are studied. High resolution scanning electron microscopy (SEM) and X-ray energy dispersive analysis (EDS) were used to observe and analyze the damage morphology, microstructure and atomic mass fraction of element in 3003 aluminum alloy after lightning strike. Combined with the characteristics of different lightning current components, the damage characteristics and damage mechanism of the alloy under different lightning current components are discussed. The results show that a thin oxide film is formed on the surface of the alloy under the action of the first short-time backstroke current component. The second phase particle density in the damage zone increases and the size decreases, while the second phase particle density decreases obviously in the transition zone. Dendrite and band-shaped grain boundary appear at the interface of the damage zone and transition zone, the alloy solidifies inhomogeneously under the action of electric stress after heating and melting, and under the action of lightning current component for a long time after the last backstroke, the alloy appears the phenomenon of "overburning". The remelting degree is deepened, the melting pit appears, and more hydrogen evolution pores are formed in the damage zone of the alloy, which results in the stress concentration initiation crack. The results can provide a reference for the improvement of the lightning protection performance of the alloy material.
【作者單位】： 安徽省防雷中心;上海交通大學(xué)電氣工程系電力傳輸與功率變換控制教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(51577117)~~
【分類號(hào)】：TG146.21

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1 茍琪;振動(dòng)鉆孔刀具的損傷特性[J];航空工藝技術(shù);1990年02期

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本文編號(hào)：1605047