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7039鋁合金靶板侵徹過程中的組織特征及數(shù)值模擬
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更新時間：2015-11-27
采用光學(xué)顯微鏡(OM)分析***斜侵徹7039鋁合金后彈坑周圍的組織特征，并對侵徹過程進行數(shù)值模擬。
7039鋁合金靶板侵徹過程中的組織特征及數(shù)值模擬Microstructure character and numerical modeling of?7039 aluminum alloy target during impact penetration
采用光學(xué)顯微鏡(OM)分析***斜侵徹7039鋁合金后彈坑周圍的組織特征，并對侵徹過程進行數(shù)值模擬。結(jié)果表明：***侵徹7039鋁合金靶材后，彈坑周圍的顯微組織呈現(xiàn)有規(guī)律的特征；當(dāng)絕熱軟化作用較弱時，彈坑周圍出現(xiàn)絕熱剪切帶和裂紋；且隨著熱軟化的加強，絕熱剪切帶聚合成較寬的層疊剪切變形帶，緊鄰的晶粒嚴重變形產(chǎn)生扭曲帶，侵徹末期組織中形成大量的變形顯微帶。采用Largrange描述的Johnson-Cook本構(gòu)模型能夠有效地模擬***斜沖擊侵徹7039鋁合金靶材的過程。
7039 aluminum alloy target was obliquely penetrated. The microstructure character around the crater was investigated by optical microscopy (OM). A numerical modeling during the impact penetration was established. The results show that, with the bullet penetrating into the 7039 aluminum alloy, the microstructure character around the crater is regular. When the adiabatic softening is insignificant, the adiabatic shear bands (ASB) and cracks around the crater are found. When the adiabatic softening is increased, the adiabatic shear bands coalesce into a wider overlapping shear deformation band, and the adjacent grains are deformed seriously, resulting in a lot of contorted bands. At the end of the penetration process, there are a lot of microbands. The process of bullet oblique impact penetration into the 7039 aluminum alloy can be simulated effectively using Johnson-Cook constitutive model described by Largrane.
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