本文選題：沖擊壓縮　切入點(diǎn)：氧化鋁陶瓷　出處：《物理學(xué)報(bào)》2016年16期 　論文類型：期刊論文

【摘要】：利用一級(jí)輕氣炮開(kāi)展了不同厚度氧化鋁陶瓷樣品的平板沖擊壓縮實(shí)驗(yàn),并借助激光速度干涉儀(VISAR)測(cè)試了樣品的自由面速度歷程.根據(jù)自由面速度歷程確定了不同厚度氧化鋁陶瓷樣品的Hugoniot彈性極限值,結(jié)果顯示,沖擊壓縮下氧化鋁陶瓷中存在彈性前驅(qū)波衰減現(xiàn)象.進(jìn)一步基于氧化鋁陶瓷的細(xì)觀結(jié)構(gòu)掃描電鏡(HEL)圖像,分析了氧化鋁陶瓷的細(xì)觀結(jié)構(gòu)特征,構(gòu)建了含晶相、玻璃相等細(xì)觀特征的力學(xué)模型.數(shù)值模擬沖擊壓縮加載下氧化鋁陶瓷細(xì)觀結(jié)構(gòu)的力學(xué)響應(yīng)過(guò)程,從細(xì)觀層次上分析了彈性前驅(qū)波衰減現(xiàn)象的產(chǎn)生機(jī)理,指出沖擊壓力低于HEL時(shí)材料的細(xì)觀損傷引起的能量耗散以及前驅(qū)波在細(xì)觀結(jié)構(gòu)晶界處反射和透射引起的能量分散過(guò)程是其產(chǎn)生的主要原因.
[Abstract]:The plate impact compression experiments of alumina ceramic samples with different thickness were carried out by the first-order light gas gun. The free surface velocity history of the samples was measured by using the laser velocity interferometer (VISAR). According to the free surface velocity history, the Hugoniot elastic limit values of alumina ceramic samples with different thickness were determined. The results show that, The phenomenon of elastic front wave attenuation exists in alumina ceramics under impact compression. Based on the SEM images of alumina ceramics, the microstructure characteristics of alumina ceramics are analyzed, and the crystalline phases are constructed. The mechanical response process of alumina ceramic meso-structure under shock compression loading was numerically simulated. The mechanism of elastic front wave attenuation was analyzed from the meso level. It is pointed out that the energy dissipation caused by the meso-damage of the material and the energy dispersion caused by the reflection and transmission of the precursor wave at the grain boundary of the mesoscopic structure are the main reasons for the energy dissipation when the impact pressure is lower than HEL.
【作者單位】： 中國(guó)工程物理研究院總體工程研究所;
【基金】：國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):11502258,11272300) 中國(guó)工程物理研究院科學(xué)技術(shù)發(fā)展基金(批準(zhǔn)號(hào):2014B0101009)資助的課題~~
【分類號(hào)】：O343
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本文編號(hào)：1610444