本文選題：固體力學 + 沖擊壓縮　； 參考：《兵工學報》2017年12期

【摘要】：利用激光速度干涉儀VISAR測試了平板沖擊壓縮下不同厚度氧化鋁陶瓷樣品的自由面速度歷程。根據(jù)自由面速度歷程上表征"破壞波"現(xiàn)象的二次壓縮信號計算獲得了破壞波的傳播軌跡,指出陶瓷中破壞波的形成傳播機制主要由細觀力學行為控制。進一步基于氧化鋁陶瓷的細觀掃描圖像,構建了含晶相、玻璃相等細觀特征的力學模型。數(shù)值模擬了沖擊壓縮下陶瓷材料的細觀破壞過程,從細觀層次分析了破壞波的形成傳播機理。結果表明,陶瓷中破壞陣面的形成主要依賴于原生微缺陷在沖擊載荷下的快速形核擴展過程,其傳播特性滿足擴散過程。
[Abstract]:The free surface velocity history of alumina ceramic samples with different thickness under plate impact compression was measured by laser velocity interferometer (VISAR). According to the calculation of the secondary compression signal which represents the phenomenon of "failure wave" in the free surface velocity history, the propagation track of the failure wave is obtained. It is pointed out that the formation and propagation mechanism of the failure wave in ceramics is mainly controlled by the meso-mechanical behavior. Based on the meso-scanning images of alumina ceramics, a mechanical model with the equivalent meso-features of crystalline phase and glass was constructed. The mesoscopic failure process of ceramic materials under impact compression is numerically simulated, and the mechanism of formation and propagation of failure waves is analyzed from the meso level. The results show that the formation of the failure surface in ceramics mainly depends on the rapid nucleation and propagation process of the primary microdefects under impact loading, and its propagation characteristics satisfy the diffusion process.
【作者單位】： 中國工程物理研究院總體工程研究所;
【基金】：國家自然科學基金項目(11502258、11272300) 中國工程物理研究院科學技術發(fā)展基金項目(2014B0101009)
【分類號】：TQ174.1

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本文編號：1953487