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Dynamic response of ceramic shell for titanium investment casting under high strain-rate SHPB compression load

机译：高应变率SHPB压缩负荷下钛投资铸造陶瓷壳动力响应

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The mechanical performances of ceramic mold are crucial for the quality of casts in investment casting. However, most of the previous researches were focused on the quasi-static performance which is not sufficient for the accurate failure analysis of shell mold under complex stress state. In this investigation, dynamic mechanical behaviors of AI(2)O(3)-SiO2 ceramic shell for investment casting have been studied using split Hopkinson pressure bar (SHPB) at high strain rates Sand pack samples and pure slurry samples were considered for the testing in order to further understand the mechanism of fracture Weibull approach was then applied to describe the strength distribution of ceramic shells. The dynamic increase factor (DIF) of compressive strength increased from 1.23 (863s(-1)) to 2.03 (1959s(-1)) indicating the high dependency of mechanical property to strain-rate. The cross-section and fracture surface were analyzed through scanning electron microscopy (SEM). The microstructural investigations showed that the crack propagation in the ceramic shell is mainly through the weak interface between sand particles and slurry region under quasi-static load At high strain rate, the crack pro pagation path is different which extends through the well sintered slurry region and even runs through the sand particles. The mechanism of crack propagation path is analyzed based on Griffith criterion. In addition, the feature of stress-strain curves indicates the layered structure which plays an important role in the process of fracture.
机译：陶瓷模具的机械性能对于投资铸造的铸造品质至关重要。然而，以前的大多数研究专注于准静态性能，这是在复杂应力状态下壳体模具的准确失效分析不足的准静态性能。在该研究中，使用Past Hopkinson压力棒（SHPB）研究了用于投资铸件的AI（2）O（3）-SiO2陶瓷壳的动态机械行为在高应力速率砂包样品上进行了研究，并考虑了纯浆料样品进行测试为了进一步了解骨折的机制，然后施用抗裂缝方法以描述陶瓷壳的强度分布。压缩强度的动态增加因子（DIF）从1.23（863秒））增加到2.03（1959年（-1）），表明机械性能高依赖性对应变率。通过扫描电子显微镜（SEM）分析横截面和裂缝表面。微观结构研究表明，陶瓷壳中的裂纹繁殖主要是通过在高应变率的准静载荷下砂颗粒和浆料区之间的弱界面，裂纹Pro Pagation路径不同，延伸穿过井烧结的浆料区域和甚至贯穿砂粒。基于Griffith标准分析裂缝传播路径的机制。另外，应力 - 应变曲线的特征表示在裂缝过程中起重要作用的层状结构。

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