Charpy key hole specimen

例句：

1. 1.The engineer designed the key hole specimen to withstand high pressure.
   工程师设计了关键孔试样以承受高压。
2. 2. The research team conducted a series of Charpy key hole specimen tests on the material.
   研究团队对材料进行了一系列的夏比冲击试验。
3. 3. The key hole specimen was carefully analyzed to determine its mechanical properties.
   对关键孔试样进行了仔细分析，以确定其机械性能。