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首页> 外文会议>ASME turbo expo >TARGET SIZE EFFECTS ON FOREIGN OBJECT DAMAGE IN GAS-TURBINE GRADE SILICON NITRIDES BY CERAMIC BALL PROJECTILES
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TARGET SIZE EFFECTS ON FOREIGN OBJECT DAMAGE IN GAS-TURBINE GRADE SILICON NITRIDES BY CERAMIC BALL PROJECTILES

机译：陶瓷球对燃气轮机硅氮化物中异物损伤的目标尺寸影响

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Foreign object damage (FOD) phenomena of two gas-turbine grade silicon nitrides (AS800 and SN282) were determined at ambient temperature using impact velocities ranging from 25 to 150 m/s by 1.59-mm diameter silicon nitride ball projectiles. Targets in flexure bar configuration with two different thicknesses of 1 and 2 mm were impacted under a fully supported condition. The degree of impact damage as well as of post-impact strength degradation increased with increasing impact velocity, increased with decreasing target thickness, and was greater in SN282 than in AS800 silicon nitride regardless of target thickness. The critical impact velocity, in which targets fractured catastrophically, decreased monotonically with decreasing target thickness and was lower in SN282 than in AS800. Backside cracking was dominant in both AS800 and SN282 target specimens with a thickness of 1 mm, occurring from an impact velocity of 50 m/s. A backside cracking analysis based on the elastic foundation approach was made as a function of target thickness. Overall, FOD by ceramic projectiles was significantly greater than that by hardened metallic counterparts.
机译：在环境温度下，使用直径为1.59毫米的氮化硅球形弹丸的冲击速度范围为25至150 m / s，确定了两种燃气轮机级氮化硅（AS800和SN282）的异物损坏（FOD）现象。在完全支撑的条件下，具有两种不同厚度（分别为1和2 mm）的弯曲杆配置中的目标受到了冲击。冲击破坏的程度以及冲击后强度的下降程度随冲击速度的增加而增加，随目标厚度的减小而增加，并且与目标厚度无关，SN282中的破坏程度均大于AS800氮化硅。临界冲击速度（目标发生灾难性断裂）随着目标厚度的减小而单调减小，并且在SN282中比在AS800中更低。在冲击强度为50 m / s的情况下，厚度为1 mm的AS800和SN282目标试样均出现背面裂纹。进行基于弹性地基方法的背面开裂分析，作为目标厚度的函数。总体而言，陶瓷弹丸的FOD明显大于硬化金属弹丸的FOD。

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