レーザ誘起衝撃波を用いた航空宇宙材料の衝撃破壊に関する研究

激光诱导冲击波对航空航天材料的冲击断裂研究

• 批准号: 09305009
• 负责人: NAKANO Motohiro
• 金额: $ 21.25万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09305009/
• 关键词: Laser; Shock wave; Orbital debris; CFRP; Spallation; Interlaminar delamination; High-speed flaming camera; Finite element analysis; 航空宇宙材料; 層間はく離; 破壊; スポール; 超高速カメラ; 状態方程式; 超高速ガメラ

We examined hyper-velocity impact tests of CFRP (carbon fiber reinforced plastics) laminates using laser-accelerated Al flyers. Al flyers were accelerated to 6〜9km/s by irradiation of a short-pulsed intense laser beam. We succeeded in observing the deformation and fracture processes of the CFRP targets with a high-speed framing camera. It was found that the CFRP was splashed out from the collision surface of the targets. The deformation velocity of the back surface of the targets was about 100〜700m/s.After the impact experiments, we investigated damages of the CFRP target with a optical microscope, a scanning electron microscope (SEM) and a laser microscope. We found fracture surfaces of mode I type exactly on the back of the flyer impact. Damages of mode II type were observed in the back where it came off the impact point a little. Multi-interlaminar delaminations were discovered by observation of the section of the targets.The following fracture model of CFRP laminates under hyper-velocity impact loading is proposed as these results.1. A crack is initiated by spallation (Mode I)2. Then, the crack is propagated along carbon fibers by shear force (Mode II)3. Finally, fibers at the back surface were broken by tensionThree-dimensional simulations of the hyper-velocity impact were performed using the Dyna3D. We introduced the fracture mechanisms presumed from the framing images at the experiments and the damage observation of the CFRP targets. Impact deformations with spallation agreed with the experiment results qualitatively.

我们使用激光加速铝飞片检查了 CFRP（碳纤维增强塑料）层压板的超高速冲击测试。通过短脉冲强激光束的照射，铝飞行器的速度被加速到6〜9km/s。我们成功地利用高速分幅相机观察了CFRP靶材的变形和断裂过程。发现CFRP从靶材碰撞面飞溅出来。靶材背面的变形速度约为100〜700m/s。冲击实验结束后，我们利用光学显微镜、扫描电子显微镜（SEM）和激光显微镜研究了CFRP靶材的损伤情况。我们在飞行器撞击的背面准确地发现了 I 型断裂面。在其背部稍微偏离冲击点处观察到II型损坏。通过观察靶材截面发现多层层间分层。根据这些结果，提出了以下CFRP层合板在超高速冲击载荷下的断裂模型。 1．裂纹是由散裂引发的（模式 I）2。然后，裂纹通过剪切力沿碳纤维扩展（模式II）3。最后，背面的纤维因张力而断裂。使用Dyna3D对超高速冲击进行了三维模拟。我们介绍了根据实验中的分幅图像推测的断裂机制以及CFRP靶材的损伤观察。剥落冲击变形与实验结果定性一致。