The Spallation Characteristics of Al under Ultra-High Strain Rate Loading Driven by Femtosecond Laser
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摘要: 层裂损伤是材料动态损伤破坏研究中最重要的问题之一，其损伤特性和机制随加载应变率不同表现出明显的阶段性规律。超高应变率条件下材料层裂损伤特性、规律和机制研究已成为极端条件下材料动态响应研究的重要内容，在工程应用和基础研究领域均有重要意义。采用飞秒激光驱动冲击加载技术开展了超高应变率条件下铝材料的层裂损伤实验研究，利用啁啾频域干涉超快诊断方法对铝材料的层裂损伤过程进行了诊断，分析并获得了在109 s−1应变率条件下铝材料的层裂强度约为7 GPa，结合前人的研究数据，解读了铝材料层裂强度随应变率的变化规律。Abstract: Spall fracture is one of the most important issues in the study of dynamic damage for materials. The damage characteristics and mechanism show obvious phased rules with different loading strain rates. At present, the study on spallation characteristics, laws and mechanisms of materials under ultra-high strain rate has become an important part of the research on dynamic response characteristics of materials under extreme conditions, and is of great significance in the field of engineering application and basic research. In this paper, the spallation experiment of aluminum under femtosecond laser driven shock loading is carried out. The velocity profile on free surface of aluminum is measured by using the self-designed ultrafast chirped frequency domain interferometry system. The spallation strength of aluminum under 109 s−1 strain rate is about 7 GPa, and the variation of spallation strength with strain rate is analyzed.
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Key words:
- femtosecond laser /
- ultra-high strain rate /
- aluminum /
- spallation
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图 3 铝样品自由面位移随时间的变化曲线
Figure 3. Free surface displacement history curves of Al samples obtained by multiple experiments
图 4 飞秒激光加载下铝的自由面位移曲线(a)和速度剖面(b)
Figure 4. Displacement curve (a) and velocity profile (b) of Al sample on free surface loaded by femtosecond laser
图 5 铝材料层裂强度随应变率的变化
Figure 5. Variation of spalling strength of aluminum with strain rate
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