飞秒激光驱动超高应变率加载下铝材料的层裂特性  

The Spallation Characteristics of Al under Ultra-High Strain Rate Loading Driven by Femtosecond Laser

作　　者：辛建婷[1] 席涛[1] 范伟[1] 何卫华[1] 李纲[1] 赵永强[1] 税敏[1] 储根柏[1] XIN Jianting;XI Tao;FAN Wei;HE Weihua;LI Gang;ZHAO Yongqiang;SHUI Min;CHU Genbai(Laboratory of Science and Technology on Plasma Physics,Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621999,Sichuan,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心等离子体物理重点实验室,四川绵阳621999

出　　处：《高压物理学报》2022年第3期57-63,共7页Chinese Journal of High Pressure Physics

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10^(9)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。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 10^(9)s^(−1) strain rate is about 7 GPa,and the variation of spallation strength with strain rate is analyzed.

关 键 词：飞秒激光 超高应变率 铝 层裂 

分 类 号：O347.1[理学—固体力学] TB31[理学—力学]