用于软材料的中应变率LSHPB系统及应用  

An intermediate strain rate LSHPB system for soft materials and its application

作　　者：徐沛栋 倪萍 杨宝[1] 蒋震宇 刘逸平[1] 刘泽佳[1] 周立成 汤立群[1] XU Peidong;NI Ping;YANG Bao;JIANG Zhenyu;LIU Yiping;LIU Zejia;ZHOU Licheng;TANG Liqun(State Key Laboratory of Subtropical Building Science,School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China)

机构地区：[1]华南理工大学土木与交通学院亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《爆炸与冲击》2025年第3期1-10,共10页Explosion and Shock Waves

基　　金：国家自然科学基金(11932007,12372181,12072115,12072116)。

摘　　要：生物软材料大多是高含水率的超软材料,其力学性能在宽应变率范围内随着应变率的提高而非线性增强。然而由于实验条件的限制,在中应变率下对超软材料进行大变形测试显得比较困难。设计并建造了长15 m的双子弹电磁驱动长分离式霍普金森压杆(long split Hopkinson pressure bar,LSHPB)系统,可用于超软材料的大变形中应变率测试。使用该LSHPB系统和高速SHPB系统分别对硅橡胶进行了测试,比较两者的实验结果,验证了系统的可靠性。应用LSHPB系统测量了聚乙烯醇(polyvinyl alcohols,PVA)水凝胶在中应变率下的力学性能,并且结合已有的低和高应变率的数据分析,说明了中应变率动态性能测试的必要性。Biological soft materials,often with high water content and ultra-softness,display mechanical properties that nonlinearly enhance over a broad range of strain rates.However,existing experimental constraints make it challenging to perform large deformation tests on these materials at intermediate strain rates.This study introduces a 15-meter-long long split Hopkinson pressure bar(LSHPB)system,driven by a dual-bullet electromagnetic mechanism,designed for large deformation intermediate strain rate testing of ultra-soft materials.Comparative tests conducted using both the LSHPB and a high-speed SHPB system validated the reliability of the newly developed system.The LSHPB system was then applied to measure the dynamic mechanical performance of polyvinyl alcohol(PVA)hydrogel at intermediate strain rates.The results,combined with existing data from low and high strain rate analyses,underscore the necessity for intermediate strain rate dynamic performance testing.This work not only broadens our understanding of the mechanical behavior of ultra-soft materials like PVA hydrogel across various strain rates but also introduces an innovative experimental technique for studying materials under intermediate strain conditions,thereby advancing the field of soft material dynamics.

关 键 词：中应变率测试 LSHPB系统 PVA水凝胶 动态力学行为 

分 类 号：O347.3[理学—固体力学]