标准霍普金森压杆配置下的应力波分离及无时限实验数据处理  

Stress wave separation based on standard Hopkinson pressure bar set-up and unlimited duration of experiment data processing

作　　者：宋力[1] 钟东海 SONG Li;ZHONG Donghai(Key Laboratory of Impact and Safety Engineering,Ministry of Education,Ningbo University,Ningbo 315211,Zhejiang,China)

机构地区：[1]宁波大学冲击与安全工程教育部重点实验室,浙江宁波315211

出　　处：《爆炸与冲击》2023年第12期80-93,共14页Explosion and Shock Waves

摘　　要：在经典一维应力波理论基础上以及试件受力平衡假定成立的条件下,提出了一种在标准霍普金森压杆实验配置下实现杆中左、右行应力波分离的新方法,可简单有效地解决常规霍普金森压杆在长时实验时左、右行波信号重叠的问题,从而保证实验中的全部应变测试数据都可以加以利用,显著提高了霍普金森压杆的测试能力。给出了新的基于杆中左、右行应力波信号的实验数据处理公式。作为霍普金森压杆实验中经典数据处理公式的扩展,在测试信号不需要进行波分离处理的情况下,新的数据处理公式等同于经典公式。利用ABAQUS有限元软件对霍普金森压杆实验进行了数值模拟,采用虚拟实验的方式,利用模拟测试点的应变信号进行了多种实验条件下的数据处理,对该应力波分离方法的有效性及误差进行了验证与评价。数值模拟结果表明,该应力波分离方法可以给出很好的数据处理结果。在标准霍普金森压杆上进行了部分实验并利用新的波分离方法及公式对数据进行处理,所得结果令人满意。Based on the classical one-dimensional stress wave theory and the assumption of force equilibrium of the specimen,a new method for separating left-going and right-going stress waves on the standard Hopkinson pressure bar set-up is proposed.It can solve the problem of left-going and right-going stress wave signal overlapping in a standard Hopkinson pressure bar used for a long-duration experiment effectively and with simplicity.By introducing virtual strain measuring points at the specimen end of the incident bar and the free end of the transmission bar,the separation problem of stress waves in each bar which using only one strain gage is transformed into the two-point wave separation problem and then the separation of the left and right traveling stress waves is conveniently accomplished.In principle,this new method allows unlimited duration of test data analysis thus the overall experimental process can be analyzed.It thereby significantly enhances the test ability of the standard Hopkinson pressure bar.New experimental data processing formulas based on the left-going and right-going stress wave signals are presented.They are actually the generalizations of the classical data processing formulas.These new formula are equivalent to the classical formulas when the wave separation processing is unnecessary.Full model simulations of the split Hopkinson pressure bar experiment were carried out on the ABAQUS/Explicit finite element simulation platform.The simulated strain signals at the test positions then are processed in the way of virtual experiment under various experimental conditions.Based on this,the effectiveness and errors are verified or evaluated.The simulation result shows that this new stress wave separation method can give a good data processing result.Some experiments were carried out on a standard Hopkinson pressure bar apparatus with a 1-m-length incident bar and a 1-m-length transmission bar.The new wave separation technique and data process formulas were used.For the 2014 aluminum alloy test,the spe

关 键 词：霍普金森压杆 应力波信号重叠 应力波分离 数据处理 

分 类 号：O347.4[理学—固体力学]