摘要
为了提高分离式Hopkinson杆装置测试及其控制精度,基于一维应力波理论对Hopkinson杆测试原理进行了阐述,对测试中一维性和均匀性假设条件进行了深入分析。根据Hopkinson杆测试原理,提出了一套气推气的先进撞击杆发射装置。给出杆长与直径比大于40可保证一维性;试样中波来回反射3次以上可实现应力平衡及均匀性;气推气发射机构可以有效将0.5kg撞击杆在1MPa气压下发射65m/s;气推气发射机构与Hopkinson杆组成的测试装置操作简便、重复性好和控制精度高。
To improve the measuring and controlling precision of the split Hopkinson bar,based on one dimension stress wave theory,the measuring principle of the split Hopkinson bar is described; one dimension and uniform characteristic assumption in this technique is analysed in detail.According to the measuring principle of the split Hopkinson bar,an advanced pneumatic air-push firing equipment for the strike bar is developed.It is known that one dimension assumption can be achieved if a ratio of bar length to diameter is bigger than 40; stress equilibrium or uniform can be reached if loading stress wave inside a sample is reflected over 3 times; this pneumatic firing equipment can make weight 0.5 kg strike bar reach a 65 m/s velocity at 1 MPa air pressure.With the help of this pneumatic firing equipment,the split Hopkinson bar equipment can be easily operated,and has good repeated measuring characteristics and higher controlling precision.
出处
《机械科学与技术》
CSCD
北大核心
2010年第12期1739-1743,1748,共6页
Mechanical Science and Technology for Aerospace Engineering
基金
引信动态特性国防科技重点试验室基金项目(9140C602040803)
国家自然科学基金项目(10872169)
爆炸科学与技术国家重点实验室基金项目(KFJJ08-11)资助
