Annular Pulse Shaping Technique for Large-Diameter Kolsky Bar Experiments on Concrete

作者：Heard W F; Martin B E^*; Nie X; Slawson T; Basu P K

来源：Experimental Mechanics, 2014, 54(8): 1343-1354.

DOI：10.1007/s11340-014-9899-6

• Split-hopkinson pressure bar
• Pulse shaper
• High strength concrete
• High rate
• Large kolsky bar

The goal of this study is to design a novel annular pulse shaping technique for large-diameter Kolsky bars for investigating the dynamic compressive response of concretes. The purpose of implementing an annular pulse shaper design is to alleviate inertia-induced stresses in the pulse shaper material that would otherwise superpose unwanted oscillations on the incident wave. This newly developed pulse shaping technique led to well-controlled testing conditions enabling dynamic stress equilibrium, uniform deformation, and constant strain-rate in the testing of a chosen concrete material. The observed dynamic deformation rate of the concrete is highly consistent (8 % variation) with the stress in the specimen well equilibrated confirming the validity of this new technique. Experimental results at both quasi-static (10(-4) s(-1)) and dynamic (100 s(-1), 240 s(-1)) strain rates showed that the failure strength of this concrete is rate-sensitive.

• 出版日期2014-10