Dynamic Splitting Tensile Strength of SFRC An Experimental and Numerical Investigation

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Title: Dynamic Splitting Tensile Strength of SFRC An Experimental and Numerical Investigation

Author(s): T. S. Lok and G. Lu

Publication: Special Publication

Volume: 216

Issue:

Appears on pages(s): 129-142

Keywords: dynamic splitting tensile test; impact; split Hopkinson pressure bar; steel fiber reinforced concrete (SFRC)

Date: 10/1/2003

Abstract:
This paper reports on a series of dynamic splitting tensile tests on 70 mm diameter cored concrete and steel fiber reinforced concrete (SFRC) specimens at moderate strain rates. A modified split Hopkinson pressure bar (SHPB) was specifically developed to test such large diameter heterogeneous specimens. Details of the modified SHPB and a novel striker bar are presented. Dynamic strength magnification of up to 4.5 times the static strength at moderate strain rate was obtained. For the SFRC specimens, hooked-end steel fibers were used with 0.3% fiber volume concentration. A high-speed camera with framing rate up to 106 frames per second was used to record the crack propagation mechanism and the progressive fracture of the specimens in tests. Numerical simulation of the test is briefly presented and discussed. Good approximation of the response is obtained.