PSI - Issue 6

A.M. Bragov et al. / Procedia Structural Integrity 6 (2017) 161–167 Author name / Structural Integrity Procedia 00 (2017) 000–000

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Table 1.Parameters of the specimens

Compression

Tension

Cylinders D 0 =20мм, L 0 =20мм

Fine-grain concrete

Cylinders D 0 =20мм, L 0 =10мм Cylinders D 0 =20мм, L 0 =20мм Cylinders D 0 =15мм, L 0 =10мм

Cylinders D 0 =15мм, L 0 =10мм. Cylinders D 0 =60мм, L 0 =30мм Cylinders D 0 =18мм, L 0 =20мм

Fiber-reinforced concrete

Ceramic brick

Cylinders D 0 =18мм, L 0 =10мм

Gabbro-diabase

-

Rectangular parallelepipeds В 0 =20мм, L 0 =20мм; Rectangular parallelepipeds

В 0 =30мм, L 0 =20мм; Cylinders D 0 =20мм, L 0 =15мм

Limestone

Cylinders D 0 =20мм, L 0 =15мм

The present method assumes a homogeneous stressed-strained state of the specimen in the process of loading, elastic deformation of measuring bars and dispersion-free wave propagation. The first assumption was provided by using the recommendations from Li and Meng (2003), Zhang et al. (2009), Li et al. (2009) and can be traced by synchronized strain pulses in measuring bars (Fig. 1).

Fig. 1. Strain pulsed registered at cross-sections of the measuring bars when the specimen maintains its integrity (а) and when it totally disintegrates (b)