Issue 42

T.V. Tetyakova et alii, Frattura ed Integrità Strutturale, 42 (2017) 303-314; DOI: 10.3221/IGF-ESIS.42.32 306 (Fig. 3 (c)) and the original specimens with complicated geometry (Fig. 3 (d)) were carried out in order to estimate the stiffness of the loading system. We can manage (decrease) the stiffness ( LS R ) by changing the width ( с b ) and the length ( с l ) of the additional deformable part of specimens (Fig. 3 (c)). The shape of the specimen with complicated geometry is to be describe in more detail. As shown in Fig. 3 (d), there are two ‘L-shaped’ holes with a length of 0 L in the central part of the specimen, which create the system of the gauge ( 1 ) and control ( 2 ) sections; and two rectangular parts ( 3 , 4 ) on the left/right. Note that during loading, the peripheral parts 3 and 4 deform together with the central part; and increase the stiffness of the loading system ( LS R ) relatively to the gauge length of the specimen. The dimensioning specifications of the specimens with complicated geometry will be shown below. The research program includes uniaxial tension tests on flat specimens with a constant strain rate ranging from 0.33×10 −4 s −1 to 0.33×10 −2 s −1 . (a) (b) (c) (d) Figure 3 : Sketches of flat specimens used in the investigation.