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The description of material behavior is one of important information for its application in civil engineering. One area is covering fracture mechanical properties. For evaluation of the fracture toughness values, the knowledge of calibration curve is important. The paper is aimed on the numerical modelling of the test specimens with a chevron notch...
Contexts in source publication
Context 1
... for the ductile materials, the initial notch in the form of chevron (V-shape) notch was designed (since 1964 [2,3,4]). It allows crack propagation to be directly in the central plane direction of the test specimen because the crack initiates from the sharp edge of the chevron notch (see Fig. 1 and 2). This type of initial notch can be used both for oval shape and rectangular/cube Fig. 1: Various configurations of a chevron notch usage on different types of test specimens, adopted from [3] shape test specimens. ...
Context 2
... pilot study was conducted by using FE software ANSYS [12]. The element type PLANE82 (8 nodes element) was used to consider the stress singularity at the crack tip (with the option KSCON [12,13,14]). The basic dimension for numerical model was created according the 3PB geometry with initial chevron notch geometry (see Fig. 2). The specimen's dimensions: length L = 220 mm, span of supports S = 170 mm, breadth B = 75 mm, width W = 75 mm, S/W = 2.27, initial crack length a 0 = 12 mm, a 0 /W = 0.16, the angle of chevron notch is 90° [10]. Cross section area of the rectangular shape profile was formed by 75 mm ...
Citations
... n condition used for calculation of geometry functions Y and to calibrate the 3D numerical model. This model corresponds to the straight through crack case, where boundary conditions are shown in Fig. 6. The other one was modeled with plane stress conditions to simulate non-uniform thickness of the notch layer along the height of the cross section Sobek et. al. (2017). Each layer varied in thickness (real characteristic in FE code). In total, 30 layers were used, because it was shown in Sobek et. al. (2018) that solutions with more than 10 layers provide accurate and stable numerical calculation. For illustration, the division of the cross section area into 11 specific layers is shown in Fig. 7. The ...
In the contribution, normalized stress intensity factors for three- and four-point bending specimens with a chevron notch is introduced by varying the chevron notch angle and length. The three- and two-dimensional models of bent chevron notched specimens in the software ANSYS were prepared by using possible symmetrical conditions. The 2D model was used with variable thicknesses of the layers representing the characteristic shape of the chevron notch (with the plane stress boundary condition). The numerically obtained results from the 2D and 3D solutions are compared with data from literature.
