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References in periodicals archive ?
in which [[sigma].sub.t] (MPa) is the tensile stress normal to the crack direction under opening fracture mode; [f.sub.t] (MPa) is the concrete uniaxial tensile strength; [c.sub.1] = 3.0 and [c.sub.2] = 6.93 are material constants determined from the tensile tests of concrete; [[omega].sub.t] (mm) is the crack opening displacement; [[omega]] (mm) is the crack opening displacement at the complete loss of tensile stress and given as
During the experiment following signals were registered: load (F), displacement (u), crack opening displacement (COD).
Meanwhile, with the growth of the microvoid, the microcrack shall bear more local stress concentration under the same load condition; therefore, there shall be larger crack opening displacement and the graphite is more likely to be damaged.
The results of the stress analysis in direction 11 are shown in Figure 10, where the shortcut COD is crack opening displacement. The maximum stress of the numerical simulation with linear hexahedral elements and with mesh size 1 mm was 154.46 MPa.
The AE source model used in the coupling formulation is determined from the exact solution of the crack opening displacement as a function of the initial and final crack length and the crack propagation velocity.
Relationships of the force F and crack opening displacement [[delta].sub.I] of the specimen with initial crack were obtained during the test (Fig.
In this case the bond-slip of the fibre [delta] on the side of the shorter embedment is equal to the crack opening displacement ([delta] = w).
Here, the crack opening displacement (COD) was assumed to be 0.3 [micro]m from the relationship of stress intensity factor and COD [8].
This work also considers partitioning of the work of fracture parameters into yielding and necking/tearing components and further examines the reliability of crack opening displacement (COD) as an alternative method of determining [w.sub.e] and its components.
In this area, the stress of the surface area is not 0, whereas the stress is a function monotonically decreasing with the crack opening displacement. This is called material softening.
Crack opening displacement (COD) of specimens were also measured by clip gage.
For convenience, the crack opening was characterized using the load line crack opening displacement ([COD.sub.LL]), that is the displacement of the loading points during the tests.