The fracture energy can be calculated bydividing the work done for performing the fracture process (the area under the force鈥揹isplacement curve) by the fractured zone area. The area of fractured zone is determined by multiplying the thickness of the specimen by the length of the portion without having a notch, as shown in Fig. 7.8.
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How to determine the fracture energy of a specimen?
To determine the fracture energy of a specimen, a 3-point bending test is completed on a notched beam. A notch is included to represent an existing crack or defect. Fracture mechanics studies the propagation of cracks and therefore an existing crack/defect has to be simulated. The test specimen is shown in Figure 21.
What is the fracture energy of a crack?
The energy required to do this is called the fracture energy and is described as the energy required to crack a unit surface area. There are three main modes of crack propagation 1) opening 2) In-plane shear 3) out of plane shear. The failure mode considered in this investigation will be mode 1 i.e. the opening of a crack.
What is the fracture energy of a percolation fracture?
Both 蟽 m and S are rate dependent and in the simplest case, the fracture energy is determined by GIc = 蟽 m 未 m, where 未 m is the critical crack opening displacement. Both 蟽 m and 未 m depend on the interface structure and the microscopic deformation mechanisms controlling the percolation fracture process via disentanglement and bond rupture.
What is the meaning of fracture mechanics?
Fracture mechanics is the field which studies the propagation of cracks i.e. determining whether a pre-existing crack can grow. The energy required to do this is called the fracture energy and is described as the energy required to crack a unit surface area.