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If out-of-band verification is to be made using the PSTN, the verifier SHALL verify that the pre-registered telephone number being used is associated with a specific physical device. Changing the pre-registered telephone number is considered to be the binding of a new authenticator and SHALL only occur as described in Section 6.1.2.
Once cracking has started, the crack continues to propagate until it either reaches the free surface or the crack encounters a defect that causes it to arrest. Crack velocities are proportional to the stress. The stress loading can range from a tensile stress to a compressive stress on a continuous basis. Figure 11. Stress-strain profiles of the interfaces between the copper and the epoxy substrate. Crack propagation occurs along the direction of the tensile stress. It shows four stages of crack propagation. Each stage is indicated by a vertical line on the stress axis. The crack propagation is via several inter-metallic transformations at the scale of one micrometer. The graph shows the first stage of crack initiation at the epoxy/copper interface. After [62]. (Online version in colour.) d2c66b5586