Elliptic Equation of Plastic Area Boundary around the Circular Laneway in Nonuniform Stress Field

<div>Evolution of the elliptical plastic area in nonuniform stress field (a = 2.5 m; C = 3 MPa; φ = 25°; P3 = 20 MPa). (a) η = 1. (b) η = 1.2. (c) η = 1.4. (d) η = 1.6.</div>

Shock and Vibration

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Figure 1

Figure 1: Elliptic Equation of Plastic Area Boundary around the Circular Laneway in Nonuniform Stress Field 