Mathematical Problems in Engineering / 2017 / Article / Fig 9

Research Article

Surface Crack Detection in Prestressed Concrete Cylinder Pipes Using BOTDA Strain Sensors

Figure 9

Stress–strain curves of concrete and cement mortar: (a) concrete under compression, (b) concrete under tension, (c) mortar under compression, and (d) mortar under tension.
(a)
(b)
(c)
(d)

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