Figure 3
From: Biaxial stress controlled three-dimensional helical cracks
Detailed 2D and 3D images of a helical crack from different perspectives by Micro-XCT. (a) A 3D perspective image of a helically cracked spindle knot on a glass microfiber. The x–y plane is perpendicular to the fiber axis, whereas the z axis is parallel to the fiber axis. (b) 2D sectional images in the x–y plane along the z axis from one end of the fiber to the other. The arrows indicate the coiling directions of the crack. (c) A 3D perspective image of a helically cracked spindle knot resembling a spring after the glass microfiber is faded when using X-ray imaging contrast between the core and shell materials. (d) 2D sectional images in the x–z plane along the y axis. Scale bars=20 μm.
