Herringbone/chevron pattern

FIGURE 6.36 Two types of plates for the gasketed-plate heat exchanger (a) paraUel-corrugated plate (b) cross-corrugated plate ( herringbone or chevron pattern). 

A fractographic pattern of radial marks (shear ledges) that look like nested letter V s sometimes called a herringbone pattern. Chevron patterns are typically found on brittle fracture surfaces in parts whose widths are considerably greater than their thicknesses. The points of the chevrons can be traced back to the fracture origin. 

Detailed fracture and metal failure analysis is usually a very reliable and extensive aspect of investigations of major loss incidents. For most small to medium investigations, macroscopic evaluation is typically sufficient. Macro evidence, such as indications of shear or brittle failure on fracture faces, lines showing detonation direction, and the chevron (herringbone) pattern all provide valuable clues to sequence, type, and cause of the failure.(See Figure 8-9.)... 

FIGURE 17.19 Plate patterns (a) washboard, (b) zig-zag, (c) chevron or herringbone, (d) protrusions and depressions, (e) washboard with secondary corrugations, and (/) oblique washboard. 

Run-off captured by chevron (top) or herringbone pattern (lower) secondary drains... 

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