Page 248 - Handbook of Materials Failure Analysis
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244 CHAPTER 10 A reliable analysis method
(a)
(b)
FIGURE 10.1
Large excavators used for surface mining: (a) mining dragline and (b) mining shovel.
(www.miningmayhem.com). The boom failure was caused by the dynamic stress
loading coming through the tight drag and hoist ropes. In recent years, seven large
shovel and three walking draglines had experienced some boom or tri-structure lacing
cracking not long after going into service, which resulted in the maintenance casts ran-
gedbetween$20and$130million[1–12].Therefore,itisimportanttoensuretheexca-
vator longevity and reduce the high capital investment. Researchers had tried to find
