Ore Screen Failure
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Thickener Failure
Ore Screen Failure
Shaft Torsional Failure

Analysis and evaluation of weldment failures in a vibrating ore screen, selection of slides from final report

 

FIG 2 rotation at 12 oclock.jpg (135074 bytes)    

ORE SCREEN ROTATES IN CIRCULAR MOTION, GENERATING CYCLIC STRESSES IN WELDS

 

Fig 6.JPG (110948 bytes)

TYPICAL WELDMENT FATIGUE CRACKING INDICATED

 

Fig 5.JPG (177353 bytes)

FATIGUE CRACK PROPAGATION PATH INDICATED

 

FIG 10 Tensor XX.jpg (131292 bytes)

FOLLOWING EXTENSIVE FEA DYNAMIC MODLEING USING MES SOFTWARE, DESIGN CHANGES ARE CONFIRMED IN A SERIES OF MODELS, COMPARING CYCLIC STRESSES UNDER OPERATING CONDITONS

 

FIG 12 Tensor XX.jpg (148363 bytes)

STRESSES RESULTING FROM CIRCULAR MOTION OF SCREEN ARE DISTRIBUTED RATHER THAN CONCENTRATED AND LIMITED TO AREAS WHERE WELDS ARE NOT PRESENT, GREATLY REDUCING RISK OF FATIQUE CRACK  INITIATION

 

FIG 14 Tensor XX.jpg (146394 bytes)

STRESS DISTRIBUTION BASED ON RECOMMENDED DESIGN CHANGES, NO STRESS CONCENTRATIONS AT WELDMENTS

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