Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Fatigue Fracture Analysis in Drive Shafts of Chipping and Refining Machines in a Pulp and Paper Plant
Submission Author:
alexandre nakayama , pr
Co-Authors:
alexandre nakayama
Presenter: alexandre nakayama
doi://10.26678/ABCM.COBEM2019.COB2019-0275
Abstract
Fatigue failure is one of the most common and critical in mechanical components and structure, therefore its study and understanding is of vital importance for the design, operation and maintenance of industrial systems. In the cellulose pulp and paper industry, wood chipping and pulp refining are essential processes to ensure final product quality and plant productivity with equipments experimenting high loads cycles, intermittent impacts and input fluctuations. In this paper, two drive shafts, one from a wood chipper and one from a refiner that failed during operation were analyzed with focus on fracture surface interpretation in order to understand the causes and damage mechanism. The methods used to analyze the fracture surface were macro and micro fractography with complementary tests of material chemical analysis, metallographic analysis and mechanical test. It was concluded that the failure mechanism was fatigue with cracks initiation in stress concentration points closely related to surface finishing.
Keywords
fatigue, Fractography, fracture characterization
