IMPACT OF DAMAGES TO WELDED JOINTS IN BASES OF POWERED ROOF SUPPORTS ON THE OPERATIONAL SAFETY

Authors

  • Marek Jaszczuk Silesian University of Technology
  • Józef Markowicz Silesian University of Technology
  • Stanisław Szweda Silesian University of Technology

Keywords:

hydraulic roof support, weld crack, operational safety

Abstract

The location and variation range of the length of damaged welds was determined on the grounds of test results on the type and size of damages to welded joints in powered roof support bases destined for repair. In the analysis of the effort of components of roof supports modeled by means of the finite elements method the impact of the length of the damages to the welds on the maximal value of reduced stresses was estimated. Cases of symmetrical and asymmetrical load used on stand tests were discussed. Due to local plasticitization of the base steel plates occurring in the course of the torsion test, elasticity and plasticity material properties were considered in the MES. Examples of designating the limit value of the length of the damaged weld at which the powered roof support maintains its operational safety were presented.

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References

Jaszczuk M., Szweda S., Markowicz J. 2009, Analysis of damage to welds of the components of powered roof supports in view of the data acquisition required for material strength calculations. [in:] Mining Mechanization and Automation, No. 4, pp. 19-24.

PN-EN 1804-1 Underground mining machinery. Safety requirements for powered roof supports. Section 1: Powered roof support components and general requirements.

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Published

2011-06-26

Issue

Vol. 30 No. 2 (2011)

Section

Articles

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