INFLUENCE OF CHANGES OF MUTUAL POSITION OF CRANE TELESCOPIC BOOM SECTIONS ON THEIR STRESS STATE

Abstract

Telescopic booms of mobile cranes belong to the most strained parts of their structure. They are subjected to essential deformations under loads. It causes arising of stresses especially in the zones of stress concentration – what in turn can lead to overstep strength limit of the applied material. In the paper, an assessment of an influence of changes of mutual position of crane telescopic boom sections (caused by telescopic movements) on its stress state has been performed. The analyses were performed by means of finite element method utilizing a three-section boom box-type model of rectangle form cross-section.