Innovative Production Machines and Systems Conference

Another Example shall support the statement of increase in efficiency and point on the displacement of critical load cases: by the constriction of the wire the shell of hoisting drums get strain loads in circumference direction. The material information promise for this region a duplication of the load carrying efficiency by loads in plastic deformation regions. Practically hoisting drums will be predeformed in running-in-tests and will be trained for higher loads. In contrast to the previous example the material attribute „strain-stress-behaviour“ is modified by the elastic-plastic first load so that following working loads come upon a linear-elastic strain behaviour with a higher elastic limit. Irreversible deformations are the result of the training, the working loads come upon a modified geometry of the part. The rigid limit becomes higher and because of that the construction of the hoisting drums has to consider other cases of loss. Obliquely positioned due to plastic deformations causes to bearing damages or is the reason for engagement failures in the drive section Plastic axial deformation of the hoisting drum add to bearing failures Passage from plastic to elastic deformation in the region of the drum plates add to initial loads and to an increase of stress concentration Illegal deformations exceeding the construction space can be found at the end plates. In case of obliquely positioned braking discs the brake function is damaged. There is no doubt concerning the thesis mentioned in the introduction that only a modification of material attributes dues to an increase of the load carrying capacity. In case of the bolt to link plate connection the increase because of the modified material behaviour has no consequences to the fulfilment of the function. In contrast the hoisting drum shows function defects as a result of the plastic deformation. Thus limits the application of this „2 material combination“ considering to new damage criteria.