LOAD-CARRYING CAPACITY OF THE TAPE LIFTING DEVICES IN THE INITIAL STATE AND AFTER ACCRUED OPERATING TIME
DOI:
https://doi.org/10.20535/2305-9001.2012.66.38290Keywords:
tape, 2/2 twill weave, operating time, long-term strength, load-carrying capacity, deformation, numerical modelingAbstract
Deformation and strength of the tape lifting devices of various designs in the implementation of real operating conditions are investigated. Actual tests of slings under static and cyclic loading are conducted, and the effect of overloading on their carrying capacity is determined.
Tests of disposable synthetic tape lifting devices under cyclic loading have shown that they can withstand at least 15 cycles of loading-stay under load-unloading at the maximum load that exceeds the allowable operational value in 2 times. The results of static tests indicate that maximum destructive loads exceed the allowable ones in 4,3 ... 4,5 times.
Numerical modeling of deformation of woven synthetic tapes of investigated slings is carried out. The structural models to predict the deformation behavior of twill weaves are applied. These models are developed on the basis of the biaxial tension theory of woven fabrics. Experimental nonlinear deformation curves of threads and the main structural characteristics of the tapes are used as input parameters of the models. Efficiency of the models is proved by a good correlation between calculated and experimental data.
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