Danilchuk E., Skripchenko V., Zemtsov M.
G.S. Pisarenko Institute for Problems of Strength, National Academy of Sciences of Ukraine, Kyiv, Ukraine (
LOAD-CARRYING CAPACITY OF THE TAPE LIFTING DEVICES IN THE INITIAL STATE AND AFTER ACCRUED OPERATING TIME
Abstract. 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.
Keywords: tape, 2/2 twill weave, operating time, long-term strength, load-carrying capacity, deformation, numerical modeling.
1. Lavrushin G. A. Rabotosposobnost' lent i kanatov iz sinteticheskih nitej (Working capacity of tapes and ropes of synthetic fibers). Vladivostok : Izd-vo Dal'nevost. un-ta, 1991. 202 p.
2. Peirce F. T. The geometry of cloth structure. Journal of the Textile Institute Transactions. 1937. Vol. 28, Issue 3. P. 45–96.
3. Kawabata S., M. Niwa, H. Kawai. The Finite-deformation Theory of Plain-weave Fabrics, Part I: the Biaxial-Deformation Theory. Journal of the Textile Institute. 1973. Vol. 64, Issue 1. P. 21–46.
4. Kawabata S., Niwa M. A Finite-Deformation Theory of the 2/2-Twill Weave Under Biaxial Extension. Journal of the Textile Institute. 1979. Vol. 70, Issue 10. P. 417–426.
5. Hearle J. W. S., P. Potluri, V. S. Thammandra. Modelling fabric mechanics. Journal of the Textile Institute. 2001. Vol. 92, Issue 3. P. 53–69.
6. Carvelli V. Monofilament technical textiles: An analytical model for the prediction of the mechanical behaviour. Mechanics Research Communications. 2009. Vol. 36, Issue 5. P. 573–580.
7. Boisse P., A. Gasser, G. Hivet. Analyses of fabric tensile behaviour determination of the biaxial tension–strain surfaces and their use in forming simulations. Composites Part A: Applied Science and Manufacturing. 2001. Vol. 32, Issue 10. P. 1395– 1414.
8. King M. J., P. Jearanaisilawong, S. Socrate. A continuum constitutive model for the mechanical behavior of woven fabrics. International Journal of Solids and Structures. 2005. Vol. 42, Issue 13. P. 3867–3896.
9. Danil’chuk E.L. Strukturna model' dvovіsnogo deformuvannja sarzhevih tkanin (The structural model of biaxial deformation of twill weave fabrics). Journal of Mechanical Engineering of NTUU «KPI». 2011. Vol. 63. P. 10–15.
10. Kucher N.K., Danil’chuk E.L. Deformation analysis of 2/2 twill weave fabrics. Strength of Materials. 2012. Vol. 44, No.1. P. 72-80.