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Comparison of the Stress Relaxation of Biodegradable Surgical Threads Made of Mg and Zn Alloys and Some Commercial Synthetic Materials

Milenin A., Kustra P., Wróbel M., Paćko M., Byrska-Wójcik D.

Archives of Metallurgy and Materials

2019

Vol. 64, iss. 3

1139--1143

The mechanical properties of the commercial synthetic surgical threads (i.e., monofilament MonosynR and polyfilament PolysorbTM) and threads made of pure zinc and selected magnesium alloys were compared. Tensile and relaxation tests of fine fibers/wires without and with a surgical knot were performed on a Zwick 250 tensile machine and on the specially constructed tensile machine dedicated for ultra-thin samples. An about 50% decrease in the maximum tensile load was registered for both synthetic and Mg-based threads due to the presence of a surgical knot while only an about 10% decrease was documented for the zinc threads.

Mathematical model of warm drawing of MgCa0.8 alloy which considers the ductility of the material

Milenin A., Kustra P., Paćko M.

Computer Methods in Materials Science

2010

Vol. 10, No. 2

69-79

The results of experimental research analysis of MgCa0.8 magnesium alloy were presented in the present paper. Basing on experimental tests the flow stress function and the dependences among ductility strain, triaxity factor, temperature and strain rate were obtained. Experiment was performed by using the strength machine Zwick Z250. The algorithm based on inverse method was used to interpret correctly the experimental results. The FEM modelling of upsetting and tension tests were helpful to obtain conditions of material fracture phenomena. The developed models of mechanical properties were implemented into Drawing2d FEM code. The introduced approach is helpful to model the drawing process in high temperature and with respect to fracture criterion.