EXPERIMENTAL FINDING OF YOUNG’S MODULUS OF A WELD BOX GIRDER MADE OF STEEL 09Г2С

Abstract

Purpose. Experimental finding of Young’s modulus values of the specimen of steel 09Г2С with weld longitudinal arrangement and of the basic metal, which is used for box girder manufacturing, by means of non-electrical strain measurement under various loads. Comparison of the received results among themselves and with data of references. Methods of research. Experiment, strain measurement, least-squares technique. Results. Several metal strips of steel 09Г2С arranged crosswisely have been welded for making of a specimen. The specimen of steel 09Г2С with weld longitudinal arrangement and rectangular cross-section has been produced of the received detail by milling with cooling. Tests have been executed on calibrated equipment for finding of Young’s modulus values of the weld and of the basic metal. Strains have been measured by Huggenberger tensometer during experiment. Experimental results have been processed by least-squares technique. The received results have been compared among themselves and with data of references. It has been found out, that Young’s modulus values of the basic metal on all references are comparable, but differ one from another. Young’s modulus values of the weld differ essentially. Weld Young’s modulus is a little bigger than basic metal Young’s modulus according to experimental data of other author. Weld Young’s modulus is a little smaller than basic metal Young’s modulus according to the received experimental data. This difference can be explained, in particular, by different ways of production of specimens for finding of weld Young’s modulus. Scientific novelty. Young’s modulus values of the specimen of steel 09Г2С with weld longitudinal arrangement has been experimentally found by means of mechanical strain measurement under various loads and with result processing by least-squares technique. Practical value. Experimentally found Young’s modulus values of the weld of the basic metal are necessary at physical and mathematical modelling of a stress state of a box girders of steel 09Г2С.