A study on mechanical properties and a constitutive model of a welded steel plate under dynamic load

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (8) : 269-277.

ZHANG Chunhui1, ZHANG Fei1,2, ZHANG Lei1, WANG Zhijun2

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Abstract

To study the mechanical properties of marine welded steel sheets under dynamic load, this study carried out quasi-static tensile tests, high temperature tensile tests and SHPB dynamic compression tests of typical marine welded steel base metals, welds and heat affected zones. The mechanical behavior of welded steel materials under different stress states was analyzed. Based on the mechanical properties test results, a constitutive models of welded steel base metal, weld and heat affected zone materials were fitted. The results show that under quasi-static conditions, the yield strength and tensile strength of the weld and heat affected zone materials are larger than that of the base metal and the elongation is smaller than that of the base metal. At high strain rate, the ability of the material in the heat-affected zone to resist plastic deformation is significantly stronger than the other two materials, and the ability to resist plastic deformation increases with strain rate. The welded plate base metal, weld and heat affected zone materials all exhibit strain rate effects and temperature effects. The heat affected zone is the area where the impact properties of the welded plate are relatively weak. The established Johnson-Cook model can describe the mechanical properties of welded steel plates under blast load.

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ZHANG Chunhui1, ZHANG Fei1,2, ZHANG Lei1, WANG Zhijun2. A study on mechanical properties and a constitutive model of a welded steel plate under dynamic load[J]. Journal of Vibration and Shock, 2021, 40(8): 269-277

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