Transactions of Materials and Heat Treatment

Title：Analysis on energy absorption characteristics of high strength steel based on drop hammer crush test

Authors： Zhang Wei Li Chunguang Wei Fulin Liu Lixian Yang Jianwei Chen Qing

Unit： Shougang Group Co. Ltd.

KeyWords： high strength steel energy absorption deformation mode strength drop hammer crush test

ClassificationCode：U465.1+1

year,vol(issue):pagenumber：2019,44(3):169-174

Abstract：

For duplex high-strength steel DP590D+Z, DP780D+Z and DP980D+Z, based on high-speed tensile test, the dynamic mechanical properties of three high-strength steel materials were compared and analyzed, and the influences of the strain rate change on the mechanical properties of the materials were obtained. Then, based on the drop hammer crush test of the thin-walled beam structure of high-strength steel material, the energy absorption characteristics of the material were analyzed, and the energy absorption characteristics of different impact speeds of the same material and the different materials under the same impact conditions were compared. The results show that as the strength of the material increases, the sensitivity of the mechanical properties corresponding to strain rate decreases. When the energy absorption ratio of the crushed sample is higher than 0.95, the deformation mode of the sample is crushed and wrinkled deformation. At this time, the test can accurately reflect the energy absorption characteristics of materials. Under the same impact condition, the material strength increases, and the energy absorption ratio and specific energy-absorbing of the material decrease, the average load is larger, the ultimate load is smaller, and the load is larger, which indicate the bearing capacity of the material fluctuates less and exhibit the better bearing characteristics. Thus, the change law of mechanics and energy absorption characteristics of materials with cap-beam structure is consistent with the raw material, which can be used as a reference for the materials selection of body design.

Funds：

张伟（1986-），男，博士，工程师，E-mail：zhangw@shougang.com.cn

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