Ridgeline Strengthening and Optimization of Thin-walled Hat-section for Crashworthiness Structure

doi:10.3901/JME.2019.20.178

Abstract

Abstract: In order to meet lightweight requirement, ultra-strength steel plate has been utilized on major structures in automobiles for crashworthiness. However, both increasing yield strength and decreasing thickness can induce buckling which weakens the load-bearing capacity of the compression side of thin-walled box structure. Based on the buckling theories of plate and quarter cylindrical shell ridgeline, the load-bearing capacities of the ridgeline and the post-buckling plate on the compression side of hat-section box structure are discussed. The stress distribution and the load-bearing capacities in the cross-section of uniaxial compression plate with strengthened ridgeline are obtained in CAE simulations. Thus, the usefulness of replacing hot stamping steel components by utilizing those treated with ridgeline strengthening is confirmed for crash worthiness on major structures of passenger vehicle. In the end, further studies about the lightweight and crashworthiness for vehicle structures are discussed.

Key words: plate, cylindrical shall ridgeline, yield strength, elastic buckling, plastic buckling, hot stamping, ultimate resistance, lightweight

CLC Number:

U463

JI Ming. Ridgeline Strengthening and Optimization of Thin-walled Hat-section for Crashworthiness Structure[J]. Journal of Mechanical Engineering, 2019, 55(20): 178-187.

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