Three-point bending drop collision test method and device for equivalently simplifying beam

Abstract

The invention discloses a three-point bending drop collision test method and device for equivalently simplifying beam and belongs to the collision test field. The three-point bending drop collision test method includes that selecting different types of alternative materials of a post B in a side collision finite element model of an automobile; analyzing and calculating the side collision finite element model under an initial collision speed to obtain collision energy absorbed by each kind of alternative material; calculating the average value of the collision energy absorbed by all the alternative materials; obtaining the average energy absorption level of the post B when using different types of materials; reversely calculating equivalent drop weight according to an energy equivalence formula; using the section size of the middle of the post B as the section size of the equivalent beam, building a geometrical model and a finite element model corresponding to the drop test according to the equivalent drop weight, and confirming test piece restraining ways after performing simulation calculation so as to enable the maximum displacement thereof to get as close as possible to the intrusion amount of the post B in the side collision; reasonably selecting materials of the post B so as to enable the post B to be more effectively used for the side collision safety design for the automobile.

Description

technical field [0001] The invention belongs to the field of collision tests, in particular to a part collision characteristic test which can be simplified into beam three-point bending characteristics for automobile B pillars and the like. Background technique [0002] With the successive promulgation of more and more automobile safety regulations and the higher and higher requirements of users for automobile safety, the design of complete automobiles, key safety components and related systems is becoming more and more complex. At the same time, due to the improvement of energy-saving standards, how to reduce the weight of automobiles under the premise of ensuring automobile safety has become an urgent problem in the automobile industry. [0003] In order to achieve lightweight without reducing the safety of automobiles, new materials such as advanced high-strength steel and aluminum alloys are being used more and more in automobiles. [0004] Automobile design engineers n...

AI Technical Summary

Problems solved by technology

As for how to rationally simplify the B-pillar into a straight-wall beam structure, there is no relevant research literature

[0008] The quality of the impact hammer head used in the three-point bending drop weight test is arbitrarily determined by the test personnel, and the current drop weight testing machine is mainly used for the crashworthiness test of civil structures, and the quality of the drop weight is often relatively large. During the crashworthiness test of auto parts, it is easy to smash the parts flat, so that the deformation of the B-pillar during the test is very different from that of the real vehicle. Point bending drop weight test conditions

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