Collision reinforcement material for vehicle

Abstract

It is an object of the present invention to provide a crash reinforcing member for a vehicle capable of preventing reduction in flexural rigidity as much as possible even if deformation progresses when a load at the time of crash of the vehicle is input. [Solution] A crash reinforcing member for a vehicle (e.g., door impact beam) includes a long body 10. The body 10 has a hat-shaped opened cross-sectional shape by connecting, with one another, a pair of walls 11, a pair of curved corners 12, a center flange 13, and a pair of outer flanges 14. The body 10 is divided into three sections P1, P2 and P3. A width (C1) of the center flange in the section P1 is wider than a width (C2) of the center flange in the section P2. A cross-sectional area of the curved corner 12 in the section P1 is narrower than a cross-sectional area of the curved corner in the section P2. A cross-sectional height (H1) of the section P1 is higher than a cross-sectional height (H2) of the section P2. The section P3 is provided as a gradually changing portion which smoothly connects the section P1 and the section P2 with each other.

Description

[0001] [reference] [0002] This application claims priority based on Japanese Patent Application (Japanese Patent Application No. 2011-065678) filed with Japan Patent Office on March 24, 2011. technical field [0003] The present invention relates to a vehicle crash reinforcement material, which is installed for the purpose of absorbing energy when a vehicle collides and reducing deformation of the vehicle body toward the inner side of the vehicle. Background technique [0004] As a crash reinforcement material for a vehicle, a door impact beam (also referred to as a door guard) mounted on an inner surface of a door of a vehicle is known. Hitherto, door impact bars in which brackets (mounting fittings) are welded to both end portions of a tubular main body have been widely used. However, in recent years, a door impact bar in which a bar main body and a bracket are integrally press-molded has become mainstream. Among such door impact bars in which the bar body and the brac...

AI Technical Summary

Problems solved by technology

[0011] However, in the case of the door impact bar in which the cross-sectional shape in the longitudinal direction from the center to the end is kept constant as in the conventional example, there is a possibility that after a load is input during a side collision, That is, a concentrated load is applied only to the input point of the load, thereby bending at the input point of the load, or deforming the wall member to open outward

Furthermore, there is a disadvantage that after the deformation centered on the input point of the load occurs, the stress concentrates only near the input point of the load to generate a plastic strain (plastic strain), and as a result, the bending rigidity decreases as the rod deforms. drop, and the reaction force drops sharply (see the comparative example described later)

For the previous car door anti-collision bar, in order to make up for the above-mentioned shortcomings, the strength of the car door anti-collision bar must be increased by making the material thicker or making the hat-shaped section larger, which will lead to an increase in manufacturing cost or Adverse conditions such as weight gain

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