Bumper Reinforcement With Open Cross Section

Abstract: The present invention comprises a top panel (210), two walls (211, 222), and two ridge sections (231, 232), the tensile strength of the top panel (210) and the walls (221, 222) is 1470 MPa or greater, each of the two ridge sections (231, 232) extends in the lengthwise direction of the top panel (210) between the top panel (210) and each of the walls (221, 222), a cross section in the center of the lengthwise direction is a trench-shaped open cross section, the top panel (210) comprises, at the widthwise center thereof, a center trench (260) extending in the lengthwise direction in the cross section, the top panel (210) comprises small trenches between the center trench (260) and each of the ridge sections (231, 232) in the cross section, the depth of trench in the center is 15-25 times inclusive of the sheet thickness of the top panel (210) in the cross section, the depth of the small trenches (240, 250) is 2-13 times inclusive of the sheet thickness of the top panel (210), and the spacing between the small trenches (240, 250) and the ride sections (231, 232) is smaller than or equal to 30 times of the sheet thickness of the top panel (210).

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