Stress Distribution of High Strength Thin-Shell Structure during Buckling Collapse Tokai Univ

Format:

Book

Conference/Event

Author/Creator:

Miura, Nozomu, author.

Contributor:

Kubota, Hiroaki

Yoshida, Kazunari

Conference Name:

SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

Crash safety and lightweight vehicle structure has been one of the keys in the development process of a new vehicle. A method is needed to estimate the structure strength accurately so that designers can consider high-speed crashes in their initial design process. In this study, we carried out bending analyses of thin-shell square cylinders supposed car body frames using finite element method (FEM) to investigate the effective width. The accuracy of conventional formulas, Karman's formula (Eq. 1) and Noma's formula (Eq. 2) , were verified in the case of 270-1500 MPa materials.be/b=((kπ^2 E)/(Y12(1-ν^2 ) )(t/b)^2 (1) be/b=65{Y/(t/b)^2 }^(-1/3) (2) Where, be is a effective width, b is a width of plane, E is a young's modulous, Y is a yield stress, ν is a Poisson's ratio, t is a thickness, k is a buckling coefficient. As results, the estimated effective width using Karman's formula is larger than the results of FEM analyses in all condition of this study. And a discrepancy between the results of Noma's formula and FEM results is large in the conditions of higher strength materials . Thus, these conventional formulas don't have enough accuracy to estimate the recent higher strength materials.Therefore, we proposed a new high precision formula (Eq. 3) based on these FEM results. The proposed formula is more accurate than the conventional formulas even in 1500 MPa material. This new formula improves the efficiency of a car body development.be=249.1Y^(-0.4856)t^0.8917b^0.2137 (3) On the other hand, actual frame members of a car body have holes for air conditioner ducts, for parts positioning, and so on. The effect of these holes on the stress state and effective width are not clear. In this study, we clarified the effect of a hole located in the plane potion on strength. And we found a condition to detoxify the effect of a hole using burring

Notes:

Vendor supplied data

Publisher Number:

2021-01-0294

Access Restriction:

Restricted for use by site license