Numerical and experimental investigation on the collision resistance of the X-core structure

Abstract

This paper analyses the collision resistance of the X-core structure. The analysis includes a detailed investigation of the non-linear plate and laser weld material behaviour using optical, full-field strain measurements. The resulting material relationships are implemented into the finite element model. Furthermore, the finite element model includes the influence of the ship motions to accurately predict the collision resistance. The verification of the numerical results is done by a comparison of the experimental and numerical force versus penetration curves and by a comparison of the deformed geometries. The latter is achieved through a digitised three-dimensional model of the post-experimental X-core structure. As a result, the accuracy of the collision simulations is presented and discussed.

A combined numerical and semi-analytical collision damage assessment procedure

“…Additionally, the accuracy of the force versus penetration curves is believed to be very good due to the high accuracy achieved with the employed material model including failure; see [13]. In the future, this can further be strengthened with a full three-dimensional coupled numerical simulation according to [7] as applied by [17] for large-scale collision experiments.…”

Numerical investigations of collision experiments considering weld joints

“…elements between inner and outer shell viewing on the cross section of a double hull structure. They are proven to increase the crashworthiness in several experiments and numerical investigations [3,4]. Another approach to increase the capability of a double hull structure to absorb energy is to fill it with filling materials like hollow glass spheres as reported by Schöttelndreyer et al [5].…”

“…Furthermore, most of the energy is absorbed in the stiffened plates of the ship structure in a collision accident and not in the weld joints. Ehlers et al [3] treated laser welds in a numerical investigations with LS-Dyna of a large-scale specimen with an X-core design as spot welds and used the same modeling technique of weld joint constraint as Peschmann and Törnqvist. They used an equivalent plastic strain e f as a limiting value for the constraint and showed the influence of the failure strain e f on the global response of the structure.…”

Load-carrying behaviour of web-core sandwich plates in compression

“…Steel sandwich plates are light-weight structures which can save space and improve safety; see Naar et al [1], Ehlers et al [2]. Their stiffness-to-weight and strength-to-weight ratio are higher than those of stiffened plate when bending is concerned.…”