Research Papers: Structures and Safety Reliability

Experimental and Numerical Plastic Response and Failure of Laterally Impacted Rectangular Plates

[+] Author and Article Information
C. Guedes Soares

e-mail: guedess@mar.ist.utl.pt
Centre for Marine Technology and Engineering (CENTEC),
Instituto Superior Técnico,
Technical University of Lisbon,
Lisbon 1049-001, Portugal

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received May 20, 2012; final manuscript received April 17, 2013; published online July 15, 2013. Assoc. Editor: Myung Hyun Kim.

J. Offshore Mech. Arct. Eng 135(4), 041602 (Jul 15, 2013) (7 pages) Paper No: OMAE-12-1050; doi: 10.1115/1.4024274 History: Received May 20, 2012; Revised April 17, 2013

Experimental and numerical results of drop weight impact test are presented on the plastic behavior and fracture of rectangular plates stuck laterally by a mass with a hemispherical indenter. Six specimens were tested in order to study the influence of the impact velocity and the diameter of the indenter. The impact scenarios could represent abnormal actions on marine structures, such as ship collision and grounding or dropped objects on deck structures. The tests are conducted on a fully instrumented impact tester machine. The obtained force-displacement response is compared with numerical simulations, performed by the LS-DYNA finite element solver. The simulations aim at proposing techniques for defining the material and restraints on finite element models which analyze the crashworthiness of marine structures. The mesh size and the critical failure strain are predicted by numerical simulations of the tensile tests used to obtain the mechanical properties of the material. The experimental boundary conditions are modeled in order to represent the reacting forces developed during the impact. The results show that the critical impact energy until failure is strongly sensitive to the diameter of the striker. The shape of the failure modes is well predicted by the finite element models when a relatively fine mesh is used. Comments on the process of initiation and propagation of fracture are presented.

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Fig. 4

Force-displacement response. (a) Diameter of indenter 30 mm and different impact velocities. (b) Impact velocity 3.8 m/s and different diameters of indenters.

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Fig. 3

Deformation profile of the rectangular plates

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Fig. 2

Shape of the deformation (a) V2.7D30 (b) V3.8D30

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Fig. 1

Experimental set up

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Fig. 12

Shape of the deformation. Effective stress: (a) V2.7D30 (b) V3.8D30 (c) V3.8D20 (d) V3.8D16.

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Fig. 5

Details of finite element model

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Fig. 9

Force–displacement response (a) V2.7D30 (b) V3.3D30 (c) V3.8D30 (d) V3.8D20 (e) V3.8D16 (f) V3.8D10

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Fig. 10

Position of first failure element

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Fig. 6

Engineering and true material curves

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Fig. 7

Tensile test models

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Fig. 8

Engineering stress–strain curves obtained from tensile test simulations

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Fig. 11

Numerical stress triaxiality

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Fig. 13

Specimen V2.7D30 (a) effective stress (b) effective plastic strain

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Fig. 14

Deformation process of specimen V3.8D20



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