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Research Papers: Materials Technology

Influence of Striker Shape on the Crack Initiation and Propagation on Laterally Impacted Thin Aluminum Plates

[+] Author and Article Information
B. Liu, R. Villavicencio

Centre for Marine Technology and
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Lisboa 1049-001, Portugal

C. Guedes Soares

Centre for Marine Technology and
Engineering (CENTEC),
Instituto Superior Técnico,
Universidade de Lisboa,
Lisboa 1049-001, Portugal
e-mail: c.guedes.soares@centec.tecnico.ulisboa.pt

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 August 29, 2013; final manuscript received March 24, 2015; published online August 13, 2015. Assoc. Editor: Myung Hyun Kim.

J. Offshore Mech. Arct. Eng 137(5), 051402 (Aug 13, 2015) (10 pages) Paper No: OMAE-13-1081; doi: 10.1115/1.4030725 History: Received August 29, 2013

Experimental and numerical results of drop weight impact tests are presented, examining the plastic response and the crack initiation and propagation of small-scale clamped rectangular aluminum plates laterally impacted by different indenter shapes. The experiments are conducted using a fully instrumented impact testing machine. The shape of the deformation of the specimens and the process of initiation and propagation of the material fracture are presented. The obtained force–displacement responses show a good agreement with the simulations performed by the ls-dyna finite element solver. The strain hardening of the material is defined using experimental data of quasi-static tensile tests and the critical failure strain is evaluated by measuring the thickness and the width at fracture of the tensile test pieces. The results show that the absorbed energy to perforate the specimens is highly sensitive to the shape of the striker. Thus, the crack propagation for each striker type is analyzed in terms of the force–displacement response. The failure modes are described by the matrix of the infinitesimal strain tensors and the shape of the deformation of the failing elements.

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Figures

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Fig. 1

Dimensions of the machined test pieces

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Fig. 2

Experimental setup

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Fig. 3

Fully instrumented Rosand IFW5 falling weight machine

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Fig. 4

Shapes of striker nose. Cylindrical striker body of diameter of 20 mm.

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Fig. 5

Deformation profile of the rectangular plates: (a) S20 and S10-20 during the first strike, (b) C20 and C10-20 during the first strike, and (c) S10-20 and C10-20 during the second strike

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Fig. 6

Details of finite element model (spherical indenter)

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Fig. 7

Engineering and true material curves

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Fig. 8

Schematic of dimensions of fractured cross section

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Fig. 9

Shape of the deformation (effective stress): (a) S20, (b) C20, (c) S10-20, and (d) C10-20

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Fig. 10

Force–displacement responses: (a) S20, (b) C20, (c) S10-20, and (d) C10-20

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Fig. 11

Position of the first failing elements: (a) S20 during the first strike, (b) C20 during the first strike, (c) S10-20 during the second strike, and (d) C10-20 during the second strike

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Fig. 12

Current material yield stress versus effective plastic strain. The histories are measured on the surface of the first failing element (Fig. 11). (1, 2): S20 and S10-20 during the first strike; (3, 4): C20 and C10-20 during the first strike; (5, 6): S10-20 and C10-20 during the second strike; and (7): true stress–strain relationship of the plate material (Fig. 7).

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Fig. 13

Strains in a three-dimensional body

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Fig. 14

Type of failure element: (a) pure tension, (b) pure shear, (c) combined tension and compression, (d) combined tension and shear, and (e) principal tension

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