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Research Papers

Response of Steel Fiber Reinforced Cementitious Composite Panels Subjected to Extreme Loading Conditions

[+] Author and Article Information
Amar Prakash

CSIR-Structural Engineering Research Centre,
Taramani,
Chennai 600113, India
e-mail: amar@serc.res.in

S. M. Srinivasan

Department of Applied Mechanics,
IIT Madras,
Chennai 600036, India
e-mail: mssiva@iitm.ac.in

A. Rama Mohan Rao

CSIR-Structural Engineering Research Centre,
Taramani,
Chennai 600113, India
e-mail: arm@serc.res.in

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received June 10, 2016; final manuscript received December 16, 2016; published online February 9, 2017. Assoc. Editor: Taehyo Park.

J. Eng. Mater. Technol 139(2), 021019 (Feb 09, 2017) (7 pages) Paper No: MATS-16-1178; doi: 10.1115/1.4035705 History: Received June 10, 2016; Revised December 16, 2016

Application of steel fiber reinforced cementitious composites (SFRCC) in the construction of protective structures against extreme loading conditions, such as high-velocity impact and blasts, is an active area of research. It is a challenging task to capture the material behavior under such harsh conditions where strain rate of loading exceeds beyond 104 s−1. In this paper, an effort is made to simulate numerically the multihits of short projectiles on SFRCC panels. A total of 90 numbers of SFRCC panels consist of various core layer materials, thicknesses, fiber volumes, and angle of obliquity, are tested under high-velocity impacts of short projectiles. In numerical simulations, the boundary conditions and impact loading sequence are maintained, similar to that used during impact tests. In order to carry out a realistic numerical simulation, in-service munitions and ammunitions are used. The numerical response is found to corroborate with experimental results. It is observed that, if two consecutive hits are made within a distance of ten times the diameter of the projectile, then it is considered a case of multihit, else, it is considered as single hit case. The damage contours based on effective plastic strain are found to correlate with impact-tested SFRCC panels.

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Figures

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Fig. 1

Plan and cross section of SFRCC panels: (a) SFRCC panel and (b) cross sections at A–A

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Fig. 2

P-alpha equation of state (relation between pressure and density)

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Fig. 3

Responses of numerical simulation of multihit cases on SFRCC panels with 10% fiber volume subjected to impact of 7.62 mm caliber projectile: (a) after first hit at center, (b) after second hit, (c) after third hit, (d) section at dotted line, and (e) section at dashed line

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Fig. 4

Comparison of damage in SSS type panel under multihits of 5.56 mm projectile: (a) damage contours for front face, (b) front view of tested panel, (c) damage contours for the section at dotted lines, and (d) actual panel after cutting along dashed line

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Fig. 5

Typical terminology used for the measurement of damaged SFRCC panels

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Fig. 6

Kinetic energy variation during multihits of 5.56 mm projectile

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Fig. 7

SFRCC panel (10% fiber Vf) after three hits of 7.62 mm projectile: (a) tested panel, (b) damage contours, and (c) kinetic energy dissipation

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Fig. 8

Comparison of internal damage (along the dashed line in Fig. 7) under multi-impact of 7.62 mm projectile

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