Research Papers

Effect of Geometrical Discontinuities on Strain Distribution for Orthotropic Laminates Under Biaxial Loading

[+] Author and Article Information
M. A. Mateen

JNTU Hyderabad,
Hyderabad, Telangana 500085, India;
Department of Mechanical Engineering,
Nizam Institute of Engineering and Technology,
Nalgonda, Telangana 508 284, India
e-mail: abdulmateen7@gmail.com

D. V. Ravi Shankar

Department of Mechanical Engineering,
TKR College of Engineering and Technology,
Hyderabad, Telangana 500097, India
e-mail: shankardasari@rediffmail.com

M. Manzoor Hussain

Department of Mechanical Engineering,
Sultanpur, Telangana 502293, India
e-mail: manzoorjntu@gmail.com

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received September 3, 2015; final manuscript received October 30, 2015; published online December 10, 2015. Assoc. Editor: Vikas Tomar.

J. Eng. Mater. Technol 138(1), 011007 (Dec 10, 2015) (4 pages) Paper No: MATS-15-1211; doi: 10.1115/1.4032004 History: Received September 03, 2015; Revised October 30, 2015

The contemporary approach of utilizing uniaxial tests data for prediction of failure in composite materials, that are anisotropic and inhomogeneous under multi-axial loading has witnessed to be inadequate. Consequently, biaxial and multi-axial tests appeared obligatory to enhance our perceptive about the performance of these complex materials. The present paper is focused on selection of suitable geometry for the test coupons required under biaxial loading. The specimen with (1) uniform stress about the gauge section, (2) failure in the gauge section, and (3) preventing the undesired nonuniform strain distribution due to stress concentration is selected. Finite element analysis (FEA) is implemented on the cross shape (╬) specimen with different undercuts and holes with different stress ratios ranging from (σx:σy) = 1:1, 1:0.5, 1:0.75, 1:−0.25, 1:−0.5, and 1:−0.75 are applied on the four edges of the specimen for selection of suitable geometry.

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Fig. 1

Boundary conditions of the cruciform specimen

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Fig. 2

Stress distribution on cruciform with a round corner for (a) ratios of T–T and C–T and (b) stress ratios C–C and T–C

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Fig. 3

Stress distribution on cruciform with a spline cut and taper arm: (a) ratios of T–T and C–T and (b) ratios C–C and T–C

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Fig. 4

Stress distribution on a model with spline cut and straight arm: (a) ratios of T–T ad C–T and (b) ratios C–C and T–C

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Fig. 5

Failure locus of the three geometries




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