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Research Papers

Detecting Changes in Fiber Orientation in a Simulated Chopped Fiber Plate Using Curvature Mode Shapes

[+] Author and Article Information
Janette J. Meyer

Laboratory for Systems Integrity
& Reliability (LASIR),
Vanderbilt University,
566 Mainstream Dr., Suite 700,
Nashville, TN 37228

Douglas E. Adams

Laboratory for Systems Integrity
& Reliability (LASIR),
Vanderbilt University,
566 Mainstream Dr., Suite 700,
Nashville, TN 37228
e-mail: janette.j.meyer@vanderbilt.edu

1Corresponding author.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received December 21, 2017; final manuscript received February 26, 2018; published online March 19, 2018. Assoc. Editor: Junlan Wang.

J. Appl. Mech 85(5), 051009 (Mar 19, 2018) (8 pages) Paper No: JAM-17-1692; doi: 10.1115/1.4039479 History: Received December 21, 2017; Revised February 26, 2018

The use of chopped fibers in the manufacturing of carbon fiber composite parts is becoming more popular in order to reduce production costs, especially in the automotive, wind, and gas storage industries. The orientation of the fibers in a chopped fiber part is important because the material properties of the part depend upon it. Phenomena such as shear alignment can result in undesired material properties, and therefore, a method for detecting the presence of undesired fiber orientations is needed. In this paper, a metric based on a part's curvature mode shapes is developed to identify the presence and location of fibers whose orientation is different from that of a desired alignment. A proof-of-concept experimental analysis shows the effectiveness of the metric at locating a region in a carbon fiber laminate plate that has been modified by rotating the fibers 90 deg. A finite element model is also developed to validate the experimental results and explore other modification scenarios. In each case, the metric is effective in identifying areas in which fiber alignment changed relative to a baseline model. In one case, a change as small as 3 deg was identified.

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Copyright © 2018 by ASME
Topics: Fibers , Mode shapes
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Figures

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Fig. 1

Modified carbon fiber plate used in experimental testing: (a) full view of plate and (b) close up of the rotated fibers

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Fig. 2

Experimental setup for impact testing: (a) layout of impact points and (b) schematic of boundary conditions

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Fig. 3

MAC results comparing B1 to (a) itself, (b) B2, and (c) M1

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Fig. 4

Curvature mode shape-based metric (Δ) comparing B1 to (a) B2 and (b) M1 using the 17 modes determined from experimental testing

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Fig. 11

((a)–(c)): Orientation of fibers (in degrees) within the indicated squares for each model of the simulated chopped fiber plate. Colored boxes indicate that fiber orientation was changed (if necessary) to 0 (blue) or 45 (yellow) in the modified model to simulate shear alignment. Curvature mode shape-based metric (Δ) comparing (d) P1 to the modified P1 model, (e) P2–P1, and (f) P3–P1. All Δ values were calculated using modes 1–5.

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Fig. 10

Curvature mode shape-based metric (Δ) comparing a baseline model to modified models in which fibers in the center square are oriented at the indicated angles measured relative to the 0 deg used in the baseline model. Modes 1–5 were used in the Δ calculation.

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Fig. 9

Curvature mode shape-based metric (Δ) for individual modes

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Fig. 8

(a) Schematic indicating location of rotated fibers in the modified model and (b) the curvature mode shape-based metric (Δ) comparing the baseline and modified model using modes1–5

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Fig. 7

Curvature mode shape-based metric (Δ) comparing (a) the baseline model to the modified model and (b) B1 and M1 from experimental testing using only the seven selected modes

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Fig. 6

MAC results comparing the FEA model to (a) itself and (b) B1

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Fig. 5

Select mode shapes estimated from experimental data (top row) and from finite element analysis (bottom row)

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