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Title: Measurements of Mode I Interlaminar Properties of Carbon Fiber Reinforced Polymers Using Digital Image Correlation

Abstract

Numerical models based on cohesive zones are usually used to model and simulate the mechanical behavior of laminated carbon fiber reinforced polymers (CFRP) in automotive and aerospace applications and require different interlaminar properties. Here, the current work focuses on determining the interlaminar fracture toughness (G I C) under Mode I loading of a double cantilever beam (DCB) specimen of unidirectional CFRP, serving as prototypical material. The novelty of this investigation is the improvement of the testing methodology by introducing digital image correlation (DIC) as an extensometer and this tool allows for crack growth measurement, phenomenological visualization and quantification of various material responses to Mode I loading. Multiple methodologies from different international standards and other common techniques are compared for the determination of the evolution of G I Cas crack resistance curves (R-curves). The primarily metrological sources of uncertainty, in contrast to material specific related uncertainties, are discussed through a simple sensitivity analysis. Additionally, the current work offers a detailed insight into the constraints and assumptions to allow exploration of different methods for the determination of material properties using the DIC measured data. Lastly, the main aim is an improvement of the measurement technique and an increase in the reliability ofmore » measured data during static testing, in advance of future rate dependent testing for crashworthiness simulations.« less

Authors:
 [1];  [2];  [2]
  1. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Automotive Lightweighting (NCAL)
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Automotive Lightweighting (NCAL); Univ. of Maryland, College Park, MD (United States). Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Ford Motor Company, Dearborn, MI (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1504730
Grant/Contract Number:  
EE0006867
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Key Engineering Materials (Online)
Additional Journal Information:
Journal Volume: 742; Journal ID: ISSN 1662-9795
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 47 OTHER INSTRUMENTATION; R-curve; crack tip tracking; fracture toughness; DIC; DCB; Standards; Metrology; PMC

Citation Formats

Merzkirch, Matthias, Ahure Powell, Louise, and Foecke, Tim. Measurements of Mode I Interlaminar Properties of Carbon Fiber Reinforced Polymers Using Digital Image Correlation. United States: N. p., 2017. Web. doi:10.4028/www.scientific.net/KEM.742.652.
Merzkirch, Matthias, Ahure Powell, Louise, & Foecke, Tim. Measurements of Mode I Interlaminar Properties of Carbon Fiber Reinforced Polymers Using Digital Image Correlation. United States. doi:10.4028/www.scientific.net/KEM.742.652.
Merzkirch, Matthias, Ahure Powell, Louise, and Foecke, Tim. Mon . "Measurements of Mode I Interlaminar Properties of Carbon Fiber Reinforced Polymers Using Digital Image Correlation". United States. doi:10.4028/www.scientific.net/KEM.742.652. https://www.osti.gov/servlets/purl/1504730.
@article{osti_1504730,
title = {Measurements of Mode I Interlaminar Properties of Carbon Fiber Reinforced Polymers Using Digital Image Correlation},
author = {Merzkirch, Matthias and Ahure Powell, Louise and Foecke, Tim},
abstractNote = {Numerical models based on cohesive zones are usually used to model and simulate the mechanical behavior of laminated carbon fiber reinforced polymers (CFRP) in automotive and aerospace applications and require different interlaminar properties. Here, the current work focuses on determining the interlaminar fracture toughness (GIC) under Mode I loading of a double cantilever beam (DCB) specimen of unidirectional CFRP, serving as prototypical material. The novelty of this investigation is the improvement of the testing methodology by introducing digital image correlation (DIC) as an extensometer and this tool allows for crack growth measurement, phenomenological visualization and quantification of various material responses to Mode I loading. Multiple methodologies from different international standards and other common techniques are compared for the determination of the evolution of GICas crack resistance curves (R-curves). The primarily metrological sources of uncertainty, in contrast to material specific related uncertainties, are discussed through a simple sensitivity analysis. Additionally, the current work offers a detailed insight into the constraints and assumptions to allow exploration of different methods for the determination of material properties using the DIC measured data. Lastly, the main aim is an improvement of the measurement technique and an increase in the reliability of measured data during static testing, in advance of future rate dependent testing for crashworthiness simulations.},
doi = {10.4028/www.scientific.net/KEM.742.652},
journal = {Key Engineering Materials (Online)},
issn = {1662-9795},
number = ,
volume = 742,
place = {United States},
year = {2017},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: DIC monitoring for a) extensometer (horizontally cropped image), magnification ≈ 58 px/mm, pixel size ≈ 17 μm, subset size (controls the area of the image that is used to track the displacement between images) = 29 px, step size = 7 px b) crack growth (vertically cropped image),more » magnification ≈ 76 px/mm, pixel size ≈ 13 μm, subset size = 21 px, step size = 5 px.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.