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A combined experimental and computational analysis of failure mechanisms in open-hole cross-ply laminates under flexural loading

Journal Article · · Composites Part B: Engineering
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [4]
  1. Nanjing Univ. of Science and Technology (China). School of Intelligent Manufacturing; McMaster Univ., Hamilton, ON (Canada). Dept. of Mechanical Engineering; Shanghai Jiao Tong Univ. (China)
  2. Shanghai Jiao Tong Univ. (China). School of Naval Architecture, Ocean and Civil Engineering. Dept. of Engineering Mechanics
  3. Nanjing Univ. of Science and Technology (China). School of Intelligent Manufacturing
  4. Ford Motor Company, Dearborn, MI (United States). Dept. of Materials Manufacturing
  5. Northwestern Univ., Evanston, IL (United States). McCormick School of Engineering and Applied Science
  6. Clemson Univ., SC (United States). Dept. of Mechanical Engineering
  7. McMaster Univ., Hamilton, ON (Canada). Dept. of Mechanical Engineering

In this work, integrated experimental tests and computational modeling are proposed to investigate the failure mechanisms of open-hole cross-ply carbon fiber reinforced polymer (CFRP) laminated composites. In particular, we propose two effective methods, which include width-tapered double cantilever beam (WTDCB) and fixed-ratio mixed-mode end load split (FRMMELS) tests, to obtain the experimental data more reliably. We then calibrate the traction-separation laws of cohesive zone model (CZM) used among laminas of the composites by leveraging these two methods. The experimental results of fracture energy, i.e. GIc and GTc, obtained from WTDCB and FRMMELS tests are generally insensitive to the crack length thus requiring no effort to accurately measure the crack tip. Moreover, FRMMELS sample contains a fixed mixed-mode ratio of GIIc/GTc depending on the width taper ratio. Examining comparisons between experimental results of FRMMELS tests and failure surface of B–K failure criterion predicted from a curve fitting, good agreement between the predictions and experimental data has been found, indicating that FRMMELS tests are an effective method to determine mixed-mode fracture criterion. In addition, a coupled experimental-computational modeling of WTDCB, edge notched flexure, and FRMMELS tests are adopted to calibrate and validate the interfacial strengths. Finally, failure mechanisms of open-hole cross-ply CFRP laminates under flexural loading have been studied systematically using experimental and multi-scale computational analyses based on the developed CZM model. The initiation and propagation of delamination, the failure of laminated layers as well as load-displacement curves predicted from computational analyses are in good agreement with what we have observed experimentally.

Research Organization:
Ford Motor Company, Detroit, MI (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); China Scholarship Council (CSC); Clemson University; SC TRIMH
Grant/Contract Number:
EE0006867
OSTI ID:
1848458
Alternate ID(s):
OSTI ID: 1782362
Journal Information:
Composites Part B: Engineering, Journal Name: Composites Part B: Engineering Journal Issue: C Vol. 215; ISSN 1359-8368
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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