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Title: Development of a Vibration Technique Based on Geometric Optimization for Fatigue Life Evaluation of Sandwich Composite Structures

Journal Article · · Applied Sciences
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [2];  [3]
  1. Univ. of Puerto Rico, Mayaguez (Puerto Rico)
  2. Polytechnic Univ. of Puerto Rico, Orlando, FL (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States); Institute for Advanced Composites Manufacturing Innovation (IACMI), Knoxville, TN (United States)

A major obstacle to obtaining cost-effective experimental data on the fatigue life of sandwich panels is the prohibitive amount of time and cost required to carry out millions of cycles. On the other hand, vibration techniques applied to sandwich geometries fail to match the stress patterns that are obtained from standard flexural fatigue tests. To overcome such limitations, a vibration-based fatigue technique is proposed, which entails the use of sandwich specimens whose geometries are optimized to reproduce the stress distribution observed during three point bend loading while vibrating at the first resonant frequency. The proposed vibration technique was experimentally validated. The results, compared with the average number of cycles to failure at different stress ratios obtained via the Three-Point Bending test, showed high levels of accuracy. The proposed method is robust and time effective and indicates the possibility of attaining fatigue lifetime prediction of a wide class of composite elements, such as sandwich panels.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Office of Naval Research (ONR); Puerto Rico Science, Technology and Research Trust (PRSTRT); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1860568
Journal Information:
Applied Sciences, Journal Name: Applied Sciences Journal Issue: 1 Vol. 12; ISSN 2076-3417
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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