Submerged Fatigue Testing of Marine Energy Advanced Materials: Preprint

Ariel Lusty, Paul Murdy, Julia Gionet-Gonzales

Research output: Contribution to conferencePaper


Marine energy structures are typically made of advanced composite materials and are subjected to extreme ocean environments in service. In extreme ocean environments, seawater currents and waves load structures repeatedly, which cause two environmental conditions: water intrusion and mechanical fatigue. In prior research, the two environmental conditions were applied sequentially, where composite specimens were aged and then mechanically tested. To understand the combined effects of dynamic loading and water intrusion on composite materials, the present study involves the static and fatigue four-point bend testing of composite coupons in a water tank. The water tank was designed and built to fit either a 100 kN or a 250 kN load frame. Flexural strength value, cycles to failure, and failure mode results from submerged fatigue testing will be used to inform marine energy structure designs. The coupon-scale test method will be used to scale up to and inform methods for subsequent subcomponent testing and standards development. The benefits of designing marine energy structures to informed standards are decreased lifetime costs and increased reliability and energy production, ultimately leading to a sustainable and low-carbon energy system.
Original languageAmerican English
Number of pages18
StatePublished - 2024
EventSAMPE Conference and Exhibition - Long Beach, CA
Duration: 20 May 202423 May 2024


ConferenceSAMPE Conference and Exhibition
CityLong Beach, CA

NREL Publication Number

  • NREL/CP-5700-88537


  • composite materials
  • fatigue testing
  • marine energy materials


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