Accession Number:

ADA609350

Title:

Fatigue Assessment of Underwater CFRP-Repaired Steel Panels using Finite Element Analysis

Descriptive Note:

Final rept.

Corporate Author:

ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS INFORMATION TECHNOLOGY LAB

Report Date:

2014-09-01

Pagination or Media Count:

63.0

Abstract:

The Nations Steel Hydraulic Structures SHS are suffering from significant deterioration due to various effects including corrosion, fatigue cracking, impact, and overloads. Current conventional methods used for the repair of steel bridges are accepted as the state-ofpractice for the repair of SHS. However, the application of such methods to SHS has often proven to be ineffective as a result of the excessive deterioration present in the structures. The bridge-based crack repair methods were developed primarily for mitigating cracks under Mode I loading, while SHS often experience mix-mode cracking. Therefore, the need for developing repair methodologies that are pertinent to SHS is not just necessary but essential. This report presents the numerical model constructed using a Coupled Eulerian-Lagrangian CEL analysis to calculate the stress intensity factors for different repair configurations. The methodology developed to extract the stress intensity factors from an explicit numerical model is also discussed. The model was successful in predicting the experimental results of water hitting a metal plate conducted by Ramsden 1996. Results show that CFRP-repaired plates show significant improvement over non-repaired plates and double-sided prestressed CFRP repairs exhibited the best performance, showing improvements of 5 times or greater compared to unrepaired models, and 2.5 to 3 times better results than single-prestressed and single-sided CFRP repairs.

Subject Categories:

  • Laminates and Composite Materials
  • Numerical Mathematics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE