Nonlinear Ship Loads and Ship Fatigue Reliability

Abstract

Stochastic methods are described here to predict the effects of nonlinear ship loads on fatigue accumulation in random seas. These are found to be capable of predicting the net fatigue damage over many ship response cycles, at a fraction of the cost of direct time-domain analysis. It is also shown how these nonlinear ship load models can be used within a full reliability analysis of ship components. This uses first-order reliability methods to estimate not only the net effect of all uncertainty sources, but also the relative contribution of each (e.g., load vs. material property variability). In our ship load application, nonlinear effects are found to increase the relative impact of load (and wave) modelling and its uncertainty.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1997
Accession Number
ADA396338

Entities

People

  • Alok K. Jha

Organizations

  • Stanford University

Tags

DTIC Thesaurus Topics

  • Bending Moments
  • Civil Engineering
  • Composite Materials
  • Frequency
  • Lymphocytes
  • Materials
  • Nonlinear Analysis
  • Offshore Structures
  • Probability
  • Random Variables
  • Regression Analysis
  • Ship Decks
  • Ship Models
  • Simulations
  • Statistics
  • Steady State
  • Two Dimensional

Fields of Study

  • Engineering

Readers

  • Computational Modeling and Simulation
  • Life Cycle Cost Analysis
  • Marine Hydrodynamics