An Energy-Based Limit State Function for Estimation of Structural Reliability in Shock Environments

Journal Article · Tue Jan 01 00:00:00 EST 2013 · Shock and Vibration

DOI:https://doi.org/10.1155/2013/145374· OSTI ID:1198160

Guthrie, Michael A. ^[1]

---

1. Analytical Structural Dynamics, Org. 1523, Sandia National Laboratories, MS 0346, P.O. Box 5800, Albuquerque, NM 87185, USA

limit state function is developed for the estimation of structural reliability in shock environments. This limit state function uses peak modal strain energies to characterize environmental severity and modal strain energies at failure to characterize the structural capacity. The Hasofer-Lind reliability index is briefly reviewed and its computation for the energy-based limit state function is discussed. Applications to two degree of freedom mass-spring systems and to a simple finite element model are considered. For these examples, computation of the reliability index requires little effort beyond a modal analysis, but still accounts for relevant uncertainties in both the structure and environment. For both examples, the reliability index is observed to agree well with the results of Monte Carlo analysis. In situations where fast, qualitative comparison of several candidate designs is required, the reliability index based on the proposed limit state function provides an attractive metric which can be used to compare and control reliability.

• Sponsoring Organization: USDOE
• Grant/Contract Number: AC04-94AL85000
• OSTI ID: 1198160
• Journal Information: Shock and Vibration, Journal Name: Shock and Vibration Vol. 20 Journal Issue: 5; ISSN 1070-9622
• Publisher: Hindawi Publishing Corporation
• Country of Publication: Egypt
• Language: English