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Title: Safety envelope for load tolerance of structural element design based on multi-stage testing

Structural elements, such as stiffened panels and lap joints, are basic components of aircraft structures. For aircraft structural design, designers select predesigned elements satisfying the design load requirement based on their load-carrying capabilities. Therefore, estimation of safety envelope of structural elements for load tolerances would be a good investment for design purpose. In this article, a method of estimating safety envelope is presented using probabilistic classification, which can estimate a specific level of failure probability under both aleatory and epistemic uncertainties. An important contribution of this article is that the calculation uncertainty is reflected in building a safety envelope using Gaussian process, and the effect of element test data on reducing the calculation uncertainty is incorporated by updating the Gaussian process model with the element test data. It is shown that even one element test can significantly reduce the calculation uncertainty due to lacking knowledge of actual physics, so that conservativeness in a safety envelope is significantly reduced. The proposed approach was demonstrated with a cantilever beam example, which represents a structural element. The example shows that calculation uncertainty provides about 93% conservativeness against the uncertainty due to a few element tests. As a result, it is shown that evenmore » a single element test can increase the load tolerance modeled with the safety envelope by 20%.« less
Authors:
 [1] ;  [1]
  1. Univ. of Florida, Gainesville, FL (United States)
Publication Date:
Grant/Contract Number:
NA0002378
Type:
Accepted Manuscript
Journal Name:
Advances in Mechanical Engineering
Additional Journal Information:
Journal Volume: 8; Journal Issue: 9; Journal ID: ISSN 1687-8140
Publisher:
SAGE
Research Org:
Univ. of Florida, Gainesville, FL (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; reliability analysis; load capacity; design; structures; testing
OSTI Identifier:
1435460

Park, Chanyoung, and Kim, Nam H. Safety envelope for load tolerance of structural element design based on multi-stage testing. United States: N. p., Web. doi:10.1177/1687814016668140.
Park, Chanyoung, & Kim, Nam H. Safety envelope for load tolerance of structural element design based on multi-stage testing. United States. doi:10.1177/1687814016668140.
Park, Chanyoung, and Kim, Nam H. 2016. "Safety envelope for load tolerance of structural element design based on multi-stage testing". United States. doi:10.1177/1687814016668140. https://www.osti.gov/servlets/purl/1435460.
@article{osti_1435460,
title = {Safety envelope for load tolerance of structural element design based on multi-stage testing},
author = {Park, Chanyoung and Kim, Nam H.},
abstractNote = {Structural elements, such as stiffened panels and lap joints, are basic components of aircraft structures. For aircraft structural design, designers select predesigned elements satisfying the design load requirement based on their load-carrying capabilities. Therefore, estimation of safety envelope of structural elements for load tolerances would be a good investment for design purpose. In this article, a method of estimating safety envelope is presented using probabilistic classification, which can estimate a specific level of failure probability under both aleatory and epistemic uncertainties. An important contribution of this article is that the calculation uncertainty is reflected in building a safety envelope using Gaussian process, and the effect of element test data on reducing the calculation uncertainty is incorporated by updating the Gaussian process model with the element test data. It is shown that even one element test can significantly reduce the calculation uncertainty due to lacking knowledge of actual physics, so that conservativeness in a safety envelope is significantly reduced. The proposed approach was demonstrated with a cantilever beam example, which represents a structural element. The example shows that calculation uncertainty provides about 93% conservativeness against the uncertainty due to a few element tests. As a result, it is shown that even a single element test can increase the load tolerance modeled with the safety envelope by 20%.},
doi = {10.1177/1687814016668140},
journal = {Advances in Mechanical Engineering},
number = 9,
volume = 8,
place = {United States},
year = {2016},
month = {9}
}