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Title: Numerical Study on the Variability of Plastic CTOD
Authors: Prates, Pedro André 
Marques, Armando Eusébio 
Borges, Micael Frias 
Branco, Ricardo Madeira 
Antunes, Fernando V. 
Keywords: CTOD; fatigue; metamodeling; sensitivity analysis; stochastic analysis; variability
Issue Date: 11-Mar-2020
Publisher: MDPI
Serial title, monograph or event: Materials
Volume: 13
Issue: 6
Abstract: This paper presents a numerical study on the influence of material parameters and loading variability in the plastic crack tip opening displacement (CTOD) results. For this purpose, AA7050-T6 was selected as reference material and a middle-cracked tension specimen geometry was considered. The studied input parameters were the Young's modulus, Poisson's ratio, isotropic and kinematic hardening parameters and the maximum and minimum applied loads. The variability of the input parameters follows a Gaussian distribution. First, screening design-of-experiments were performed to identify the most influential parameters. Two types of screening designs were considered: one-factor-at-a-time and fractional factorial designs. Three analysis criteria were adopted, based on: main effect, index of influence and analysis of variance. Afterwards, metamodels were constructed to establish relationships between the most influential parameters and the plastic crack tip opening displacement (CTOD) range, based on two types of designs: Face-Centered Central Composite Design and Box-Behnken design. Finally, the metamodels were validated, enabling the expeditious evaluation of the variability in the plastic CTOD range; in addition, the variability in the fatigue crack growth rate was also evaluated.
ISSN: 1996-1944
DOI: 10.3390/ma13061276
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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