Design with Composites: Material Uncertainty in Designing Composites Component

• Type: Chapter or Part of a Book
• Date: 2011

Authors

Carlos Alberto Conceição António (Author) FEUP

Book

Title: Wiley Encyclopedia of Composites

ISBN: 9781118097298

Publisher: John Wiley & Sons

Indexing

ISI Web of Knowledge

Scientific classification

FOS: Engineering and technology

CORDIS: Technological sciences

Other information

Authenticus ID: P-00G-XRG

DOI: 10.1002/9781118097298.weoc068

Abstract (EN): The propagation of material uncertainty of the structural response of composites using two different approaches: a first-order local method and a global sensitivity analysis supported by a variance-based method, is studied. The importance measures of input parameters on the structural response based on numerical results are established and discussed as functions of the anisotropy of composite materials. The effects of uncertainty propagation on the response of composite structures under nonlinear geometric behavior are analyzed, especially the effects of uncertainty of material properties on the response of stiffened shell composite structures supporting buckling loads. The reliability assessment of composite structures is presented, and difficulties of structural reliability definition are identified. The most probable failure point (MPP) search in composite structures introduces new uncertainty factors associated with multiple failure points influencing the structural reliability system. The reliability index is very sensitive to the uncertainty in mean values of the mechanical properties of composites. The analyzed case studies demonstrate that knowledge of uncertainty propagation and reliability analysis are two important challenges toward more realistic modeling of failure in the design of composites.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12