Long-term strength and damage analysis of laminated composites

Yuris Dzenis, Shiv P. Joshi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A modified version of the probabilistic model developed by the authors for damage evolution analysis of laminates subjected to random loading is utilized to predict long-term strength of laminates. The model assumes that each ply in a laminate consists of a large number of mesovolumes. Probabilistic variation functions for mesovolumes stiffnesses as well as strengths are used in the analysis. Stochastic strains are calculated using the lamination theory and random function theory. Deterioration of ply stiffnesses is calculated on the basis of the probabilities of mesovolumes failures using the theory of excursions of random process beyond the limits. Long-term strength and damage accumulation in a Kevlar®/epoxy laminate under tension and complex in-plane loading are investigated. Effects of the mean level and stochastic deviation of loading on damage evolution and time to failure are discussed. It is found that the effect of the deviation in loading is more pronounced at lower mean loading levels. Long-term cumulative damage at the time of the final failure at low loading levels is higher than at high loading levels. The analytical results are qualitatively compared with the available experimental observations.

Original languageEnglish (US)
Pages (from-to)1057-1063
Number of pages7
JournalAIAA Journal
Volume35
Issue number6
StatePublished - Jun 1 1997

Fingerprint

Laminated composites
Laminates
Stiffness
Random processes
Deterioration

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Long-term strength and damage analysis of laminated composites. / Dzenis, Yuris; Joshi, Shiv P.

In: AIAA Journal, Vol. 35, No. 6, 01.06.1997, p. 1057-1063.

Research output: Contribution to journalArticle

Dzenis, Yuris ; Joshi, Shiv P. / Long-term strength and damage analysis of laminated composites. In: AIAA Journal. 1997 ; Vol. 35, No. 6. pp. 1057-1063.
@article{7eb03cf4ef4a411baf45027e1a130f5f,
title = "Long-term strength and damage analysis of laminated composites",
abstract = "A modified version of the probabilistic model developed by the authors for damage evolution analysis of laminates subjected to random loading is utilized to predict long-term strength of laminates. The model assumes that each ply in a laminate consists of a large number of mesovolumes. Probabilistic variation functions for mesovolumes stiffnesses as well as strengths are used in the analysis. Stochastic strains are calculated using the lamination theory and random function theory. Deterioration of ply stiffnesses is calculated on the basis of the probabilities of mesovolumes failures using the theory of excursions of random process beyond the limits. Long-term strength and damage accumulation in a Kevlar{\circledR}/epoxy laminate under tension and complex in-plane loading are investigated. Effects of the mean level and stochastic deviation of loading on damage evolution and time to failure are discussed. It is found that the effect of the deviation in loading is more pronounced at lower mean loading levels. Long-term cumulative damage at the time of the final failure at low loading levels is higher than at high loading levels. The analytical results are qualitatively compared with the available experimental observations.",
author = "Yuris Dzenis and Joshi, {Shiv P.}",
year = "1997",
month = "6",
day = "1",
language = "English (US)",
volume = "35",
pages = "1057--1063",
journal = "AIAA Journal",
issn = "0001-1452",
publisher = "American Institute of Aeronautics and Astronautics Inc. (AIAA)",
number = "6",

}

TY - JOUR

T1 - Long-term strength and damage analysis of laminated composites

AU - Dzenis, Yuris

AU - Joshi, Shiv P.

PY - 1997/6/1

Y1 - 1997/6/1

N2 - A modified version of the probabilistic model developed by the authors for damage evolution analysis of laminates subjected to random loading is utilized to predict long-term strength of laminates. The model assumes that each ply in a laminate consists of a large number of mesovolumes. Probabilistic variation functions for mesovolumes stiffnesses as well as strengths are used in the analysis. Stochastic strains are calculated using the lamination theory and random function theory. Deterioration of ply stiffnesses is calculated on the basis of the probabilities of mesovolumes failures using the theory of excursions of random process beyond the limits. Long-term strength and damage accumulation in a Kevlar®/epoxy laminate under tension and complex in-plane loading are investigated. Effects of the mean level and stochastic deviation of loading on damage evolution and time to failure are discussed. It is found that the effect of the deviation in loading is more pronounced at lower mean loading levels. Long-term cumulative damage at the time of the final failure at low loading levels is higher than at high loading levels. The analytical results are qualitatively compared with the available experimental observations.

AB - A modified version of the probabilistic model developed by the authors for damage evolution analysis of laminates subjected to random loading is utilized to predict long-term strength of laminates. The model assumes that each ply in a laminate consists of a large number of mesovolumes. Probabilistic variation functions for mesovolumes stiffnesses as well as strengths are used in the analysis. Stochastic strains are calculated using the lamination theory and random function theory. Deterioration of ply stiffnesses is calculated on the basis of the probabilities of mesovolumes failures using the theory of excursions of random process beyond the limits. Long-term strength and damage accumulation in a Kevlar®/epoxy laminate under tension and complex in-plane loading are investigated. Effects of the mean level and stochastic deviation of loading on damage evolution and time to failure are discussed. It is found that the effect of the deviation in loading is more pronounced at lower mean loading levels. Long-term cumulative damage at the time of the final failure at low loading levels is higher than at high loading levels. The analytical results are qualitatively compared with the available experimental observations.

UR - http://www.scopus.com/inward/record.url?scp=0012927813&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0012927813&partnerID=8YFLogxK

M3 - Article

VL - 35

SP - 1057

EP - 1063

JO - AIAA Journal

JF - AIAA Journal

SN - 0001-1452

IS - 6

ER -