Predicting Fatigue Damage of Composites Using Strength Degradation and Cumulative Damage Model

Khan, Arafat I.; Venkataraman, Satchi; Miller, Ian

doi:10.3390/jcs2010009

Cited by 23 publications

(16 citation statements)

References 33 publications

(96 reference statements)

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“…A nonlinear model could also be given based on the intensity of degradation proportional to the instantaneous intensity 5 . For the research of strength degradation model, the dimensionless load parameter definition could also be modified according to the existing empirical model 6 . The residual strength model could also be given on the basis of the strength life equivalent rank hypothesis, but the number of undetermined coefficients would be large 7 .…”

Section: Introductionmentioning

confidence: 99%

Interval dynamic reliability analysis of mechanical components under multistage load based on strength degradation

Jiang

Liu

Wang

et al. 2020

Quality & Reliability Eng

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To further study the law of strength degradation, the residual strength degradation model is established based on the definition of fatigue damage, considering the interaction of various uncertain factors and time factors in service environment. Combined with equivalent damage model, a nonlinear cumulative damage model is proposed, which takes the interaction among loading loads into account and improves the accuracy of calculation. Additionally, the equivalent transformation of multistage load is studied using interval theory. According to the interval dynamic nonprobability reliability prediction model, a dynamic reliability analysis of the interval model is carried out. Dynamic reliability of the component is analyzed under multistage load accumulation damage to verify the effectiveness of the method.

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Section: Introductionmentioning

confidence: 99%

Interval dynamic reliability analysis of mechanical components under multistage load based on strength degradation

Jiang

Liu

Wang

et al. 2020

Quality & Reliability Eng

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“…Recent advances in digital-image processing have improved its accuracy and reliability. DIC has been used to describe strain gradients surrounding circular holes in dynamic [33,34], static and fatigue loading [6,35].…”

Section: Digital-image Correlation (Dic) Methods and The Damage Variablementioning

confidence: 99%

“…A broader review of published papers in this area is presented e.g., by Shokrieh [3,4] and Muc, Romanowicz [5]. The fatigue failure and damage analysis of composites with an open hole is also discussed by Khan et al [6,7]. These papers make also clear distinctions between the empirical and continuum damage mechanics-based models for fatigue analysis.…”

Section: Introductionmentioning

confidence: 99%

Fatigue-Damage Evolution of Notched Composite Multilayered Structures under Tensile Loads

et al. 2018

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The problems discussed in the present paper are well-known both from the theoretical (numerical) and experimental point of view. The novelty of our approach depends on the application of hybrid experimental methods and a comparison of their effectiveness in the description of complicated fatigue problems arising in the analysis of the behavior of laminated panels with open holes and subjected to tensile loading. Three experimental methods were used: infrared thermography (passive), structural health monitoring (active), and digital image correlation. The experimental investigations were supplemented by the finite element description of the problem dealing mainly with the static behavior, monitoring the development and final fracture of composites. The considerations concern laminated panels oriented at ±45 • with different types of holes, i.e., vertical elliptical, horizontal elliptical, and circular.

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“…They performed experimental tests under tensile fatigue loading conditions and monitored the strains and displacements by a digital image correlation device to validate their numerical models. Khan et al in [ 41 ] also developed a user material subroutine (UMAT) based on the Shokrieh and Lessard model. They used a cumulative damage approach to assess the variation in stress amplitude, resulting from the stress state redistribution after failure.…”

Section: Introductionmentioning

confidence: 99%

A Robust Numerical Methodology for Fatigue Damage Evolution Simulation in Composites

et al. 2021

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Composite materials, like metals, are subject to fatigue effects, representing one of the main causes for component collapse in carbon fiber-reinforced polymers. Indeed, when subject to low stress cyclic loading, carbon fiber-reinforced polymers exhibit gradual degradation of the mechanical properties. The numerical simulation of this phenomenon, which can strongly reduce time and costs to market, can be extremely expensive in terms of computational effort since a very high number of static analyses need to be run to take into account the real damage propagation due the fatigue effects. In this paper, a novel cycle jump strategy, named Smart Cycle strategy, is introduced in the numerical model to avoid the simulation of every single cycle and save computational resources. This cycle jump strategy can be seen as an enhancement of the empirical model proposed by Shokrieh and Lessard for the evaluation of the fatigue-induced strength and stiffness degradation. Indeed, the Smart Cycle allows quickly obtaining a preliminary assessment of the fatigue behavior of composite structures. It is based on the hypothesis that the stress redistribution, due to the fatigue-induced gradual degradation of the material properties, can be neglected until sudden fiber and/or matrix damage is verified at element/lamina level. The numerical procedure has been implemented in the commercial finite element code ANSYS MECHANICAL, by means of Ansys Parametric Design Languages (APDL). Briefly, the Smart Cycle routine is able to predict cycles where fatigue failure criteria are likely to be satisfied and to limit the numerical simulation to these cycles where a consistent damage propagation in terms of fiber and matrix breakage is expected. The proposed numerical strategy was preliminarily validated, in the frame of this research study, on 30° fiber-oriented unidirectional coupons subjected to tensile–tensile fatigue loading conditions. The numerical results were compared with literature experimental data in terms of number of cycles at failure for different percentage of the static strength. Lastly, in order to assess its potential in terms of computational time saving on more complex structures and different loading conditions, the proposed numerical approach was used to investigate the fatigue behavior of a cross-ply open-hole composite panel under tension–tension fatigue loading conditions.

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Predicting Fatigue Damage of Composites Using Strength Degradation and Cumulative Damage Model

Cited by 23 publications

References 33 publications

Interval dynamic reliability analysis of mechanical components under multistage load based on strength degradation

Interval dynamic reliability analysis of mechanical components under multistage load based on strength degradation

Fatigue-Damage Evolution of Notched Composite Multilayered Structures under Tensile Loads

A Robust Numerical Methodology for Fatigue Damage Evolution Simulation in Composites

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