Numerical fatigue analysis of CFRP components

Koch, Ilja; Zscheyge, M.; Tittmann, K.; Gude, Μaik

doi:10.1016/j.compstruct.2017.02.050

Cited by 25 publications

(20 citation statements)

References 17 publications

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“…The fatigue material subroutine outlined above is therefore impossible. The problem was avoided in the presented work by using a cycle jump method, similar to that explored by Harper and Koch [16,23]. To account for mechanical fatigue in the cohesive surface definition, the contact properties were reduced.…”

Section: Overviewmentioning

confidence: 99%

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Progressive Fatigue Failure Analysis of a Filament Wound Ring Specimen with a Hole

2021

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A progressive FEA mechanical fatigue degradation model for composites was developed and implemented using a UMAT user material subroutine in Abaqus. Numerical results were compared to experimental strain field data from high frequency digital image correlation (DIC) of split disk fatigue testing of pressure vessel cut outs with holes. The model correctly predicted the onset and evolution of damage in the matrix as well as the onset of fiber failure. The model uses progressive failure analysis based on the maximum strain failure criterion, the cycle jump method, and Miner’s sum damage accumulation rule. A parameter study on matrix properties was needed to capture the scatter in strain fields observed experimentally by DIC. S-N curve for the matrix material had to be lowered by 0% to 60% to capture the experimental scatter. The onset of local fiber failure had to be described by local S-N curves measured by DIC having 2.5 times greater strain than that of S-N curves found from standard coupon testing.

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Section: Overviewmentioning

confidence: 99%

“…The models are only tested on simple lab coupon specimen and lack experimental comparisons with local strain fields. Recent developments have expanded a modified smearing approach into mechanical fatigue, most notably by Koch et al [23]. This takes progressive fatigue damage into account.…”

Section: Introductionmentioning

confidence: 99%

Progressive Fatigue Failure Analysis of a Filament Wound Ring Specimen with a Hole

2021

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“…A current challenge is the accurate and computationally efficient prediction of the fatigue life for arbitrary multiaxial fatigue loads with different stress ratios. Extensive efforts have been made previously to develop different models for the lifetime predictionmostly for constant amplitude loading [1,2]. However, for arbitrary fatigue loading with variable amplitudes and multiaxial stress states comprising significant out-ofplane stresses, typical for hybrid FRP-metal structures in automotive industry, there are still significant challenges to be tackled.…”

Section: Introductionmentioning

confidence: 99%

Validation of An Energy-Based Fatigue Life Model for Fibre Reinforced Plastics Under Different Stress Ratios

Tittmann¹,

Koch²,

Gude³

2021

14th WCCM-ECCOMAS Congress

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The energy-based fatigue model presented in this work overcomes different shortcomings of existing model approaches, such as the need of separated assumptions for constant life diagrams. By using the range of the normalised strain energy density and a probabilistic based mode interaction approach, a failure mode dependent fatigue model for CFRP is established for directly predicting constant life diagrams and calculating the fatigue life for multiaxial loads with constant amplitude. In this contribution, the ply-based model and some of its main features, such as the consideration of residual stresses or of mode interactions at general threedimensional stress states, are shortly summarised. The stepwise model validation on different literature datasets is considered in more detail, including prediction of SN-curves with scatter band and constant life diagrams.

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“…Carbon fiber reinforced polymer (CFRP) laminate has been increasingly applied in light of its outstanding performance and superior damage tolerance. Compared with traditional materials, it has many typical advantages, such as high specific strength and stiffness, [ 1–3 ] improved impact and fatigue resistance, [ 4–6 ] perfect corrosion resistance and moisture‐proof ability, [ 7 ] and so forth. During the application, in addition to the complicated loading conditions, the unavoidable notches for mechanical connections also pose a risk to the load‐bearing capacity and service life.…”

Section: Introductionmentioning

confidence: 99%

Mechanical response and critical failure mechanism characterization of notched carbon fiber reinforced polymer laminate subjected to tensile loading

Wang

et al. 2020

Polymer Composites

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The purpose of this article is to investigate the mechanical responses and critical failure mechanisms of notched composite laminates with the aid of numerical and experimental approaches, considering the effect of notch geometry, notch size and off-axis angle. Quasi-static tensile tests are implemented to study the influence of design variables on the mechanical response, during which the relationship of force vs displacement and strain distributions are collected by means of digital image correlation technique. Subsequently, the numerical simulation is implemented in ABAQUS/Explicit through a progressive damage model integrated with a VUMAT subroutine. Meanwhile, the initiation and propagation of damage are explored through the damage morphologies, combining with the logarithmic strain components from numerical predictions. Results show that notch strength and failure strain are more closely associated with off-axis angle and notch size compared with notch geometry. In addition, with the increase of off-axis angle, the contribution of fiber is increasingly weakened, the damage mode gradually varies from fiber fracture to pull out accompanied with the damage near the notch changing from fiber fracture to delamination. Meanwhile, the critical failure mechanism varies from tension dominated to tension-shear/ shear dominated as the off-axis angle grows larger. K E Y W O R D S composite laminates, digital image correlation, failure mechanism, notch strength 1 | INTRODUCTION Carbon fiber reinforced polymer (CFRP) laminate has been increasingly applied in light of its outstanding performance and superior damage tolerance. Compared with traditional materials, it has many typical advantages, such as high specific strength and stiffness, [1-3] improved impact and fatigue resistance, [4-6] perfect corrosion resistance and moistureproof ability, [7] and so forth. During the application, in addition to the complicated loading conditions, the unavoidable notches for mechanical connections also pose a risk to the load-bearing capacity and service life. In addition, notch geometry and notch size are usually diversified to facilitate the connection of structural components, which significantly diminishes the mechanical properties and further complicates the exploration of mechanical behaviors. Furthermore, due to the anisotropy, brittleness, heterogeneity, and obvious difference between the interlaminar and intralaminar property, damage patterns, and failure mechanisms of composites also present complexity and diversity. [8]

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Numerical fatigue analysis of CFRP components

Cited by 25 publications

References 17 publications

Progressive Fatigue Failure Analysis of a Filament Wound Ring Specimen with a Hole

Progressive Fatigue Failure Analysis of a Filament Wound Ring Specimen with a Hole

Validation of An Energy-Based Fatigue Life Model for Fibre Reinforced Plastics Under Different Stress Ratios

Mechanical response and critical failure mechanism characterization of notched carbon fiber reinforced polymer laminate subjected to tensile loading

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