Multiaxial fatigue life assessment for reinforced polymers

Klimkeit, B.; Nadot, Y.; Castagnet, Sylvie; Nadot-Martin, Carole; Dumas, Christian; Bergamo, Sébastien; Sonsino, Cetin Morris; Büter, Andreas

doi:10.1016/j.ijfatigue.2010.12.004

Cited by 67 publications

(67 citation statements)

References 24 publications

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“…It is important to understand the relation between the FOD and the fatigue properties. A number of experimental results [6][7][8][9][10][11][12][13][14][15] have confirmed the dependence of the fatigue and static behavior on the FOD of the tested specimen. However, the exact relation between the fatigue properties and FOD is unknown.…”

Section: Introductionmentioning

confidence: 64%

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A feasibility study of the Master SN curve approach for short fiber reinforced composites

Jain

Paepegem

Verpoest

et al. 2016

International Journal of Fatigue

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Short fiber reinforced composite (SFRC) materials have a different fiber orientation distribution (FOD) at every point. The fatigue properties of SFRC are known to depend on the FOD.The Master SN curve (MSNC) method for predicting an SN curve for a given FOD based on the known SN curve for the reference FOD is used to predict the local SN curve of a SFRC component by relating the damage at the microscopic level to the macroscopic fatigue properties. A simplified version of MSNC method, which needs even less experimental input, uses an assumption of constant SN curve slope is also presented in this paper. The paper validates both variants of the MSNC method on three sets of experimental data on fatigue of short fiber composites and analyses their accuracy. It is demonstrated that the MSNC approach needs only one SN curve as input with no specific requirements to the fiber orientation of the test coupon. Test coupons could have either uniform fiber orientation in the thickness or a "skin core" orientation variation. Highlights: A method for generating local SN curves for short fiber composites is presented  Method is based on combination of manufacturing studies, tests and micromechanics  Slope of SN curve is found to be independent of fiber orientation distribution(FOD)  Only one SN curve is needed as input with no restriction on FOD of reference coupon

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Section: Introductionmentioning

confidence: 64%

“…Other approaches include scaling the SN curve on the basis of the fatigue crack growth parameter [8,19,22], this approach gives reasonable results. However this approach requires as input apart from one SN curve, a fatigue crack growth parameter.…”

Section: Introductionmentioning

confidence: 99%

A feasibility study of the Master SN curve approach for short fiber reinforced composites

Jain

Paepegem

Verpoest

et al. 2016

International Journal of Fatigue

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“…For example, De Monte et al who reported range of 1.14-1.23 for coupons subjected to tension-tension loading and in between 1.05-1.30 for loading at different r-ratio. By carefully extracting the published fatigue data and calculating the value of T σ in the above described way, one sees that the value of T σ for the data by Klimkeit et al [6] comes to be in the range of 1.22-1.35; while that from Mortazavian and Fatemi [4] are in the range of 1.18-1.36.…”

Section: Resultsmentioning

confidence: 99%

“…a variation of the FO over the thickness. This is clearly evident in the microscopic pictures of both papers by De Monte [5] and by Vincent [6]. I suggest thus to add a statement that experimental investigation of FO to validate the results from process simulation would be required.…”

Section: Point 2: Fiber Orientation Distribution (Pag 3 and 4)mentioning

confidence: 94%

“…Like most other polymer composite materials, SFRC are also known to suffer loss of stiffness when subjected to cyclic loading. There is a large amount of experimental evidence which confirms the loss of stiffness during cyclic loading particularly tension-tension fatigue [2,[5][6][7][8][9]. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 There is very little known about the dependence of the loss of stiffness to the FOD of SFRC material.…”

Section: Introductionmentioning

confidence: 99%

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A statistical treatment of the loss of stiffness during cyclic loading for short fiber reinforced injection molded composites

Jain

Paepegem

Verpoest

et al. 2016

Composites Part B: Engineering

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Injection molded short fiber reinforced composites (SFRC) have different local fiber orientation distribution (FOD) at every point. SN curves of short fiber reinforced composites are known to depend on the fiber orientation distribution. Such materials also suffer from continuous loss of stiffness during cyclic loading. It is not known whether the loss of stiffness is different for SFRC with different FOD. A statistical analysis of the loss of stiffness curves is presented in this paper. Tension-tension fatigue experiments are performed and loss of stiffness is collected for every data point in the SN curve. A systematic method for comparing the loss of stiffness is developed. It is concluded that the difference in loss of stiffness curves for coupons of SFRC with different FOD is not statistically significant. Dear Editor,We, hereby submit revised version of article "A statistical treatment of the loss of stiffness during cyclic loading for short fiber reinforced injection molded composites" by the authors Atul Jain, Wim Van Paepegem, Ignaas Verpoest, Stepan V. Lomov to journal Composites Part B: EngineeringIn this paper, a new method to statistically compare the loss of stiffness curves is developed and sufficiently high number of experiments are performed to compare the loss of stiffness curves of short fiber reinforced composites. It is seen that the loss of stiffness curves are independent of the fiber orientation distribution in the short fiber reinforced composites.All the comments by all the referee have been addressed and described in the "answer to reviewer document".We declare that the content is not duplicated and not submitted to any other journal We thank the Referee for his continued interest in our work and for helpful comments that will greatly improve the manuscript and we have tried to do our best to respond to the points raised. The Referee has brought up some useful points and we appreciate the opportunity to clarify our research objectives and methods.As indicated below we have checked all the comments provided by the Referees and have made necessary changes accordingly to their indications. At the end of reply, wherever possible, we have indicated in bold the page number in text where change has been made.New text in the paper has been typed in red. Point 1: Influence of specimen extraction position (pag. 4)Profiles of the orientation tensor components over the thickness form process simulation are reported. An indication of the positions chosen for the plots of Fig.3a and Fig. 3b would be helpful for the reader. However, experimental evidence of FOD over the thickness is missing. Further, the influence of extraction position on mechanical properties is still not directly addressed. In view of this facts, it should be stated in the paper that "the FOD is uniform over the plate" is actually an assumption (supported by simulation) and that "extraction of specimens from different positions on the plate is a possible source of the scatter of quasistatic as well as fatigue strength". ...

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Experimental Observations of Fatigue of Short Fiber Reinforced Composites

2017

Fatigue of Textile and Short Fiber Reinforced Composites

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Multiaxial fatigue life assessment for reinforced polymers

Cited by 67 publications

References 24 publications

A feasibility study of the Master SN curve approach for short fiber reinforced composites

A feasibility study of the Master SN curve approach for short fiber reinforced composites

A statistical treatment of the loss of stiffness during cyclic loading for short fiber reinforced injection molded composites

Experimental Observations of Fatigue of Short Fiber Reinforced Composites

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