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

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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“…Recently, a hybrid multi-scale approach to derive the local SN curves was developed by Jain et al [13][14][15].…”

Section: *Manuscript Click Here To View Linked Referencesmentioning

confidence: 99%

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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“…During the test, when the crack size at the weld toe is large enough causing the load not to go up, automatically unload and stop vibration, then record the cycle times. The cyclic stress ratio used in the test is R=0.1, and the designated cycle life is 1×10 7 . Ten 5A06+5A06 and ten 5A06+5083 T-joints specimens are used in the three-point bending fatigue test.…”

Section: Three-point Bending Fatigue Test Of T-jointmentioning

confidence: 99%

“…Where Mean 7 and Mean 8 corresponds to the 5A06+5083 and the 5A06+5A06 T-joints respectively. Goodness-offit statistics of Mean 7 and Mean 8 are shown in Tab. 11.…”

Section: S-n Curves Cluster Based On Fatigue Characteristic Domainmentioning

confidence: 99%

“…The application of the master S-N curve approach for fatigue analysis of breathing webs through FE simulation of multiple plate girders is illustrated and the effect of initial out-of-plane displacement as an important geometrical parameter in the girders' fatigue behavior is investigated by Mojgan [6]. A simplified version of master S-N curve method, which needs even less experimental input, using an assumption of constant S-N curve slope is presented by Atul [7]. Dong etc.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue life prediction of 5083 and 5A06 aluminum alloy T-welded joints based on the fatigue characteristics domain

Zou

Yang

Tan

et al. 2018

Frattura Ed Integrità Strutturale

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ABSTRACT. Three-point bending fatigue test of 5083 and 5A06 aluminum alloy T-welded joints is carried out, and the fatigue life of the specimens with different influencing factors are obtained. Finite element model of the Twelded joint is established and the nodal force based structural stress is calculated. Neighborhood rough set theory is used for analysis of the factors which influence the fatigue life of the aluminum alloy welded joints. Key influencing factors are studied and the fatigue characteristic domains are determined. The master S-N curve characterized by the nodal force based structural stress range and cycles to failure on bi-logarithmic coordinate as well as S-N curves corresponding to the fatigue characteristic domain are fitted. A case study of fatigue life prediction of 5A06 aluminum alloy welded joint indicates the effectiveness of the fatigue life prediction method based on the fatigue characteristic domain.

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“…-are also key options within this process. For short-fibre reinforced components, see [5] as an example.…”

Section: Fatigue Behaviour In Three Stagesmentioning

confidence: 99%

Modelling of Continuous Damage in Composite Structural Components

Hack

2017

Lightweight des worldw

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

Cited by 30 publications

References 37 publications

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

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

Fatigue life prediction of 5083 and 5A06 aluminum alloy T-welded joints based on the fatigue characteristics domain

Modelling of Continuous Damage in Composite Structural Components

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