Effect of mean stress on the stress-controlled fatigue of a short E-glass fiber reinforced polyamide-6,6

Mallick, P. K.; Zhou, Yuanxin

doi:10.1016/j.ijfatigue.2004.02.003

Cited by 107 publications

(57 citation statements)

References 6 publications

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“…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%

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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Section: Introductionmentioning

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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“…Fatigue life of a polymeric composite is also affected by a number of test parameters. These include: stress or strain amplitude of the loading cycle; mean stress of the cycle; frequency, temperature and environment of the test [6,[13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Accelerated Fatigue Testing of Biodegradable Composites with Flax Fibers

2015

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The objective of the study was to analyze and compare fatigue properties of composites based on two biodegradable polymers: thermoplastic starch and polylactide blend filled with 10 wt% short flax fibers. Accelerated fatigue tests with increasing amplitude were done on neat polymers and their composites. Dissipated energy, strain and the temperature on the sample surface were the three characteristic values measured or calculated during the tests to evaluate fatigue stress of the materials with the use of Lehr's method. The increase in temperature was not observed. Addition of flax fibers resulted in improvement of fatigue strength of polylactide-based composite but thermoplastic starch filled with flax fibers showed lower fatigue strength than neat polymer, shortened fatigue life and higher susceptibility to cyclic creep.

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“…It is well documented that for a given maximum stress in a tension-tension case, the fatigue life of the composite increases with increasing magnitude of R. In compression-compression loading, increasing the magnitude of R reduces the fatigue life of the examined composite [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, this type of loading cannot be considered as fatigue loading, but rather as creep of the material (constant static load over a short or long period), see e.g. [5,7]. Although modifications to take the time-dependent material strength into account have been introduced, their integration into CLD formulations requires the adoption of additional assumptions, see e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Although modifications to take the time-dependent material strength into account have been introduced, their integration into CLD formulations requires the adoption of additional assumptions, see e.g. [5,18], and yet none of these modifications can provide a general model to characterize the fatigue-creep interaction in composite materials.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental investigation and modeling of mean load effect on fatigue behavior of adhesively-bonded pultruded GFRP joints

Sarfaraz

Vassilopoulos

Keller

2012

International Journal of Fatigue

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Effect of mean stress on the stress-controlled fatigue of a short E-glass fiber reinforced polyamide-6,6

Cited by 107 publications

References 6 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

Accelerated Fatigue Testing of Biodegradable Composites with Flax Fibers

Experimental investigation and modeling of mean load effect on fatigue behavior of adhesively-bonded pultruded GFRP joints

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