Fatigue damage mechanisms in short fiber reinforced PBT+PET GF30

Klimkeit, B.; Castagnet, Sylvie; Nadot, Y.; Habib, A. El; Guiffard, Benoît; Bergamo, Sébastien; Dumas, Christian; Achard, S.

doi:10.1016/j.msea.2010.10.081

Cited by 48 publications

(38 citation statements)

References 19 publications

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“…This microstructure was only noticed through the thickness of the material and no microstructure heterogeneity was found through the width and length of the rectangular plate. This type of formation has been frequently observed in a thin plate structure of thermoplastic composites manufactured by injection molding process [28][29][30].…”

Section: Pa66/gf30 and Process Induced Microstructure Descriptionmentioning

confidence: 58%

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

Arif

Meraghni

Chemisky

et al. 2014

Composites Part B: Engineering

126

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. b s t r a c tDamage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (lCT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber-matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber-matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, matrix microcracks appear and grow regardless the RH contents. For RH = 100%, these microcracks are also accompanied by many matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.

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Section: Pa66/gf30 and Process Induced Microstructure Descriptionmentioning

confidence: 58%

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

Arif

Meraghni

Chemisky

et al. 2014

Composites Part B: Engineering

126

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“…Based on a qualitative observation, De Monte et al [2] remarked that the loss of stiffness depended on the applied load and fiber length distribution but was independent of the orientation of the coupons, but an statistical proof of the same was not provided. Klimkeit et al [9] observed greater loss of stiffness in the coupons with fibers in the loading direction as opposed to coupons with fiber in the transverse to loading direction. It is hard to make qualitative judgements about loss of stiffness curves since like all fatigue based quantities there is some inherent scatter and uncertainty.…”

Section: Introductionmentioning

confidence: 98%

“…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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“…Fibers that stick out from the matrix aren't the last of the matrix and is possible when we are using different types of fibres. On microstructure we can see cracks of matrix and cracks of fibres [7,9,10] Degradation of sample PBT 30% is different than samples with 10% and 20% glass fibres. The reason for this fact is that in PBT 30% we have a greater amount of fibres in the structure.…”

Section: Microstructural Observationmentioning

confidence: 99%

The tensile strength test of thermoplastic materials based on poly(butylene terephtalate)

Rzepecka

Ostapiuk

2017

ITM Web Conf.

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Abstract. Thermoplastic composites go toward making an increasingly greater percentage of all manufacturing polymer composites. They have a lot of beneficial properties and their manufacturing using injecting and extrusion methods is a very easy and cheap process. Their properties significantly overtake the properties of traditional materials and it is the reason for their use. Scientists are continuously carrying out research to find new applications of composites materials in new industries, not only in the automotive or aircraft industry. When thermoplastic composites are manufactured a very important factor is the appropriate accommodation of tensile strength to their predestination. Scientists need to know the behaviour of these materials during the impact of different forces, and the factors of working in normal conditions too. The main aim of this article was macroscopic and microscopic analysis of the structure of thermoplastic composites after static tensile strength test. Materials which were analysed were thermoplastic materials which have poly(butylene terephthalate) -PBT matrix reinforced with different content glass fibres -from 10% for 30%. In addition, research showed the necessary force to receive fracture and set their distinguishing characteristic down.

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Fatigue damage mechanisms in short fiber reinforced PBT+PET GF30

Cited by 48 publications

References 19 publications

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

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

The tensile strength test of thermoplastic materials based on poly(butylene terephtalate)

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