Fatigue life assessment in notched injection-molded specimens of a short-glass fiber reinforced Polyamide 6 with different injection gate locations

Castagnet, Sylvie; Nadot-Martin, Carole; Fouchier, Nathan; Conrado, Edoardo; Bernasconi, A.

doi:10.1016/j.ijfatigue.2020.105968

Cited by 8 publications

(3 citation statements)

References 28 publications

(41 reference statements)

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“…The FE approach described is an established methodology for SFRP, and it was already used to evaluate different fatigue criteria for SFRP unnotched 12 and notched specimens 31 …”

Section: Numerical Analysismentioning

confidence: 99%

On the use of milled shell‐only specimens to study the effect of fiber orientation on the fatigue behavior of a short fiber‐reinforced polyamide

Canegrati

Martulli

Hine

et al. 2022

Fatigue Fract Eng Mat Struct

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The interpretation of the fiber orientation effects on the fatigue behavior of short fiber-reinforced polymers using specimens extracted from injectionmolded plates is hampered by the typical shell-core-shell structure, which affects the stress distribution through the sample's thickness. In this work, local fatigue strength values are obtained using specimens machined to leave only the outer shell layers, thus having a more homogeneous fiber orientation. Results of the finite element analysis of integer and shell-only specimens, accounting for locally measured fiber orientations, are compared. Conclusions are drawn about the role of the core layer and the limitations of milled specimens in the evaluation of the fatigue strength.

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“…The FE approach described is an established methodology for SFRP, and it was already used to evaluate different fatigue criteria for SFRP unnotched 12 and notched specimens 31 …”

Section: Numerical Analysismentioning

confidence: 99%

On the use of milled shell‐only specimens to study the effect of fiber orientation on the fatigue behavior of a short fiber‐reinforced polyamide

Canegrati

Martulli

Hine

et al. 2022

Fatigue Fract Eng Mat Struct

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“…The available criteria for predicting the life to crack initiation in the presence of notches are stress-based, 23,27,29,33 strain-based 34 or strain energy density-based 35,36 approaches inherited from metal fatigue. These quantities are typically evaluated through macroscale Finite Element (FE) analyses on notched specimens where the material is treated as homogeneous.…”

Section: Introductionmentioning

confidence: 99%

Modeling the high‐cycle fatigue crack initiation in short fiber reinforced polymers with notches

Pietrogrande,

Carraro,

Zappalorto

et al. 2024

Polymer Composites

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In this work, a new approach is proposed for predicting the life to crack initiation in Short Fiber Reinforced Polymers (SFRPs) under cyclic loadings in the presence of notches, cut‐outs and stress concentrations. A multiscale model is presented, encompassing two length scales for correlating the applied loads to the local stress fields in the matrix. These are used for defining an effective stress for predicting the life to crack initiation, accounting for the simultaneous influence of the notch geometry, the fiber content, orientation and distribution. The criterion was successfully validated on a large set of experimental results.Highlights A new model is proposed for predicting fatigue crack initiation in notched SFRPs The model is based on a multiscale procedure Prediction is based on local matrix stresses averaged in a structural volume The model accounts for fiber orientation, distribution and notch geometry

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“…The principal factor that affects the mechanical properties of SFRP is the fiber orientation. There are many factors that affect the fiber orientation such as injection point position, injection speed, injection pressure, mold temperature, fiber content, part geometry, and overall thickness 1–4 . Many studies are conducted to present the effects of fiber orientation on to the mechanical response of composite materials 5–21 …”

Section: Introductionmentioning

confidence: 99%

Experimental testing of two short‐fiber reinforced composites: PPA‐GF33 and PPS‐GF40

Micota

Isaincu

Marșavina

2021

Mat Design & Process Comms

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This paper presents an experimental testing of two short‐fiber reinforced composites (SFRC). The two materials are a polyphthalamide with 33% glass fiber inclusion (PPA‐GF33) and a polyphenylene sulfide with 40% glass fiber inclusion. Rectangular plates were obtained from these two materials by injection molding. Specimens, type 1BA, according to ISO 527‐2, were cut out with orientations of 0°, 15°, 30°, 45°, 60°, and 90°, with respect to the longitudinal direction of the plate. The cutting was conducted using a CNC water jet machine. Tension tests were performed at room temperature, in order to determine the mechanical behavior. Results are presented in the form of stress–strain curves, considering different orientations of the specimens. The experimental results were processed in order to assess the differences that appear due to fiber orientation. A comparison between the two materials was performed in terms of Young's modulus, tensile strength, and tensile strain. The experimental data were used to calibrate the Tsai–Hill fracture criterion.

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Fatigue life assessment in notched injection-molded specimens of a short-glass fiber reinforced Polyamide 6 with different injection gate locations

Cited by 8 publications

References 28 publications

On the use of milled shell‐only specimens to study the effect of fiber orientation on the fatigue behavior of a short fiber‐reinforced polyamide

On the use of milled shell‐only specimens to study the effect of fiber orientation on the fatigue behavior of a short fiber‐reinforced polyamide

Modeling the high‐cycle fatigue crack initiation in short fiber reinforced polymers with notches

Experimental testing of two short‐fiber reinforced composites: PPA‐GF33 and PPS‐GF40

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