Strain rate dependent thermo-mechanical aspects of glass fiber reinforced thermoplastic based on experimental data

Lienhard, Jörg; Huberth, F.

doi:10.1016/j.ijimpeng.2019.04.023

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…The negative strain rate dependence of strength of the 3D printed material also could be founded in the local crystallinity in fibre surrounding. Multiple microcracking (compare Lienhard et al, 2019 [ 3 ] ) due to the short‐time inhibited viscosity in a dense packing of spherulite could be a possible explanation but has to be proved.…”

Section: Discussionmentioning

confidence: 99%

“…The transformation of the propulsion systems and increasing costs of materials lead to a need to reduce masses or change concepts of parts completely. Lienhard et al [1][2][3] intensively investigated crash relevant properties of injection-moulded glass fibre-reinforced polypropylene and its modelling in finite element simulations. Strong strain rate-dependent properties were found; their microstructural origins were analysed and material models developed.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural characterisation of 3D printed and injection‐moulded glass fibre‐reinforced polypropylene by image analysis, simulation and experimental methods

Lienhard,

Barisin,

Grimm‐Strele

et al. 2023

Strain

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The mechanical properties of fibre‐reinforced thermoplastics and their dependencies on the manufacturing process, fibre properties, fibre concentration and strain rate have been researched intensively for years in order to predict their macroscopic behaviour by numerical simulations as precisely as possible. Including the microstructure in both real and virtual experiments has improved prediction precision for injection‐moulded glass fibre‐reinforced thermoplastics significantly. In this work, we apply three established methods for characterisation and modelling to an injection‐moulded and to a 3D printed material. The geometric properties of the fibre component as fibre orientation, fibre length and fibre diameter distributions are identified by analysing reconstructed tomographic images. For comparing the fibre lengths, a recently suggested new method is applied. Based on segmentations of the tomographic images, we calculate the elastic stiffness of both composites numerically on the microscale. Finally, the mechanical behaviour of both materials is experimentally characterised by micro tensile tests. The simulation results agree well with the measured stiffness in case of the injection‐moulded material. However, for the 3D printed material, measurement and simulation differ strongly. The prediction from the simulation agrees with the values expected from the image analytic findings on the microstructure. Therefore, the differences in the measured behaviour have to be contributed to the matrix material. This proves demand for further research for 3D printed materials for predictable prototypes, preproduction series and possible serial application.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural characterisation of 3D printed and injection‐moulded glass fibre‐reinforced polypropylene by image analysis, simulation and experimental methods

Lienhard,

Barisin,

Grimm‐Strele

et al. 2023

Strain

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“…The purpose of this work is to design a novel prototype to measure transition temperatures with high precision and low cost. This prototype is made with commercial load cells (strain gauges) [7,8] in combination with an Arduino® microcontroller. The sensor module is a platform based on open-source software and hardware, widely used by developers due to its high flexibility for measurement and control projects [9] .…”

Section: Introductionmentioning

confidence: 99%

Low-cost and novel Arduino®-Load cell-based prototype to determine transition temperatures

Rodríguez-Pacheco,

Paraguay-Delgado,

Castañeda-Balderas

et al. 2024

Polímeros

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The polymer transition temperature is a crucial parameter in the industry for knowing raw materials before starting the manufacturing process. The current work reports a novel low-cost prototype instrument to measure the transition temperature with reliable accuracy. The equipment was built using commercial load cells composed of strain gauges in combination with an Arduino® microcontroller. The prototype measurement quality was validated by measuring the transition temperatures of most commercial polymers. The obtained values were compared with values obtained by conventional thermal analysis known as differential scanning calorimetric and thermo-mechanical analysis (DSC and TMA), which results in identical values.

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“…According to documentation, digital image correlation (DIC) was successfully employed to determine the thermal deformations in many applications [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. The DIC technique also was used for strain measurement on PCBs [ 20 , 21 , 22 ] and other composite materials [ 23 , 24 , 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Strains Produced by Thermal Expansion in Printed Circuit Boards

et al. 2022

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The paper proposed an alternative optical metrology to classical methods (strain gauge measurements and numerical simulation) for strain determination on printed circuit board (PCBs) due to thermal loads. The digital image correlation (DIC) technique was employed to record the strain distribution in some particular areas of the PCB. A thermal load was applied using a heating chamber, and the measurements were performed at four different temperature steps (25 °C, 50 °C, 85 °C and 120 °C). An increase in the principal strains with temperature was observed. For validation, the principal strains on the PCB obtained with DIC were compared with the values from gauge strain measurements and numerical simulation. The conclusions highlighted that DIC represents a technique with potential for strain measurement caused by thermal deformation, with the advantages of full field measurement, less preparation of the surface and good accuracy.

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Strain rate dependent thermo-mechanical aspects of glass fiber reinforced thermoplastic based on experimental data

Cited by 7 publications

References 21 publications

Microstructural characterisation of 3D printed and injection‐moulded glass fibre‐reinforced polypropylene by image analysis, simulation and experimental methods

Microstructural characterisation of 3D printed and injection‐moulded glass fibre‐reinforced polypropylene by image analysis, simulation and experimental methods

Low-cost and novel Arduino®-Load cell-based prototype to determine transition temperatures

Assessment of Strains Produced by Thermal Expansion in Printed Circuit Boards

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