Temperature field due to a moving heat source in machining orthotropic composites with arbitrary fiber orientation

Mehnen, Jan; Hintze, Wolfgang; Köttner, Lars; Wenserski, Robert von

doi:10.1016/j.procir.2019.09.019

Cited by 3 publications

(2 citation statements)

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“…As shown in Figure 7 , the tool temperature magnitude is consistent with that of the correspondent processed sample. This proves again that the stratification configuration of the composite material is a primary factor that determines the amount of thermal energy released during the machining process [ 44 ]. Indeed, all the measurement plotting presented above shows that silica sand grains play a remarkable role as a filler in reducing the temperature magnitude of both workpiece and tool.…”

Section: Resultsmentioning

confidence: 90%

“…Despite the presence of random fluted zones caused by silica sand grain displacement, the cut area seems to be more consolidated. This improvement in mechanical properties is attributed to the increase of the Tg of filled samples since many publications [ 43 , 44 , 45 ] have affirmed that adding filler to the epoxy matrix can improve the thermal properties of composites, especially the glass transition temperature. Indeed, temperature drop obtained when adding silica sand fillers into 90° composite material laminates indicates the significant role of the filler grain in the heat generation mechanism.…”

Section: Resultsmentioning

confidence: 99%

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Thermal Aspects in Edge Trimming of Bio-Filled GFRP: Influence of Fiber Orientation and Silica Sand Filler in Heat Generation

et al. 2022

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The present work aims to determine the influence of Glass Fiber-Reinforced Polymer (GFRP) laminating configuration in heat generation during the dry edge trimming process. Temperature measurement experiments were conducted on pure epoxy matrix, 15% unidirectional glass fiber reinforced epoxy, and 28% silica sand-filled GFRP specimens through eight type-K thermocouples evenly distributed along the trim plans and connected to a data acquisition system. Infrared thermographic measurements were also conducted to investigate the tool temperature evolution while processing. It was found that perpendicular fiber edge milling induces a sharp increase with peak temperature measurements reaching 119 °C, while machining parallel to fiber leads to a maximum temperature history of 41 °C, which is very close to that obtained from the pure epoxy test. It was also found that the addition of silica sand grains in the GFRP matrix reduces both tool and specimen temperature magnitudes up to 67% for 90° plies and 14% for 0° plies compared to silica sand-free composite initial values. The heat partition was calculated from the measured (electric) and estimated energies for the tool, the workpiece, and chips, respectively. It appears from predictions that the addition of silica sand grains increases the heat conductivity of the GFRP materials (with rates of 20% for 0° fiber orientation and 10% for 90° fiber direction), while it reduces that conducted to the milling tool. Scanning Electron Microscopy (SEM) inspections helped detect the dominating machining defects relative to each GFRP configuration and explained the heat generation and dissipation effects in light of peak temperature measurements.

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Section: Resultsmentioning

confidence: 90%