Influence of Thermal Conductivity on Stacking Sequence of Hybrid Composites

Abstract

Hybrid Composites comprising of two or more reinforcement materials are finding increase in demand in diverse field of applications such as building panels, automotive components and aero parts. There is a need to study the thermal properties to find the suitability of hybrid laminates as insulating materials. In this research article an attempt is made to find the thermal conductivity of laminate materials having varying stacking sequence of its reinforcement fibers. The said laminate is produced using hand layup method. It contain seven layers of reinforcement fibers stacked one over other in three different configurations. First the reinforcements kevlar (K49) and basalt fibers are stacked in alternating layers. Second configuration contain bilayers of kevlar or basalt sandwiching the inner three alternative layers. Third configuration contain tri layer of one of the reinforcement fibers sandwiched between bilayers of another reinforcement fibers. Epoxy resin is used as binding cum matrix element in all the hybrid laminates. The produced hybrid laminates are tested for its thermal conductivity and coefficient of thermal expansion. It is found that increasing the number of layers of basalt fibers increased the thermal conductivity of the hybrid laminate. On the other hand, kevlar fibers contributed in reducing the thermal conductivity of the hybrid laminates. Thermal expansion coefficient depended on the presence of basalt fibers as the outermost layers in the hybrid laminates. The hybrid laminates having kevlar fibers contributed in lowering thermal conductivity and also the coefficient of thermal expansion.

Thermal management using nano coated heat sink for electric vehicle battery cooling

“…It is observed that the temperature reverted to exhibit linear variation below 36°C. This is because as the temperature approaches closer to the steady state condition, the heat exchange between the heat sink and the surrounding atmosphere takes place in a reasonably controlled manner (Ramasamy et al., 2021).…”

“…After increasing the heat input to 35 W, the time taken was reduced to 240 s. It was further reduced to 145 s after increasing the input supply to 45 W. It is evident that increasing heat input increases the thermal conduction of the heat sink. This facilitated an increase in heat dissipation through the heat sink that is made of AA6061 (Ramesh & Anand, 2019).…”

“…DC power supply capable of delivering up to 80 W was used to power the nichrome coils. The thermal paste made of epoxy (LY556) and hardener (HY951) mixed in a ratio of 10:1 was used (Ramesh & Anand, 2019). The thermal paste prevents electrical contact with the heat sink, enables heat transfer with the heat sink, and prevents surface irregularities due to the nichrome coils over the mica sheet.…”

“…The source of the heat energy can be replicated using compact heaters to aid experiments in controlled experiments. Ramesh and Anand (2019) quantitatively experimentally investigated the performance of a plate-finned heat sink. They used phase change material as a medium to store and dissipate heat energy during the experiment.…”

“…Ramesh and Anand (2019) quantitatively experimentally investigated the performance of a plate‐finned heat sink. They used phase change material as a medium to store and dissipate heat energy during the experiment.…”