Effect of Particle Size on Mechanical Properties of Sawdust-High Density Polyethylene Composites under Various Strain Rates

Abstract

There is a need to understand the effect of wood particle size, as it affects the characteristics of wood-based composites. This study considers the effect of wood particle size relative to the dynamic behavior of wood composites. The compression Split Hopkinson Pressure Bar (SHPB) was introduced to execute dynamic compression testing at the strain rate of 650 s , whereas a conventional universal testing machine (UTM) was used to perform static compression testing at the strain rate of 0.1 s , and 0.001 s -1 for four different particle sizes (63 µm, 125 µm, 250 µm, and 500 µm). The results showed that mechanical properties of composites were positively affected by the particle sizes, where the smallest particle size gave the highest values compared to the others. Moreover, the particle size also affected the rate sensitivity and the thermal activation volume of sawdust/HDPE, where smaller particles resulted in lower rate sensitivity. For the post-damage analysis, the applied strain rates influenced deformation behavior differently for all particle sizes of the specimens. In a fractographic analysis under dynamic loading, the composites with large particles experienced severe catastrophic deformation and damages compared to the smaller particles.

Development and characterization of green automotive brake pads from waste shells of giant African snail (Achatina achatina L.)

“…Obviously, for a fixed volume of brakepad matrix the sample with higher particle size, hence higher pores sizes and distribution will exhibit less mass, and hence less density which corroborates the model result. This explains the results earlier obtained by Dagwa et al [2], Yawas et al [4], Zykova et al [9], Ameh et al [10] and Jaya et al [6].…”

“…During braking, the brakes are exposed to continuous compressive force and the result show that the 90µm sample will do well under such conditions. The observed trend in the relationship between compressive strength and grain size is corroborated by the conclusions of Yawas et al [4] and Jaya et al [6].…”

“…In tribological parlance, engineering materials that have negligible negative impacts on human and animal health, as well as, the environment are considered to be "green" materials, and hence the need to explore biodegradable materials. Locally available biodegradable materials such as, Rice husk and rice straw [1], palm kernel shells [2], coconut shells [3], periwinkle shells [4], [5] and saw-dust [6], have been explored with varying performance levels.…”

High‐strain‐rate mechanical performance of particle‐ and fiber‐reinforced polymer composites measured with split Hopkinson bar: A review

“…Compressive strength, at different filler weight contents and strain rates of PP/S, [112] PP/ZnO, [57] E/S, [113] E/ GO, [114] E/CNT, [115] PE/GNP, [116] PE/C, [117] E/PS, [118] and PE/SD. [119] C, clay; E, epoxy; GO, graphene oxide; GNP, graphene nanoplatelets; PE, polyethylene; PP, polypropylene; PS, polystyrene microspheres; S, silica; SD, sawdust; ZnO, zinc oxide F I G U R E 1 4 Compressive modulus (measured at a strain rate of 10 3 s À1 ), at different filler weight content of PP/S, [112] PP/ ZnO, [57] E/GO, [114] PE/C, [117] E/PS, [118] and PE/SD, [119] and E/GNP. [120] C, clay; E, epoxy; GO, graphene oxide; GNP, graphene nanoplatelets; PE, polyethylene; PP, polypropylene; PS, polystyrene microspheres; S, silica; SD, sawdust; ZnO, zinc oxide the strength of the particle-matrix interfacial bonding strength is more important than the quality of the particle dispersion, in terms of an enhancement in mechanical properties.…”

Particle Size Effect on Mechanical and Physical Properties of Rice Straw Epoxy Resin Particleboard

“…Astari et al showed that the physical and mechanical properties of wood-waste particleboard depend on the size of the particle [19]. Other studies found that the mechanical property of composite may depend on particle sizes [20][21][22]. The previous work of rice straw epoxy resin composite was only studied for 20 mesh particle size of the rice straw [16].…”