Compressive mechanical properties of sawdust/high density polyethylene composites under various strain rate loadings

Abstract

This article is concerned with the static and dynamic mechanical properties of high-density polyethylene (HDPE) reinforced with sawdust (SD) at a strain rate of up to 10 3 s 21 . In this study, the static and dynamic properties of HDPE/SD composites with different filler loadings of 5, 10, 15, 20, and 30 wt% SD were deliberated at different levels of strain rates (0.001, 0.01, 0.1, 650, 900, and 1100 s 21 ) using a conventional universal testing machine and the split Hopkinson pressure bar apparatus. The results showed that the stress-strain curves, yield behavior, stiffness, and strength properties of the HDPE/SD composites were strongly affected by both the strain rate and the filler loadings. Furthermore, the rate sensitivityof the HDPE/SD composites showed a great dependency on the applied strain rate, increasing as the strain rate increased. However, the thermal activation values showed a contrary trend. Meanwhile, for the postdamage analysis, the results showed that the applied strain rates influenced the deformation behavior of the tested HDPE/ SD composites. Moreover, for the fractographic analysis at dynamic loading, the composites showed that all the specimens underwent a severe catastrophic deformation.

Mechanical and physical properties of teak leaves waste/polyurethane composites for particleboard application

“…Further, as shown in Figure 2(c), the composites with a polyurethane content of 0.17-0.20 (w/w) show some parts of polyurethane not binding to the filler, appear many voids from polyurethane polymer, teak leaves would tend to agglomerate and not bond properly which can reduce compressive strength. [22][23][24] According to Jaya et al, when the polymer was added much more than the filler there will be a very poor adhesion force between surfaces because polyurethane is a hydrophobic matrix and teak leaves powder is a hydrophilic filler. 24 Further, the raising of the strength until certain fraction is related to the maximum contact amount between the polymer and solid waste particle.…”

“…[22][23][24] According to Jaya et al, when the polymer was added much more than the filler there will be a very poor adhesion force between surfaces because polyurethane is a hydrophobic matrix and teak leaves powder is a hydrophilic filler. 24 Further, the raising of the strength until certain fraction is related to the maximum contact amount between the polymer and solid waste particle. 25 The most important interaction in the composite is predominantly emerged between the polyurethane and the cellulose in teak leaves.…”

“…The absorption area occurring at 1076 cm À1 indicates the presence of a C-O bond in the cellulose component. 24 Using the FTIR analysis, it can be shown that cellulose and lignin components are found in the teak leaves. This leaf can compete with the conventional fiber such as glass fiber regarding its high performance as reinforcing material for thermosetting and thermoplastic matrices with their naturally degradable superior properties.…”

Methylene Blue Removal From Residual Water Using Fir Wood Sawdust as Adsorbent

“…7. Specific bands characteristic to the functional groups of aromatics in cellulose [27], and bonded C-C groups in sawdust were identified at 897 cm -1 and 896 cm -1 [28]. The transmission bands under 720 cm -1 are assigned to C-H groups in cellulose [29].…”

Mechanism of Cement Paste with Different Particle Sizes of Bottom Ash as Partial Replacement in Portland Cement

“…Portland cement is composed of four primary oxides which are tricalcium silicate (C 3 S), dicalcium silicate (C 2 S), tricalcium aluminate (C 3 A), and tetracalcium aluminiferrite (C 4 AF) [27]. During the hydration process, C 3 S and C 2 S react with water to form calcium-silicatehydrate (C-S-H) gels and calcium hydroxide where these gels provide the strength to mortars or concretes [33,34,35]. Anyway, the hydration products from four oxides is Ca(OH) 2 will react with silica of bottom ash and form more C-S-H.…”