Static and dynamic compressive properties of mica/polypropylene composites

Particle size – Dependent on the static and dynamic compression properties of polypropylene/silica composites

“…On arrival at the specimen, a certain amount of the generated pulse is reflected back towards the impacted end, whilst the remainder of the pulse is transmitted through the specimen to the second bar (i.e., the transmitter bar). The wave path along the silver steel Hopkinson bars was summarised into a Langarian x-t diagram, which can be found in our previous studies [10,11]. Theoretically, the reflected and transmitted pulses were proportional to the specimen's strain rate and stress, respectively [12].…”

“…Apart from that, calibration and verification steps should also be performed during the high strain rate testing, in order to ensure stress equilibrium along the high strain rate testing. Therefore, we performed several calibration methods in our previous studies [10,11,16] to fulfil that requirement. Based on the calibration results reported previously, it is convenient to say that our SHPB set-up is reliable and perfectly aligned; and therefore, ready for further investigation.…”

“…Obviously, all of the PP/SiO 2 specimens tested showed a positive increment in yield strength, with an increasing loading rate. This phenomenon was directly attributed to the viscoelastic properties [11,28] of the polypropylene and the mobility of the polymer chains during loading [29]. Guo and Li [21] reported that increasing loading rate will gradually decrease the mobility of the polymer chains, and therefore, higher stress is required to generate a certain deformation (i.e., strain).…”

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

“…Hypothetically, restriction of the polymer chain movement at high strain rate loading may also enhance the formation of additional Van der Waals interactions between structures. These additional interactions strengthen the polymer composite as the strain rate increases (Omar et al 2011b).…”

Mechanical response of polycarbonate nanocomposites to high velocity impact

“…When a material deforms rapidly, such as in a high speed collision or impact, the mechanical response of that material can be noticeably different to the response observed by more traditional testing techniques. The impact response is strongly dependent on the temperature sensitivity, strain hardening and strain rate sensitivity of a material [13][14][15][16][17][18][19][20]. However, to date there is relatively little published work on the high strain rate deformation of polymeric material compared to metallic materials, and there are even fewer papers reporting the study of the mechanical properties of these types of nanocomposite materials at high impact strain rates.…”