بهزاد بازیار Articles List

List of Articles بهزاد بازیار

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1 - Study of the biodegradability and thermal properties of wood-plastic composite obtained from wood flour, polyhydroxybutyrate and starch
Hoda Norouzpour Amir hooman Hemmasi Mohammad Talaeipoor Behzad Bazyar Majid Abdous
10.30495/jrnr.2023.73257.10289

The growing concern about environmental pollution has increased the demand for biodegradable materials worldwide. Natural polymers are used in composite manufacturing to prevent environmental damage, reduce costs, and replace synthetic polymers. In this research, the bi More

The growing concern about environmental pollution has increased the demand for biodegradable materials worldwide. Natural polymers are used in composite manufacturing to prevent environmental damage, reduce costs, and replace synthetic polymers. In this research, the biodegradability and thermal properties of the wood-plastic composite were investigated. Beechwood flour with a weight ratio of 40 % and a particle size of 80 mesh was used to make the samples as a reinforcement of the matrix. The studied polymer to make the composite biodegradable was polyhydroxy butyrate (PHB). Starch with a weight percentage of 8 and 12 % was used as copolymer, nanoclay was used to improve properties, and maleic anhydride was used as a coupling agent. The samples were mixed using a twin-screw extruder and made with an injection machine. Then, they were subjected to thermogravimetric analysis, differential scanning calorimetry, and biodegradability tests. In terms of thermal properties, a degradation temperature of about 250 ºC was achieved with the presence of wood flour as a filler and other additives, which showed improvement compared to PHB biopolymer which is in the range of 95 ºC. The glass transition temperature increased and this value in the pure polymer was 5 and it showed an increase up to 68 degrees in the results obtained from the composite, however, the melting and crystallinity were decreased in both. In the biodegradable test, the samples containing PHB showed good degradability properties. The weight loss occurred due to the destruction of wood flour, starch, and natural polymer by soil microorganisms. The produced composite samples in this research are completely biodegradable. Manuscript profile
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2 - Effect of artificial inhomogeneity of density on dynamic shear modulus of Oak wood (Quercus castaneifolia)
Mostafa Kohantorabi Amir Hooman Hemmasi Mohammad Talaeipour Mehran Roohnia Behzad Bazyar
10.30495/jrnr.2021.18360

In this study, the effect of artificial inhomogeneity of density in the initial and middle of Oak wood beams (Quercus castaneifolia) by the changes in the dynamic shear modulus values obtained from the free vibration in free-free beam method have been investigated. For More

In this study, the effect of artificial inhomogeneity of density in the initial and middle of Oak wood beams (Quercus castaneifolia) by the changes in the dynamic shear modulus values obtained from the free vibration in free-free beam method have been investigated. For this purpose, 10 specimens of Oak wood species with a dimension of 720×40×20 mm (longitudinal, radial, and tangential) were tested by the free flexural vibration method to determine the shear modulus in the solid wood beams. After that, the samples were divided into two groups and from the first group, the blocks with a dimension of 40×40×20 mm from the initial part, and from the second group, the blocks with the mentioned dimension were extracted from the middle part of the solid beams, and jointed to each other by polyvinyl acetate adhesive. After the jointing, the free bending vibration test was performed on both groups again. Afterward, the Oak blocks were removed from the junction and in two stages, blocks of two species of Poplar wood (Populus nigra) and Iron wood (Parrotia persica) were replaced and in order to the effect of artificial inhomogeneity created by each of the replaced blocks on the values of the shear modulus, the flexural vibration test was performed on them. The results showed that the development of artificial inhomogeneity of density in the initial area of the beam by all three species of Oak, Poplar, and Iron wood did not have a significant effect on the values of dynamic shear modulus, while creating inhomogeneity in the middle of the beam has caused a significant drop in the values of this factor. Heterogeneous beams by Iron wood species had the highest, and heterogeneous beams by Oak wood species had the lowest percentage decrease in dynamic shear modulus values. Manuscript profile
Open Access Article
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3 - Application of statistical quality control process in Kishwood industrial company
Hirsa Jouya Ardekani Behzad Bazyar Amirhooman Hemmasi Morteza i Khakzar Bafrue
10.30495/jrnr.2021.18442

In this research, application of statistical quality control process in Kishwood industrial company has been investigated. Statistical quality control process includes control charts and acceptance samplings. In this study, qualitative and quantitave characteristics of More

In this research, application of statistical quality control process in Kishwood industrial company has been investigated. Statistical quality control process includes control charts and acceptance samplings. In this study, qualitative and quantitave characteristics of raw material and work in progress was investigated using standard tables and control charts ( U) were designed  for grooving, drilling, laminating and edge banding processes. In the raw material and work in progress, medium density fiberboard (16mm) lots, HPL veneer, purchased ABS stripe and the distance of the double hole from the edge of the piece in terms of quantative characteristic were investigated by MIL-STD-414 tables. In addition, purchased veneered particle board lot and the accuracy of the stripe in cabinet bottom parts in terms of qualitative characteristic were investigated by MIL-STD-105E tables. All the results were compatible with the acceptable standards of the company. Since lots data were located in the control limits, we can conclude that the whole process had been under control during the research time and can be used to control the future of the process. By calculating the process capability index (CP), it was found that grooving and drilling process have a very high capability, so the percentage of waste in these two processes is very low. Manuscript profile

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