Fiber orientation effect on fracture toughness of silk fiber-reinforced zeolite/HDPE composites

Purnomo, Purnomo; Setyarini, Putu Hadi; Anggono, D Agus

doi:10.5937/fme2101128p

Cited by 2 publications

(2 citation statements)

References 42 publications

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“…In a number of publications [18][19][20][21][22][23], it was shown that this aim could also be achieved by adding whisker components, which increase the bending strength and fracture toughness of composites. For example, in [19], hBN phases were successfully fabricated via the highpressure sintering of a mixture of SiC w and cBN nanopowders.…”

Section: Literature Reviewmentioning

confidence: 99%

Intermittent machining of hardened steels with different types of PcBN cutting tools

Sergiyovych,

Anatoliyovych,

Oleksiyovich

et al. 2023

FME Transactions

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The paper discusses the results of the experimental investigation of the performance of several grades of PcBN cutting composites in conditions of the interrupted machining of hardened steel. Both BH and BL types of PcBN indexable inserts with additions of Si3N4, TiC, and TiCN were tested, and cutting speed varied to assess the possibility of applying these cutting tools in different conditions. It has been shown that BL PcBN can be utilized for turning with shock loads in case of high cutting speed and low depth of cut (0,2 mm). While in the range of comparatively low cutting speeds BL cutting tools are actually inoperable, and because of microchipping of polycrystalline fragments and brittle destruction of the cutting edge, an increase of the cutting speed to 210 m/min changes wear pattern and formation of the wear land. As well as this, measurement of the form and values of the cutting forces impulses revealed the effect of their peak growth by up to 40%. The danger of shock impulses was analyzed by FEM modeling, and it was demonstrated that during impacts, the maximal value of the third Principal stress exceeds the average level of compressive stresses during continuous cutting by 1.6 times, which can cause damage to the cutting tool. The data on the estimation of tool fracture probability depending on loading conditions are presented, and the possibility of reducing such probability is shown.

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Section: Literature Reviewmentioning

confidence: 99%

Intermittent machining of hardened steels with different types of PcBN cutting tools

Sergiyovych,

Anatoliyovych,

Oleksiyovich

et al. 2023

FME Transactions

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“…Biopolyols that are synthesized from vegetable oils are a great alternative to replace petrochemical polyols. Oleochemical polyols have several characteristics, such as flexible, mechanical and chemical resistant, hard, and hydrophobic (Borowicz, Paciorek-Sadowska, and Isbrandt, 2020;Purnomo, Setyarini, and Anggono, 2020;Lavrenyuk, Parhomenko, and Mykhalichko, 2019). They are required in the manufacturing industries such as flooring, coatings, and foaming in the polymer industry, polyols are compounds that contain hydroxyl function groups that can be used for other chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Hydroxylation Kinetics of Epoxidized Tung Oil Using Methanol as Nucleophilic Agent

Budiyati¹,

Rochmadi²,

Budiman³

et al. 2023

IJTech

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The synthesis of vegetable oil-based polyols has been carried out through the epoxidation-hydroxylation process. However, Tung oil has never been explored in the process, even though Tung oil has a high double bond. Epoxidized Tung Oil (ETO) with oxirane numbers of 3.92 to 4.04 mmol/g were hydroxylated with methanol and catalyzed by Sulfuric Acid (H2SO4). The objective of this study is to produce polyols from ETO and to evaluate the influence of temperature and catalyst concentration on the hydroxylation process. A second-order reaction kinetic study was also developed to represent the reaction. The ETO hydroxylation was carried out in a batch reactor for four hours. The reaction rate was determined based on the concentration of ETO (oxirane number) and Hydroxyl Value (OHV). The result shows that temperature and catalyst concentration have a directly proportional correlation to OHV and are inversely proportional to the concentration of ETO (epoxy). For temperatures above 40°C, the decreasing rate of the epoxy concentration at the beginning was relatively much faster than at the end of the reaction. In the temperature variation, the highest OHV obtained was 3.70 mmolKOH/g or 207.39 mgKOH/g at 80°C. The optimum catalyst concentration obtained in this study was 3%. The evaluated kinetics model gave great results for all reaction temperatures, with the highest total SSE for epoxy concentration and OHV data fitting of 0.156 and 0.045, respectively. The calculated activation energy (Ea) was 30.41 kJ/mol and the pre-exponential factor (A) was 255.00 g.mmol -1 .min -1 .

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Fiber orientation effect on fracture toughness of silk fiber-reinforced zeolite/HDPE composites

Cited by 2 publications

References 42 publications

Intermittent machining of hardened steels with different types of PcBN cutting tools

Intermittent machining of hardened steels with different types of PcBN cutting tools

Hydroxylation Kinetics of Epoxidized Tung Oil Using Methanol as Nucleophilic Agent

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