scholarly journals PEMBUATAN PERAHU NELAYAN BERBAHAN KOMPOSIT SANDWICH DENGAN TEKNIK HAND LAY UP

2020 ◽  
Vol 15 (2) ◽  
Author(s):  
Agus Dwi Catur
Keyword(s):  
Polyurethane Foam ◽  
Fiber Glass ◽  
Rigid Foam ◽  
Polyurethane Rigid Foam

Perahu kayu masih mendominasi sebagai alat mencari ikan oleh nelayan. Semakin mahalnya dan terbatasnya kayu membuat perahu kayu menjadi mahal.  Diperlukan perahu yang ringan setara dengan perahu kayu tetapi tetap kuat sebagai alternatif penggantinya.  Prototype perahu berbahan komposit sandwich dengan penguat serat bambu-fiberglass dan dengan core berupa polyurethane rigid foam telah dirancang dan dibuat dengan teknik hand lay up.  Cara pembuatan perahu, jumlah material, alat yang dipakai, jumlah tenaga kerja dipelajari dan dihitung  agar dapat dipakai sebagai acuan dalam memproduksi perahu berbahan komposit sandwich..  Bahan core lambung perahu nelayan dibuat dengan mereaksikan polyisocyanate dan polyol cair yang membentuk polyurethane foam di dalam cetakan.  Sedangkan skin lambung perahu dibuat dengan melaminasi core lambung perahu dengan komposit resin diperkuat fiber glass dan anyaman bambu. Bagian utama perahu yang dibuat dari kayu adalah baruyungan dan dudukannya, tiang pancang layar, dudukan mesin, sedangkan cadik dibuat dari pralon PVC.  Jumlah bahan, peralatan serta jumlah orang  yang diperlukan pada setiap tahap pembuatan perahu ditabulasikan pada tulisan ini.  Teknik hand lay up sangatlah sederhana, tidak memerlukan peralatan yang banyak maupun canggih sehingga mudah diterapkan bahkan oleh nelayan tradisional. Bahan untuk membuat perahu nelayan berbahan komposit sandwich juga mudah di dapat dan dalam jumlah yang tidak banyak dengan harga yang terjangkau.  Pengerjaan pembuatan perahu nelayan berbahan komposit sandwich dengan teknik hand lay up memerlukan tenaga manusia sebanyak  12 orang hari

Numerical Modeling of the Impact Behavior of a Polyurethane Foam Specimen

2015 ◽  
Vol 760 ◽  
pp. 347-352
Author(s):  
Gabi Jiga ◽  
Ştefan Stamin
Keyword(s):  
Polyurethane Foam ◽  
Thin Layers ◽  
Impact Behavior ◽  
Foam Core ◽  
Structural Components ◽  
New Materials ◽  
Rigid Foam ◽  
Specific Performance ◽  
The Impact ◽  
Polyurethane Rigid Foam

The increasing interest for new materials in designing of new structures led to a real need to use powerful analysis tools, able to take into account correctly, their specific performance. Advantages of multilayer structures are now well understood, these materials having already part of the structural components of aeronautics and not only. The use of polyurethane rigid foam (PU) has grown rapidly, due to the excellent properties of energy conservation, a good combination of mechanical strength and weight - lower than other traditional materials with similar mechanical properties. In this paper the authors create a numerical model of polyurethane foam which will be used in further studies of impact behavior of sandwich structures with a polyurethane foam core, coated with steel or aluminum thin layers.

The Study of Melamine Modified by Imidazolium Based Ionic Liquid [BMIM]PF6 on the Flame Retardancy of Rigid Polyurethane Foam

2014 ◽  
Vol 1030-1032 ◽  
pp. 241-245 ◽  
Author(s):  
Yan Wei Li
Keyword(s):  
Ionic Liquid ◽  
Flame Retardant ◽  
Polyurethane Foam ◽  
Fire Retardant ◽  
Rigid Polyurethane Foam ◽  
Flame Resistance ◽  
Initial Decomposition Temperature ◽  
Noticeable Effect ◽  
Rigid Foam ◽  
Flame Retardant Properties

In this paper, the effect of C3H6N6modified by imidazolium based Ionic Liquid 1-butyl-methylimidazolium hexafluorophosphate ([BMIM]PF6) on polyurethane rigid foam flame retardant properties was conducted.The results show that the flame retardant properties of C3H6N6 modified with Ionic Liquid significantly increased and the LOI increased form 22.3 to 24.5. In the modification process, the ionic liquid mass have a very noticeable effect to the flame retardant property and when [BMIM]PF6 and C3H6N6 in quality was 4:6, Fire-retardant effect was best.Compared with the prior to the modification, C3H6N6 modified can increase effective Flame resistance of materials, horizontal burning speed from 67.6mm/min down to 33.4mm/min.Thermal degradation data show that C3H6N6 modified could improve initial decomposition temperature and reminder yield of rigid polyurethane foam,and then heat release reduced, the decomposition controlled,thermal stability increased.

Heterogeneous lightweight configuration for protection against 7.62 × 39 mm bullet impact

2019 ◽  
Vol 10 (3) ◽  
pp. 289-305
Author(s):  
Khurshid Ahmed ◽  
Abdul Qadeer Malik ◽  
Iram Raza Ahmad
Keyword(s):  
Polyurethane Foam ◽  
High Speed ◽  
Close Agreement ◽  
Body Armor ◽  
Critical Infrastructures ◽  
High Speed Camera ◽  
Fiber Glass ◽  
Steel Core ◽  
Blunt Force Trauma ◽  
Average Impact

Configuration of a heterogeneous lightweight material is investigated numerically and experimentally, for protection against 7.62 × 39 mm mild steel core bullet impact. The configuration consists of alumina (Al2O3) tile followed by fiber glass and polyurethane foam, all covered with kev-epoxy layer. Numerical simulations were performed using ANSYS AUTODYN. The 10-mm thick alumina completely disrupts the impacting bullet through blunting and erosion. The fiber glass and polyurethane foam disperse and absorb the propagation of shock wave, respectively. The kev-epoxy cladding seizes any scattering of brittle alumina fragments. The average impact velocity of the bullet was measured to be 710 m/s using high-speed camera. A 10-mm depth of depression spread over a wider area of 3.92 sq in of torso was recorded in blunt force trauma test, which was well within the European, German, and British standards that allow a 20–25 mm backface signature. Due to these characteristics it can be employed as body armor, vehicle armor, and for the safety and security of other critical infrastructures against this bullet and fragment impact. The residual mushroom-shaped bullet and its length of 9.3 mm in numerical simulation is in close agreement with the measured value of the 8.0 mm recovered bullet size and shape.

scholarly journals Evaluation of an Experimentally Designed Molecular Imprinted Polyurethane Foam Performance for Extraction of Alprazolam

2019 ◽  
Vol 57 (7) ◽  
pp. 662-670
Author(s):  
Zeynab Tavakoli ◽  
Majid Soleimani ◽  
Mir Mohammad Alavi Nikje
Keyword(s):  
Polyurethane Foam ◽  
High Efficiency ◽  
Solid Phase ◽  
Selective Adsorption ◽  
Selective Extraction ◽  
Extraction Methods ◽  
Effective Parameters ◽  
Rigid Foam ◽  
Adsorption Processes ◽  
Central Composite

Abstract Industrial polyurethane rigid foam (PUF) was selected as a substrate for selective solid phase extraction of Alprazolam. Effective parameters for raising selectivity of the PUF were evaluated. Synthetic molecularly imprinted polyurethane foam (MIPUF) was tracked as selective adsorbent and its characteristic was pondered by analytical methods. Optimization was done by central composite design (CCD) to have high efficiency of the polymer adsorption. Two different extraction methods were compared in the selective adsorption processes using MIPUF and NIPUF, batch system and continuous (cartridge) system. Results of the adsorption of alprazolam on the MIPUF had 39% more recovery than NIPUF (reference polymer). Then, the proposed method suggests a selective extraction of mentioned analyte from urine and tablets as complex matrixes.

Preparation of magnetic polyurethane rigid foam nanocomposites

2012 ◽  
Vol 291 (4) ◽  
pp. 903-909 ◽  
Author(s):  
Mir Mohammad Alavi Nikje ◽  
Mohammad Amin Farahmand Nejad ◽  
Keyvan Shabani ◽  
Moslem Haghshenas
Keyword(s):  
Rigid Foam ◽  
Polyurethane Rigid Foam
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