scholarly journals Pengujian Karakteristik Sepatu Kuda Bahan Komposit Polymeric Foam Berpenguat Fiberglass Menggunakan Uji Gesek Dan Pengamatan Mikroskop

2020 ◽  
Vol 1 (1) ◽  
pp. 1-7
Author(s):  
Mawardi Mawardi ◽  
Bustami Syam
Keyword(s):  
Polymeric Foam

Hasil pengujian gesek (keausan) Spesimen A nilai rata-rata untuk lebar jejak keausan (?) 1616 ?m kedalaman jejak keausan () 546.17 ?m, volume keausan eksperimental (Vp) 9.575 mm³ dan laju keausan (?p) 0.10 mm3/s. Spesimen B dengan nilai rata-rata untuk lebar jejak keausan ( ?) 2526.26 ?m, kedalaman jejak keausan () 2033.18 ?m, volume keausan eksperimental (Vp) 2.573 mm³ dan laju keausan (?p) 0.31 mm3/s. Spesimen C nilai rata-rata untuk lebar jejak keausan (?) 1079.87 ?m, kedalaman jejak keausan () 266.10 ?m, volume keausan eksperimental (Vp) 1.253 mm³ dan laju keausan (?p) 0.041 mm3/s. Spesimen D nilai rata-rata untuk lebar jejak keausan (?) 1728.20 ?m, kedalaman jejak keausan () 712.27 ?m, volume keausan eksperimental (Vp) 3.354 mm³ dan laju keausan (?p) 0.11 mm3/s. Spesimen E nilai rata-rata untuk lebar jejak keausan (?) 1788.32 ?m, kedalaman jejak keausan ()  1101.40 ?m, volume keausan eksperimental (Vp) 5.187 mm³ dan laju keausan (?p) 0.17 mm3/s.  

Using a shock tube to predict the response of polymeric foam to a blast loading

2006 ◽  
Vol 134 ◽  
pp. 783-787 ◽  
Author(s):  
S. Ouellet ◽  
D. Frost ◽  
A. Bouamoul
Keyword(s):  
Shock Tube ◽  
Blast Loading ◽  
Polymeric Foam

Objective Evaluation of Earplugs for the Control of Water-Borne Infection

1981 ◽  
Vol 90 (1) ◽  
pp. 89-93 ◽  
Author(s):  
David W. Johnson ◽  
Robert H. Maisel
Keyword(s):  
Water Pressure ◽  
Objective Evaluation ◽  
Solid Core ◽  
Petroleum Jelly ◽  
Clinical Protocol ◽  
Water Penetration ◽  
Polymeric Foam ◽  
Patient Use ◽  
Water Borne ◽  
Inhibited Water

Eighty-two cotton, foam, and solid core stock and custom earplugs were evaluated objectively for water absorption and water penetration characteristics in order to determine their efficacy for control of water-borne infection in ears having open middle ear cavities. Cotton plugs, even when saturated with petroleum jelly, had poor consistency in resisting even minimal water pressure. Polymeric foam plugs, especially when saturated with petroleum jelly, appeared to inhibit water flow in conditions approximating actual ear protection use. No plugs evaluated, including custom elastomeric solid core plugs, inhibited water penetration in conditions approximating shallow surface dives. A clinical protocol for evaluation of potential earplugs for patient use is proposed on the basis of this study.

scholarly journals Impact testing of polymeric foam using Hopkinson bars and digital image analysis

2014 ◽  
Vol 36 ◽  
pp. 101-109 ◽  
Author(s):  
Jiagui Liu ◽  
Dominique Saletti ◽  
Stéphane Pattofatto ◽  
Han Zhao
Keyword(s):  
Image Analysis ◽  
Digital Image ◽  
Digital Image Analysis ◽  
Impact Testing ◽  
Polymeric Foam

Random laser and stimulated Raman scattering in compressible porous polymeric foam

2021 ◽  
pp. 118330
Author(s):  
Tiancheng Zheng ◽  
Xueyang Li ◽  
Xianglong Cai ◽  
Chencheng Shen ◽  
Juntao Li ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Random Laser ◽  
Polymeric Foam ◽  
Stimulated Raman

scholarly journals Manufacture and Strength Analysis of Ergonomic Bicycle Helmet Made from Polymeric Foam Composite Strengthened by Oil Palm Empty Fruit Bunch Fiber with Free Fall Drop Test Method

2020 ◽  
Vol 64 (1) ◽  
pp. 33-38
Author(s):  
Mahadi Mahadi ◽  
Keyword(s):  
Oil Palm ◽  
Free Fall ◽  
Product Safety ◽  
Drop Test ◽  
Empty Fruit Bunch ◽  
Test Results ◽  
Shell Layer ◽  
Bicycle Helmet ◽  
Polymeric Foam ◽  
Foam Composite

This article contains a study report on the manufacturing of bicycle helmet models that use polymeric foam composite materials strengthened by oil palm empty fruit bunch (OPEFB). The test results of mechanical polymeric foam obtain tensile stress (σt) 1.17 MPa, compressive stress (σc) 0.51 MPa, bending stress (σb) 3.94 MPa, modulus of elasticity (E) 37.97 MPa, density ( ρ) 193 (kg / m3). The testing results of thermal conductivity (k) with ASTM C177-04 standard obtain 0.096 W/mK. Aerodynamic simulation is carried out on 5 bicycle helmet models with different variations of air ventilation formations and obtained the M4A model that best met the ergonomic criteria. The simulation results of the M4A helmet model are max 65.668 Pa of air pressure (Pu), 26,8 0C of inner wall temperature (Ti), 11.0724 m/s of air velocity (vi) and 0.89 of drag coefficient (CD). Bicycle helmet manufacturing is carried out by hand lay up method for shell layer and casting mold for liner by using GFRP polymer composite molds. Both layers are made by sandwich method with the composition of the shell layer is 100 grams resin, 15 grams glass fiber and 5 grams catalyst. The composition of the liner layer is 275 grams (50%) of unsaturated Polyester 157 BQTN-EX resin, 27.5 grams (5%) of OPEFB fiber, 247 grams (45%) of Blowing Agent Polyurethane and 27.5 grams (5%) of Methyl Ketone Perokside catalyst (MEKPO). The toughness of the helmet is tested by using a free fall drop test with the standard of Consumer Product Safety Commission (CPSC) with the height of impact 1.5 meters. The free fall drop test results are max 2.02 MPa of the impact stress of the M4A bicycle helmet model (σi) and max 283.77 joules of energy impact (Ei) which is close to the Consumer Product Safety Commission’s (CPSC) standard value of 110 joules.

Numerical Simulation of Molten Metal-Polymeric Foam Interface Velocity During Lost Foam Casting

2001 ◽  
Author(s):  
Sayavur I. Bakhtiyarov ◽  
Ruel A. Overfelt
Keyword(s):  
Molten Metal ◽  
Flow Model ◽  
Interface Velocity ◽  
Casting Process ◽  
Lost Foam Casting ◽  
Foam Material ◽  
Polymeric Foam ◽  
Gaseous Products ◽  
3D Software ◽  
Lost Foam

Abstract A novel multiphase flow model is presented for describing the pyrolisis of polymeric foam material in a lost foam casting process. FLOW-3D software (Flow Science, Inc.) has been used to simulate liquid metal filling dynamics and the molten metal-polymeric foam interface velocity in foam patterns of rectangular shape. The effect of the degradation gaseous products on the molten metal-polymeric foam interface velocity was taken into consideration through specially written sub-routing program. The results of the simulations are compared with the previously obtained experimental data for the lost foam iron casting.

Functionally graded viscoelastic core characteristics on vibroacoustic behavior of double-walled cylindrical shells in a subsonic external flow

2022 ◽  
pp. 107754632110467
Author(s):  
Shohreh Reaei ◽  
Roohollah Talebitooti
Keyword(s):  
Cylindrical Shell ◽  
Transmission Loss ◽  
Excitation Frequency ◽  
Shear Deformation Theory ◽  
Sound Transmission ◽  
Functionally Graded ◽  
Loss Coefficient ◽  
Sound Transmission Loss ◽  
Polymeric Foam ◽  
The Core

The present study is concerned with an analytical solution for calculating sound transmission loss through an infinite double-walled circular cylindrical shell with two isotropic skins and a polymeric foam core. Accordingly, the two-walled cylindrical shell is stimulated applying an acoustic oblique plane wave. The equations of motion are derived according to Hamilton’s principle using the first-order shear deformation theory for every three layers of the construction. Additionally, by the aid of employing the Zener mathematical model for the core of polymeric foam, mechanical properties are determined. To authenticate the results of this study, the damping of the core layer goes to zero. Therefore, the numerical results in this special case are compared with those of isotropic shells. The results prove that the presented model has high accuracy. It is also designated that decreasing the power-law exponent of the core leads to improving the sound transmission loss through the thickness of the construction. Besides, in addition to probe some configurations versus alterations of frequencies and dimensions, the convergence algorithm is provided. Consequently, it is realized that by increasing the excitation frequency, the minimum number of modes to find the convergence conditions is enhanced. The results also contain a comparison between the sound transmission loss coefficient for four different models of a core of a sandwiched cylindrical shell. It is comprehended that the presented model has a transmission loss coefficient more than the other types of the core at high frequencies.

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