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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) INDONESIAN JOURNAL OF APPLIED PHYSICS Wahana Fisika : Jurnal Fisika dan Terapannya
Yusril Yusuf
Universitas Gadjah Mada
Astronomy Earth & Planetary Sciences Education Energy Engineering Materials Science & Nanotechnology Physics

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A New Model to Calculate Stress Relaxation of Viscoelastic Material for Polyester-Wool-Spandex Yarn with Analytical Mechanics Approach Valentinus Galih Vidia Putra; Juliany Ningsih Mohamad; Yusril Yusuf
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 11 No. 2 (2021)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v11n2.p94-105

Abstract

Many researchers have studied the mechanical properties of yarn in textile science because mechanical properties are the essential parameter in determining yarn quality. This research aims to make a new model and prediction of the material properties of textile yarns, especially for stress relaxation of viscoelastic textile yarn for polyester-wool-spandex yarn cases. In this research, a new approximation of the analytical mechanics model of stress relaxation using a system of four springs and a dashpot to determine viscoelastic yarn properties as polyester-wool-spandex has been studied. A yarn movement equation for viscoelastic yarn as polyester-wool-spandex having 36 yarn count number (in unit tex or g/km) has been formulated using analytical mechanics, and the model has been validated experimentally. The coefficient of determination R2 ranges from 0.82, which shows the closeness between the experimental results and the theoretical predictions. In this research, it is found that this model can be implemented to determine the viscoelastic material of yarn based on the properties of yarn as stress relaxation using the analytical mechanics approach.  
Study of Surface Tension Properties looked on Contact Angle Value on 100% Nylon Textile Fabric Using Corona Discharge Plasma Technology Valentinus Galih Vidia Putra; Juliany Ningsih Mohamad; Yusril Yusuf
Wahana Fisika Vol 5, No 1 (2020): June
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/wafi.v5i1.22382

Abstract

This paper provides an explanation of the application of corona discharge plasma in textile field specially for modification  of surface properties and wet ability of nylon 100% fabric. In this research, we have found that the properties of  wet ability of nylon 100% fabric with 70 / inch of weft density and 60/inch of warp density  is influenced by  corona discharged plasma analyzed by the contact angle of the fabric on capillarity phenomena under same test time for contact angle test.       Artikel ini menjabarkan  pemanfaatan aplikasi teknologi plasma pijar korona pada bidang tekstil dalam modifikasi sifat pembasahan pada permukaan kain nilon 100% ditinjau dari sifat fenomena kapilaritas. Hasil riset memperlihatkan bahwa dengan perlakuan plasma pada kain nilon 100% dengan tetal pakan dan lusi masing-masing 70 helai/inci dan 60 helai/inci didapatkan  bahwa terdapat perubahan sifat hidrofilik (dapat lebih mudah menyerap) kain melalui perubahan sudut kontak pada fenomena kapilaritas untuk waktu uji sudut kontak yang sama.
A Study of Anti-Radiation Weaving Fabric with Plasma Corona Treatment Valentinus Galih Vidia Putra; Irwan Irwan; Ichsan Purnama; Juliany Ningsih Mohamad; Yusril Yusuf
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 1 (2021): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v11i1.40833

Abstract

In this research, Carbon black particles were applied on the woven fabric by the knife coating technique and pretreatment using plasma corona discharge to build-up conductive cotton-polyester (CVC 50%) fabric electromagnetic shielding material. This paper describes the making of anti-radiation weaving fabric using plasma technology. The anti-radiation patch was developed by first modifying the textile fabric's surface using atmospheric pressure plasma technology using tip-cylinder electrode configuration. The plasma corona discharge was generated using high voltage electricity with asymmetrical electrodes (tip and cylinder). The treated weaving fabric using plasma was then coated with carbon black ink. This research indicates that an anti-radiation weaving fabric was successfully shielded electromagnetic radiation from an electronic device.
Co-Authors Irwan Irwan Mohamad, Juliany Ningsih Purnama, Ichsan Valentinus Galih Vidia Putra Valentinus Galih Vidia Putra Valentinus Galih Vidia Putra