SEÇİCİ LASER ERGİTME YÖNTEMİ İLE ÜRETİLMİŞ DIN 1.4404

Bu çalışmada, diş protez ve implant üretiminde sıklıkla kullanılan, Seçici Lazer Ergitme metodu ile üretilmiş AISI 316 L (DIN 1.4404) malzemenin Elektro Erozyon yöntemi (EDM) ile işlenebilirliğinin araştırılması için deneysel çalışmalar gerçekleştirilmiştir. Deneylerde bakır ve grafit olmak üzere iki farklı elektrot kullanılmıştır. Akım (amper, I) ve pulse on-time (µs, ton) değerleri değiştirilerek deney parametreleri oluşturulmuştur. Elektrotlarda meydana gelen aşınma (EW) değerleri, yüzey pürüzlülük (Ra) değerleri ve malzemeden kalkan talaş kaldırma oranı (MRR) değerleri incelenmiştir

THE EFFECT OF WASHING PROCESSES ON THE ELECTROMAGNETIC SHIELDING OF KNITTED FABRICS

Nowadays electromagnetic shielding is getting more importance due to the widely usage of electronics such as mobile phones, televisions etc. There are many studies on the electromagnetic shielding effects of the conductive textile structures. However there are no researches on the shielding effect of the fabrics after washing cycles and also there are no researches on the physical properties of these fabrics. For this reason, firstly some physical properties of conductive fabrics used for electromagnetic shielding is studied in this study. Furthermore, shielding properties of the fabrics after washing cycles are discussed

Some investigations on the design of medical cooling garments

Çok sıcak ortamlarda bulunma-çalısma, çesitli biyolojik rahatsızlıklar gibi durumlar sonucunda insan vücudunun sıcaklıgı yükselmektedir. Bu sıcaklıgı düsürmek amacıyla özel giysiler kullanılmaktadır. Bu giysilere mikroiklim sogutmalı giysiler adı verilmektedir. Su, hava ve faz degistiren materyaller kullanarak sogutma yapan sistemler mevcuttur. Askeri alanlarda, uzay giysilerinde ve endüstriyel alanda kullanılan koruyucu giysilerin içinde, tıp alanında çesitli hastalıkların belirtilerinin hafifletilmesinde (Multipl skleroz ve ektodermal displazi) ve doktorların cerrahi giysilerinin içinde, bu sistemler kullanılmaktadır. Mikroiklim sogutmalı giysi çesitlerinden biri olan su sogutmalı sistemler yurt dısında yaygın olarak arastırılmaktadır. Ancak ülkemizde bu sistemlerle ilgili bir çalısmaya rastlanmamıstır. Bu çalısmada da yurt dısında olusturulan diger sogutmalı giysilerden farklı yapılarda tıbbi amaçlı dört farklı su sogutmalı giysi tasarlanmıstır ve bu giysilerin sogutma etkisini test etmek için bir test yöntemi gelistirilmistir. Bu amaçla giysilere soguk suyu pompalayacak bir sogutma cihazı ve bir termal manken tasarlanmıs ve imal ettirilmistir. Yapılan deneylerde su giris sıcaklıgının ve suyun debisinin degisimlerinin sogutmaya etkisi ve mankenin vücut sıcaklıgı degisimleri incelenmistir. The body temperatures of individuals could increase when they are working in hot conditions, when they have special illness etc. In order to decrease this temperature, special garments are needed. These garments are called microclimate cooling garments and can be classified as water cooling, air cooling and phase changing materials cooling systems. They are used in military clothes, space suits, protective clothes, in surgical clothes and in medical field to relieve the symptoms of special diseases like multiple sclerosis and ectodermal dysplasias. Liquid cooling garments are one of the most popular topics about investigation of cooling systems. But there is no research about these systems in our country. In this work, four types of water cooling garments, which are different from the other researches, are designed. In order to investigate the cooling effects of these garments, a test method is developed. For this aim a cooling device which is pumping the water into these garments and a thermal manikin are designed and manufactured. The effects of water inlet temperature and flow rate on cooling effect and the differences of manikin temperature are investigated

Basic studies for modeling complex weft knitted fabric structures Part IV: Geometrical modeling of miss stitches

In this work a model of miss stitch and its effect on the plain knitted fabric structure are introduced for the first time, thus we present a pioneering basic work on knit and miss combinations. Photographs of knitted samples were taken and the assumptions of the model are based on these photographs. A geometrical model of this knit and miss combination is created and the model is drawn to scale. We show that these shapes are found to be exactly the same shapes as observed in real fabrics

Effect of Garment Design on Liquid Cooling Garments

In this study, two different types of liquid cooling garments are designed and their cooling effects are comparatively investigated. The tubing lengths and the inner layers of these garments are taken as the same, and the other parameters of the garments differed. In the outer layer of the garments, 10 x 3 rib and single jersey knitted wool fabrics are used. In the inner layer of the fabrics, cotton wound dressings are used. In one garment design, S-shaped sponges are used as the mid layer. For 10 x 3 rib the mid layer is obtained by three loops of 10 x 3 rib, and the outer layer is obtained by 10 loops of 10 x 3 rib, due to its three-dimensional structure. To test these garments, a thermal manikin and a chiller are developed. The effects of water inlet temperature and flow rate on the cooling effect are examined. Outer garments of 10 x 3 rib structure are found to provide effective cooling. When the water inlet temperature decreases, the effective cooling slightly increases. At lower flow rates, effective cooling increases slightly, while this effect disappears for higher flow rates