Eriyik yığma modelleme ile üretilen PET-G parçaların katman yüksekliğine ve test sıcaklığına bağlı darbe davranışı

Yıl 2023, Cilt: 38 Sayı: 3, 1345 - 1360, 06.01.2023

Berkay Ergene , Hasan Ispartalı Uçan Karakılınç

https://doi.org/10.17341/gazimmfd.1065131

Cited By: 1

Öz

Son yüzyılda, polilaktik asit (PLA), akrilonitril bütadien stiren (ABS) ve polietilen tereftalat glikol (PET-G) gibi polimer malzemeler hafif, ucuz, sürdürülebilir olması ve mühendislik uygulamaları için yeterli dayanımı sağladıklarından dolayı bir çok endüstriyel alanda sıklıkla kullanılmaktadır. Plastik malzemeler çoğunlukla ekstrüzyon metoduyla üretilse de, üç boyutlu (3B) baskı yöntemi de geleneksel imalat yöntemlerine göre avantajlarından dolayı son on yılda araştırmacıların dikkatini çekmektedir. 3B baskı ile üretilen polimerlerle ilgili literatürdeki çalışmalar incelendiğinde, çalışmaların çoğunlukla çekme, basma, üç nokta eğme gibi mekanik performansı belirleyici testler üzerine odaklandığı görülmektedir. Bu çalışmada ise, eriyik yığma modelleme (EYM) metoduyla üretilen PET-G parçaların sertlik ve çekme dayanımlarının belirlenmesinin yanı sıra, parçaların 20 ⁰C, 40 ⁰C ve 60 ⁰C gibi farklı ortam sıcaklıklarındaki ağırlık düşürme darbe yanıtına, katman yüksekliğinin (0,1 mm, 0,2 mm ve 0,4 mm) etkisi araştırılmıştır. Sonuçlar göstermektedir ki, katman yüksekliği 0,4 mm olan parçada maksimum ortalama sertlik değeri 69,4 Shore D olarak elde edilirken, minimum ortalama çekme dayanım değeri ise 39.24 MPa olarak aynı parçada gözlemlenmiştir. Ayrıca, enerji emmede katman yüksekliğinin test sıcaklığından daha baskın olduğu belirlenmiştir. Sonuç olarak, 60 ⁰C ortam sıcaklığında test edilen 0,1 mm katman yüksekliğindeki numunede maksimum emilen enerji 67.335 J olarak gözlemlenmiştir. Öte yandan, 0,4 mm katman yüksekliğine sahip ve 40 ⁰C ortam sıcaklığında test edilen numune, 28.070 J ile minimum enerji emmiştir. Son olarak makroskopik ve mikroskobik tespitlere göre 0,4 mm katman yüksekliğine sahip numunelerde herhangi bir çatlak gözlemlenmezken, katman yüksekliği 0,1 mm ve 0,2 mm olan numunelerde ise merkezden köşelere doğru uzanan çatlakların oluştuğu tespit edilmiştir.

Anahtar Kelimeler

Eriyik yığma modelleme, PET-G, Ağırlık düşürme darbe yanıtı, Enerji emme, Test sıcaklığı

Destekleyen Kurum

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Proje Numarası

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Teşekkür

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Kaynakça

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