Mechanical and electrical characterization of elastomer based pressure sensors containing graphene filler material under cycled load.

Öz

Graphene (GrF) doped elastomer based pressure sensors (PgS) were obtained in two stages. These materials were analyzed in the SEM device and the interaction between the distribution of filler materials and the resistance was examined. By applying cyclic loads for different displacement values to PgS, changes in resistance values due to the internal structure of the samples were observed. The surface area, mechanical properties and distribution shape of the conductive filler material in the matrix determine the conductivity of PgS. The decrease in resistance and increase in conductivity due to the pressure-resistance relationship is higher at 3 mm compression. The resistance change of GrF doped PgS varies as a function of the load. Although some resistance increases with the increase in force, the resistance tends to decrease as a result of the transfer of the load to the filler material. Cyclic loading-unloading tests were performed on PgS at 1mm, 2mm and 3mm displacements, and compression forces of 85 N, 273 N and 805 N were obtained, respectively. The highest resistance value was determined as 5.29Ex06 Ω after 3 mm compression. In our study, by making use of this unique feature of PgS, in the tests we made with the application of air suspension bellows on the damping bumper, which is the secondary suspension element, estimates were made about the working conditions of the bellows.

Anahtar Kelimeler

• Graphene
• Elastomers
• Pressure Sensors

Grafen dolgu malzemesi içeren elastomer esaslı basınç sensörlerinin çevrimli yük altında mekanik ve elektriksel karakterizasyonu

Öz

Grafen(GrF) katkılı elastomer esaslı basınç sensörleri (PgS) iki aşamada elde edilmiştir. Bu malzemeler SEM cihazında analiz edilerek dolgu malzemelerinin dağılımı ile direnç arasındaki etkileşimi incelenmiştir. PgS’lere, farklı deplasman değerleri için çevrimli yüklemeler uygulanarak, numunelerin iç yapısına bağlı direnç değerlerinde oluşan değişiklikler gözlemlendi. Matris içindeki iletken dolgu malzemesinin yüzey alanı, mekanik özellikleri ve dağılım şekli PgS’lerin iletkenliğini belirlemektedir. Basınç-Direnç ilişkisine bağlı olarak dirençteki azalma ve iletkenlikteki artış, 3 mm sıkıştırmada daha yüksektir. GrF katkılı PgS’lerin direnç değişimi yükün bir fonksiyonu olarak değişkenlik göstermektedir.. Uygulanan kuvvet artışı ile bir miktar direnç artsa da, yükün dolgu malzemesine aktarılması sonucu direnç düşme eğilimindedir. PgS’lere, 1mm, 2mm ve 3mm’lik deplasmanlarda çevrimli yükleme-boşaltma testleri yapılmış, sırasıyla 85 N, 273 N ve 805 N sıkıştırma kuvvetleri elde edilmiştir. En yüksek direnç değeri 3 mm sıkıştırma sonucunda 5,29Ex06 Ω olarak tespit edilmiştir. Çalışmamızda PgS’nin bu eşsiz özelliğinden yararlanarak hava süspansiyon körüklerinin ikincil süspansiyon elemanı olan sönümleme takozu üzerine uygulaması ile yaptığımız testlerde, körüğün çalışma şartları ile ilgili tahminler yapılmıştır.

Anahtar Kelimeler

• Grafen
• Elastomerler
• Basınç Sensörleri
• Sıkıştırma

Kaynakça

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