Ticari Polipropilenin Viskoelastik Karakterizasyonu ve Mekanik Histerezis Davranışı

Öz

Bu projenin temel amacı, bir polipropilen malzemenin viskoelastik davranışını incelemektir. Viskoelastisite teorisi, tam bir analiz yapmak için bir polipropilen malzemenin matematiksel olarak nasıl modellenebileceğini anlamak için kullanılır. Polipropilen malzemenin zamana bağlı gerilme-uzama tepkisi, malzeme ile yapılan gevşeme testi ile araştırılır. Daha sonra esneklik veya sertlik gibi matematiksel modeller için gerekli parametreler, k veya E, gevşeme süresi ile birlikte, τ, bu davranışı göstermektedir. Deneylerden gelen yanıt eğrisi, Marc yazılımı üzerinde bir sonlu eleman analizini tamamlamak için matematiksel modelleri içeren teori ile analitik çalışma ile karşılaştırılmıştır. Bu analizden elde edilen eğri, analitik çalışmadan gelenle örtüşmektedir. Dinamik analiz testini simüle etmek için Marc'ta zorunlu salınım prosedürü gerçekleştirilmiş ve numunenin dahili enerji kaybı histerezis grafiği ile incelenmiştir.

Anahtar Kelimeler

• viskoelastisite
• sonlu elemanlar yöntemi
• gevşeme modülü
• kolokasyon yöntemi
• histerezis

Viscoelastic Characterization and Mechanical Hystheresis of Commercial Grade Polypropylene

Öz

The main objective of this project is to investigate the viscoelastic behavior of polypropylene material. The theory of viscoelasticity is used to understand how a polypropylene material can be modeled mathematically to make a complete analysis. The time-dependent stress-strain response of the polypropylene material is investigated with the relaxation test that is carried out with the material. Then the required parameters for mathematical models such as elasticity or stiffness, k or E, along with the relaxation time, τ, is found to illustrate this behavior. The response curve from experiments is compared with the analytical study with the theory that includes the mathematical models to complete a finite element analysis on Marc. The curve that is achieved from this analysis overlapped with the one coming from the analytical study. Forced oscillation procedure is carried out in Marc to simulate the dynamic analysis test. Internal energy loss of the specimen is inspected via the hysteresis graph.

Anahtar Kelimeler

• viscoelasticity
• finite element method
• relaxation modulus
• collocation method
• hystheresis

Kaynakça

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