PSI - Issue 2_B

A. Ueno et al. / Procedia Structural Integrity 2 (2016) 2323–2329 Author name / Structural Integrity Procedia 00 (2016) 000–000

2324

2

electrolyte membrane was investigated.

Nomenclature E

elastic modulus dynamic hardness indentation depth tensile strength perforating force

Poisson’s ratio indentation force



DHT115

F max

v

viscosity elongation

h 



 B



degradation degree

f

D

2. Experimental procedure 2.1. Material and specimens

In this study, hydrocarbon thin films (thickness of 10  m), were used. After up to 24 h exposure in 120 o C hydrogen peroxide (H 2 O 2 ) gas chamber, tensile specimen was hollowed out from the hydrocarbon membrane as shown in Fig. 1. At present study, two types sample were used for hardness tests. One was a film embedded vertical in epoxy resin as shown in Fig. 2. The hardness on a cross-section of membrane were measured using this sample. The other one was small square sample hollowed out from membrane for measuring surface hardness of membrane.

Fig. 1 Shape and dimensions of tensile specimen (unit in mm). Fig. 2 Molded membrane for measuring cross section hardness.

2.2. Tensile Test Tensile tests were carried out by means of originally designed tensile testing machine having environmental chamber (Fig. 3). For avoiding a relaxation during tensile loading, rapid cross head speed of 1.0 mm/s was used. Young’s modulus E and Poisson's ratio  can be calculated by analyzing a dynamic image obtained by the means of a high-definition CCD camera.

Fig. 3 Newly designed tensile testing machine for membrane.