Elastomer biaxial characterization using bubble inflation technique. I: Experimental investigations

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<jats:title>Abstract</jats:title><jats:p>The biaxial rheological behavior of materials such as elastomers or polymers can be obtained using a bubble‐inflation‐technique. A circular membrane is clamped at the rim and expanded under gas pressure. The inflation of the circular membrane is recorded using a CCD video camera and the blowing pressure by a pressure sensor. Then, from elongation and curvature radius measurement at the pole of the bubble, one can deduce equibixial stress‐strain data. This study describes the optimization of a bubble‐inflation rheometer. The most sensitive point of the technique is the estimation of the elongation at the bubble pole, deduced from video camera measurements. A direct measurement of the bubble thickness was performed using a magnetic probe in order to validate rheometer results. Such a validation has evidently never been carried out before. Results of quasi‐static equibiaxial characterisation of elastomers are presented and analyzed.</jats:p>

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