Abstract
In order to characterise materials using a simple and relative inexpensive method, the bubble inflation technique was modified.
A polymer plate is clamped between a Teflon coated heating plate and a heated cylinder. By applying air through the heating plate the polymer membrane deforms into the cylinder. The top position of the membrane is monitored by fibreoptic sensors positioned in the cylinder. The pressure difference across the membrane is measured as well.
The deformation in this inflation device is nonuniform and is only equal biaxial in the top of the deformed membrane. Due to this, the response is modelled using a finite element method in 3D Cartesian coordinates. The K-BKZ constitutive equation is used to model the nonlinear properties of the material. Using linear viscoelastic properties from oscillatory shear measurements and measurements of the bubble inflation, estimation of the strain dependence in the constitutive equation is possible.
A polymer plate is clamped between a Teflon coated heating plate and a heated cylinder. By applying air through the heating plate the polymer membrane deforms into the cylinder. The top position of the membrane is monitored by fibreoptic sensors positioned in the cylinder. The pressure difference across the membrane is measured as well.
The deformation in this inflation device is nonuniform and is only equal biaxial in the top of the deformed membrane. Due to this, the response is modelled using a finite element method in 3D Cartesian coordinates. The K-BKZ constitutive equation is used to model the nonlinear properties of the material. Using linear viscoelastic properties from oscillatory shear measurements and measurements of the bubble inflation, estimation of the strain dependence in the constitutive equation is possible.
Original language | English |
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Title of host publication | ANTEC '99: Plastics Bridging the Millennia, Conferance Proceedings : Materials |
Volume | 2 |
Place of Publication | Brookfield, Connecticut, USA |
Publisher | The Society of Plactic Engineers |
Publication date | 1999 |
Pages | 1906-1909 |
ISBN (Print) | 1-56676-804-7 |
Publication status | Published - 1999 |
Event | Annual Technical Conference of the SPE on Plastics Bridging the Millennia - New York (NY), United States Duration: 2 May 1999 → 6 May 1999 Conference number: 57 |
Conference
Conference | Annual Technical Conference of the SPE on Plastics Bridging the Millennia |
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Number | 57 |
Country/Territory | United States |
City | New York (NY) |
Period | 02/05/1999 → 06/05/1999 |