Holographic interferometry is applied to precursor films to determine their biaxial stresses. The theory of membrane deformation and vibrations is briefly reviewed to establish the relationship between stress and measured frequencies. Membranes for vibrational analysis are prepared using a circular precursor polymer. The biaxial stresses of the PHA, PAA, and 50/50 PHA/PAA are fairly constant with increasing frequencies: 6.85–7.61 MPa, 27.01–27.70 MPa, and 11.13–12.08 MPa, respectively. Regardless of the vibration modes, the biaxial stresses remain constant.
Посилання на статтю:
Polymer Communication Biaxial stress of precursor polymers using holographic interferometry / Jin-Hae Chang, Richard J. Farris // Polymer. – 1999. – N 40. – P. 4153–4156.