Rj. Farris et Jl. Goldfarb, AN EXPERIMENTAL PARTITIONING OF THE MECHANICAL ENERGY EXPENDED DURINGPEEL TESTING, Journal of adhesion science and technology, 7(8), 1993, pp. 853-868
Peeling of polyimide coatings bonded to aluminum substrates was analyz
ed from a thermodynamic perspective with the intent of determining how
the energy expended in separating the bonded materials is consumed. T
he mechanical work expended and the heat dissipated during peeling wer
e simultaneously measured using deformation calorimetry. The surfaces
exposed by peeling were analyzed by electron microscopy and electron s
pectroscopy. The thermodynamics of tensile drawing for polyimide were
studied using deformation calorimetry and thermomechanical analysis. W
hen polyimide coatings were peeled from aluminum substrates at a peel
angle of 180-degrees, almost all of the mechanical energy was consumed
in propagating the bend through the coating being peeled. The fractio
n of peel energy dissipated as heat was 48 +/- 1.3% and nearly all of
the remainder was stored as latent internal energy in the peeled polyi
mide. When the bend is propagated through aluminum, which has a limite
d capacity to store latent internal energy, 97-100% of the mechanical
energy is dissipated as heat.