The adhesive fracture energy,
, of adhesive joints may be readily ascertained from linear-elastic fracture-mechanics (LEFM) methods, and indeed a British Standard (BS7991-2001) now exists for the LEFM Mode I value,
, largely as a result of the efforts of the European Structural Integrity Society (ESIS) TC4 Committee, as described by Blackman and Kinloch [
]. Notwithstanding, the LEFM test specimens are relatively complex and expensive to make and test, and many industries would far prefer to deduce the value of
from the very common and widely used ‘peel test’.