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Plasticity in peeling
Author(s) -
Duke A. J.
Publication year - 1974
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1974.070181013
Subject(s) - adhesive , materials science , composite material , yield (engineering) , plasticity , slip (aerodynamics) , bending , bending moment , moment (physics) , extensibility , plastic bending , joint (building) , structural engineering , thermodynamics , classical mechanics , physics , bending stiffness , computer science , layer (electronics) , engineering , operating system
Contrary to classical theory, a high proportion of bond failures by peeling involve progressive plastic adherend flexural yield. Such yield occurs with adherend thicknesses below a critical value, T c , which is shown calculable by combining elastic peel mechanics with plastic bending criteria. The geometry of such “peel with yield,” and thence the moment‐controlled peel forces, can be accounted for only if the adhesive is also recognized as behaving essentially plastically. Subsequent plastic adherend un bending is important with highly extensible adhesives. The geometry of “legging” peel in such cases is best described by fully plastic mechanics. These are derived and shown to account for literature data on dependencies of peel force upon peel rate and adhesive thickness. “Stick‐slip” peel phenomena are indicated to be controlled by recurring interacting plastic–elastic transitions, in both adhesive and adherend: adhesive strain rate is critical in such phenomena. Four regimes of peel behavior can therefore apply as adherend thickness ( T ) increases, with peel forces proportional respectively to T 0 , T 2/3 , T 3/2 (above T c ) and finally controlled by moment limitations due to joint configurational constraints (“cleavage”).