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Title: Pressure-sensitive ductile layers - I. Modeling the growth of extensive damage
Authors: Chew, H.B.
Guo, T.F. 
Cheng, L. 
Keywords: Discrete voids
Plastic dilatancy
Pressure-sensitive yielding
Void growth
Issue Date: Apr-2007
Source: Chew, H.B., Guo, T.F., Cheng, L. (2007-04). Pressure-sensitive ductile layers - I. Modeling the growth of extensive damage. International Journal of Solids and Structures 44 (7-8) : 2553-2570. ScholarBank@NUS Repository.
Abstract: Polymeric adhesives sandwiched between two elastic substrates are commonly found in multi-layers and IC packages. The non-elastic deformation and flow stress of such adhesive joints are highly pressure-sensitive. In this work, we study the effects of pressure-sensitivity, α, and plastic dilatancy, β, on void growth and coalescence ahead of a crack in ductile adhesive joints. To this end, a single layer of discrete voids is placed ahead of the crack in a pressure-sensitive dilatant adhesive sandwiched between two elastic substrates. The adhesive joint is subjected to small-scale yielding conditions. Using an associated flow rule (α = β), we show that pressure-sensitivity not only intensifies damage levels but also increases its spatial extent several fold. The damage level as well as its spatial extent is found to be even greater when a non-associated flow rule (β < α) is deployed. A reduction in the damage process zone's thickness further increases the voiding activity in the adhesive, thereby resulting in brittle-like failure. This work also examines the fracture toughness trends using a material failure criterion for crack growth. © 2006 Elsevier Ltd. All rights reserved.
Source Title: International Journal of Solids and Structures
ISSN: 00207683
DOI: 10.1016/j.ijsolstr.2006.08.005
Appears in Collections:Staff Publications

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