Interfacial toughness: dependence on surface roughness and test temperature

Reedy, Earl David; Stavig, Mark E.

doi:10.1007/s10704-019-00419-0

Interfacial toughness: dependence on surface roughness and test temperature

Journal Article · Thu Feb 06 04:00:00 EST 2020 · International Journal of Fracture

DOI:https://doi.org/10.1007/s10704-019-00419-0· OSTI ID:1697990

Reedy, Earl David ^[1]; Stavig, Mark E. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Interfacial toughness quantifies resistance to crack growth along an interface and in this investigation the toughness of an aluminum/epoxy interface was measured as a function of surface roughness and test temperature. The large strain response of the relatively ductile epoxy adhesive used in this study was also characterized. This epoxy adhesive exhibits intrinsic strain-softening after initial compressive yield and then deforms plastically at a roughly constant flow stress until it rapidly hardens at large compressive strains. Here, we find that interface toughness scales as the product of the temperature dependent epoxy yield strength and a length scale that characterizes surface roughness. The proposed scaling is based upon dimensional considerations of a model problem that assumes that the characteristic length scale of both the roughness and the crack-tip yield zone is small relative to the region dominated by the linear elastic asymptotic crack-tip stress field. Furthermore, the model assumes that interfacial failure occurs only after the epoxy begins to harden at large strains. The proposed relationship is validated by our interfacial toughness measurements.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1697990

Report Number(s):: SAND--2019-15226J; 682108

Journal Information:: International Journal of Fracture, Journal Name: International Journal of Fracture Vol. 222; ISSN 0376-9429

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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