TY - GEN
T1 - Seminal developments in the durability and damage tolerance assessment of bonded joints
AU - Jones, Rhys
AU - Kinloch, Anthony J.
AU - Michopoulos, J.
AU - Iliopoulos, A. P.
N1 - Funding Information:
Rhys Jones acknowledges support via an Office of Naval Research (ONR) NICOP Grant N62909-19-1-2011-P00001. John Michopoulos and Athanasios Iliopoulos acknowledge support for this work by the Office of Naval Research (ONR) through the Naval Research Laboratory’s core funding.
Publisher Copyright:
© 36th Technical Conference of the American Society for Composites 2021: Composites Ingenuity Taking on Challenges in Environment-Energy-Economy, ASC 2021.
PY - 2021
Y1 - 2021
N2 - Structural adhesives are widely used for joining composite components in many industries and crack growth in such materials is far more likely to occur when they are subjected to repeated cyclic loading than to monotonic loading. Whilst the Hartman-Schijve equation for fatigue crack growth (FCG) has been shown to hold for cohesive crack growth in adhesives under Mode I, Mode II and Mixed-Mode I/II loading, little attention has been paid to its ability to capture the effects of the thickness of the adhesive layer. The present paper examines the growth of fatigue cracks, that occurs cohesively through the adhesive layer, in two toughened epoxy adhesives typical of those used in the automotive and the aerospace industries. Firstly, it is established that when the crack growth rate, da/dN, curves are expressed as a function of Δ√G, or ΔG, where G is the energy release-rate, then the crack growth curves are a function of the thickness of the adhesive layer. It is then shown that this dependency vanishes when da/dN is expressed as a function of the crack-driving force, Δκ, as defined by the Hartman-Schijve equation. Therefore, it is suggested that the parameter Δκ appears to be a valid similitude parameter.
AB - Structural adhesives are widely used for joining composite components in many industries and crack growth in such materials is far more likely to occur when they are subjected to repeated cyclic loading than to monotonic loading. Whilst the Hartman-Schijve equation for fatigue crack growth (FCG) has been shown to hold for cohesive crack growth in adhesives under Mode I, Mode II and Mixed-Mode I/II loading, little attention has been paid to its ability to capture the effects of the thickness of the adhesive layer. The present paper examines the growth of fatigue cracks, that occurs cohesively through the adhesive layer, in two toughened epoxy adhesives typical of those used in the automotive and the aerospace industries. Firstly, it is established that when the crack growth rate, da/dN, curves are expressed as a function of Δ√G, or ΔG, where G is the energy release-rate, then the crack growth curves are a function of the thickness of the adhesive layer. It is then shown that this dependency vanishes when da/dN is expressed as a function of the crack-driving force, Δκ, as defined by the Hartman-Schijve equation. Therefore, it is suggested that the parameter Δκ appears to be a valid similitude parameter.
UR - http://www.scopus.com/inward/record.url?scp=85120493280&partnerID=8YFLogxK
M3 - Conference Paper
AN - SCOPUS:85120493280
T3 - 36th Technical Conference of the American Society for Composites 2021: Composites Ingenuity Taking on Challenges in Environment-Energy-Economy, ASC 2021
SP - 1734
EP - 1743
BT - 36th Technical Conference of the American Society for Composites 2021
A2 - Ochoa, Ozden
PB - DEStech Publications, Inc
T2 - 36th Technical Conference of the American Society for Composites 2021
Y2 - 20 September 2021 through 22 September 2021
ER -