TY - GEN
T1 - Effect of surface treatment for metallicz-reinforcements on interlaminar fracture toughness of CFRP/CFRP joints
AU - Juergens, M.
AU - Kurtovic, A.
AU - Mertens, T.
AU - Nogueira, A. C.
AU - Lang, H.
AU - Kolb, M.
AU - Strobach, P.
AU - Hombergsmeier, E.
AU - Drechsler, K.
N1 - Publisher Copyright:
Copyright 2015. Used by the Society of the Advancement of Material and Process Engineering with permission.
PY - 2015
Y1 - 2015
N2 - The weight saving potential of carbon fiber reinforced polymers (CFRP) in primary aircraft structures is strongly determined by the applied joint design. Through-thickness reinforcements (z-reinforcements) are introduced to increase the delamination resistance of laminates and joints and thus improve their damage tolerance. In the present work, an innovative process is presented for a cost and time-efficient manufacture, with multidimensional metallic structures enhancing the joint's interlaminar fracture toughness. Spikes bent in the out-of-plane direction made of stainless steel and titanium were exposed to wet-chemical (HF/HNO3, Turco 5578®) and physical (pulsed laser irradiation; Nd:YVO4, 1064 nm) surface treatments to create micro-and nano-scaled oxide layer morphologies respectively. Mode I energy release rate is improved significantly through the introduction of pretreated reinforcements into a double cantilever beam (DCB) joint geometry. Laser irradiation shows a superior performance when compared to alkaline etched or baseline sandblasted spikes. Surface analyses through SEM and XPS were employed to further correlate fracture mechanical results to the oxide surface morphology, chemical composition and surface contaminations resulting from the applied co-bonding process. Reference joints featuring pretreated sheets without spikes in the bondline reveal similar results.
AB - The weight saving potential of carbon fiber reinforced polymers (CFRP) in primary aircraft structures is strongly determined by the applied joint design. Through-thickness reinforcements (z-reinforcements) are introduced to increase the delamination resistance of laminates and joints and thus improve their damage tolerance. In the present work, an innovative process is presented for a cost and time-efficient manufacture, with multidimensional metallic structures enhancing the joint's interlaminar fracture toughness. Spikes bent in the out-of-plane direction made of stainless steel and titanium were exposed to wet-chemical (HF/HNO3, Turco 5578®) and physical (pulsed laser irradiation; Nd:YVO4, 1064 nm) surface treatments to create micro-and nano-scaled oxide layer morphologies respectively. Mode I energy release rate is improved significantly through the introduction of pretreated reinforcements into a double cantilever beam (DCB) joint geometry. Laser irradiation shows a superior performance when compared to alkaline etched or baseline sandblasted spikes. Surface analyses through SEM and XPS were employed to further correlate fracture mechanical results to the oxide surface morphology, chemical composition and surface contaminations resulting from the applied co-bonding process. Reference joints featuring pretreated sheets without spikes in the bondline reveal similar results.
UR - http://www.scopus.com/inward/record.url?scp=84987660652&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84987660652
T3 - International SAMPE Technical Conference
BT - SAMPE Baltimore 2015 Conference and Exhibition
PB - Soc. for the Advancement of Material and Process Engineering
T2 - SAMPE Baltimore 2015 Conference and Exhibition
Y2 - 18 May 2015 through 21 May 2015
ER -