Damage Zone Around Tip of an Interface Crack Between Rubber-Modified Epoxy Resin and Aluminum

2002 ◽  
Vol 124 (2) ◽  
pp. 206-214 ◽  
Author(s):  
Deok-Bo Lee ◽  
Toru Ikeda ◽  
Noriyuki Miyazaki ◽  
Nak-Sam Choi
Keyword(s):  
Residual Stress ◽  
Epoxy Resin ◽  
Interface Crack ◽  
Significant Influence ◽  
Fracture Behavior ◽  
Structural Integrity ◽  
Damage Zone ◽  
Crack Tip ◽  
Rubber Particles ◽  
Modified Epoxy

The fracture behavior of an interface crack tip has significant influence on the structural integrity of an adhesive joint. We investigate a damage zone and the deformation of rubber particles around a tip of an interface crack between rubber-modified epoxy resin and aluminum. They are compared with those around a crack tip in homogeneous rubber-modified epoxy resin. Cavitations in rubber particles are observed around a damaged crack tip in homogeneous resin but not around a damaged interface crack tip. Rubber particles around an interface crack tip are deformed ellipsoidally due to the residual stress even before being damaged, and interfaces between rubber particles and epoxy resin around an interface crack tip are debonded after being damaged.

Damage zone around crack tip and fracture toughness of rubber-modified epoxy resin under mixed-mode conditions

2002 ◽  
Vol 69 (12) ◽  
pp. 1363-1375 ◽  
Author(s):  
Deok-Bo Lee ◽  
Toru Ikeda ◽  
Noriyuki Miyazaki ◽  
Nak-Sam Choi
Keyword(s):  
Fracture Toughness ◽  
Epoxy Resin ◽  
Mixed Mode ◽  
Damage Zone ◽  
Crack Tip ◽  
Modified Epoxy

Failure Analysis on Rubber-Modified Epoxy Resin under Various Loading Speed Conditions

2005 ◽  
Vol 297-300 ◽  
pp. 1907-1912 ◽  
Author(s):  
Deok Bo Lee ◽  
Joo Hyung Kim
Keyword(s):  
Fracture Toughness ◽  
Composite Material ◽  
Epoxy Resin ◽  
Structural Reliability ◽  
Fiber Composite ◽  
Damage Zone ◽  
Crack Tip ◽  
Rubber Content ◽  
The Matrix ◽  
Modified Epoxy

A rubber-modified epoxy resin is widely used as adhesive and matrix materials for fiber composite material. The structural reliability of composite material depends on the fracture toughness of the matrix resin. In this study, the fracture toughness and the damage zone around a crack tip in rubber-modified epoxy resin were investigated. The volume fractures of rubber (CTBN1300×8) in the rubber-modified epoxy resin were 0%, 5% and 15% under several loading speeds. The fracture toughness(KIC) and the fracture energy(GIC) were measured by using 3-point bending specimens. The 4-point bending specimens were also used to observe damage zones at the vicinity of a crack tip in modified resins. The results show that the values of the fracture toughness and the sizes of damage zones at 5% and 15% rubber content decrease with increase in loading speed.

Stress around a Crack Tip in Rubber-Modified Epoxy Resin (Effect of Bond Thickness on Fracture Toughness)

2000 ◽  
Vol 2000.13 (0) ◽  
pp. 349-350
Author(s):  
Daisuke IKEMOTO ◽  
Deok bo LEE ◽  
Toru IKEDA ◽  
Noriyuki MIYAZAKI
Keyword(s):  
Fracture Toughness ◽  
Epoxy Resin ◽  
Crack Tip ◽  
Modified Epoxy

723 Measurement of the Strain Field around a Crack Tip in Epoxy Resin modified with Submicron-Rubber-Particles

2007 ◽  
Vol 2007 (0) ◽  
pp. 552-553
Author(s):  
Masahiro UEDA ◽  
Nobuyuki SHISHIDO ◽  
Toru IKEDA ◽  
Noriyuki MIYAZAKI
Keyword(s):  
Epoxy Resin ◽  
Strain Field ◽  
Crack Tip ◽  
Rubber Particles

Effect of Bond Thickness on the Fracture Toughness of Adhesive Joints

2004 ◽  
Vol 126 (1) ◽  
pp. 14-18 ◽  
Author(s):  
Deok-Bo Lee ◽  
Toru Ikeda ◽  
Noriyuki Miyazaki ◽  
Nak-Sam Choi
Keyword(s):  
Fracture Toughness ◽  
Adhesive Joint ◽  
Damage Zone ◽  
Crack Tip ◽  
Adhesive Layer ◽  
Compact Tension ◽  
Optical Microscope ◽  
Adhesive Joints ◽  
Adhesive Layers ◽  
Modified Epoxy

The effect of bond thickness on the fracture toughness of adhesive joints was investigated from a microstructural perspective, using compact tension (CT) adhesive-joint specimens with different bond thicknesses. The adhesive material was a rubber-modified epoxy resin with 12.5 wt% carboxy-terminated butadiene acrylonitrile (CTBN) elastomer. The shapes of the rubber particles dispersed in adhesive layers of damaged and undamaged specimens were observed with an optical microscope. The damage was distributed along the interfaces between the adhesive layer and the two adherends. The results show that the primary causes of variations in the fracture toughness of an adhesive joint with the bond thickness are not only a damage zone around a crack tip but also the combination of a damage zone around a crack tip and additional damage zones along the interfaces.

scholarly journals Microscopic and Mesoscopic Evaluations of Materials. The Mechanism of Damage around Crack Tip in Rubber-Modified Epoxy Resin.

1999 ◽  
Vol 65 (631) ◽  
pp. 439-446 ◽  
Author(s):  
Deokbo LEE ◽  
Toru IKEDA ◽  
Mitsugu TODO ◽  
Noriyuki MIYAZAKI ◽  
Kiyoshi TAKAHASHI
Keyword(s):  
Epoxy Resin ◽  
Crack Tip ◽  
Modified Epoxy
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