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

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.

scholarly journals An approach to analysis of dynamic crack growth at bimaterial interface

2009 ◽  
Vol 36 (4) ◽  
pp. 299-327 ◽  
Author(s):  
R. Nikolic ◽  
Jelena Djokovic
Keyword(s):  
Asymptotic Analysis ◽  
Strain Field ◽  
Crack Tip ◽  
Optical Data ◽  
Bimaterial Interface ◽  
Dynamic Crack ◽  
New Approach ◽  
Shear Wave Speed ◽  
Propagating Crack

In this paper is presented the new approach to asymptotic analysis of the stress and strain fields around a crack tip that is propagating dynamically along a bimaterial interface. Through asymptotic analysis the problem is being reduced to solving the Riemann-Hilbert's problem, what yields the strain potential that is used for determination of the strain field around a crack tip. The considered field is that of a dynamically propagating crack with a speed that is between zero and shear wave speed of the less stiffer of the two materials, bound along the interface. Using the new approach in asymptotic analysis of the strain field around a tip of a dynamically propagating crack and possibilities offered by the Mathematica programming package, the results are obtained that are compared to both experimental and numerical results on the dynamic interfacial fracture known from the literature. This comparison showed that it is necessary to apply the complete expression obtained by asymptotic analysis of optical data and not only its first term as it was done in previous analyses.

Toughening of epoxy resin systems using core–shell rubber particles: a literature review

2021 ◽  
Author(s):  
Seyed Rasoul Mousavi ◽  
Sara Estaji ◽  
Mahsa Raouf Javidi ◽  
Azin Paydayesh ◽  
Hossein Ali Khonakdar ◽  
...  
Keyword(s):  
Literature Review ◽  
Epoxy Resin ◽  
Core Shell ◽  
Rubber Particles

An Alternative Decomposition of the Strain Gradient Tensor

2001 ◽  
Vol 69 (2) ◽  
pp. 139-141 ◽  
Author(s):  
H. Jiang ◽  
Y. Huang ◽  
T. F. Guo ◽  
K. C. Hwang
Keyword(s):  
Strain Gradient ◽  
Strain Field ◽  
Numerical Study ◽  
Volumetric Strain ◽  
Crack Tip ◽  
Square Root ◽  
Crack Tip Field ◽  
Gradient Tensor ◽  
Classical Plasticity ◽  
Square Root Singularity

An alternative decomposition of the strain gradient tensor is proposed in this paper in order to ensure that the deviatoric strain gradient vanishes for an arbitrary volumetric strain field, which is consistent with the physical picture of plastic deformation. The theory of mechanism-based strain gradient (MSG) plasticity is then modified accordingly based on this new decomposition. The numerical study of the crack-tip field based on the new theory shows that the crack tip in MSG plasticity has the square-root singularity, and the stress level is much higher than the HRR field in classical plasticity.

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