scholarly journals Visualization and quantification of the stress distribution on epoxy resin through photoelasticity and infrared radiation techniques

AIP Advances ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 015312
Author(s):  
Lu Chen ◽  
Mingyuan Zhang ◽  
Dejian Li ◽  
Yingjun Li
Keyword(s):  
Stress Distribution ◽  
Epoxy Resin ◽  
Infrared Radiation

Dynamic and Static Fracture Toughness of Al/Epoxy Resin Interface

2019 ◽  
Author(s):  
Yusaku Saito ◽  
Kosuke Sudo ◽  
Kohei Kanamori ◽  
Akio Yonezu
Keyword(s):  
Fracture Toughness ◽  
Stress Distribution ◽  
Tensile Test ◽  
Epoxy Resin ◽  
Laser Irradiation ◽  
Interfacial Fracture ◽  
Initial Crack ◽  
Al Alloy ◽  
Interfacial Fracture Toughness ◽  
Static Fracture

Abstract This study evaluates the interfacial fracture strength and toughness of an epoxy resin/aluminum alloy based on two different tests of impact loading and quasi-static loading. In the impact test, we carried out the Laser Shock Adhesion Test (LaSAT). This method uses a strong ultrasonic wave induced by pulsed laser irradiation to induce interfacial fracture. Due to the grease layer ablation caused by laser irradiation, strong elastic wave generates and propagates. The tensile stress acts on the Al/epoxy resin interface, inducing an interfacial delamination. This delamination is further extended by an additional laser irradiation in order to evaluate the interfacial fracture toughness. By simulating the experimental delamination progression in FEM (Finite Element Method), we evaluated the dynamic fracture toughness of the Al alloy/epoxy resin interface. On the other hand, a quasi-static test for the toughness evaluation was conducted using a uniaxial tensile test. Before the tensile test, we produced an initial crack (initial delamination) at the interface by using laser ablation. Subsequently, this sample having initial crack is loaded by uniaxial tension. It is found that the interfacial crack progresses, resulting in unstable interfacial fracture. Furthermore, we conducted FEM simulation, in order to estimate the stress distribution near the delamination. By deriving a stress intensity factor from the stress distribution, we evaluated the quasi-static fracture toughness. To compare the dynamic and quasi-static fracture toughness of Al alloy/epoxy resin interface, we clarified the loading rate dependency of interfacial fracture toughness.

Photoelastic and numerical analyses of the stress distribution around a fiber in a pull-out test for a thermoplastic fiber/epoxy resin composite

2017 ◽  
Vol 39 (S4) ◽  
pp. E2397-E2406 ◽  
Author(s):  
J.M. Vázquez-Rodríguez ◽  
E.A. Flores-Johnson ◽  
P.J. Herrera-Franco ◽  
P.I. Gonzalez-Chi
Keyword(s):  
Stress Distribution ◽  
Epoxy Resin ◽  
Resin Composite ◽  
Numerical Analyses ◽  
Pull Out ◽  
Epoxy Resin Composite

Raman imaging of residual stress distribution in epoxy resin and metal interface

2019 ◽  
Vol 51 (1) ◽  
pp. 193-200
Author(s):  
Katsutoshi Abiko ◽  
Yuichi Kato ◽  
Hiroshi Hohjo ◽  
Yoshihiro Kishida ◽  
Eiichi Sudo
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Epoxy Resin ◽  
Residual Stress Distribution ◽  
Raman Imaging ◽  
Metal Interface

Electromechanical Analysis of Piezoelectric Harvesting Unit from Road Vibration with FEA

2013 ◽  
Vol 726-731 ◽  
pp. 3144-3147 ◽  
Author(s):  
Chun Hua Sun ◽  
Yong Kang Zhang ◽  
Jian Hong Du ◽  
Guang Qing Shang
Keyword(s):  
Stress Distribution ◽  
Epoxy Resin ◽  
Maximum Stress ◽  
Open Circuit Voltage ◽  
Asphalt Pavement ◽  
Open Circuit ◽  
Electromechanical Properties ◽  
Tire Pressure

The purpose of this paper is to analyze the electromechanical properties of piezoelectric harvesting unit from road vibration. A new kind of piezoelectric harvesting unit, which consists of 8 pieces of PZT vibrators and sizes of 280*280*20mm, is purposed. The vibrators are connected and covered by epoxy resin. With the software of ANSYS, open circuit voltage and stress distribution of the unit under the function of vehicle tire pressure are analyzed. The results show that the maximums of open circuit voltage and stress distribution are proportional with the tire pressure. When the tire pressure is 1.0MPa, open circuit voltage and the maximum stress generated by the piezoelectric unit are 950.8V and 9.8MPa, respectively. It means that application of the piezoelectric harvesting unit can couple with the asphalt pavement very well and harvest higher electricity from road vibration on larger area.

scholarly journals Effect of Far-infrared Radiation on Thermal Cationic Polymerization of Epoxy Resin

2004 ◽  
Vol 124 (11) ◽  
pp. 1047-1052
Author(s):  
Shin Kiyokawa ◽  
Yasumasa Morita ◽  
Haruo Inoue ◽  
Haruo Hirose ◽  
Noboru Morita ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Infrared Radiation ◽  
Cationic Polymerization ◽  
Far Infrared ◽  
Far Infrared Radiation

End reinforcement and grips for anisotropic tubes

1982 ◽  
Vol 17 (1) ◽  
pp. 31-43 ◽  
Author(s):  
J Highton ◽  
P D W Soden
Keyword(s):  
Stress Distribution ◽  
Internal Pressure ◽  
Epoxy Resin ◽  
Glass Fibre ◽  
Axial Load ◽  
Filament Wound ◽  
Glass Fibre Reinforced ◽  
Thin Walled ◽  
Orthotropic Shells ◽  
Theoretical Results

A method of gripping and reinforcing the ends of anisotropic tubes for testing under combined axial load and internal pressure is analysed. Edge solutions for long, cylindrical, specially orthotropic shells are considered. The tube, reinforcement, and grips are then modelled as an assembly of short, parallel, multilayered, thin-walled, orthotropic shells. Theoretical results are presented for the stress distribution in a ± 75 degree filament-wound E glass/epoxy resin tube with circumferentially wound glass fibre reinforced ends.

Shrinkage stresses in three-dimensional two-phase systems

1973 ◽  
Vol 8 (4) ◽  
pp. 286-293 ◽  
Author(s):  
P S Theocaris ◽  
S A Paipetis
Keyword(s):  
Stress Distribution ◽  
Epoxy Resin ◽  
Three Dimensional ◽  
Composite Model ◽  
Stress Fields ◽  
Two Phase ◽  
Spherical Inclusions ◽  
Single Inclusion ◽  
Phase Systems ◽  
Matrix Modulus

Stress fields, due to polymerization shrinkage of a matrix cast around a three-dimensional array of closely packed inclusions, were studied photoelastically. The composite model consisted of a group of spherical inclusions, made of unplasticized hot-setting epoxy resin and forming a body-centred cubic arrangement, around which a plasticized matrix was cast, so that control over the ratio of matrix modulus to inclusion modulus was possible. A theoretical approximation to the problem of stress distribution around a single inclusion was also attempted and subsequently found to be in fair agreement with experimental results. With closely packed inclusions the stress distribution was studied for different degrees of packing and matrix plastification. From these studies further conclusions can be drawn, confirming the validity of the qualitative results stated for a single inclusion.

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