scholarly journals Effect of Repetitive Impacts on the Mechanical Behavior of Glass Fiber-reinforced Polyurethane Foam

2019 ◽  
Vol 33 (1) ◽  
pp. 85-91
Author(s):  
Myung-Sung Kim ◽  
Jeong-Hyeon Kim ◽  
Seul-Kee Kim ◽  
Jae-Myung Lee
Keyword(s):  
Mechanical Behavior ◽  
Glass Fiber ◽  
Polyurethane Foam ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced

Mechanical behavior of glass fiber‐reinforced Nylon‐6 syntactic foams and its Young's modulus numerical study

2021 ◽  
Vol 138 (27) ◽  
pp. 50648 ◽  
Author(s):  
Roberto Yáñez‐Macías ◽  
Jorge E. Rivera‐Salinas ◽  
Silvia Solís‐Rosales ◽  
Daniel Orduña‐Altamirano ◽  
David Ruíz‐Mendoza ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Glass Fiber ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Numerical Study ◽  
Nylon 6 ◽  
Syntactic Foams ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced

Characterization of the Compressive Behavior of Glass Fiber Reinforced Polyurethane Foam at Different Strain Rates

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Huiyang Luo ◽  
Yanli Zhang ◽  
Bo Wang ◽  
Hongbing Lu
Keyword(s):  
Glass Fiber ◽  
Young’S Modulus ◽  
Polyurethane Foam ◽  
Master Curve ◽  
Young's Modulus ◽  
Superposition Principle ◽  
Strength Increase ◽  
Strain Rates ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced

A glass fiber reinforced polyurethane foam (R-PUF), used for thermal insulation of liquefied natural gas tanks, was characterized to determine its compressive strength, modulus, and relaxation behavior. Compressive tests were conducted at different strain rates, ranging from 10−3 s−1 to 10 s−1 using a servohydraulic material testing system, and from 40 s−1 to 103 s−1 using a long split Hopkinson pressure bar (SHPB) designed for materials with low mechanical impedance such as R-PUF. Results indicate that in general both Young’s modulus and collapse strength increase with the strain rate at both room and cryogenic (−170°C) temperatures. The R-PUF shows a linearly viscoelastic behavior prior to collapse. Based on time-temperature superposition principle, relaxation curves at several temperatures were shifted horizontally to determine Young’s relaxation master curve. The results show that Young’s relaxation modulus decreases with time. The relaxation master curve obtained can be used to convert to Young’s modulus at strain rates up to 103 s−1 following linearly viscoelastic analysis after the specimen size effect has been considered.

Numerical Prediction Method for Elasto-Viscoplastic Behavior of Glass Fiber Reinforced Polyurethane Foam Under Various Compressive Loads and Cryogenic Temperatures

2015 ◽  
Author(s):  
Chi-Seung Lee ◽  
Myung-Sung Kim ◽  
Kwang-Ho Choi ◽  
Myung-Hyun Kim ◽  
Jae-Myung Lee
Keyword(s):  
Constitutive Model ◽  
Strain Rate ◽  
Glass Fiber ◽  
Polyurethane Foam ◽  
Prediction Method ◽  
Nonlinear Behavior ◽  
Cryogenic Temperatures ◽  
Fiber Reinforced ◽  
Rate Dependent ◽  
Glass Fiber Reinforced

In the present study, the material characteristics of a glass fiber-reinforced polyurethane foam (RPUF) which is widely adopted to a liquefied natural gas (LNG) insulation system was investigated by a series of compressive tests under room and cryogenic temperatures. In addition, a temperature- and strain rate-dependent constitutive model was proposed to describe the material nonlinear behavior such as increase of yield stress and plateau according to temperature and strain rate variations. The elasto-viscoplastic model was transformed to an implicit form, and was implemented into the ABAQUS user-defined subroutine, namely, UMAT. Through a number of simulation using the developed subroutine, the various stress-strain relationships of RPUF were numerically predicted, and the material parameters associated with the constitutive model were identified. In order to validate the proposed method, the computational results were compared to a series of test of RPUF.

A temperature- and strain-rate-dependent isotropic elasto-viscoplastic model for glass-fiber-reinforced polyurethane foam

2015 ◽  
Vol 84 ◽  
pp. 163-172 ◽  
Author(s):  
Chi-Seung Lee ◽  
Myung-Sung Kim ◽  
Seong-Bo Park ◽  
Jeong-Hyeon Kim ◽  
Chang-Seon Bang ◽  
...  
Keyword(s):  
Strain Rate ◽  
Glass Fiber ◽  
Polyurethane Foam ◽  
Fiber Reinforced ◽  
Viscoplastic Model ◽  
Rate Dependent ◽  
Glass Fiber Reinforced
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