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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

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Front Chem Sci Eng    2013, Vol. 7 Issue (1) : 103-109    https://doi.org/10.1007/s11705-013-1315-8
RESEARCH ARTICLE
Tensile ratcheting behaviors of bronze powder filled polytetrafluoroethylene
Wenjuan XU, Hong GAO(), LiLan GAO, Xu CHEN, Yong WANG
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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Abstract

A series of tensile and ratcheting experiments for compacted polytetrafluoroethylene (PTFE) and bronze filled PTFE (PTFE/bronze) were conducted on dynamic mechanical analyzer (DMA-Q800). The effects of mean stress, stress amplitude and temperature on the ratcheting behaviors of PTFE and PTFE/bronze were investigated. It is found that the stress-strain response of PTFE/bronze is nonlinear and its elastic modulus is higher than that of pure PTFE. For uniaxial ratcheting test, the dissipation strain energy density (DSED) decreases rapidly in the first 10 cycles and approaches a constant after 20 cycles. The ratcheting strain and the DSED corresponding to 100 cycles increase with increasing mean stress, stress amplitude and temperature. Additionally, the DSED and ratcheting strain of PTFE/bronze are much lower than those of pure PTFE under the same experimental conditions. It is also found that both pure PTFE and PTFE/bronze present cyclic hardening characteristics. Above all, the addition of bronze can improve both the uniaxial tensile property and the cyclic property of PTFE.
Keywords bronze filled polytetrafluoroethylene (PTFE/bronze)      uniaxial tensile behavior      ratcheting behavior      dissipation strain energy density (DSED)     
Corresponding Author(s): GAO Hong,Email:hgao@tju.edu.cn   
Issue Date: 05 March 2013
 Cite this article:   
Wenjuan XU,Hong GAO,LiLan GAO, et al. Tensile ratcheting behaviors of bronze powder filled polytetrafluoroethylene[J]. Front Chem Sci Eng, 2013, 7(1): 103-109.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-013-1315-8
https://academic.hep.com.cn/fcse/EN/Y2013/V7/I1/103
SpecimensMean stressσm/MPaStress amplitude σa=Δσ/2(MPa)Filled or notTemperature /°C
S0131filledRT
S0232filledRT
S0333filledRT
S0422filledRT
S0542filledRT
S061.51.5filled30
S071.51.5filled80
S081.51.5filled120
S091.51.5filled150
S101.51.5filled200
PS0122notRT
PS0232notRT
PS0342notRT
PS0431notRT
PS0533notRT
PS061.51.5not30
PS071.51.5not80
PS081.51.5not120
PS091.51.5not150
PS101.51.5not200
Tab.1  Loading conditions of uniaxial ratcheting tests
Stress rate /(MPa?s–1)
0.10.52.5
Elastic modulus /GPaUltimate strength /MPa1.56610.011.64611.102.43212.75
Tab.2  Elastic modulus and ultimate strength of PTFE/bronze at different stress rates
Fig.1  Uniaxial tensile curves of PTFE/bronze and pure PTFE
Fig.1  Uniaxial tensile curves of PTFE/bronze and pure PTFE
Fig.2  Microscopic structures of PTFE/bronze (a,b) before stretching and (c,d) after stretching
Fig.2  Microscopic structures of PTFE/bronze (a,b) before stretching and (c,d) after stretching
Fig.3  Typical stress-strain response (stress rate= 0.5 MPa/s, = (2±2) MPa)
Fig.3  Typical stress-strain response (stress rate= 0.5 MPa/s, = (2±2) MPa)
Fig.4  The effect of mean stress on ratcheting strain
Fig.4  The effect of mean stress on ratcheting strain
Fig.5  The way to calculate DSED
Fig.5  The way to calculate DSED
Fig.6  The effect of mean stress on DSED
Fig.6  The effect of mean stress on DSED
Fig.7  The effect of stress amplitude on ratcheting strain
Fig.7  The effect of stress amplitude on ratcheting strain
Fig.8  The effect of stress amplitude on DSED
Fig.8  The effect of stress amplitude on DSED
Fig.9  The effect of temperature on ratcheting strain ( = 1.5±1.5 MPa, stress rate= 0.5 MPa/s)
Fig.9  The effect of temperature on ratcheting strain ( = 1.5±1.5 MPa, stress rate= 0.5 MPa/s)
Fig.10  The effect of temperature on DSED
Fig.10  The effect of temperature on DSED
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