Tensile and Fatigue Behaviors of Two Thermoplastics Including Strain Rate, Temperature, and Mean Stress Effects

Fatemi, Ali; Mellot, Steve; Khosrovaneh, Abolhassan; Buehler, Charles J.

doi:10.4271/2014-01-0901

Cited by 7 publications

(7 citation statements)

References 11 publications

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“… Tensile curves showing the effect of temperature at displacement rate of 1 mm/min in the longitudinal direction of (a) PP and (b) PBT…”

Section: Resultsmentioning

confidence: 99%

“… Effect of temperature at R = 0.1 condition in the transverse direction of (a) PO and (b) PA6. Normalized fatigue data with tensile strength for (c) PO and (d) PA6…”

Section: Resultsmentioning

confidence: 99%

“… Effect of mean stress at 23 °C for (a) PO in the transverse direction and (b) PBT in the longitudinal direction…”

Section: Resultsmentioning

confidence: 99%

“… Correlations of fatigue data at 23 °C for R = –1, 0.1 and 0.3 conditions with the Walker equation for (a) PO in the transverse direction and (b) PBT in the longitudinal direction…”

Section: Resultsmentioning

confidence: 99%

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Tensile and fatigue behaviors of polymers for automotive applications

Mortazavian

Fatemi

2015

Materialwissenschaft Werkst

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An experimental study was conducted on tensile and fatigue behaviors of two unreinforced polymers and two short glass fiber reinforced polymer composites. A number of effects including anisotropy, strain rate and temperature on tensile behavior was investigated. Fatigue behavior was evaluated with respect to effects of mold flow direction, temperature, mean stress, and stress concentration. Effect of mold flow direction on both tensile and fatigue behaviors of unreinforced materials was found to be negligible, while it was significant for reinforced materials. Tsai-Hill criterion commonly used for continuous fiber composites was used to predict the offaxis fatigue strengths of short fiber reinforced materials. Effect of strain rate on tensile properties was found to be significant for all materials. Test temperature also influenced tensile and fatigue behaviors of both unreinforced and reinforced materials. Mathematical equations were developed to represent variations of tensile properties with both temperature and strain rate. Walker equation with a mean stress correction parameter is proposed to correct for the effect of mean stress. Effect of stress concentration combined with mold flow direction and mean stress was also investigated and Neuber's rule resulted in accurate estimation of fatigue life. Keywords: Tensile behavior / fatigue behavior / polymer fatigue / thermoplastic / short fiber composite Schlüsselwörter: Zähigkeitsverhalten / Ermüdungsverhalten / Polymerermüdung / thermoplastisch / Kurzfaser-Verbundwerkstoff Corresponding author: A. Fatemi, The University of Toledo,

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“… Tensile curves showing the effect of temperature at displacement rate of 1 mm/min in the longitudinal direction of (a) PP and (b) PBT…”

Section: Resultsmentioning

confidence: 99%

“… Effect of temperature at R = 0.1 condition in the transverse direction of (a) PO and (b) PA6. Normalized fatigue data with tensile strength for (c) PO and (d) PA6…”

Section: Resultsmentioning

confidence: 99%

“… Effect of mean stress at 23 °C for (a) PO in the transverse direction and (b) PBT in the longitudinal direction…”

Section: Resultsmentioning

confidence: 99%

“… Correlations of fatigue data at 23 °C for R = –1, 0.1 and 0.3 conditions with the Walker equation for (a) PO in the transverse direction and (b) PBT in the longitudinal direction…”

Section: Resultsmentioning

confidence: 99%

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Tensile and fatigue behaviors of polymers for automotive applications

Mortazavian

Fatemi

2015

Materialwissenschaft Werkst

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“…The flow stress data was extrapolated to higher strain rates at 25°C, and it was found that there is a power curve fit between the Zerilli Armstrong constants and the strain rate. As the strain rate increases, the tensile properties of HDPE increase (Brown et al, 2007;Drozdov & Christiansen, 2008;Fatemi et al, 2014;Milisavljević et al, 2012;Mortazavian & Fatemi, 2015). This is achieved using the power curve fit, as can be seen in figure 15.…”

Section: Figure 10 -Zerilli Armstrong Model Resultsmentioning

confidence: 99%

Finite Element Modelling and Optimization of Rotary Friction Welding Parameters of High-Density Polyethylene Pipes (HDPE). (c2022)

Gerges¹

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Rotary friction welding (RFW) is a highly efficient and sustainable process for joining both metals and plastics. The welding process parameters of RFW must be carefully selected to ensure a good quality weld with minimum energy consumption. Few studies in the literature simulate RFW of plastics and none aim to optimize the welding process parameters. This study aims to optimize the process parameters of the continuous drive rotary friction welding of high-density polyethylene (HDPE) pipes. To simulate the RFW process, a 2D axisymmetric fully coupled thermo-mechanical model was developed using DEFORM software package. The model used an elastic-plastic material behavior model that varies with temperature, strain, and strain rate, and a temperature-dependent coefficient of friction. The material behavior was modeled using a Zerilli Armstrong equation and the 2D model was validated against experimental data from the literature. The model successfully predicted the material behavior and captured the thermal and mechanical behavior of HDPE during the welding process. The model was then used to optimize the process parameters of the RFW of HDPE pipes using the Taguchi method. A linear regression model was used to estimate the response in terms of the input process parameters for a specific pipe geometry of 63 mm diameter and 5.8 mm thickness. The optimized process parameters that minimized the power consumption for the selected pipe were found to be 800 RPM rotational speed, 20mm/min feed rate and a friction time of 9 seconds. By relying upon these optimized parameters, industry professionals can produce high quality HDPE welds which would result in a reduction in welding operations cost, and a shift towards more sustainable manufacturing operations.

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On the strengthening effect of increasing cycling frequency on fatigue behavior of some polymers and their composites: Experiments and modeling

Eftekhari

Fatemi

2016

International Journal of Fatigue

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Tensile and Fatigue Behaviors of Two Thermoplastics Including Strain Rate, Temperature, and Mean Stress Effects

Cited by 7 publications

References 11 publications

Tensile and fatigue behaviors of polymers for automotive applications

Tensile and fatigue behaviors of polymers for automotive applications

Finite Element Modelling and Optimization of Rotary Friction Welding Parameters of High-Density Polyethylene Pipes (HDPE). (c2022)

On the strengthening effect of increasing cycling frequency on fatigue behavior of some polymers and their composites: Experiments and modeling

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