Using Frequency Sweep Test to Predict Creep and Recovery Response of Asphalt Binders

This paper presents an investigation of a novel linear-type piezoelectric ultrasonic actuator for application in a Smart Fuze Safety System (SFSS). Based on the requirements of SFSS, the structural parameters of the proposed piezoelectric ultrasonic actuator are determined by fuze arming mode. Moreover, sensitivity analysis of the structural parameters to the frequency consistency is conducted using FEM software, after which the optimal dimensions are obtained with two close natural vibration frequencies. To validate the results of FEM, the frequency sweep tests of the piezoelectric ultrasonic actuator are performed to determine the motor’s actual working mode frequencies with PSV-300-B Doppler laser vibrometer system. Furthermore, the results of frequency sweep test are compared with that of the finite element analysis, and further verified by impedance analyzer. To investigate the overall performance of the piezoelectric ultrasonic actuator, vibration modes of actuator’s stator, output speed and force of the piezoelectric ultrasonic actuator are tested. The experimental results show that the output speed and force of the actuator can reach 88.2 mm/s and 2.3N respectively, which means that piezoelectric ultrasonic actuator designed in this paper can meet the demands of the SFSS.

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Modeling of Repeated Creep and Recovery Experiments in Asphalt Binders

Transportation Research Record Journal of the Transportation Research Board ◽

10.3141/2126-08 ◽

2009 ◽

Vol 2126 (1) ◽

pp. 63-72 ◽

Cited By ~ 6

Author(s):

Mauricio Reyes ◽

Igor B. Kazatchkov ◽

Jiri Stastna ◽

Ludo Zanzotto

Keyword(s):

Asphalt Binders ◽

Creep And Recovery

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New approach for characterising the performance of asphalt binders through the multiple stress creep and recovery test

Road Materials and Pavement Design ◽

10.1080/14680629.2019.1595094 ◽

2019 ◽

Vol 20 (sup1) ◽

pp. S500-S520 ◽

Cited By ~ 5

Author(s):

Fernando Moreno-Navarro ◽

Raúl Tauste ◽

Miguel Sol-Sánchez ◽

M. Carmen Rubio-Gámez

Keyword(s):

Asphalt Binders ◽

New Approach ◽

Recovery Test ◽

Multiple Stress ◽

Creep And Recovery

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Effects of Stress Levels on Creep and Recovery Behavior of Modified Asphalt Binders with the Same Continuous Performance Grades

Transportation Research Record Journal of the Transportation Research Board ◽

10.3141/2505-03 ◽

2015 ◽

Vol 2505 (1) ◽

pp. 15-23 ◽

Cited By ~ 11

Author(s):

Mohammad Jafari ◽

Abbas Babazadeh ◽

Sassan Aflaki

Keyword(s):

Asphalt Binders ◽

Continuous Performance ◽

Modified Asphalt ◽

Creep And Recovery ◽

Recovery Behavior ◽

Stress Levels ◽

Effects Of Stress

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Non-Isothermal Crystallization and Viscoelastic Behavior of Polypropylene/Nanoclay Composites Fabricated from Masterbatch by Using a Mini Extruder

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.382.89 ◽

2018 ◽

Vol 382 ◽

pp. 89-93

Author(s):

Achmad Chafidz ◽

R.M. Faisal ◽

Mujtahid Kaavessina ◽

Dhoni Hartanto

Keyword(s):

Differential Scanning Calorimetry ◽

Isothermal Crystallization ◽

Viscoelastic Behavior ◽

Test Results ◽

Dsc Analysis ◽

Scanning Calorimetry ◽

Frequency Sweep ◽

Melt Compounding ◽

Frequency Sweep Test ◽

Scanning Electron

Polypropylene(PP)/nanoclay composites samples have been fabricated by melt compounding the PP pellets with nanoclay masterbatch (i.e. 50 wt% of nanoclay) using a mini extruder. The effect of three loadings of nanoclay (i.e. 5, 10, and 15 wt%) on the morphology, non-isothermal crystallization, and viscoelastic behavior of the PP/nanoclay composites were investigated. All the nanocomposites samples were characterized by using Scanning Electron Microscope (SEM), Differential Scanning Calorimetry (DSC), and an oscillatory rheometer. The SEM results showed that the distribution of nanoclay in the PP was relatively good at all level of loadings. The DSC analysis results showed that the nanoclay has dramatically enhanced the crystallization temperature, from 117°C (for neat PP) to 127-129°C (for nanocomposites). Additionally, the frequency sweep test results exhibited that the presence of nanoclay increased the viscoelastic behavior of the PP matrix.

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