Experimental investigation of temperature field, defects, and mechanical strength in dissimilar laser bonding of Ti6Al4V and polyethylene terephthalate

2021 ◽  
Vol 33 (1) ◽  
pp. 012038
Author(s):  
Junyao Xue ◽  
Mohammad Hossein Razavi Dehkordi ◽  
Ali Abdelahi ◽  
Adel Abdelahi ◽  
Ehsan Rasti ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Temperature Field ◽  
Mechanical Strength ◽  
Polyethylene Terephthalate ◽  
Laser Bonding ◽  
Field Defects

Experimental Investigation of Mechanical Strength and Temperature of Friction Stir Welded Joint

2019 ◽  
pp. 631-639
Author(s):  
Jitender Kundu ◽  
Siddhartha Kosti ◽  
Mandeep Kumar ◽  
Nav Rattan ◽  
Gyander Ghangas ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Mechanical Strength ◽  
Welded Joint ◽  
Friction Stir

scholarly journals Structural and Mechanical Strength of Proton Radiation Processed Polyethylene Terephthalate

2020 ◽  
Vol 12 (1) ◽  
pp. 83-91
Author(s):  
M. Sahoo ◽  
B. Mallick ◽  
S. Rout ◽  
G. N. Dash
Keyword(s):  
Mechanical Strength ◽  
Polyethylene Terephthalate ◽  
Fibre Axis ◽  
Diffraction Spectrum ◽  
Proton Radiation ◽  
Radiation Processing ◽  
X Ray ◽  
Mesophase Formation ◽  
Extra Peak ◽  
Radiation Induced

The change in structural and mechanical behavior of polyethylene terephthalate (PET) due to 2.4 MeV proton has been studied. Radiation processing of PET polymer is carried out using different low doses such as 0.2, 2.0, and 20 kGy. The Physics of microstrain and radiation-induced mesophase formation are analysed. X-ray investigation indicates that  proton-induced structural modification takes place in the material. Apart from usual diffraction peaks, a low intensity broad peak is observed at small angle of about 2q =10º, when the fibre axis is mounted parallel to the X-ray direction. Such peak is absent in the diffraction spectrum when the fibre axis is mounted perpendicular to the beam direction. The appearance of the extra peak in a particular orientation confirms that, the phase is 2-dimensionally oriented (mesophase). The Young’s modulus (Y) of this irradiated PET sample is found to be more than that of the virgin sample with the highest value recorded for a dose of 2.0 kGy. The decrease in Y for higher dose (20 kGy) may be due to enhanced ion-induced microstrain in the sample, causing degradation in mechanical strength.

Effect of the ageing on the dissipative properties of getinacks subjected to repeated static loading

2014 ◽  
Vol 11 (6) ◽  
pp. 589-596
Author(s):  
Valesyan Shant
Keyword(s):  
Experimental Data ◽  
Experimental Investigation ◽  
Temperature Field ◽  
Energy Dissipation ◽  
Hysteresis Loop ◽  
Static Loading ◽  
Applied Load ◽  
Effect Of Temperature ◽  
Loading And Unloading

The effect of ageing on the dissipative properties of getinacks subjected to repeated static loading has been investigated. Specimens were tested at the age of 1, 4, and 8 years. The approximation of experimental data is done, and the energy of dissipation is calculated. Based on the investigation of getinacks manufactured by the technology of regulated thermo-pressing, this technology can be recommended for the manufacturing of appropriate products.The results of experimental investigation of the effect of temperature field on the dissipative properties of layered getinacks widely applicable in electrical manufacturing, electronics and microelectronics are considered in this paper. The approximation of the experimentally obtained dependences between σ and ε for the loading (→) and unloading (←) parts of the hysteresis loop are calculated and plotted. The factor of energy dissipation is defined. Estimated that the temperature field affects the dissipative properties of the layered getinacks and that effect is depending on the value of applied load cyclically acting on the material.

scholarly journals Temperature Field-Assisted Ultraviolet Nanosecond Pulse Laser Processing of Polyethylene Terephthalate (PET) Film

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1356
Author(s):  
Jun Xu ◽  
Youmin Rong ◽  
Weinan Liu ◽  
Tian Zhang ◽  
Guoqiang Xin ◽  
...  
Keyword(s):  
Temperature Field ◽  
Ambient Temperature ◽  
Thermal Effect ◽  
Polyethylene Terephthalate ◽  
Pulse Laser ◽  
Polymer Films ◽  
Laser Processing ◽  
Polymer Chains ◽  
Ambient Gases ◽  
Pet Film

Understanding the mechanism of and how to improve the laser processing of polymer films have been important issues since the advent of the procedure. Due to the important role of a photothermal mechanism in the laser ablation of polymer films, especially in transparent polymer films, it is both important and effective to adjust the evolution of heat and temperature in time and space during laser processing by simply adjusting the ambient environment so as to improve and understand the mechanism of this procedure. In this work, studies on the pyrolysis of PET film and on temperature field-assisted ultraviolet nanosecond (UV-ns) pulse laser processing of polyethylene terephthalate (PET) film were performed to investigate the photothermal ablation mechanism and the effects of temperature on laser processing. The results showed that the UV-ns laser processing of PET film was dominated by the photothermal process, in which PET polymer chains decomposed, melted, recomposed and reacted with the ambient gases. The ambient temperature changed the heat transfer and temperature distribution in the laser processing. Low ambient temperature reduced the thermal effect and an increase in ambient temperature improved its efficiency (kerf width: 39.63 μm at −25 °C; 48.30 μm at 0 °C; 45.81 μm at 25 °C; 100.70 μm at 100 °C) but exacerbated the thermal effect.

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