Failure Analysis of the Propylene Parts Used in Trucks

2020 ◽  
Vol 989 ◽  
pp. 22-27
Author(s):  
Gulgena D. Shakirova ◽  
Natalia V. Romanova ◽  
Lenar N. Shafigullin
Keyword(s):  
Thermal Degradation ◽  
Failure Analysis ◽  
Thermal Studies ◽  
Oxidative Degradation ◽  
Component Part ◽  
Thermal Oxidative Degradation ◽  
Lower Molecular Mass ◽  
Vehicle Component ◽  
Air Intake ◽  
Operating Temperatures

The paper provides the results of failure analysis of the air intake pipe in the truck compressor. The thermal studies were carried out to identify a material, and to analyze the thermal oxidative degradation caused by excessively high operating temperatures. The study of the vehicle component part showed that it was made from polypropylene block copolymer. Analysis of the thermo-physical properties of the warranty polypropylene part showed that the thermal degradation led to a higher polymer crystallization and, as a result, a lower molecular mass due to high temperatures. The results of the thermal studies showed that the polypropylene part was subjected to excessively high operating temperatures which caused the thermal degradation and, as a result, catastrophic failure of the material.

Kinetics of thermal degradation and thermal oxidative degradation of poly(p-dioxanone)

2003 ◽  
Vol 39 (8) ◽  
pp. 1567-1574 ◽  
Author(s):  
Ke-Ke Yang ◽  
Xiu-Li Wang ◽  
Yu-Zhong Wang ◽  
Bo Wu ◽  
Yong-Dong Jin ◽  
...  
Keyword(s):  
Thermal Degradation ◽  
Oxidative Degradation ◽  
Thermal Oxidative Degradation ◽  
Kinetics Of

Heat and Mass Transport From Thermally Degrading Thin Cellulosic Materials in a Microgravity Environment

1992 ◽  
Vol 114 (2) ◽  
pp. 494-502 ◽  
Author(s):  
G. Kushida ◽  
H. R. Baum ◽  
T. Kashiwagi ◽  
C. di Blasi
Keyword(s):  
Thermal Degradation ◽  
Gas Phase ◽  
Degradation Products ◽  
Oxidative Degradation ◽  
Slip Condition ◽  
Microgravity Environment ◽  
Material Surface ◽  
Thermal Oxidative Degradation ◽  
Oxidation Reactions ◽  
Cellulosic Materials

A theoretical model describing the behavior of a thermally thin cellulosic sheet heated by external thermal radiation in a quiescent microgravity environment is developed. This model describes thermal and oxidative degradation of the sheet and the heat and mass transfer of evolved degradation products from the heated cellulosic surface into the gas phase. At present, gas phase oxidation reactions are not included. Without buoyancy, the dominant vorticity creation mechanism in the bulk of the gas is absent except at the material surface by the requirement of the no-slip condition. The no-slip condition is relaxed, permitting the flow to be represented by a velocity potential. This approximation is permissible due to the combination of a microgravity environment and low Reynolds number associated with slow small-area heating by external radiation. Two calculations are carried out: heating without thermal degradation, and heating with thermal degradation of the sheet with endothermic pyrolysis, exothermic thermal oxidative degradation, and highly exothermic char oxidation. The results show that pyrolysis is the main degradation reaction. Moreover, self-sustained propagation of smoldering for cellulosic materials is very difficult due to the lack of sufficient oxygen supply in a quiescent environment.

Thermal-oxidative degradation of a styrene-butadienestyrene rubber graft copolymer

1968 ◽  
Vol 10 (11) ◽  
pp. 2870-2879 ◽  
Author(s):  
V.V. Rode ◽  
Yu.P. Novichenko ◽  
S.R. Rafikov
Keyword(s):  
Graft Copolymer ◽  
Oxidative Degradation ◽  
Thermal Oxidative Degradation

scholarly journals 3-Hydroxy-2-naphthoate Complexes of Transition Metals with Hydrazine - Preparation, Spectroscopic and Thermal Studies

2009 ◽  
Vol 6 (s1) ◽  
pp. S413-S421 ◽  
Author(s):  
N. Arunadevi ◽  
S. Vairam
Keyword(s):  
Thermal Degradation ◽  
Magnetic Moments ◽  
Thermal Studies ◽  
Analytical Data ◽  
Transition Metal Ions ◽  
Naphthoic Acid ◽  
Complexes Of Transition Metals ◽  
Xrd Patterns ◽  
Dta Studies ◽  
Nano Size

Reaction of hydrazine and 3-hydroxy-2-naphthoic acid with some transition metal ions forms two types of complexes: (i) [M(N2H4){C10H6(3-O)(2-COO)(H2O)2] where M=Ni, Co, Cd and Zn, at pH 9 and (ii) [M(N2H5)2{C10H6(3-O)(2-COO)}2].xH2O where M=Ni & x =1; M=Co, Cd, Mn & x=3; and M=Zn, Cu & x =0 at pH 4. Analytical data confirms the compositions of the complexes. The acid shows dianionic nature in these complexes. The magnetic moments and electronic spectra suggest the geometry of the complexes. IR data indicates the nature of hydrazine and presence of water in the complexes. Simultaneous TG-DTA studies shows different thermal degradation patterns for the two types of complexes. The first type shows formation of no stable intermediates whereas the second type shows the respective metal hydroxy naphthoate intermediates. The final products in both the types are found to be metal oxides of nano size. XRD patterns show isomorphism among the complexes with similar molecular formulae.

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