Advances in Test Methods for Poisson’s Ratio of Solid Propellant

2014 ◽  
Vol 998-999 ◽  
pp. 397-400
Author(s):  
Xiao Zhang ◽  
Jian Zheng ◽  
Wei Peng ◽  
Zhi Xu Gu
Keyword(s):  
Viscoelastic Material ◽  
Calculation Method ◽  
Poisson’S Ratio ◽  
Solid Propellant ◽  
Test Methods ◽  
Poisson's Ratio ◽  
Foreign Study

This paper reviews domestic and foreign study result of the calculation method and variation of solid propellant and other viscoelastic material ratio of solid propellant, the viscoelastic material's Poisson's ratio as well as Poisson's ratio's influence on the structure performance of solid propellant.

scholarly journals Analysis of Sound Absorption Performance of Underwater Acoustic Coating considering Different Poisson’s Ratio Values

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Zhuhui Luo ◽  
Tao Li ◽  
Yuanwei Yan ◽  
Zhou Zhou
Keyword(s):  
Finite Element ◽  
Absorption Coefficient ◽  
Viscoelastic Material ◽  
Poisson’S Ratio ◽  
Sound Absorption ◽  
Absorption Peak ◽  
Poisson's Ratio ◽  
Element Analysis ◽  
Calculation Results ◽  
Absorption Performance

Viscoelastic material acoustic coating plays an important role in noise and vibration control of underwater equipment. The dynamic mechanical properties of the viscoelastic material have a direct effect on the sound absorption performance of the acoustic coating. The influence of Poisson’s ratio on sound absorption performance is studied. A finite element model was established to calculate the sound absorption performance of three typical acoustic coatings: homogeneous acoustic coatings, Alberich acoustic coatings, and trumpet cavity acoustic coatings, and the influence of Poisson’s ratio on the sound absorption performance of the three kinds of acoustic coatings was analyzed. The results show that when Poisson’s ratio varies from 0.49 to 0.4999, the larger Poisson’s ratio is, the larger the frequency of the first absorption peak is, the smaller the absorption coefficient below the frequency of the first absorption peak is, and the smaller the average absorption coefficient in the whole analysis frequency range is. The dynamic Poisson’s ratio with the change of frequency is obtained by interpolating the test results and static Poisson’s ratio finite element calculation results. The calculation results show that the dynamic Poisson’s ratio can get more accurate calculation results. This work can provide a reference for researchers to set Poisson’s ratio in theoretical analysis and finite element analysis of acoustic coating.

scholarly journals Using DMA to Simultaneously Acquire Young's Relaxation Modulus and Time-dependent Poisson's Ratio of a Viscoelastic Material

2014 ◽  
Vol 79 ◽  
pp. 153-159 ◽  
Author(s):  
Dao-Long Chen ◽  
Tz-Cheng Chiu ◽  
Tei-Chen Chen ◽  
Ming-Hua Chung ◽  
Ping-Feng Yang ◽  
...  
Keyword(s):  
Viscoelastic Material ◽  
Poisson’S Ratio ◽  
Relaxation Modulus ◽  
Time Dependent ◽  
Poisson's Ratio

scholarly journals Theoretical Calculation Method for the Hugoniot Elastic Limit of Hard Rock Based on Ideal Elastoplastic Model

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Yihao Cheng ◽  
Chunming Song ◽  
Yizhong Tan ◽  
Songlin Yue ◽  
Gan Li ◽  
...  
Keyword(s):  
Theoretical Calculation ◽  
Calculation Method ◽  
Poisson’S Ratio ◽  
Hard Rock ◽  
Strength Criterion ◽  
Poisson's Ratio ◽  
Dominant Factor ◽  
Plastic Limit ◽  
Plate Impact ◽  
Impact Experiments

To study the theoretical calculation method of the HEL for hard rock, the major factors determining the strength of rock under dynamic loadings are firstly discussed. Secondly, the calculation method of the HEL of hard rock is suggested based on the Lundborg strength criterion, and the parameters influencing the HEL are analyzed and discussed. Thirdly, the HEL obtained by theoretical calculation, numerical modeling, and experiments are compared. Fourthly, the abnormal decreasing or increasing of the HEL in plate impact experiments of hard rock is explained. This research shows that the HEL increases with Poisson’s ratio, the shear strength at zero pressure, the coefficient of internal friction and the plastic limit, and Poisson’s ratio and the plastic limit could be the most important factors. The simplified model of this work can give a rational and practical prediction of the HEL of hard rock in theory, and the complicated interaction between the “damage front” and the diffuse elastic precursor is assumed to explain two special effects of the HEL in plate impact experiments of hard rock, where Poisson’s ratio related to damage levels seems to be the dominant factor.

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