Poisson Ratio Effect on Stress Behavior of Propellant Grains Under Ignition Loading

Chu, Hung Ta; Chou, Jung-Hua

doi:10.2514/1.50249

Cited by 18 publications

(10 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Structure integrity as well as the physical response of different designs will be evaluated by the numerical simulation during the design stage to reduce the cost of production. Poisson's ratio of solid propellant is one of the main input parameters which will strongly affect the structural response, especially during the ignition period [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Viscoelastic Poisson’s Ratio of Composite Materials considering the Effects of Dewetting

Cui

Wei-li

Lv³

et al. 2022

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

A direct numerical method is introduced herein to investigate time-dependent Poisson’s ratio of solid propellant based on a representative volume element (RVE) model. Time-dependent longitudinal and transverse strains are considered in the calculation of time-dependent Poisson’s ratio under the relaxation test. The molecular dynamics (MD) packing algorithm is used to generate the high area fraction RVE model of solid propellants consisting of ammonium perchlorate (AP) particles whose radius follows lognormal distribution. In order to simulate the dewetting response of the interface between particles and matrix, the PPR model is modified and utilized during the analysis. Time-dependent Poisson’s ratio is measured under different cohesive parameters, loading conditions (loading temperature, loading rate, and fixed strain), and area fraction. Numerical results reveal that time-dependent Poisson’s ratio can be nonmonotonic or monotonic according to the different cohesive parameters. A concept of critical cohesive parameters is proposed to judge whether the monotonic property of time-dependent Poisson’s ratio appears or not. According to the numerical analysis, the cohesive contact and the shrinkage of the bulk element are two main factors which will control the change of monotonic property. All time-dependent Poisson’s ratios will increase at the beginning of the relaxation stage because the effects of cohesive contact can be ignored compared with the large shrinkage of the bulk element. However, with the increased shrinkage of the bulk element, the increased cohesive contact will defend further shrinkage at the same time. Although the shrink of the bulk element never changes its direction, the ratio of the transverse strain to longitudinal strain may decrease or keep increasing in this stage. When transverse and longitudinal strains stop to change, all time-dependent Poisson’s ratios will achieve their equilibrium values.

show abstract

Section: Introductionmentioning

confidence: 99%

Investigation on Viscoelastic Poisson’s Ratio of Composite Materials considering the Effects of Dewetting

Cui

Wei-li

Lv³

et al. 2022

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

show abstract

“…A4 141 pixels subset size and a5pixelsg rid step were chosen as calculation parameters for the DIC analysis, and the displacement fields of ROI and ROC were analyzed using the efficient and accurateI C-GN algorithm with first-order shapef unctions [ 21].A s noted previously,t he displacement components of ROC were first used to estimatet he eleven unknown parameters (i.e., a 0, 1, …,4 , b 0, 1, …,4 ,a nd k 1 )u sing Equation (1). Based on these determinedp arameters, the displacement fields of ROI were corrected point by point according to Equation (2). Finally,t hese corrected discrete displacement data of ROI wereu sed to computec orrected strains using PLS algorithm with as train calculation window of 21 21s ets of displacement data (corresponds to av irtual strain gage with as ize of 101 101 pixels).…”

Section: Methodsmentioning

confidence: 99%

“…During shipment, storagea nd ignition,t he solid propellants inside aS RM generally suffer from diverse loadings [1,2].T od etermine the integrity and service life of the SRM, it is necessary to evaluatet he stress and strain distributionsa sw ell as the aging and damage of the solid propellant grainsb ased on viscoelastic constitutive theory and computational modeling [1][2][3][4].N umerical analyses performed by various researchers clearly demonstrated that the Poisson's ratio variation in solid propellant grains has as ignificant effect on the resulting stress and strain response. Despite the Poisson's ratio is generally treated as ac onstant for simplicity,m odels that assume ac onstantP oisson ratio usually cannot achieve good results, especially for short-duration loading cases.…”

mentioning

confidence: 99%

Determination of Viscoelastic Poisson’s Ratio of Solid Propellants using an Accuracy‐enhanced 2D Digital Image Correlation Technique

Pan

Yuan

et al. 2015

Propellants Explo Pyrotec

View full text Add to dashboard Cite

1IntroductionAs ak ey component of as olid rocket motor( SRM), the structural integrity of solid propellantsp lays ac rucial role in its service life evaluation. During shipment, storagea nd ignition,t he solid propellants inside aS RM generally suffer from diverse loadings [1,2].T od etermine the integrity and service life of the SRM, it is necessary to evaluatet he stress and strain distributionsa sw ell as the aging and damage of the solid propellant grainsb ased on viscoelastic constitutive theory and computational modeling [1][2][3][4].N umerical analyses performed by various researchers clearly demonstrated that the Poisson's ratio variation in solid propellant grains has as ignificant effect on the resulting stress and strain response. Despite the Poisson's ratio is generally treated as ac onstant for simplicity,m odels that assume ac onstantP oisson ratio usually cannot achieve good results, especially for short-duration loading cases. In fact, the Poisson'sr atio of solid propellants, known as at ime-temperature dependent viscoelastic property,i sacomplex function dependent on both time and load histories [5]. Thus, to feed the numerical techniques, experimental determination of time-varying Poisson's ratio of the propellant grains is of practical importance. However,s ince solid propellant grains are very flexible and soft in nature, it is extremely challenging to use existing experimental techniques to accurate measure its time-dependent Poisson's ratio, whichi se xpected to vary from compressible (v < 0.5) to incompressible (v % 0.5) and thusd emanding very high accuracyo ns train measurements.To determine the Poisson's ratio of solid propellants, both indirect and direct measurementt echniquesc an be used [6][7][8].T he indirect measurement methods first measure other material parameters, such as tensile/compressive modulus ands hear modulus, Poisson's ratio is then numerically computed based on the transversal relationship among these material parameters. Becauset he indirect techniques involve multiple measurement and fitting of several mechanical parameters, their practical implementation is not only troublesome, but also prone to induce large measuremente rrors due to the error accumulation involved in various steps.I nc ontrast, the direct measurement

show abstract

“…Solid propellants are viscoelastic materials and the Poisson's ratio of solid propellants is an essential input parameter in structural integrity analysis of solid rocket motors (SRM). It has been shown that changes of the Poisson's ratio in micrometer level have great influence on the structural integrity analysis of solid rocket motors . It is commonly assumed that the Poisson's ratio is a material constant and independent of temperature and strain .…”

Section: Introductionmentioning

confidence: 99%

“…

1IntroductionThe viscoelastic Poisson's ratio, n(t), is amaterialm echanical property,w hich is closely related to time,t emperature, and strain [1][2][3][4][5][6][7][8][9][10][11].S olid propellants are viscoelastic materials and the Poisson's ratio of solid propellants is an essential input parameter in structural integrity analysis of solid rocket motors (SRM). It has been shown that changes of the Poisson's ratio in micrometer level have great influence on the structural integrity analysis of solid rocket motors [12,13].I ti sc ommonly assumed thatt he Poisson'sr atio is am aterial constant and independent of temperature and strain [14,15].I na ddition, the aging effect on the Poisson's ratio attracts attention in the shelf life predictiono fp ropellants [16].T hus, there are practical as well as theoretical aspects that make it highly desirable to stimulatet he experimental determination of the Poisson's ratio of solid propellants on as ecure analyticalf oundation.Previously,i th as been attempted to use manyd irect or indirect methods measure viscoelastic Poisson's ratio for al ong time. Kugler et al measured both the uniaxial extension and the lateralc ontraction on ag lass bead filled,c om-poundedH ypalon rubber using electro-optical extensometer in stress relaxation tests.

…”

mentioning

confidence: 99%

Study on the Viscoelastic Poisson‘s Ratio of Solid Propellants Using Digital Image Correlation Method

Cui

Tang

Shen

2016

Propellants Explo Pyrotec

View full text Add to dashboard Cite

Digital image correlation methods were used for further studies of the viscoelastic Poisson's ratio of solid propellants. The Poisson's ratio and the Young's relaxation modulus of solid propellants were separately determined in a single stress relaxation test. In addition, the effects of temperature, longitudinal strain, preload and storage time on the Poisson's ratio of solid propellants were discussed. The Poisson's ratio master curve and the Young's relaxation modulus master curve were constructed based on the time‐temperature equivalence principle. The obtained results showed that the Poisson's ratio of solid propellants is a monotone non‐decreasing function of time, the instantaneous Poisson's ratio increased from 0.3899 to 0.4858 and the time of the equilibrium Poisson's ratio occurred late when the temperature was varied from −30 °C to 70 °C. The Poisson's ratio increased with temperature and longitudinal strain, decreased with preload and storage time, while the amplitude Poisson's ratio increased with preload, decreases with longitudinal strain and storage time. The time of the equilibrium Poisson's ratio occurred in advance with the increase of longitudinal strain, preload and storage time.

show abstract

Poisson Ratio Effect on Stress Behavior of Propellant Grains Under Ignition Loading

Cited by 18 publications

References 9 publications

Investigation on Viscoelastic Poisson’s Ratio of Composite Materials considering the Effects of Dewetting

Investigation on Viscoelastic Poisson’s Ratio of Composite Materials considering the Effects of Dewetting

Determination of Viscoelastic Poisson’s Ratio of Solid Propellants using an Accuracy‐enhanced 2D Digital Image Correlation Technique

Study on the Viscoelastic Poisson‘s Ratio of Solid Propellants Using Digital Image Correlation Method

Contact Info

Product

Resources

About