Ballistic and mechanical properties of HTPB based composite propellants

Patil, Mayuri; Singh, Haridwar

doi:10.1016/0304-3894(88)80026-8

Cited by 17 publications

(14 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3. Tensile strength of the basic composition is 0.78 MPa and is comparable to 0.7-0.8 MPa reported in literature [11][12][13] for 86 % solid loading propellants. As the result shown in the Table 3 But, in the present study the percentage elongation is lower and Young's modulus is higher for the propellants as compared to reported in literature 11 .…”

Section: A Preparation Of Propellant Samplessupporting

confidence: 82%

Role of moisture in activated charcoal in composite solid propellant

Verma¹,

Ramakrishna²

2011

47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

View full text Add to dashboard Cite

Experiments were conducted to examine the role of moisture in activated charcoal on the performance parameter like burn rate and burn rate pressure index of the aluminized composite solid propellant. Propellants with moisture present in the activated charcoal were cured and shown to be free from blow holes and voids. They were also shown to have good mechanical properties. It was noticed that burn rate and burn rate pressure index is higher for propellant composition containing very small percentage (0.16 % and 0.6 % of the weight of the propellant) of moisture trapped inside the pores of activated charcoal as compared to the composition without moisture. Propellants were also prepared to examine the role of moisture in activated charcoal when mixed along with other known burn rate modifiers like copper chromite and iron oxide. Activated charcoal with moisture along with known burn rate modifiers like copper chromite or iron oxide futher increased the burn rate as compared to the propellant containing only copper chromite or iron oxide. NomenclatureAP = ammonium perchlorate Al = aluminum CC = copper chromite DOA = di octyl adipate E = Young's modulus HTPB = hydroxyl terminated poly-butadiene IO = iron oxide IPDI = isophorone di-isocynate ρ p = propellant density m = mass ρ = density

show abstract

Section: A Preparation Of Propellant Samplessupporting

confidence: 82%

Role of moisture in activated charcoal in composite solid propellant

Verma¹,

Ramakrishna²

2011

47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

View full text Add to dashboard Cite

show abstract

“…AP,o btained from Firefox Enterprises, was included in all propellantf ormulations to servea san oxidizer.P ropellant formulations contained either am onomodal blend of AP with an average size of approximately 250 mmo rabimodal blend of AP with average particle sizes of approximately 250 and 20 mma tafine-to-coarse ratioo f3 0/70. Previous research has shownt hat the overallA Ps ize distribution, mass loading,a nd modality all play roles in how well titania can act as ab urning rate enhancer [ 4,6].A dditionally,t he final mechanical properties of the propellant are influenced by these same parameters [53],a nd previous research has confirmedt hesed ependencies [18,54,55].A ccordingly,t he AP size distributions for both the coarse and fine AP,g enerated by Fluid Energy Co. using Fraunhofer imaging, are shown in Figure 2.…”

Section: Propellant Ingredientsmentioning

confidence: 77%

“…In the 85 %A PCP bimodal series,t he addition of dry powder titania to the propellant enhanced its ductility, but decreased its ultimate strength. The decrease in strength associated with an increase in ductility is typical of polymer-filler composites [51,54,55].T he pre-mixed titania formulation performed similarly to the dry-powder formulation, with as lightly higher ultimate strength. The addition of in-situt itania to the propellant also enhancedi ts ductility,b ut to al esser extent and with am ore-significant reduction in ultimate strength.…”

Section: Methodsmentioning

confidence: 99%

Mechanical Properties of Composite AP/HTPB Propellants Containing Novel Titania Nanoparticles

Thomas

Demko

Sammet

et al. 2016

Propellants Explo Pyrotec

View full text Add to dashboard Cite

Modern chemical synthesis techniques have allowed for improved incorporation of nano‐scale additives into solid propellants. Various methods were implemented to incorporate titania nanoparticles into three representative ammonium perchlorate composite propellants (APCP), and the mechanical properties of each formulation were tested and compared to those of an analogous baseline. Advanced imaging techniques were applied to all particle synthesis methods to characterize particle size and particle network type and size. Uniaxial tensile testing was performed to measure propellant ultimate strength, ductility, and elastic modulus. In general, the addition of nano‐titania additives to the propellant decreased propellant strength and modulus, but improved ductility. Propellant formulations containing in‐situ titania exhibited an increase in ductility of 11 %, 286 %, and 186 % with a corresponding reduction in strength of 82 %, 52 %, and 17 % over analogous baselines. These trends corresponded to a simultaneous decrease in propellant density, indicating that when implementing nano‐sized additives, care must be taken to monitor the effect of the altered manufacturing techniques on propellant physical properties in addition to just monitoring burning rates. Tailoring of propellant manufacturing procedures and the addition of Tepanol bonding agent to an in‐situ APCP formulation fully recovered the propellant density and ultimate strength while retaining the enhanced ductility.

show abstract

“…Manufactured propellants contained only polyfunctional diols in the HTPB R45 M and had a cure ratio of 0.82, which has been shown to yield the greatest ductility [14,19]. Mechanical properties of particulate composites are influenced by particle loading, size, and distribution [21], and previous research has confirmed these dependencies in composite AP/HTPB propellant [15,[22][23][24]. To improve mechanical properties and enhance bonding at the particle/binder interface, plasticizer (dioctyl adipate) and a bonding agent (HX-752) were included in all of the bimodal composite propellants.…”

Section: Mechanical Property Testingmentioning

confidence: 92%

Comparison of Commercially Available and Synthesized Titania Nano‐Additives in Composite HTPB/AP Propellant

Demko

Allen

Thomas

et al. 2016

Propellants Explo Pyrotec

View full text Add to dashboard Cite

This study presents a comparison of commercially available titania nano‐particles produced using electric wire explosion with nano‐particles manufactured by the authors using a sol‐gel synthesis process. For the present study, 20‐nm titania was purchased off‐the‐shelf. It was determined to be rough spheres of 20 nm forming large, micron‐sized agglomerates, whereas particles synthesized using the sol‐gel process were found to be fundamentally 10 nm but with sub‐micron agglomerations thereof. The nano‐titania was added to 80% AP monomodal propellants at 0.3% and 1.0% by mass. Additional, 85% bimodal‐AP mixtures were made, comparing commercial titania to the laboratory‐synthesized particles at 1.0% by mass. Another set of samples compared a method of pre‐mixing the synthesized additives directly into the binder material at 0.3% by mass of laboratory titania; two additional pre‐mixed titania batches at 0.5% by mass were doped with either Fe or Cu into the nanocrystals. All propellants were tested up to 13.8 MPa at 3.8 MPa increments. Dry powder laboratory additives show a 60‐to‐100% increase in burning rate over the baseline samples with no catalyst and a 20‐to‐30% increase over the commercial nano‐particles. Pre‐mixed additives were found to produce similar burning rate increases but with lower concentrations required. This latest generation of particle synthesis techniques was further demonstrated in this study to have great potential for future propellant catalyst development.

show abstract

Ballistic and mechanical properties of HTPB based composite propellants

Cited by 17 publications

References 5 publications

Role of moisture in activated charcoal in composite solid propellant

Role of moisture in activated charcoal in composite solid propellant

Mechanical Properties of Composite AP/HTPB Propellants Containing Novel Titania Nanoparticles

Comparison of Commercially Available and Synthesized Titania Nano‐Additives in Composite HTPB/AP Propellant

Contact Info

Product

Resources

About