Microscale Simulation on Mechanical Properties of Al/PTFE Composite Based on Real Microstructures

Ge, Chao; Dong, Yongxiang; Maimaitituersun, Wubuliaisan

doi:10.3390/ma9070590

Cited by 43 publications

(26 citation statements)

References 37 publications

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“…To figure out the ignition detail, an “up‐and‐down” testing method was conducted by SHPB in an attempt to obtain the ignition threshold of reactive materials with different initial damages . By this method, once ignition occurred, the velocity of striker bar should be reduced in the next test; otherwise, the velocity should be raised.…”

Section: Methodsmentioning

confidence: 99%

The Influence of Initial Defects on Impact Ignition of Aluminum/Polytetrafluoroethylene Reactive Material

Ren

Ning

et al. 2019

Adv Eng Mater

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Aluminum/polytetrafluoroethylene (Al/PTFE) reactive material is a typical multifunctional energetic material, which can release enormous energy under impact loading. To clarify its ignition mechanism, a Split Hopkinson pressure bar (SHPB) is used to conduct the impact ignition experiment on reactive materials with different initial defects. The experimental results show that the measured minimum specific incident energy that can cause the ignition for the specimen without pre‐impact (MSed specimen) increases slowly from 97.5 to 101 Jcm−2 with the molding pressure first, but drops substantially to 83.3 Jcm−2 as the molding pressure increases to 100 MPa. In addition, only the MSed specimens with the molding pressure above 100 MPa are ignited at the third stress pulse. Combined with the results of scanning electron microscopy, it is found that the existence of local larger pores inside the MSed specimens with high molding pressures (100, 120, and 150 MPa) contributes to the increase in damage level under impact and thus reduces the ignition threshold. The impact ignition experiment on the pre‐impacted specimens (MSed + PIed specimens) indicates that a phenomenon of damage sensitization exists in Al/PTFE reactive materials, confirming that the initial defects and damage evolution have significant effects on the impact ignition of the material.

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Section: Methodsmentioning

confidence: 99%

The Influence of Initial Defects on Impact Ignition of Aluminum/Polytetrafluoroethylene Reactive Material

Ren

Ning

et al. 2019

Adv Eng Mater

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“…An elevated temperature, typically between 375 and 385 °C, is used during consolidation to ensure the structural integrity . The methodology is refined in further work, for example, refs . The materials can be pressed to more than 99% of their theoretical maximum density (TMD), which is approximately 2.33 g cm −3 for the stoichiometric composition.…”

Section: Structures Of Rsm and Methods Of Their Preparationmentioning

confidence: 99%

“…PTFE is a very attractive oxidizer thermodynamically, and the interest in metal‐PTFE composites as RSM has been maintained over the years. More recently, composites incorporating other metals, such as titanium, zirconium, tungsten, and others in addition to, or instead of aluminum were prepared and characterized …”

Section: Structures Of Rsm and Methods Of Their Preparationmentioning

confidence: 99%

Reactive Structural Materials: Preparation and Characterization

Hastings

Dreizin

2017

Adv Eng Mater

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Reactive structural materials, which can serve both as structural elements as well as a source of chemical energy released upon initiation have emerged as an important class of metal-based composites for use in various energetic systems. Such materials rely on a variety of exothermic reactions, from oxidation to formation of metal-metalloid and intermetallic phases. The rates of these reactions are as important as the energy that may be released, in order for them to occur at the time scales compatible with the requirements of applications. Therefore, chemical composition, scale at which reactive components are mixed, and the structure and morphology of materials are important and can be controlled by the method of preparation and compaction of the composite materials. Methods of preparation of the composite structures are briefly reviewed as well as methods of characterization of their mechanical and energetic properties. In addition to common thermo-analytical and static mechanical property measurements, dynamic tests of mechanical properties as well as ignition and combustion experiments are necessary to understand the fragmentation, initiation, and heat release expected for these materials when they are stimulated by an impact, shock, or rapid heating. Reaction mechanisms are studied presently for the thin layers and small samples of reactive materials initiated in carefully designed experiments. In other experiments, impact and explosive initiation are characterized for larger material compacts in the conditions imitating practical scenarios. Examples of results describing thermal, impact, and explosive initiation of some of the reactive materials are presented.

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“…(a) Intense shear region and first sign of ignition during Taylor rod impact test of PTFE/Al[12]; (b) shear stress contour from Taylor bar impact modeling; (c) plastic strain distribution in PTFE/Al under compression at microscale[20].…”

mentioning

confidence: 99%

Experimental Study on Impact‐induced Initiation Thresholds of Polytetrafluoroethylene/Aluminum Composite

Dong

Maimaitituersun

et al. 2017

Propellants Explo Pyrotec

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Impact experiments were conducted with a gas gun to investigate the impact-induced initiation thresholds of a polytetrafluoroethylene/aluminum (73.5 wt % and 26.5 wt %) composite. Targets of steel, aluminum, and lowdensity polyethylene materials and sample rods of four different lengths were used to decouple the effects of impact pressure and loading strain rate. By subjecting the samples to different loading conditions, it was shown that the impact-induced initiation of polytetrafluoroethylene/aluminum is decided by the impact pressure and the loading strain rate simultaneously. The impact pressure and strain-rate thresholds for initiation were arrested by the experiments. A 308 inclined steel target was used to produce a compression-shear configuration as a comparison with the normal impact experiments. The initiation was more likely to happen; it demonstrated a shear-induced initiation mechanism, and a lower initiation strain-rate threshold was observed under oblique impact. Based on the experimental results, two theoretical curves were proposed to predict the impact-induced initiation of polytetrafluoroethylene/aluminum under normal and 308 oblique impact.

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Microscale Simulation on Mechanical Properties of Al/PTFE Composite Based on Real Microstructures

Cited by 43 publications

References 37 publications

The Influence of Initial Defects on Impact Ignition of Aluminum/Polytetrafluoroethylene Reactive Material

The Influence of Initial Defects on Impact Ignition of Aluminum/Polytetrafluoroethylene Reactive Material

Reactive Structural Materials: Preparation and Characterization

Experimental Study on Impact‐induced Initiation Thresholds of Polytetrafluoroethylene/Aluminum Composite

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