On dynamic response and fracture-induced initiation characteristics of aluminum particle filled PTFE reactive material using hat-shaped specimens

Ge, Chao; Yu, Qian; Zhang, Hao; Qu, Zhuojun; Wang, Haifu; Zheng, Yuanfeng

doi:10.1016/j.matdes.2020.108472

Cited by 40 publications

(21 citation statements)

References 19 publications

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“…In these studies, initiation was observed in areas of intense shear deformation, and it has been posited that intense heating due to the conversion of plastic work to heat inside a localization is responsible for initiation. However, Ge et al [6] and Lee et al [7] are the only previous works that the current authors are aware of that examined RMs intentionally loaded in dynamic shear, and thus this mechanism may merit further investigation. Alternately, it has been demonstrated that RMs can initiate in areas where fracture is observed [8][9][10].…”

Section: Introductionmentioning

confidence: 93%

Initiation of a Metal/Fluoropolymer Reactive Material Subjected to Dynamic Shear‐Compression Loading

Miller

Thoma²,

Kimberley

2022

Propellants Explo Pyrotec

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Structural Reactive Materials (RMs) are multi‐material composites that provide adequate structural strength and large exothermic yield. Combining the thermal energy output with kinetic energy, RMs fulfill a role in increasing the overall performance and energetic release of military weapon systems. The goal of this current research is to enhance the understanding of the thermomechanical conditions that are responsible for Al/PTFE RM ignition under dynamic loading. Two mechanisms of initiation commonly reported in the literature are shear‐induced and crack‐induced. To investigate the propensity of shear‐induced initiation a Shear Compression Specimen (SCS), combined with Kolsky Bar experimentation, was utilized to predominately load the RM specimen in dynamic shear. COMSOL Multiphysics simulations were conducted in conjunction with the experiments to obtain an equivalent stress‐strain response of the RM so that the work done on the gauge section of the SCS could be quantified. With the implementation of high‐speed cameras, the gauge section of the SCS was monitored to observe if RM ignition occurred from the dynamic shear loading. The results of the experiments conducted here indicate that fracture precedes ignition despite severe shear‐induced plastic deformation (and associated heating) occurring in the gauge section of the specimen, indicating that a crack‐induced ignition mechanism is likely active in this materials system under the studied loading rates.

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Section: Introductionmentioning

confidence: 93%

Initiation of a Metal/Fluoropolymer Reactive Material Subjected to Dynamic Shear‐Compression Loading

Miller

Thoma²,

Kimberley

2022

Propellants Explo Pyrotec

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“…The combined response behavior of reactive composites under shock loading is a complex problem, which is a strong function of the loading profile and the initial conditions in the material itself. General investigations have shown that a series of responses occur in the reactive composites ranging from simple deformation and phase changes, to chemical reactions, depending significantly on the particle morphology, initial void volume, and loading stimuli [ 17 ]. In fact, the average pressure of the detonation wave acting on the reactive liner exceeds 20 GPa, which is far greater than the threshold activated pressure of the reactive composites [ 18 ], and may lead to violent chemical reaction of the reactive composite jet during its formation process.…”

Section: Introductionmentioning

confidence: 99%

Formation Behavior and Reaction Characteristic of a PTFE/Al Reactive Jet

Guo

Zheng

et al. 2022

Materials

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To reveal the expansion phenomenon and reaction characteristics of an aluminum particle filled polytetrafluoroethylene (PTFE/Al) reactive jet during the forming process, and to control the penetration and explosion coupling damage ability of the reactive jet, the temperature and density distribution of the reactive jet were investigated by combining numerical simulation and experimental study. Based on the platform of AUTODYN-3D code, the Smoothed Particle Hydrodynamics (SPH) algorithm was used to study the evolution behaviors and distribution regularity of the morphology, density, temperature, and velocity field during the formation process of the reactive composite jet. The reaction characteristic in the forming process was revealed by combining the distribution of the high-temperature zone in numerical simulation and the Differential Scanning Calorimeter/Thermo-Gravimetry (DSC/TG) experiment results. The results show that the distribution of the high-temperature zone of the reactive composite jet is mainly concentrated in the jet tip and the axial direction, and the reactive composite jet tip reacts first. Combining the density distribution in the numerical simulation and the pulsed X-ray experimental results, the forming behavior of the reactive composite jet was analyzed. The results show that the reactive composite jet has an obvious expansion effect, accompanied by a significant decrease in the overall density.

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“…The addition of copper increased the dynamic yield and maximum strengths of modified PTFE. Ge [39] reported the thermal softening behavior of Al/PTFE under dynamic loading.…”

Section: Introductionmentioning

confidence: 99%

Effect of weave pattern on high strain rate performance of glass/polytetrafluoroethylene composites

et al. 2022

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An investigation of the effect of strain rate on the dynamic compressive behavior of glass/polytetrafluoroethylene (PTFE) composite is presented. Experimental studies were carried out on two dimensional (2D), satin weave (SW) and three dimensional (3D) woven glass/PTFE composites using split Hopkinson pressure bar (SHPB) apparatus. Commercial grades of glass/PTFE fabrics were autoclaved to prepare the composite laminates and circular specimens were cut out using a high-pressure water jet. High strain rate studies confirmed the rate-dependent behavior of all the woven composite systems under consideration. The highest rates of loading were attained by 3D woven specimens for identical incident energies. The highest peak stress attained by 3D woven specimens was 501 MPa, which was trailed by 2D woven specimens with 482 MPa stress. The advantage of satin weave was not reflected in the small specimens as the peak stress attained for identical loading was limited to 405 MPa. Similarly, the highest strain and toughness were recorded for 3D woven composites. However, the SW pattern unlocked a new possibility of controlling the primary damage axis. Furthermore, an analytical method is presented based on variable rate power law to predict the dynamic compressive stress of glass/PTFE.

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On dynamic response and fracture-induced initiation characteristics of aluminum particle filled PTFE reactive material using hat-shaped specimens

Cited by 40 publications

References 19 publications

Initiation of a Metal/Fluoropolymer Reactive Material Subjected to Dynamic Shear‐Compression Loading

Initiation of a Metal/Fluoropolymer Reactive Material Subjected to Dynamic Shear‐Compression Loading

Formation Behavior and Reaction Characteristic of a PTFE/Al Reactive Jet

Effect of weave pattern on high strain rate performance of glass/polytetrafluoroethylene composites

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