Dynamic finite element analysis of solid propellant impact test

So, W; Francis, E. C.

doi:10.2514/3.26296

Cited by 12 publications

(2 citation statements)

References 4 publications

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“…Despite the lack of analyses on gun-launched missiles, there have been articles regarding the ignition of energetic materials under dynamic loads. So et al [28] analysed a solid propellant specimen's response in drop weight tests and concluded that frictional stresses caused shear bands at the sliding surfaces. Field et al [29] conducted a series of experiments on several types of samples including propellants and discussed their ignition mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Thermal Safety of a Gun‐Launched Missile's Solid Rocket Motor Under Conditions of High Environm. Temp. and Overloaded Forces

Wang

Sui

et al. 2018

Propellants Explo Pyrotec

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To verify a hypothetical failure cause of a gunlaunched missile's solid rocket motor (SRM) under conditions of high environmental temperatures and overloaded forces of up to 6000~12000 g, experiments and simulations were conducted and a new criterion variable was proposed. Uniaxial compression tests of the composite modified double base (CMDB) propellant used in the gun-launched missile were carried out at low and intermediate strain rates at 50 8C to characterize the CMDB propellant's dynamic properties. The Schapery nonlinear viscoelastic constitutive model was employed and applied in finite element analy-ses. Contact and an oscillating frictional direction between the grain and the case were observed when the overload curve oscillated with time. Three key variables of the process were researched: the contact pressure, the relative velocity, and the total contact time. Based on these, a new criterion variable q is proposed for judgements regarding the SRM's thermal safety. By comparing the results with those from friction sensitivity tests, it was discovered that the grain had a possibility of self-ignition that cannot be ignored. Meanwhile, the gap width between the case and the grain was determined to be a key influencing factor.Keywords: gun-launched missile · CMDB propellant · high oscillational overload · high temperature · explosion [a] W.

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Section: Introductionmentioning

confidence: 99%

Thermal Safety of a Gun‐Launched Missile's Solid Rocket Motor Under Conditions of High Environm. Temp. and Overloaded Forces

Wang

Sui

et al. 2018

Propellants Explo Pyrotec

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“…Composites response under impact force was studied by many researchers based on the developed drop weight impact test machines. For instance DWIT machines have been developed by (Zoller (1983); Winkel and Adams (1985); So and Francis (1991); Ambur et al (1995); Toropov and Grosso (1998); Barr and Baghli (1998) and Gunawan et al (2011)). The research results show that the duration of Impact is about millisecond.…”

Section: Introductionmentioning

confidence: 99%

Designing and manufacturing of a drop weight impact test machine

Taheri‐Behrooz¹,

Shokrieh²,

Abdolvand³

2013

10.5267/j.esm

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A state of the art instrumented Drop Weight Impact Tester Machine was developed in Iran University of Science and Technology which measures the energy absorption of composite materials under impact load. The output of the machine is used to draw load-time graph and calculate the amount of energy absorbed by the specimens. The machine was equipped with various sensor systems to measure the velocity of the impactor just before it contacts the specimen and the amount of contact force, and with a data acquisition system to record the force and time history. Capability of testing according to many different types of standards and capability of studying behaviour of the specimen after impact are two important characteristics of this machine. This designed system, after manufacturing and calibration, was installed and successfully utilized.

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Hybrid Continuum and Multi‐Particle Simulation of RDX Powder Subjected to Drop Impact

Yakaboski,

Kumar

2024

Propellants Explo Pyrotec

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A variety of energetic material (EM) devices could be designed more efficiently with a more rapid protocol of modeling and testing if computational tools are more predictive. Drop weight impact tester (DWIT) is widely used to experimentally study energetic material response to impact. Drop weight impact on a thin layer of RDX powder is studied here and computationally modeled to compute the likelihood of EM powder ignition from low‐speed impact. The overall objective is to develop a thermomechanical‐based FEM methodology that can qualitatively predict ignition‐likelihood to study iginition mechanics in EM powders and understand how anvil properties and striker impact conditions influence it. The mechanical confinement conditions offered by an anvil and striker type, influence energy transmission and heat localization within the energetic powder. Efficiently modeling both the bulk behavior and the mesoscopic behavior, such as, localized shear and particle‐to‐particle frictional heating, is necessary to design insensitive EM‐devices. A 3D finite element modeling (FEM) approach is described that more accurately models the impact conditions than previously developed 2D models. The results are compared with the experimental results and the 2D simulations. A continuum‐based explicit FEM can only simulate the bulk‐behavior of the powder. To accurately predict hot‐spot ignition mechanisms, meso‐scale multi‐particle models of the EM is needed. For computational efficiency, hybrid models that combines continuum and multi‐particle FEM (MPFEM) were utilized. The computed temperature profiles are compared for two anvil types and demonstrates that an assessment of ignition likelihood is viable with the hybrid methodologies proposed.

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Dynamic finite element analysis of solid propellant impact test

Cited by 12 publications

References 4 publications

Thermal Safety of a Gun‐Launched Missile's Solid Rocket Motor Under Conditions of High Environm. Temp. and Overloaded Forces

Thermal Safety of a Gun‐Launched Missile's Solid Rocket Motor Under Conditions of High Environm. Temp. and Overloaded Forces

Designing and manufacturing of a drop weight impact test machine

Hybrid Continuum and Multi‐Particle Simulation of RDX Powder Subjected to Drop Impact

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