Experimental and numerical analysis of mode II fracture between propellant and insulation

Niu, Ranming; Zhou, Qingchun; Chen, Xiong; Ju, Yang; Wei, Zhen; Zheng, Jian

doi:10.1016/j.ijadhadh.2014.03.005

Cited by 20 publications

(13 citation statements)

References 36 publications

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“…The hyperelastic model primarily affects the initial, approximately linear, rise in the resulting force prior to the onset of damage and permanent deformation. In order to match the initial slope of the experimental load/displacement curve, the values C 10 and C 01 were increased from initial values provided by Niu et al [21] while keeping D 1 unchanged. Increasing D 1 causes an increase in the volumetric compressibility of the (nearly physically incompressible) HTPB which degraded the match between simulation and experiment.…”

Section: Resultsmentioning

confidence: 99%

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Investigating deformation and mesoscale void creation in HMX based composites using tomography based grain scale FEM

Walters

Luscher

Yeager

2018

AIP Conference Proceedings

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Abstract. The microstructure of plastic bonded explosives (PBXs) significantly affects their macroscale mechanical characteristics. Imaging and modeling of the mesoscale constituents allows for a detailed examination of the deformation of mechanically loaded PBXs. In this study, a pair of explosive HMX crystals were bound with an HTPB based polymer binder and imaged using micro Computed Tomography (µCT). Delamination of the polymer binder from the crystals was induced via macro-scale application of a tensile load. Cohesive parameters for simulation of the crystal/binder interface were determined by comparing numerical and experimental results of the delamination of this bi-crystal system. Simulations showed macro-scale plastic behavior is accommodated through both crystal-binder delamination and plastic deformation of the binder itself. Imaging and simulation of this bi-crystal system demonstrated the complex interplay of material constitutive behavior and grain-scale geometry. Successful parameterization of this relatively simple mechanical system is a step toward a better understanding void nucleation in similarly composed polycrystalline composites.

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Section: Resultsmentioning

confidence: 99%

“…Elastic strains are governed by a Mooney-Rivlin hyperelastic strain energy potential function [21]. Considering an elastic deformation field characterized by the deformation gradient, F, and the corresponding left Cauchy-Green deformation tensor B = FF T , the strain energy density is defined as…”

Section: Materials Modelsmentioning

confidence: 99%

Investigating deformation and mesoscale void creation in HMX based composites using tomography based grain scale FEM

Walters

Luscher

Yeager

2018

AIP Conference Proceedings

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“…Without full characterization of the binder properties, hyperelastic parameters for HTPB as reported by Niu et al [ 39 ] are used as a baseline in these simulations. Additionally, preliminary studies by Prakash et al [ 40 ] and ongoing parameterization efforts suggest that a rate dependent plastic behavior is also applicable to the mechanical behavior of HTPB.…”

Section: Resultsmentioning

confidence: 99%

In Situ Imaging during Compression of Plastic Bonded Explosives for Damage Modeling

et al. 2017

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The microstructure of plastic bonded explosives (PBXs) is known to influence behavior during mechanical deformation, but characterizing the microstructure can be challenging. For example, the explosive crystals and binder in formulations such as PBX 9501 do not have sufficient X-ray contrast to obtain three-dimensional data by in situ, absorption contrast imaging. To address this difficulty, we have formulated a series of PBXs using octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) crystals and low-density binder systems. The binders were hydroxyl-terminated polybutadiene (HTPB) or glycidyl azide polymer (GAP) cured with a commercial blend of acrylic monomers/oligomers. The binder density is approximately half of the HMX, allowing for excellent contrast using in situ X-ray computed tomography (CT) imaging. The samples were imaged during unaxial compression using micro-scale CT in an interrupted in situ modality. The rigidity of the binder was observed to significantly influence fracture, crystal-binder delamination, and flow. Additionally, 2D slices from the segmented 3D images were meshed for finite element simulation of the mesoscale response. At low stiffness, the binder and crystal do not delaminate and the crystals move with the material flow; at high stiffness, marked delamination is noted between the crystals and the binder, leading to very different mechanical properties. Initial model results exhibit qualitatively similar delamination.

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“…Figure 15 gives the geometry of the DCB test for the propellant and insulation interface designed in reference [31]. Propellant and insulation plates (40 mm × 5 mm) are still connected by the liner part (40 mm × 0:2 mm).…”

Section: Slj Testmentioning

confidence: 99%

“…In order to investigate the debonding simulation of the propellant and insulation interface, intrinsic CZM combining the typical experimental data is drawn up by Zhou et al [30] and Niu et al [31] for mode I and mode II fracture, respectively. The double cantilever sandwich beam (DCSB) and single lap-joint (SLJ) replace the double cantilever beam (DCB) and end notched flexure (ENF) as the final test platform for the softness of propellant and insulation.…”

Section: Introductionmentioning

confidence: 99%

Mixed Cohesive Zone Modeling of Interface Debonding between Propellant and Insulation

Cui

Wei-li

2022

International Journal of Aerospace Engineering

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High-quality interface between propellant and insulation is the strict requirement difficult to quantify in solid rocket motor. In this study, the mixed mode delamination process of propellant and insulation interface is considered in double cantilever sandwich beam (DCSB) and single lap-joint (SLJ) test. The PPR cohesive zone model (CZM) and bilinear CZM in ABAQUS are introduced in this mixed fracture progress. In order to implement the PPR model in ABAQUS, user subroutine user element (UEL) is programmed for the novel CZM. Two simple pure mode I and mode II fracture problems are designed to check the accuracy of the UEL, and the result of verification is excellent. DCSB and SLJ test and their corresponding results are used again in the same inverse analysis with the two typical effective displacement-based and potential-based CZM. Base on the results, a series discussion and some conclusions are made. The debonding progress of the propellant and insulation interface in DCSB and SLJ test are mixed mode. The PPR CZM is prior in simulation than the bilinear CZM in ABAQUS because the PPR CZM is much more flexible with changeable traction-separation shape. The real normal and tangential displacement at damage initiation shows the unreasonable change in bilinear CZM in ABAQUS under mixed mode fracture. The PPR CZM and bilinear CZM in ABAQUS are all thickness-dependent model. The real initial stiffness and the critical displacement in the bilinear CZM and the real maximum traction in PPR model are dependent on the thickness of cohesive element. The different thickness dependence of the two model is caused by the implementation method.

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Experimental and numerical analysis of mode II fracture between propellant and insulation

Cited by 20 publications

References 36 publications

Investigating deformation and mesoscale void creation in HMX based composites using tomography based grain scale FEM

Investigating deformation and mesoscale void creation in HMX based composites using tomography based grain scale FEM

In Situ Imaging during Compression of Plastic Bonded Explosives for Damage Modeling

Mixed Cohesive Zone Modeling of Interface Debonding between Propellant and Insulation

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