Microcrack- and microvoid-related impact damage and ignition responses for HMX-based polymer-bonded explosives at high temperature

Current experiments show that the TATB-based polymer bonded explosives (PBX) will experience irreversible growth when suffered temperature cycling load. Although some studies have already been done on this, the cause of irreversible growth is still confusing, and the mechanism is not clear. In order to study the irreversible growth of PBX under temperature cycling load, an thermal-viscoelastic model is established, Based on the Burgers model which considering the influence of different temperatures on the creep properties of PBX. The analysis shows that the irreversible growth of PBX produced by the different creep properties of high and low temperature during the thermal cycling. Comparing with low temperature, the creep rate of PBX is faster and the deformation is larger at high temperature, which lead to the irreversible growth of PBX.

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Impact damage tolerance of composite repairs to highly-loaded, high temperature composite structures

Composites Part A Applied Science and Manufacturing ◽

10.1016/j.compositesa.2011.05.015 ◽

2011 ◽

Vol 42 (10) ◽

pp. 1321-1334 ◽

Cited By ~ 23

Author(s):

A.B. Harman ◽

A.N. Rider

Keyword(s):

High Temperature ◽

Composite Structures ◽

Damage Tolerance ◽

Impact Damage ◽

Composite Repairs ◽

Highly Loaded

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Characterization, modeling and simulation of the impact damage for polymer bonded explosives

International Journal of Impact Engineering ◽

10.1016/j.ijimpeng.2017.01.014 ◽

2017 ◽

Vol 103 ◽

pp. 149-158 ◽

Cited By ~ 16

Author(s):

Youcai Xiao ◽

Yi Sun ◽

Yubao Zhen ◽

Licheng Guo ◽

Liaojun Yao

Keyword(s):

Modeling And Simulation ◽

Impact Damage ◽

Polymer Bonded Explosives ◽

The Impact

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Retrieving Fuel Elements by Pneumatic Suction in Pebble-Bed High Temperature Gas-Cooled Reactor

Volume 1: Plant Operations, Maintenance, Engineering, Modifications, Life Cycle and Balance of Plant; Nuclear Fuel and Materials; Plant Systems, Structures and Components; Codes, Standards, Licensing and Regulatory Issues ◽

10.1115/icone22-30499 ◽

2014 ◽

Author(s):

Bin Wu ◽

Jin-hua Wang ◽

Yue Li ◽

Bing Wang ◽

Ji-guo Liu

Keyword(s):

High Temperature ◽

Negative Pressure ◽

Impact Damage ◽

Storage System ◽

Spent Fuel ◽

Suction System ◽

Fuel Storage ◽

Pressure Suction ◽

Fuel Elements ◽

High Temperature Gas

Spent fuel storage system of pebble-bed high temperature gas-cooled reactor needs to retrieve fuel elements and spent fuel elements from storage tank during fuel reloading condition and some other special status. This function is to be achieved by the negative pressure suction system. Research in depth is needed towards the negative pressure suction system design and experiment in order to reliably supply the system with enough suction capability and meanwhile prevent the fuel element from over-speed impact damage. A comprehensive experimental facility of negative pressure suction was built to investigate and verify the designed system. The facility mainly comprises a fuel canister, a suction tube, a tube feeder, a gas isolator, a Roots blower and pipelines. The negative pressure suction force was provided by the Roots blower and drove the fuel elements out of the canister through the tube. The Roots blower was driven by a frequency converter so that the suction flow rate could be adjusted as wanted. The dynamics model of spherical element in the tube was established. The pressure drop distribution of the negative pressure suction system was also calculated. Then the pressure drops and the sphere velocity were measured at different air flow rates. Based on the experimental results and calculation analysis, parameter requirements for the Roots pump were concluded. Therefore, fuel elements could be successfully retrieved without over-speed impact damage. These results provide useful experience for engineering design of negative pressure suction system in the spent fuel storage system.

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Impact Damage in CFRP Laminates under High Temperature.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.60.841 ◽

1994 ◽

Vol 60 (571) ◽

pp. 841-845 ◽

Cited By ~ 3

Author(s):

In-Young Yang ◽

Tadaharu Adachi ◽

Hiroyuki Matsumoto

Keyword(s):

High Temperature ◽

Impact Damage ◽

Cfrp Laminates

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Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100071363 ◽

1973 ◽

Vol 31 ◽

pp. 184-185

Author(s):

M.S. Grewal ◽

S.A. Sastri ◽

N.J. Grant

Keyword(s):

High Temperature ◽

Nickel Alloys ◽

Thermomechanical Processing ◽

Cold Work ◽

High Temperature Strength ◽

Strengthening Effect ◽

Mechanical Processing ◽

Uniform Dispersion ◽

Oxide Particles ◽

Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

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Application of TEM to Deformation, Wear, and Fracture of Ceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052377 ◽

1974 ◽

Vol 32 ◽

pp. 472-473

Author(s):

B. J. Hockey

Keyword(s):

Wear Resistance ◽

High Temperature ◽

Mechanical Behavior ◽

Brittle Materials ◽

High Temperature Strength ◽

Wide Range ◽

Corrosive Environments ◽

Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

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