Spall fracture: Mechanical and microstructural aspects

Chévrier, P.; Klepaczko, J.R.

doi:10.1016/s0013-7944(99)00022-3

Cited by 31 publications

(25 citation statements)

References 5 publications

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“…The 1.05-3.3 GPa range of pressures are those experimentally observed and theoretically calculated by Chevrier and Klepaczko (31,32) to be necessary for time and load-dependent incipient spall failure in 7020. It is generally understood that the first stage of spall is controlled by a critical stress level linked to the microstructure and that the spall damage is a result of tensile stress created by reflection of compressive waves at interfaces.…”

Section: Application Of Jmatpro Thermophysical Elastic Moduli: Modelssupporting

confidence: 52%

“…High hydrostatic pressure suppresses void growth, thereby delaying fracture. Hydrostatic tension accelerates void growth (29)(30)(31)(32). It is reasonable to apply JMatPro calculated values of elastic moduli to models that predict microscale shear stress to evaluate the sensitivity and capability of microconstituent particles to induce plasticity (27)(28)(29) or microcracking on the surrounding matrix material under loading by hydrostatic pressure or stress (30).…”

Section: Jmatpro Thermophysical Properties Derived From Gibbs Free Enmentioning

confidence: 99%

Section: Application Of Jmatpro Thermophysical Elastic Moduli: Modelsmentioning

confidence: 99%

“…The equivalent values of particle misfit shear stress and shear yield stress occur at a hydrostatic pressure load of 1.95 GPa for 7020 that corresponds to a load time for spall near 1-µs duration (31,32). It may also be observed that particles of the Al 6 Mn,  AlFeMnSi, and E AlCrMgMn phases, common to 7020, 7039, and 7075 (see figures [31][32][33][34][35][36], induce the greatest levels of shear stress. Figure 42 plots the microscopic maximum shear stress data from table 12 as the response of imposed macroscopic pressure over the range of the 1.05-3.3 GPa hydrostatic pressures necessary for incipient spall in 7020 that respectively correspond to ~7020 spall load time intervals of 2-0.5 µs.…”

Section: Application Of Jmatpro Thermophysical Elastic Moduli: Modelsmentioning

confidence: 99%

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Computational Thermodynamics Characterization of 7075, 7039, and 7020 Aluminum Alloys Using JMatPro

Chinella¹,

Guo²

2011

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, ARL-TR-5660 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES* Sente Software Ltd., Surrey Technology Centre, 40 Occam Rd., Guildford GU2 7YG, UK ABSTRACTThermodynamics-dependent microstructure, phase, and physical model predictions of material characteristics are demonstrated for aluminum alloys 7020 (Al-4.5Zn-1.2Mg), 7039 (Al-4.0Zn-2.8Mg), and 7075 (Al-5.6Zn-2.5Mg-1.6Cu) by direct application of Sente Software Ltd.'s Java Materials Program (JMatPro) mesoscale computation materials engineering software. JMatPro reveals phase constitutions as a function of input composition, temperature, and time; with the use of material property databases and physical models, it calculates temperature-dependent physical and mechanical properties. The JMatPro material property software provides better and more rapid understanding of materials during research, processing, product manufacture, and service. In this report, JMatPro reveals how structural and protection materials may meet design requirements for low cost, fabricability, and durability. With secondary application, the elastic bulk moduli for intermetallic phase inclusions derived from Gibbs energy by JMatPro are used to predict the maximum levels of microscale shear stresses under hydrostatic pressure. With comparison to conditions known to cause incipient spall in 7020 alloy, the levels of microscale shear stress around intermetallic inclusions are shown to equal or exceed the level of Von Mises calculated shear yield strength of 7020 alloy, revealing that deformation may occur during high load spall events, even at the initial stages of compression. iii SUBJECT TERMS

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Section: Application Of Jmatpro Thermophysical Elastic Moduli: Modelssupporting

confidence: 52%

Section: Jmatpro Thermophysical Properties Derived From Gibbs Free Enmentioning

confidence: 99%

Section: Application Of Jmatpro Thermophysical Elastic Moduli: Modelsmentioning

confidence: 99%

Section: Application Of Jmatpro Thermophysical Elastic Moduli: Modelsmentioning

confidence: 99%

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Computational Thermodynamics Characterization of 7075, 7039, and 7020 Aluminum Alloys Using JMatPro

Chinella¹,

Guo²

2011

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“…In this case, the superposition of two waves in the specimen thickness, incident compressive pulse and reflected tensile pulse, sets material in tension and causes damage leading to spallation [26].…”

Section: Introductionmentioning

confidence: 99%

A non-equilibrium approach to processing Hopkinson Bar bending test data: Application to quasi-brittle materials

Delvare

Hanus

Bailly

2010

International Journal of Impact Engineering

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International audienceThe aim of this paper was to describe a method of analysing the test data recorded during a Hopkinson Bar bending test. This three-point dynamic bending test was designed for testing the strength of materials under dynamic loads. It is carried out on a specimen consisting of a beam placed on two supports, which is subjected to an impact. The use of Hopkinson Bar as supports makes it possible to determine the forces and displacements at these points. An analytical solution for the transient response of a long beam subjected to a transverse impact was used to determine the impact force and the displacement. This procedure applies for the first few instants when the motions generated by the impact have not yet reached the supports, and the mechanical state of the specimen is identical to that of an unsupported beam. It is suitable for use with quasi-brittle materials for which failure occurs at the very beginning of the test. The material strength is determined at the time of failure, which is characterised by a sudden decrease in the bending moment. The results of a test in which a quasi-brittle material was loaded up to failure are presented and analysed as outlined above. The results obtained confirm the relevance of the present method

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Micro‐Shear Stress and Damage Predictions from Hydrostatic Stress Loading of Aluminum Alloys 7075, 7039, and 7020

Chinella

2012

Supplemental Proceedings

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Spall fracture: Mechanical and microstructural aspects

Cited by 31 publications

References 5 publications

Computational Thermodynamics Characterization of 7075, 7039, and 7020 Aluminum Alloys Using JMatPro

Computational Thermodynamics Characterization of 7075, 7039, and 7020 Aluminum Alloys Using JMatPro

A non-equilibrium approach to processing Hopkinson Bar bending test data: Application to quasi-brittle materials

Micro‐Shear Stress and Damage Predictions from Hydrostatic Stress Loading of Aluminum Alloys 7075, 7039, and 7020

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