Thermo-mechanical response of tension panels under intense rapid heating

Griffis, C. A.; Chang, Chia‐Jung; Stonesifer, F. R.

doi:10.1016/0167-8442(85)90052-7

Cited by 16 publications

(6 citation statements)

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“…4(b)] at the surface features small ( m) equiaxed grains with large, quenched-in pores. The sharp boundary that appears between the FML and the partially melted layer (PML) may be due to the narrow gap between the solidus and liquidus temperatures associated with pulsed heating [14], [15]. The lack of precipitates within the small grains, along with their diminutive size, indicates rapid solidification [16].…”

Section: Typical Recovered Armaturementioning

confidence: 98%

Microstructures in the Throat Region of Recovered Aluminum-Alloy Armatures

Watt

Bryant

2007

IEEE Trans. Magn.

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Previous work investigated macroscopic features of recovered aluminum alloy armatures launched at five different currents. Here, microstructural features of those armatures are explored. Several distinct heat-treatment regimes present near the armature throat surface include grain deformation, melting, and material ejection. Two distinct cracking mechanisms are present. The first-presumably due to liquation cracking-occurs at higher currents, is intergranular, and has cracking directions independent of armature geometry directions. The second-likely due to thermal stresses-is intragranular and has strong dependence on orientation. Detailed photomicrographs of the recovered armatures are presented, along with calculated dimensions of the heat-treatment zones and observed cracks.Index Terms-Aluminum-alloy armature, microstructure.

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Section: Typical Recovered Armaturementioning

confidence: 98%

Microstructures in the Throat Region of Recovered Aluminum-Alloy Armatures

Watt

Bryant

2007

IEEE Trans. Magn.

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“…It should be noted that, in general, p, c, and K are functions of temperature. Boundary conditions are usually specified in terms of heat flux along a boundary surface such that dT dT dT (2) Initial conditions are defined in terms of initial temperature, usually constant,…”

Section: Slow Energy Depositionmentioning

confidence: 99%

Structural response of materials due to in-depth heating

Nemes

Chang

1987

Journal of Thermophysics and Heat Transfer

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The effect of uniform through-thickness energy deposition on the thermal-mechanical response of several structural materials is evaluated. Expressions used for determining temperature distributions under moderate deposition rates are presented. Temperature histories of aluminum, titanium, and graphite-epoxy panels subject to electron beam irradiation are compared with analytical results to assess the validity of the methods used. Dynamic material response under extreme deposition rates are developed for instantaneous and finite pulse deposition. Expressions for determining the regime of dominant thermal or dynamic response are given as a function of total energy and energy deposition rate.

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“…In a broad range of load-bearing applications, for instance aircraft structures, lightweight structures, bridge decks, marine crafts and off-shore platforms, structural components may be subjected to severe thermal loading. The possible sources for the intense heating environment to preloaded components may be the aerodynamic heating, laser irradiation or localized intense fire [1,2]. For example, when the work piece is clamped or the aircraft and missiles are flying at high speed, the specimen will be in the condition of external loading.…”

Section: Introductionmentioning

confidence: 99%

Failure Response of Simultaneously Pre-Stressed and Laser Irradiated Aluminum Alloys

Jelani

Shen

et al. 2017

Applied Sciences

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Abstract:The failure response of aluminum alloys under the condition of simultaneously pre-stressing and laser heating was investigated. Specimens were subjected to predetermined preloading states and then irradiated by continuous wave fiber (Yb) laser. For all specimens, it was found that the yield stress decreased with increasing laser power density. This implies that the load-bearing capacity of the specimens reduced under increased thermal or tensile loading. Consequently, the specimen's failure time was shortened by increasing either laser power density or preloaded speed. For Al-6061, a remarkable reduction in failure time by the increase of laser power density is found. However, for Al-7075, under higher preloaded speeds, comparatively smaller impact of laser power density on the failure time is reported. Moreover, for Al-6061, relatively a more non-uniform variation in the average failure time with the increase of laser power density or preloaded speed is observed. The failure mode of Al-6061 turned from brittle to ductile at higher laser power densities; whereas for Al-7075, it changed from quasi-brittle to ductile. At higher preloaded speeds, a greater degree of melting and ablation phenomenon can be seen due to relatively higher temperatures and higher heating rates.

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Thermo-mechanical response of tension panels under intense rapid heating

Cited by 16 publications

References 0 publications

Microstructures in the Throat Region of Recovered Aluminum-Alloy Armatures

Microstructures in the Throat Region of Recovered Aluminum-Alloy Armatures

Structural response of materials due to in-depth heating

Failure Response of Simultaneously Pre-Stressed and Laser Irradiated Aluminum Alloys

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