Effect of constraint and latent hardening ratio on the plastic flow around a crack tip in a hardening FCC single crystal

Deka, Nipal; Jonnalagadda, Krishna

doi:10.1016/j.ijplas.2018.11.012

Cited by 11 publications

(5 citation statements)

References 45 publications

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“…Though, the spread of the strain localization along the kink shear band is lesser compared to the forward band. The magnitude of this strain component along both the bands were negative which was earlier noticed in previous experimental 15,20 and computational studies 22,39 under monotonic loading. Here, a progressive accumulation of plastic strain along these two particular localization bands was observed during the cyclic evolution of the strain component,

ϵ_{11}

.…”

Section: Resultssupporting

confidence: 82%

Section: Strain Fields Near the Notchsupporting

confidence: 83%

“…Moreover, this shift was prominent along the directions corresponding to the angular positions of 55° and 90° compared to 125°, which correlated well with the previous observation of progressive strain accumulation along the forward and the kink shear bands. However, as the cyclic load progressed, it was noticed that the strain trajectories showed an affinity to be in the third quadrant of strain space, which was earlier observed in hardening Cu single crystal for negative constraint level under monotonic loading as reported in Deka and Jonnalagadda 39 . As mentioned earlier, these components of strain tensor can be considered as the plastic strain components.…”

Section: Resultssupporting

confidence: 56%

“…However, as the cyclic load progressed, it was noticed that the strain trajectories showed an affinity to be in the third quadrant of strain space, which was earlier observed in hardening Cu single crystal for negative constraint level under monotonic loading as reported in Deka and Jonnalagadda. 39 As mentioned earlier, these components of strain tensor can be considered as the plastic strain components. So to capture this combined effect of expansion and shift of plastic strain trajectories, it is prudent to use combined isotropic and non-linear kinematic hardening rule in any numerical analysis.…”

Section: Strain Trajectories Around the Notchmentioning

confidence: 99%

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Localized strain evolution and accumulation at the notch tip of an aluminum single crystal under cyclic loading

Deka

Singh

Jonnalagadda

2023

Fatigue Fract Eng Mat Struct

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A synchronized analysis of strain localization and slip system interaction, with full‐field strain mapping, in the vicinity of a notch tip in aluminum single crystal is presented. Progressive strain accumulation, prominently along one of the slip shear bands, was demonstrated quantitatively under cyclic loading, using digital image correlation. This dominant slip band potentially critical for the nucleation and growth of a crack. Also, triple slip active regions found on the surface indicate the participation of all three in‐plane slip systems. Therefore, the use of either diagonal or weakly coupled hardening rule is recommended even in aluminum single crystals, instead of the commonly used isotropic models. Finally, the results from this work provide quantitative data on the progressive strain accumulation and localization around a notch under cyclic loading that can be used in model validation for single and polycrystal plasticity.

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ϵ_{11}

.…”

Section: Resultssupporting

confidence: 82%

Section: Strain Fields Near the Notchsupporting

confidence: 83%

Section: Resultssupporting

confidence: 56%

Section: Strain Trajectories Around the Notchmentioning

confidence: 99%

See 2 more Smart Citations

Localized strain evolution and accumulation at the notch tip of an aluminum single crystal under cyclic loading

Deka

Singh

Jonnalagadda

2023

Fatigue Fract Eng Mat Struct

Self Cite

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“…It was considered the effect of specimen type under a lower stress ratio was greater than that under a higher stress ratio. Deka [13] also studied the constraint effect by changing specimen geometry and loading type on fatigue crack growth. It was concluded that the higher constraint inhibited the accumulation of plastic strain, accompanied by the reduction of the number of triple slip zones near the crack tip.…”

Section: Effects Of Constraint On Fatigue Crack Growthmentioning

confidence: 99%

Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element Method

Miao

Hong

et al. 2022

Metals

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Mechanical behaviors at fatigue crack tips of cracked specimens under negative loading ratios are studied in detail by the finite element method in this paper. Three factors induced by specimen type and loading type on fatigue crack field are discussed, including constraint, compressive loading effect (CL effect) and crack contact closure. For mode I crack under negative loading ratios, the effects of the CL effect and crack contact closure on plastic strain accumulations are dominant, with the constraint effect being minor. The constraint effect has effects on the monotonous plastic zone, while the CL effect and contact closure both have effects on the reversed plastic zone (RPZ) and residual tensile plastic zone (RTPZ). That is, the higher the constraint, the smaller the size of the monotonous plastic zone; the greater the CL effect, or the smaller the contact degree, the larger the size of RPZ and RTPZ. For mode II crack, there is only CL effect on the crack tip field without the effect of constraint and contact closure, so plastic strain accumulation at the mode II crack tip is much greater than that at the mode I crack tip when they are under the same loading level.

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A low constraint center cracked Brazilian disk specimen for ductile FCC single crystal

Deka

Jonnalagadda

2021

Int J Fract

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Effect of constraint and latent hardening ratio on the plastic flow around a crack tip in a hardening FCC single crystal

Cited by 11 publications

References 45 publications

Localized strain evolution and accumulation at the notch tip of an aluminum single crystal under cyclic loading

Localized strain evolution and accumulation at the notch tip of an aluminum single crystal under cyclic loading

Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element Method

A low constraint center cracked Brazilian disk specimen for ductile FCC single crystal

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