The plastic stress ahead of a mixed mode I and II plane stress crack

Guo, Quanxin; Li, K. R.; Keer, Leon M.

doi:10.1016/0013-7944(89)90010-6

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…Based on the basic equations of elastic-plastic theory and by matching the stress field in the plastic zone with the elastic dominant field for a blunt crack, an analytical result for the plastic zone dimension on the crack line was obtained by Guo and Li. [6] In nonlinear fracture mechanics, an elastoplastic analyses was involved in large scale yielding in the vicinity of the crack tip. Mishra and Parida [7] gave the shape and size of plastic zones corresponding to different stress levels using elastoplastic finite element analysis.…”

Section: Introductionmentioning

confidence: 99%

“…Yates et al [8] studied not only the shape of plastic zone but also the direction of fatigue crack propagation using ANSYS software simulation analysis. Besides a variety of numerical analyses and simulations on crack tip plastic zone have been carried out [4][5][6][7][8][9][10], several experimental works, such as etch-pit technique, microhardness test and photostress coating method, pertaining to crack tip plasticity have also been reported in the literature. The plastic zone was revealed by etching in [11], and the conclusion was that the furthest extent of the zones was about 2 0.13( / )…”

Section: Introductionmentioning

confidence: 99%

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Derivation of Equal Area Criterion and its Application to Crack Tip Plastic Zone Analysis

Lan

Ding

et al. 2011

AMM

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A new linear yield criterion, referred to as Equal Area (EA) yield criterion, was derived in Haigh Westergaard stress space based on the projection area of its yielding locus on the π-plane equal to the area of von Mises yielding circle. Under the plane stress and strain conditions the crack tip plastic zone dimensions were calculated based on EA yield criterion and compared with those calculated according to the Tresca and von Mises yield criteria. The results showed that the crack tip plastic zone based on EA yield criterion is similar to that based on von Mises yield criterion, but is much different to that based on Tresca yield criterion. Meanwhile, the influences of Poisson ratio and loading parameter on the crack tip plastic zone were investigated based on EA yield criterion.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Derivation of Equal Area Criterion and its Application to Crack Tip Plastic Zone Analysis

Lan

Ding

et al. 2011

AMM

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Effects of Mixed Mode I/II Loading and Grain Orientation on Crack Initiation and Stable Tearing in 2024-T3 Aluminum

Amstutz

Sutton

Dawicke

et al. 1997

Fatigue and Fracture Mechanics: 27th Volume

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The effects of material grain orientation and Mixed Mode I/II loading on crack initiation and stable tearing in 2.3-mm-thick, unclad 2024-T3 aluminum is experimentally investigated. Mode I experiments were performed on center-cracked specimens with the crack being oriented at various angles relative to the rolling direction. Defining θ to be the angle between the normal to the initial crack plane and the loading direction, Mode I/II experiments were performed using an Arcan test fixture for 0° ≤ θ ≤ 90° [corresponding to 90° ≥ β ≥ 0°, where β = atan (KII/KI)] with the crack oriented either along the rolling direction (T-L) or perpendicular to the rolling direction (L-T). Results indicate that: 1. The Mode I crack tip opening displacement (CTOD) is a strong function of the orientation of the crack relative to the rolling direction; CTOD for a T-L specimen is 0.84 mm, increasing linearly with orientation angle to 1.05 mm for an L-T case. 2. The Mode I/II CTOD increases rapidly during initial increments of crack growth and then decreases towards a constant value as crack growth continues. 3. For θ < 68° (β > 29°), all cracks kinked and the Mode I/II plastic zones are similar to rotated Mode I plastic zones throughout the crack growth process. 4. JII = 0 reasonably predicts the direction of tension-dominated crack growth, but does not predict the transition to shear crack growth which occurs for θ ≥ 75°. 5. KII ≥ KI for θ ≈ 58° (β = 45°) does not quantitatively predict the transition to shear crack growth for θ ≥ 75° (β ≤ 22°), but does provide an indication of changing conditions in the crack tip region.

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The plastic stress ahead of a mixed mode I and II plane stress crack

Cited by 2 publications

References 11 publications

Derivation of Equal Area Criterion and its Application to Crack Tip Plastic Zone Analysis

Derivation of Equal Area Criterion and its Application to Crack Tip Plastic Zone Analysis

Effects of Mixed Mode I/II Loading and Grain Orientation on Crack Initiation and Stable Tearing in 2024-T3 Aluminum

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