Failure behaviors and processing maps with failure domains for hot compression of a powder metallurgy Ni-based superalloy

Article Materials Science, Multidisciplinary

Damage Analysis of Third-Generation Advanced High-Strength Steel Based on the Gurson-Tvergaard-Needleman (GTN) Model

Rafael O. Santos et al.

Summary: This study evaluated the third generation of advanced high-strength steels (AHSS) through various analyses and tests. The results showed that the CR980XG3(TM) steel has good overall formability and weak plastic anisotropy.

METALS (2022)

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Article Materials Science, Multidisciplinary

AZ31 Sheet Forming by Clustering Ball Spinning-Analysis of Damage Evolution Using a Modified GTN Model

Zhiqing Hu et al.

Summary: Clustering ball spinning (CBS) forming is a novel approach to manufacturing complex curved surfaces. This study investigates the forming limit of magnesium alloy in the CBS forming process using theoretical analyses, finite element simulation, and experimental validation. The results show that the CBS forming method improves the forming limit of AZ31 magnesium alloy, and the deformation process is dominated by extension twinning with the activation of non-basal slip systems.

METALS (2022)

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Article Materials Science, Multidisciplinary

Damage evolution of 7075 aluminum alloy basing the Gurson Tvergaard Needleman model under high temperature conditions

Hongchao Ji et al.

Summary: Based on the Gurson-Tvergaard-Needleman (GTN) damage model, the damage evolution and ductile fracture of 7075 aluminum alloy sheets during the tensile process were predicted. The damage characteristic parameters of the alloy at different temperatures were obtained using experimental observation and finite element reverse calibration methods. The influence of temperature on material damage and mechanical behavior was analyzed. The results validated the accuracy of the finite element method.

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2022)

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Article Materials Science, Multidisciplinary

Influence of powder particle size on the microstructure of a hot isostatically pressed superalloy

Zonghong Qu et al.

Summary: The influence of powder particle size on the microstructure of the powder metallurgy superalloy FGH97 was investigated. The results showed that fine powder led to limited plastic deformation, resulting in fewer boundaries and modest particle boundary decoration. On the other hand, medium-sized and coarse powder did not exhibit particle boundary. Therefore, medium-sized powder is the optimal choice.

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2022)

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Article Mechanics

Extended GTN model for predicting ductile fracture under a broad range of stress states

Hongfei Wu et al.

Summary: This study extends the GTN model by incorporating two different damage variables and updating the Lode angle dependence function to describe damage accumulation and ductile fracture under various stress states. The proposed model is validated through experiments and numerical predictions, showing good predictive ability under arbitrary loading conditions.

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES (2022)

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Article Chemistry, Physical

Prediction of Fracture Behavior of 6061 Aluminum Alloy Based on GTN Model

Fengjuan Ding et al.

Summary: The GTN damage model parameters of 6061 aluminum alloy after secondary heat treatment were determined using experimental and numerical methods. The effectiveness of the model in predicting fracture failure was verified.

MATERIALS (2022)

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Article Materials Science, Multidisciplinary

Microstructural evolution and dynamic recrystallization of a nickel-based superalloy PM EP962NP during hot deformation at 1150 °C

Bing Sun et al.

Summary: This study investigates the microstructural evolution and dynamic recrystallization mechanism of a nickel-based superalloy PM EP962NP during isothermal compression at 1150 degrees C under different strain rates and strains. The results show that continuous dynamic recrystallization occurs when the strain exceeds 0.36. A processing window with high microstructure stability, including the evolution of DRX, y grains, and y' precipitates, is determined to be hot compression at 1150 degrees C with a strain rate of 0.001 s-1 and strains ranging from 0.69 to 1.20. In addition, the y' precipitates exhibit inhomogeneous sizes due to the interaction between dissolution and precipitation, with micron-scale blocky primary y' and nano-scale spherical secondary y'. Moreover, the abundant microstructural information related to the strain rates and strains can provide a reference for obtaining gradient microstructures through thermo-mechanical processes.

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2022)

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Article Materials Science, Multidisciplinary

J-R curve determination of G20Mn5QT cast steel using CT specimen with varying in-plane and out-of-plane constraints based on normalization method and GTN model

Jie Xu et al.

Summary: This paper investigates the fracture toughness of compact tensile (CT) specimens with varying in-plane constraints. Experimental tests and numerical simulations are conducted to measure the J-R curves and analyze the fracture mechanism. The results show that increasing crack lengths lead to stronger in-plane constraints and a decrease in J-R curves. The GTN model is used to predict the J-R curves under different constraints. The study reveals that both in-plane and out-of-plane constraints have an impact on the J-R curves, and there is an interaction between them. The calibrated GTN model provides accurate predictions and proves to be a useful tool for assessing material fracture toughness.

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2022)

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Article Engineering, Mechanical

An improved shear modified GTN model for ductile fracture of aluminium alloys under different stress states and its parameters identification

Zao He et al.

Summary: The study proposed an improved shear modified GTN model for predicting ductile fracture of materials under different stress states, and validated the accuracy of the model and feasibility of the damage parameters identification method through FE analysis.

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES (2021)

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Review Materials Science, Multidisciplinary

A Review of Damage, Void Evolution, and Fatigue Life Prediction Models

Hsiao Wei Lee et al.

Summary: This review focuses on degradation, damage evolution, and fatigue models for various engineering materials, mostly metals and composites, with discussions on both empirical models and physics-based models, such as unified mechanics theory.

METALS (2021)

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Article Materials Science, Multidisciplinary