First-principles study on the structural and electronic properties of clean and atomic oxygen adsorbed ZrC(0 0 1) surface

Li, Hui; Zeng, Qingfeng; Zhang, Litong; Sun, Guodong; Deng, Jian

doi:10.1016/j.commatsci.2015.01.025

Cited by 33 publications

(9 citation statements)

References 32 publications

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“…Although the temperature is 0 K in all above-mentioned first-principles calculations, it has been confirmed by many references that the experimental phenomena in the solid phase system with T N 0 K can be explained by results of first-principles calculation [40][41][42][43][44].…”

Section: Elastic Energy Of γ-Fe/mxc (M = V W or Mo) Interfacessupporting

confidence: 51%

Stability of eutectic carbide in Fe-Cr-Mo-W-V-C alloy by first-principles calculation

Guo

Liu

et al. 2016

Materials & Design

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Section: Elastic Energy Of γ-Fe/mxc (M = V W or Mo) Interfacessupporting

confidence: 51%

Stability of eutectic carbide in Fe-Cr-Mo-W-V-C alloy by first-principles calculation

Guo

Liu

et al. 2016

Materials & Design

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“…Fiber angle deviations in laminate thickness direction often emerge as secondary phenomenon (out-of-plane waviness). Typical primary imperfections within a layup causing fiber angle deviations are gaps and overlaps [48][49][50][51], wrinkles and folds [21,30,37,39,52], pores and inclusions [53] as well as ramps (ply-drop off) [30,54]. The tooling [51,[55][56][57] and processing [21,30,[56][57][58]] significantly influence the development of out-of-plane fiber waviness.…”

Section: Type Iii-wavinessmentioning

confidence: 99%

“…Lan et al [56,57] show in their work that the use of a rigid plate instead of a flexible vacuum bag during the autoclave process reduces the formation of fiber waviness. Li et al [51,55] find that out-of-plane fiber waviness caused by isolated gaps and overlaps is mainly influenced by the ply thickness. In case of multiple interacting gaps and overlaps their size additionally influences the occurring out-of-plane fiber waviness magnitude.…”

Section: Type Iii-wavinessmentioning

confidence: 99%

“…The angle between adjacent courses determines the shape and size of the resulting gaps and overlaps [22]. Within the transitions zones of gaps and overlaps (transition from pristine to defective laminate) fiber angle deviations and fiber waviness may occur [48,51,69,[71][72][73][74][75][76]. The imperfection size is the determining factor for the formation of fiber waviness [48,56,57,71,77].…”

Section: Type Iv-gap and Overlapmentioning

confidence: 99%

“…Investigations on quasi-isotropic laminates show that also the amount and arrangement of gaps and overlaps affect the laminate mechanical properties [51,76,78]. In addition, Li et al [51] and Lan et al [56,57] show the influence of the curing process on the geometric manifestation of gaps and overlaps. It is found that fiber angle deviations and waviness in the transition zones are less significant when a caul plate (contrary to a flexible vacuum bag) is used during the autoclave post-processing.…”

Section: Type Iv-gap and Overlapmentioning

confidence: 99%

See 2 more Smart Citations

Manufacturing-Induced Imperfections in Composite Parts Manufactured via Automated Fiber Placement

2019

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The automated fiber placement process (AFP) enables the manufacturing of large and geometrical complex fiber composite structures with high quality at low cycle times. Although the AFP process is highly accurate and reproducible, manufacturing induced imperfections in the produced composite structure occur. This review summarizes and classifies typical AFP-related manufacturing defects. Several methodologies for evaluating the effects of such manufacturing defects from the literature are reviewed. This review paper presents recent scientific contributions and discusses proposed experimental and simulation-based methodologies. Among the identified ten defect classes, gaps and overlaps are predominant. This paper focuses then on methods for modelling and assessing gaps and overlaps. The state of the art in modelling gaps and overlaps and assessing their influence on mechanical properties is presented. Finally, research gaps and remaining issues are identified.

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An experimental implication of long‐term hot‐wet‐aged carbon fiber/polyether ketone ketone composites: The impact of automated fiber placement process parameters and process‐induced defects

Şükür

Elmas

Eskizeybek

et al. 2023

J of Applied Polymer Sci

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During the service life of aerospace‐grade composites, process parameters and process‐induced defects may become crucial. Most studies in this field have mainly focused on the relationship between process‐induced defects and mechanical performance. However, the potential impact of process parameters and process‐induced defects on the service life of composites serving under severe service conditions has received little attention. In this work, the effects of hydrothermal conditioning on the mechanical performance of carbon fiber/polyether ketone ketone (CF/PEKK) composites are examined, along with the correlation between automated fiber placement (AFP) process parameters and process‐induced defects. For this, gap and overlap defects integrated CF/PEKK laminates were exposed to a long‐term (90 days) hot‐wet aging environment to simulate the actual service conditions. Defect‐induced composite samples reached saturation point at the end of 30 days with a mass gain of 0.2 wt%. The aging process resulted in an increase in the degree of crystallization by almost 14% without a change in the chemical structure, indicating the postcrystallization of the PEKK matrix. Even though the thermo‐mechanical performance diminished (~25%) with the aging process, storage modulus was slightly affected by process parameters and process‐induced defects. Considering the flexural and shear test results after the aging process, the impact of gap and overlap defects on the service life of AFP composites can be minimized with higher compaction forces (600 N) and lower lay‐up speeds (0.1 m/s).

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First-principles study on the structural and electronic properties of clean and atomic oxygen adsorbed ZrC(0 0 1) surface

Cited by 33 publications

References 32 publications

Stability of eutectic carbide in Fe-Cr-Mo-W-V-C alloy by first-principles calculation

Stability of eutectic carbide in Fe-Cr-Mo-W-V-C alloy by first-principles calculation

Manufacturing-Induced Imperfections in Composite Parts Manufactured via Automated Fiber Placement

An experimental implication of long‐term hot‐wet‐aged carbon fiber/polyether ketone ketone composites: The impact of automated fiber placement process parameters and process‐induced defects

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