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‎content/publications/CCC2023/index.md‎

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publication_types: ["article-journal"]
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# Publication name and optional abbreviated publication name.
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publication: "*Cement and Concrete Composites*, 137, 104911"
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publication: "***Cement and Concrete Composites***, 137, 104911"
2020

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abstract: The ultra-high tensile capacity of strain-hardening fibre-reinforced cementitious composites makes them promising for impact dynamics applications, however, there is a lack of reference for taking the parameters of the constitutive model of materials in numerical simulations. In this study, the Karagozian & Case concrete/cementitious model parameters for strain-hardening fibre-reinforced cementitious composites were comprehensively and systematically calibrated. Multiaxial behaviour, crack-bridging constitutive relations, strain-rate effects, regularization of damage evolution parameters, and parameters scaling method for wide-range strength of materials were all considered and carefully discussed. The calibrated parameters were validated using low-velocity drop-weight impact tests, near-field explosion tests, and high-speed penetration tests. In this study, the traditional element erosion method and meshless/particle methods of Smoothed Particle Galerkin (SPG) method were used for failure analysis in penetration and explosion models. The results show that the calibrated parameters accurately predict the cratering and scabbing diameters and failure modes of explosion tests with the element erosion method. Furthermore, the residual velocity of the projectile and crack patterns of targets were also predicted with good precision with both element erosion and SPG methods. However, in the simulations of low-velocity impact tests, the predictions of maximum deflection were acceptable, and the errors in residual deflection were significant due to the inherent weakness of the material constitutive model.
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‎content/publications/EFM2023/cite.bib‎

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@article{Yin2023a,
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author = {Yin, Xing and Li, Qinghua and Wang, Qingmin and Reinhardt, Hans-Wolf and Xu, Shilang},
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doi = {10.1016/j.engfracmech.2022.108988},
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issn = {00137944},
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journal = {Engineering Fracture Mechanics},
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pages = {108988},
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title = {{The double-K fracture model: A state-of-the-art review}},
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volume = {277},
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year = {2023}
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}

‎content/publications/EFM2023/index.md‎

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---
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title: "The double-K fracture model: A state-of-the-art review"
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authors:
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- yinxing
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- Qinghua Li*
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- Qingmin Wang
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- Hans-Wolf Reinhardt
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- Shilang Xu
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# author_notes:
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# - "Equal contribution"
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# - "Equal contribution"
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date: "2023-01-01T00:00:00Z"
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# Publication type.
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# Accepts a single type but formatted as a YAML list (for Hugo requirements).
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# Enter a publication type from the CSL standard.
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publication_types: ["article-journal"]
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# Publication name and optional abbreviated publication name.
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publication: "***Engineering Fracture Mechanics***, 277, 108988"
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abstract: Over the past three decades, the double-K fracture model has received widespread recognition and application in the field of engineering material fracture. As the recommended method for testing the fracture properties of concrete by the Chinese Norm and the RILEM Standard, the advantages of the double-K fracture model in terms of analytic solution and simple test methods have led to its popularity and practice in both materials research and engineering applications. This article presents a state-of-the-art review on the usage of the double-K fracture model in existing research and provides an in-depth discussion of the applicability of the double-K fracture model to negative geometry. This article begins with the theoretical basis and development of the double-K fracture model. Then, a critical review of the application of the double-K fracture model in materials and engineering is performed. Thereafter, a detailed discussion of the applicability of the double-K fracture model to the negative geometry problem is provided and conducted via analytical and numerical approaches. Finally, this review article concludes with a concise summary and future work of the research on the double-K fracture model.
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tags:
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- Source Themes
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featured: false
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links:
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# - type: pdf
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# url: http://arxiv.org/pdf/1512.04133v1
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# Associated Projects (optional).
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# Associate this publication with one or more of your projects.
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projects: []
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# Slides (optional).
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# Associate this publication with Markdown slides.
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---

‎content/publications/IJMS2024/cite.bib‎

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@article{Yin2024a,
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abstract = {This study presents a two-phase mesoscale numerical model to investigate the dynamic spalling fracture behaviour of hybrid fibre ultra-high toughness cementitious composites (UHTCC). The model simulated the presence of random steel fibres and ductile UHTCC independently, and accurately incorporated the fibre-matrix bond-slip relationship, with carefully considering the influence of the inclination angle of the steel fibres on the pullout behaviour. Validation of the numerical model involved a meticulous comparison between numerical outcomes and results from spallation tests, encompassing strain-time and velocity-time histories, failure modes, and locations of cracking or fracture. Subsequently, the developed model was employed to analyse the impact of fibre inclination, stress wave amplitude, and waveform (based on the impulse equivalence principle) on the dynamic spalling fracture behaviour of hybrid fibre UHTCC. Evaluation of spalling fracture performance was based on both maximum velocity and pullback velocity of resulting fragments or free surfaces. Findings revealed that fibres parallel to the stress wave propagation direction exhibited optimum performance. It was also observed that stress waveforms with rectangular and sinusoidal shapes presented the highest risk of spalling fracture, while exponentially attenuated waves were comparatively safer. Additionally, stress waveforms with either rise time or duration at maximum pressure were deemed hazardous. Further, the hybrid fibre UHTCC demonstrated multiple spalling cracking/fracture behaviours under all stress waves except rectangular ones. This comprehensive exploration provided insights for the utilization of hybrid fibre UHTCC in impact engineering.},
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author = {Yin, Xing and Li, Qinghua and Wang, Qingmin and Chen, Bokun and Shu, Chenglanqing and Xu, Shilang},
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doi = {10.1016/j.ijmecsci.2023.108826},
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issn = {00207403},
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journal = {International Journal of Mechanical Sciences},
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keywords = {Bond-slip relationship,Mesoscale model,Spallation,Stress wave,UHTCC},
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month = {feb},
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pages = {108826},
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title = {{Mesoscale numerical investigation of dynamic spalling fracture in toughness concrete}},
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url = {https://linkinghub.elsevier.com/retrieve/pii/S0020740323007282},
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volume = {264},
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year = {2024}
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}

‎content/publications/IJMS2024/index.md‎

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---
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title: "An improved calibration of Karagozian & Case concrete/cementitious model for strain-hardening fibre-reinforced cementitious composites under explosion and penetration loadings"
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authors:
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- yinxing
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- Qinghua Li*
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- Bokun Chen
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- Shilang Xu
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# author_notes:
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# - "Equal contribution"
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# - "Equal contribution"
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date: "2023-03-01T00:00:00Z"
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# Publication type.
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# Accepts a single type but formatted as a YAML list (for Hugo requirements).
15+
# Enter a publication type from the CSL standard.
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publication_types: ["article-journal"]
17+
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# Publication name and optional abbreviated publication name.
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publication: "***Cement and Concrete Composites***, 137, 104911"
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abstract: The ultra-high tensile capacity of strain-hardening fibre-reinforced cementitious composites makes them promising for impact dynamics applications, however, there is a lack of reference for taking the parameters of the constitutive model of materials in numerical simulations. In this study, the Karagozian & Case concrete/cementitious model parameters for strain-hardening fibre-reinforced cementitious composites were comprehensively and systematically calibrated. Multiaxial behaviour, crack-bridging constitutive relations, strain-rate effects, regularization of damage evolution parameters, and parameters scaling method for wide-range strength of materials were all considered and carefully discussed. The calibrated parameters were validated using low-velocity drop-weight impact tests, near-field explosion tests, and high-speed penetration tests. In this study, the traditional element erosion method and meshless/particle methods of Smoothed Particle Galerkin (SPG) method were used for failure analysis in penetration and explosion models. The results show that the calibrated parameters accurately predict the cratering and scabbing diameters and failure modes of explosion tests with the element erosion method. Furthermore, the residual velocity of the projectile and crack patterns of targets were also predicted with good precision with both element erosion and SPG methods. However, in the simulations of low-velocity impact tests, the predictions of maximum deflection were acceptable, and the errors in residual deflection were significant due to the inherent weakness of the material constitutive model.
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tags:
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- Source Themes
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featured: false
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links:
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# - type: pdf
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# url: http://arxiv.org/pdf/1512.04133v1
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caption: 'Image credit: [**Unsplash**](https://unsplash.com/photos/jdD8gXaTZsc)'
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# Associated Projects (optional).
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# Associate this publication with one or more of your projects.
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# Simply enter your project's folder or file name without extension.
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# E.g. `internal-project` references `content/project/internal-project/index.md`.
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# Otherwise, set `projects: []`.
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projects: []
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# Slides (optional).
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# Associate this publication with Markdown slides.
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# Simply enter your slide deck's filename without extension.
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# E.g. `slides: "example"` references `content/slides/example/index.md`.
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# Otherwise, set `slides: ""`.
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slides: ""
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---

‎content/publications/JOBE2023/cite.bib‎

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@article{Yin2023b,
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author = {Yin, Xing and Li, Qinghua and Wang, Qingmin and Chen, Bokun and Xu, Shilang},
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doi = {10.1016/j.jobe.2023.106902},
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issn = {23527102},
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journal = {Journal of Building Engineering},
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month = {may},
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pages = {106902},
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title = {{Experimental and numerical investigations on the stress waves propagation in strain-hardening fiber-reinforced cementitious composites: Stochastic analysis using polynomial chaos expansions}},
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url = {https://linkinghub.elsevier.com/retrieve/pii/S2352710223010811},
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volume = {74},
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year = {2023}
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}

‎content/publications/JOBE2023/index.md‎

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---
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title: "Experimental and numerical investigations on the stress waves propagation in strain-hardening fiber-reinforced cementitious composites: Stochastic analysis using polynomial chaos expansions"
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authors:
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- yinxing
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- Qinghua Li*
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- Qingmin Wang
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- Bokun Chen
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- Shilang Xu
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# author_notes:
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# - "Equal contribution"
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# - "Equal contribution"
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date: "2023-09-01T00:00:00Z"
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# Publication type.
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# Accepts a single type but formatted as a YAML list (for Hugo requirements).
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# Enter a publication type from the CSL standard.
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publication_types: ["article-journal"]
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# Publication name and optional abbreviated publication name.
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publication: "***Journal of Building Engineering***, 74, 106902"
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abstract: The propagation of stress waves can result in spalling fractures in materials, which poses a threat to the safety of engineering structures. Hence, in-depth studies are necessary to mitigate such risks. Ultra-high toughness cementitious composites (UHTCC) with significant tensile strain-hardening properties are advanced engineering materials with great potential for impact engineering. The study used a combination of experimental and numerical methods to analyse the propagation and attenuation behaviour of stress waves in the UHTCC. The numerical model was developed using the Smooth Particle Galerkin (SPG) method and the Karagozian & Case concrete/cementitious (KCC) material constitutive model. Additionally, a quantitative global sensitivity analysis (GSA) using a polynomial chaos expansion (PCE) surrogate model and Sobol's method was conducted to analyse the stochastic input parameters of the numerical model. Results show that compressive stress waves undergo significant attenuation during propagation in UHTCC, and the developed numerical model accurately simulated the stress wave propagation process Furthermore, the PCE-Sobol GSA revealed that the selected stress wave propagation responses are most sensitive to the tensile strength of UHTCC. This study is expected to deepen the understanding of the propagation behaviour of stress waves in UHTCC and pave the way for promising applications of UHTCC in impact engineering.
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tags:
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- Source Themes
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featured: false
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links:
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# url: http://arxiv.org/pdf/1512.04133v1
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url: "https://doi.org/10.1016/j.jobe.2023.106902"
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# url: ""
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# Featured image
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# To use, add an image named `featured.jpg/png` to your page's folder.
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image:
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caption: 'Image credit: [**Unsplash**](https://unsplash.com/photos/jdD8gXaTZsc)'
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focal_point: ""
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preview_only: false
52+
53+
# Associated Projects (optional).
54+
# Associate this publication with one or more of your projects.
55+
# Simply enter your project's folder or file name without extension.
56+
# E.g. `internal-project` references `content/project/internal-project/index.md`.
57+
# Otherwise, set `projects: []`.
58+
projects: []
59+
60+
# Slides (optional).
61+
# Associate this publication with Markdown slides.
62+
# Simply enter your slide deck's filename without extension.
63+
# E.g. `slides: "example"` references `content/slides/example/index.md`.
64+
# Otherwise, set `slides: ""`.
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slides: ""
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---

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