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An FE Simulation of the Fracture Characteristics of Blunt Rock Indenter Under Static and Harmonic Dynamic Loadings Using Cohesive Elements

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Abstract

This paper aims to study the fracture characteristics of blunt indenter impacting formation under static and harmonic dynamic loads by carrying out a series of FE numerical simulations. The methodology of globally embedding cohesive elements with zero-thickness is introduced based on its constitutive response. Subsequently, the secondary development of FE simulation is carried out, and the 3D simulation of random initiation and propagation of formation without preset crack under compressive loads is realized. Two key parameters (amplitude and frequency) of dynamic load are considered, three fracture characteristic parameters (crack element number, crack area and crack volume) of formation are discussed, and the process and morphology of formation fracture and the impact velocity and displacement of blunt indenter under static–dynamic loads are investigated, respectively. Based on the analysis undertaken, it can be concluded that the harmonic dynamic load can promote crack propagation and connection. The amplitude of harmonic dynamic load is beneficial to the formation fracture, and the influence of loading frequency on it still needs to be further discussed. The impact velocity of blunt indenter changes in a harmonic form and the impact displacement increases in a fluctuating form under static–dynamic loads. The research results are of great significance for optimizing drilling parameters and designing speed-increasing tools.

Highlights

  • The methodology of globally embedding cohesive element with zero-thickness is introduced based on constitutive response.

  • The secondary development of FE simulation is conducted, which can realize random initiation and propagation of formation without preset crack under compressive loads and extract fracture characteristic parameters.

  • The 3D simulation model of blunt indenter impacting formation is proposed and the fracture process of formation under static and static-dynamic loads is compared.

  • Two key parameters (amplitude and frequency) of harmonic dynamic load are considered and three fracture characteristic parameters (crack element number, crack area and crack volume) of formation are discussed.

  • The process and morphology of formation fracture and the impact velocity and displacement of blunt indenter under static-dynamic loads are investigated.

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The data presented in this study are available on request from the corresponding author.

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Acknowledgements

The authors would like to acknowledge the support of Funding Project of Overseas Returnees and Youth Innovative Talent Cultivation Program (UNPYSCT-2020151) of Heilongjiang Province, Funds for Reform and Development from Central Government and Postdoctoral Special Funding Project of Heilongjiang Province (LBH-TZ2101).

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Correspondence to Siqi Li.

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Li, S., Chen, Z., Li, W. et al. An FE Simulation of the Fracture Characteristics of Blunt Rock Indenter Under Static and Harmonic Dynamic Loadings Using Cohesive Elements. Rock Mech Rock Eng 56, 2935–2947 (2023). https://doi.org/10.1007/s00603-022-03214-x

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  • DOI: https://doi.org/10.1007/s00603-022-03214-x

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