Improved concept for iterative crack propagation using configurational forces for targeted angle correction

Frankl, Siegfried Martin; Pletz, Martin; Schuecker, Clara

doi:10.1016/j.engfracmech.2022.108403

Cited by 9 publications

(1 citation statement)

References 21 publications

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“…Subsequently, to study the influences of strain rate and temperature on crack development, a two-dimensional particle flow code (Itasca Consulting Group Inc, 2008) was utilized to numerically simulate the SHPB experiment, and the parameters and geometric model in the simulation were calibrated and validated by comparing the results obtained numerically with the results obtained experimentally. Finally, as a lot of cracks may initiate between each particle in the frozen soil under high-velocity impact loading within a short period of time, conventional analyses of the crack development were not adopted in the study, such as crack propagation velocity (Wu et al., 2020), crack opening displacement (Wang et al., 2021b), and crack angle (Frankl et al., 2022). The changes in cracks with time are presented in a more intuitive manner.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation research on impact mechanical properties of frozen soil based on discrete element method

Chunyu

Zhu

et al. 2022

International Journal of Damage Mechanics

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Many engineering activities have been conducted on permafrost. Frozen soil is subjected to impact loading, particularly during blasting and excavation projects. Thus, it is essential to study the impact mechanical properties of frozen soil. A split Hopkinson pressure bar (SHPB) experiment was conducted to investigate the mechanical responses of frozen soil specimens subjected to impact loading under different strain rates at different temperatures. Evident strain rate and temperature effects were also observed. As crack development in the specimens could not be observed experimentally, a two-dimensional particle flow code was utilized to numerically simulate SHPB impact experiments on frozen soil. A contact bonding model was used for the simulation. We assumed that only temperature could change the particle parameters. The parameters and establishment of the geometric model in the simulation were calibrated and validated by comparing them with the experimentally obtained impact stress–strain curves and wave signals. More influences of strain rate and temperature on crack development were presented intuitively in this study, in combination with the propagation of stress waves. The results of the numerical simulation demonstrated that when the frozen soil specimen was subjected to impact loading, shear failure was the primary failure in the specimen. For a given temperature, a lower strain rate decreased the number of cracks generated, increased the duration of crack generation, and delayed the formation of cracks. For a given strain rate, a lower temperature decreased the number of cracks generated and the duration of crack generation; however, the number of tensile cracks was negligibly affected by changes in temperature.

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Section: Introductionmentioning

confidence: 99%