Numerical study on crack propagation under explosive loads

Chuan-jin, PU; Yang, Xin; Zhao, Han; Chen, Zhenlin; Xiao, Dingquan; Zhou, Changlin; Xue, Bing

doi:10.1007/s10409-021-09036-x

Cited by 8 publications

(2 citation statements)

References 29 publications

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“…Some scholars have conducted studies on crack problems under explosive loads. Chuanjin Pu [7] used Autodyn software 18.0 to study the crack propagation of plexiglass (PMMA) materials under explosive loads. By introducing a tensile fracture softening failure model, he obtained the crack propagation characteristics under single-hole and double-hole drilling conditions.…”

Section: Introductionmentioning

confidence: 99%

A Study on Crack Initiation and Propagation of Welded Joints under Explosive Load

Ding,

Gong,

Sun

et al. 2024

JMSE

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Welded joints in naval ship hull structures are weak areas under explosive load, but there are relatively few studies investigating the failure characteristics of welded joints through dynamic fracture and explosion tests. In order to explore and predict the failure characteristics of welded joints under explosive load, instrumented Charpy impact tests, explosion tests, and numerical simulations were carried out. The dynamic fracture toughness of ultra-high strength ship hull structural steel welded joints was obtained, and the dynamic stress intensity factors, together with the correlation between stress wave and crack propagation at different positions, were acquired. The results showed that the stress state at the crack tip of a Charpy impact specimen was consistent with that of a welded joint under explosive loads, and the crack initiated when the dynamic stress intensity factor exceeded the dynamic fracture toughness. The results indicated that the dynamic fracture toughness obtained by instrumented Charpy impact tests could be used to predict the crack initiation characteristics of welded structures under explosive load, and the stress wave at the crack tip was basically perpendicular to the crack propagation surface and promoted the rapid propagation of cracks.

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Section: Introductionmentioning

confidence: 99%

A Study on Crack Initiation and Propagation of Welded Joints under Explosive Load

Ding,

Gong,

Sun

et al. 2024

JMSE

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“…When the stress wave propagates to the control hole wall, it is reflected, and the reflected tensile wave and the stress field at the radial crack tip are superimposed on each other to promote crack expansion. When the crack expands near the control hole, the dynamic stress intensity factor of the main crack tip increases, which makes it play the role of energy gathering and guiding and controlling the crack in the blasting process [18,19]. Blasting crack surface appears along the core line of blasting hole and control hole, which is proved by theoretical research and field engineering practice.…”

Section: Introductionmentioning

confidence: 99%

Porous Blasting Morphology and Resistivity Response Characteristics of Soft Coal Seam

Yang

Zhao

et al. 2022

Shock and Vibration

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The fracturing characteristics of multi-holes blasting in soft coal seam were analyzed quantitatively by using the multi-holes model blasting experiment of soft coal seam and digital image processing (DIP) and electrical resistivity tomography (ERT) techniques, and the electrical resistivity response rules before and after blasting were obtained. The results show the following: (1) At the same time as the formation of blasting-induced cracks, the coal inside the control hole presents two kinds of displacement phenomena: crack and noncrack, partially offsetting the extrusion effect caused by the expansion of the blasting hole. (2) The comprehensive value (S) of blasting-induced cracks, control hole, and blasting hole area change is proposed to analyze the blasting effect. When single-hole blasting is performed, S < 0, the fractal dimension change rate of coal seam crack is only 5%, the control area presents a compaction phenomenon, and the resistivity decreases by about 20%. When multi-hole blasting is performed, the blasting cracks are abundant and the coal displaces sufficiently. The fractal dimension of cracks reaches 21.28%, the negative effect of the blast holes cavity is offset (S > 0), and the resistivity in the controlled area generally increases by 1 to 30 times. (3) Compared with the single-hole blasting model, the multi-hole blasting is more in line with the coal mine site, and can effectively increase the permeability in the control area, and the resistivity generally increases.

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