Effects of vertical and horizontal reflected blast stress waves on running cracks by caustics method

Qiu, Peng; Yue, Zhongwen; Yang, Renshu; Li, Jianchun

doi:10.1016/j.engfracmech.2019.03.018

Cited by 33 publications

(12 citation statements)

References 28 publications

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“…The results also showed that the direction of impact loading was another factor affecting the bone damage. The propagation of stress waves changed with the direction of impact loading influencing the pattern of bone damage consequently 27,28 . When the impact force was vertically loaded, although the stress wave propagated and dispersed in the direction of loading, trabecular bone damage at the bottom of the implant and the failure of bonding interface had been alleviated by the cortical bone.…”

Section: Discussionmentioning

confidence: 99%

Simulation analysis of impact damage to the bone tissue surrounding a dental implant

Diao¹,

Li²,

Xin³

et al. 2020

Sci Rep

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Dental implant may suffer transient external impacts. To simulate the effect of impact forces on bone damage is very important for evaluation of damage and guiding treatment in clinics. In this study, an animal model was established by inserting an implant into the femoral condyle of New Zealand rabbit. Implant with good osseointegration was loaded with impact force. A three-dimensional finite element model was established based on the data of the animal model. Damage process to bone tissue was simulated with Abaqus 6.13 software combining dynamic mechanical properties of the femur. The characteristics of bone damage were analyzed by comparing the results of animal testing with numerical simulation data. After impact, cortical bone around the implant and trabecular at the bottom of the implant were prone to damage. The degree of damage correlated with the direction of loading and the magnitude of the impact. Lateral loading was most likely performed to damage cancellous bone. The stress wave formed by the impact force can damage the implant-bone interface and periimplant trabeculae. The data from numerical simulations were consistent with data from animal experiments, highlighting the importance of a thorough examination and evaluation based on the patient's medical history.

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Section: Discussionmentioning

confidence: 99%

Simulation analysis of impact damage to the bone tissue surrounding a dental implant

Diao¹,

Li²,

Xin³

et al. 2020

Sci Rep

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show abstract

“…e test method used in this study also has shortcomings, which may be remedied by further research. For example, gypsum with uniform, isotropic, and homogeneous characteristics was used as the test material; the anisotropy and nonuniformity of the rock mass were ignored, which should be considered in the future, and the effect of reflected stress wave on the rock damage is not considered [32]. Additionally, the explosive charge we used in the test is a uniform self-made charge and the charging parameters, detonation time, and detonation conditions were kept uniform.…”

Section: Effect Of In Situ Stress On Crack Propagationmentioning

confidence: 99%

In Situ Stress Effects on Smooth Blasting: Model Test and Analysis

Yang

Fang

Yang

et al. 2020

Shock and Vibration

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Most of the roadway excavation is completed by the drilling and blasting method. With the increase of buried depth, the existence of ground stress will generate a significant impact on the rock blasting, especially on the smooth blasting. In this study, self-made homogeneous similar materials and digital image correlation methods were used to determine influence of ground stress on the smooth blasting under uniform explosive charge parameters and various in situ stress conditions. The results show that the crack outline after blasting changes from zigzag to straight in shape, and multifractal calculation results of the rupture section between blastholes show that the fracture surface becomes flatter as ground stress increases, which is conducive to roadway formation. The strain and equivalent strain rate obviously decrease as the distance between the blasthole and measuring points increases. The same trend occurs as the confining pressure goes up. Meanwhile, a postexplosion acoustic wave test indicates that confining pressure inhibits damage of the retained rock, which is consistent with strain and equivalent strain rate results. Finally, we discussed the crack propagation mechanism of rock in smooth blasting.

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“…e slope of the regression line in a double logarithm coordinate system of y i ∼ (x i /x m ), which can be established by equation (11), is b � 3 − D f . In this way, the fractal dimension of fragmentation degree (D f ) can be calculated [24].…”

Section: Shock and Vibrationmentioning

confidence: 99%

“…In fact, the discontinuous interfaces such as joints, cracks, holes, and weak surfaces widely existing in the rock are the most critical factors affecting the rock blasting fracture effect [10][11][12]. Hence, there is inevitable error between the calculation results in rock blasting design and the actual blasting effect in a certain range caused by these factors.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Fractal Dimension of Fragmentation Degree and Energy Dissipation of Rock-Like Materials under Initial Stress

et al. 2020

Shock and Vibration

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In order to obtain the relationship between fractal dimension and energy dissipation of rock-like materials under initial stress state, a variable cross-section split Hopkinson pressure bar (SHPB) test system with active confining pressure loading device was used to carry out impact compression and splitting tests on cemented sand specimens. The impact test results show that (1) the prediction value on the fragmentation degree of cemented sand specimens by using the fractal model is basically consistent with the screening results of actual test, which verifies the applicability of the fractal calculation model given in this study; (2) the more the fracture energy dissipated in the crushing process of cemented sand specimens, the more serious the fragmentation degree is, and accordingly the larger the fractal dimension is, that is, the fracture energy is positively correlated with the fractal dimension; (3) there is an exponential relationship between the fractal dimension and energy dissipation of cemented sand specimens under initial stress, which is so different from that under no initial stress. The experimental results in this study can be used to modify the fractal damage model for rock blasting considering the initial stress.

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Effects of vertical and horizontal reflected blast stress waves on running cracks by caustics method

Cited by 33 publications

References 28 publications

Simulation analysis of impact damage to the bone tissue surrounding a dental implant

Simulation analysis of impact damage to the bone tissue surrounding a dental implant

In Situ Stress Effects on Smooth Blasting: Model Test and Analysis

Relationship between Fractal Dimension of Fragmentation Degree and Energy Dissipation of Rock-Like Materials under Initial Stress

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