Dynamic fracture analysis by explicit solid dynamics and implicit crack propagation

Crump, Timothy; Ferté, Guilhem; Jivkov, Andrey P.; Mummery, Paul; Tran, Van-Xuan

doi:10.1016/j.ijsolstr.2017.01.035

Cited by 14 publications

(11 citation statements)

References 34 publications

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“…Crack growth starts at a nonzero crack speed V i . During crack growth, the crack speed V is related to the energy release rate G according to a phenomenological relation which possesses three features: (1) the crack speed has an asympototic maximum value V m [46,47]; (2) the V(G) curve has a positive slope, representing the influence of increased microcracking on the fracture toughness [7,46,48]; (3) the crack speed jumps from a finite value V a to zero when the energy release rate drops below the crack arrest toughness G a [49]. The crack initiation point is not on the curve characterizing the dynamic crack growth criterion is possibly due to bluntness of the initial crack, intrinsic rate dependence of the material, or inertia effects [46].…”

Section: Crack Speedmentioning

confidence: 99%

Cohesive zone and interfacial thick level set modeling of the dynamic double cantilever beam test of composite laminate

Liu

Meer

Sluys

2018

Theoretical and Applied Fracture Mechanics

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The mode-I interlaminar fracture toughness of composite laminates under different loading rates can be measured by the double cantilever beam (DCB) test. It is observed from the DCB test of a unidirectional PEEK/carbon composite laminate that as the loading rate increases from quasi-static to dynamic range: (1) delamination crack growth exhibits a transition from stable to unstable ("stick/slip") and back to a stable type; (2) the interlaminar fracture toughness is not constant as the loading rate increases. In this paper, two numerical approaches are used to reproduce the experimental observations: a cohesive zone model (CZM) and the interfacial thick level set (ITLS) model. CZM simulations with rate-independent and rate-dependent cohesive laws are carried out. A new version of the ITLS is introduced with a phenomenological relation between crack speed and energy release rate. The simulation results of the CZM and the ITLS model are compared with the real DCB test data to evaluate the capability of these two types of models. It is found that the used CZM can reproduce rate-dependence of the fracture energy, but not the stick/slip behavior. The ITLS can capture the stick/slip behavior, but needs different parameter sets for different loading rates.

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Section: Crack Speedmentioning

confidence: 99%

Cohesive zone and interfacial thick level set modeling of the dynamic double cantilever beam test of composite laminate

Liu

Meer

Sluys

2018

Theoretical and Applied Fracture Mechanics

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“…Then the determined K 0 I (t) and the corresponding velocity are substituted into Eqs. (9) and (1), the crack propagation DSIF, K d I (t), can be acquired. In addition, the crack propagating velocity v(t) used in the calculation process is the crack extending velocity corrected by the fractal method.…”

Section: Calculation Methods Of Dsifsmentioning

confidence: 99%

“…Recently the fracture characteristics in a pre-existing crack rock under impact loads have been discussed in many research works [7][8][9][10][11][12][13][14][15][16][17]. A large number of investigations based on laboratory experimental tests have been conducted to study the mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Rock Dynamic Crack Propagation Behaviour and Determination Method with Improved Single Cleavage Semi-circle Specimen Under Impact Loads

Wang

Zhu

et al. 2020

Acta Mech. Solida Sin.

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This paper studied the rock dynamic fracture propagation under impact loads elaborately with a determination method proposed to calculate crack propagation dynamic stress intensity factor (DSIF). By utilizing the split-Hopkinson pressure bar, the impact experiments with an improved single cleavage semicircle (ISCSC) specimen were conducted to illuminate the dynamic crack propagation behaviour. Meanwhile, the fracture characteristics and crack propagation velocity were obtained by the crack propagation gauges. Coordinating experiments with a numerical approach, the crack propagation dynamic stress intensity factors were calculated by an experimental-numerical method with fractal theory. Then, a finite difference model was developed based on the tensile fracture softening damage criterion. With the analysis of numerical and experimental results, the crack propagation behaviour and mechanism of crack arrest were discussed sophisticatedly. The results demonstrate that the novel ISCSC specimen shows a definite advantage in determining crack propagation and arrest DSIF. Additionally, the crack arrest DSIF is larger than the average propagation DSIF with a sharp increase. Meanwhile, the numerical simulation results which agree well with the actual crack propagation illustrate that the crack arrest should be dominated by the compressive stress perpendicular to the crack path, and there were several arrest pauses existing in the transitory crack arrest process.

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“…An implicit solver was used for the finite element analysis. Implicit solutions are based on quantities calculated in the previous time step (backward Euler time scheme), which means even for large time steps the solution remains stable (unconditionally stable) [41]. In modeling fracture mechanics for laminated composite where both tensile and shear failure are common, a fracture criterion for predicting mode I, mode II, and mixed-mode I/II fracture onset is needed.…”

Section: Finite Element Analysismentioning

confidence: 99%

The Fracture Behavior of Pure and Hybrid Intraply Knitted Fabric-Reinforced Polymer Composites

Balcıoğlu¹,

Özmen²

2020

Fracture Mechanics Applications

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Due to the high synergistic effects of the components, hybrid composite materials are more advantageous than nonhybrid composite materials for advanced engineering applications. Additionally, knitted fabrics may have a different behavior than woven ones. Although the nonhybrid composites have only one reinforcing fiber type, the hybrid composites have multiple reinforcing fibers. In this chapter, fracture characterizations of laminated composites reinforced with intraply pure and hybrid knitted fabrics are experimentally and numerically investigated under different loading conditions. For this purpose, pure (100%) and hybrid fabrics (50-50%), which have 1 Â 1 rib-knitted structure, were knitted by using glass and carbon fibers. Also, hybrid fabrics were knitted in three different widths in order to investigate the effect of knitting pattern width on the fracture toughness. Fracture toughness and energy strain release rates of pure and hybrid Arcan test specimens were determined under mode I (0 o), mixed-mode I/II (30 o ,45 o ,and60 o), and mode II (90 o) loading conditions. Also, the J-integral method was used to determine the fracture toughness. Experimental and numerical results were found to be consistent. When the results obtained from pure and hybrid fabrics are compared, it is seen that hybridization had positive effects on the fracture strength of composite material compared to pure glass/epoxy material. Additionally, as the width of the pattern decreased, the fracture strength of the hybrid composites increased. In this respect, the hybridization processing should be done in the narrowest pattern width for higher resistance to fracture.

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Dynamic fracture analysis by explicit solid dynamics and implicit crack propagation

Cited by 14 publications

References 34 publications

Cohesive zone and interfacial thick level set modeling of the dynamic double cantilever beam test of composite laminate

Cohesive zone and interfacial thick level set modeling of the dynamic double cantilever beam test of composite laminate

Rock Dynamic Crack Propagation Behaviour and Determination Method with Improved Single Cleavage Semi-circle Specimen Under Impact Loads

The Fracture Behavior of Pure and Hybrid Intraply Knitted Fabric-Reinforced Polymer Composites

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