On the numerical evaluation of the anvil force for accurate dynamic stress intensity factor determination

Rokach, I. V.

doi:10.1016/s0013-7944(02)00256-4

Cited by 8 publications

(5 citation statements)

References 8 publications

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“…In many situations, the stress intensity factor (SIF) is used to predict the stress state near the crack tip [122][123][124][125]. In dynamic loading, SIF is reinstated by the dynamic stress intensity factor (DSIF) [126][127][128][129][130][131][132][133]. In thermal loading condition, several literatures [123,[134][135][136][137][138][139][140][141][142][143][144][145][146][147][148] used thermal stress intensity factor (TSIF) to determine the thermal stress state.…”

Section: Challenge-4: Quantification Of Cracksmentioning

confidence: 99%

“…Aloui et al [127] studied the dynamic vibration behaviour of a cracked plate subjected to sinusoidal loading and analysed the stress field and dynamic stress intensity factor. Rokach [132] numerical investigation on the accuracy in the determination of dynamic stress intensity. Wen et al [155] studied the dynamic behaviour of stationary cracks using dual boundary methods and determined the dynamic stress intensity factor through crack opening displacement.…”

Section: Challenge-4: Quantification Of Cracksmentioning

confidence: 99%

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Current challenges in modelling vibrational fatigue and fracture of structures: a review

Kamei

Khan

2021

J Braz. Soc. Mech. Sci. Eng.

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Fatigue damage is a concern in the engineering applications particularly for metal structures. The design phase of a structure considers factors that can prevent or delay the fatigue and fracture failures and increase its working life. This paper compiled some of the past efforts to share the modelling challenges. It provides an overview on the existing research complexities in the area of fatigue and fracture modelling. This paper reviews the previous research work under five prominent challenges: assessing fatigue damage accurately under the vibration-based loads, complications in fatigue and fracture life estimation, intricacy in fatigue crack propagation, quantification of cracks and stochastic response of structure under thermal environment. In the conclusion, the authors have suggested new directions of work that still require comprehensive research efforts to bridge the existing gap in the current academic domain due to the highlighted challenges.

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Section: Challenge-4: Quantification Of Cracksmentioning

confidence: 99%

Section: Challenge-4: Quantification Of Cracksmentioning

confidence: 99%

Current challenges in modelling vibrational fatigue and fracture of structures: a review

Kamei

Khan

2021

J Braz. Soc. Mech. Sci. Eng.

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“…He used an analytical solution for the indentation-contact force relationship between a beam and a rigid cylindrical indenter. Rokach (2003b) also proposed a numerical method for evaluating the anvil forces based on measured striker force and calculated specimen model parameters. It was assumed that the contact can be described by the quasi-static Hertz's theory.…”

Section: A Model Of the Tpb Impact Test With A Contact Proceduresmentioning

confidence: 99%

“…A numerical study (Rokach, 2000) used only a rigid striker and a rigid anvil to model the k d curves reported in (Böhme, 1995). More recently, (Rokach, 2003a;Rokach, 2003b) studied the effect of the contact stiffness in modelling of impact tests, but, as explained in Section 3, various approximations as regard the contact were employed, whereas in the current work the contact received complete numerical treatment. Following the results from the mass spring model studies an investigation of the influence of the contact stiffness was performed by using the contact procedure.…”

Section: The Model With a Contact Proceduresmentioning

confidence: 99%

Numerical Analysis of the Three Point Bend Impact Test for Polymers

2005

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The three point bend impact test is analysed by employing the finite volume method. Numerical modelling was necessary to enhance understanding of the test and to obtain dynamic correction functions, which are convenient to calculate K and G from measured time to fracture. A simple model of the three point bend test and a more sophisticated model, which included contact effects, were analysed. A good fit with experiments was found when using the contact model. The anvils were found to be important only at a late stage in the test. Several test parameters were varied to investigate their influence on the dynamic correction function. The contact stiffness was found to have an important influence on the shape of the dynamic correction function. Due to the nonlinear contact stiffness the impact velocity also affects the dynamic correction function. For a polymer specimen and a steel striker the specimen width and the specimen material were found to have only a small influence on the dynamic correction function. The dynamic correction function for G was found to exhibit higher oscillations than the dynamic correction function for K as expected, and hence the former is a more sensitive parameter.

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“…There are also a lot of numerical methods for describing the behavior of cracked bodies under impulse load. In [11], using finite element analysis to evaluate reaction force in threepoint bend specimens, the effect of time step length, the number of considered eigenmodes, and specimen overhang on the achieved anvil force and DSIF were investigated. The meshless finite block method used for the calculation of mixed-mode dynamic stress intensity factors is introduced in [12].…”

Section: Introductionmentioning

confidence: 99%

Determination of Stress Intensity Factors under Shock Loading Using a Diffraction-Based Technique

et al. 2021

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An experimental optical method has been developed for the measurement of opening and sliding notch face movements. The light passing through a thin slit is monitored by a photodiode detector. Two parts of the slit are fixed independently on the notch faces of the simulated crack. Dynamic variations of the notch face movements are recorded as an electric signal by an ‘oscilloscope. The sensitivity of such displacement measurement is comparable with the wavelength of light. Dynamic mixed-mode stress intensity factors under shock loading were evaluated from the data obtained and subsequently compared with a numerical simulation by ANSYS software. As it was approved, the technique has shown sufficient sensitivity, good linearity, and measurement reliability. Due to its non-destructive nature and overall robustness, the arrangement is applicable even for structural component condition determination taking into consideration potentially unknown boundary conditions and the non-linear character of mechanical parameters.

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On the numerical evaluation of the anvil force for accurate dynamic stress intensity factor determination

Cited by 8 publications

References 8 publications

Current challenges in modelling vibrational fatigue and fracture of structures: a review

Current challenges in modelling vibrational fatigue and fracture of structures: a review

Numerical Analysis of the Three Point Bend Impact Test for Polymers

Determination of Stress Intensity Factors under Shock Loading Using a Diffraction-Based Technique

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