Evaluation of mode 1 stress intensity factor for edge crack using displacement extrapolation method

Kirthan, L J; Hegde, Ramakrishna N.; Girisha, V.A.; Kumar, Ram

doi:10.1504/ijmsi.2016.079651

Cited by 6 publications

(3 citation statements)

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“…Zhou and Xue [18] utilized the displacement-extrapolation method for extracting SIFs. Moreover, The same method was employed to calculate the SIF by measuring the displacements at the near-tip nodes and crack length in a 3-D cracking problem [19,20].…”

Section: Introductionmentioning

confidence: 99%

Solidification Crack Evolution in High-Strength Steel Welding Using the Extended Finite Element Method

2020

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High-strength steel suffers from an increasing susceptibility to solidification cracking in welding due to increasing carbon equivalents. However, the cracking mechanism is not fully clear for a confidently completely crack-free welding process. To present a full, direct knowledge of fracture behavior in high-strength steel welding, a three-dimensional (3-D) modeling method is developed using the extended finite element method (XFEM). The XFEM model and fracture loads are linked with the full model and the output of the thermo-mechanical finite element method (TM-FEM), respectively. Solidification cracks in welds are predicted to initiate at the upper tip at the current cross-section, propagate upward to and then through the upper weld surface, thereby propagating the lower crack tip down to the bottom until the final failure. This behavior indicates that solidification cracking is preferred on the upper weld surface, which has higher weld stress introduced by thermal contraction and solidification shrinkage. The modeling results show good agreement with the solidification crack fractography and in situ observations. Further XFEM results show that the initial defects that exhibit higher susceptibility to solidification cracking are those that are vertical to the weld plate plane, open to the current cross-section and concentratedly distributed compared to tilted, closed and dispersedly distributed ones, respectively.

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Section: Introductionmentioning

confidence: 99%

Solidification Crack Evolution in High-Strength Steel Welding Using the Extended Finite Element Method

2020

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“…Leak through interface of any two surfaces can occur in different environments and loading conditions due to different reasons and researchers have separately devised methods to predict failures in each of these cases. For example, leakage of high pressure fluid through pipes of nuclear power plants is studied as a crack propagation problem and the pipes are designed to leak before breaking (Moan et al, 1990;Takahashi, 2002;Kirthan et al, 2016). However, leak and failure in elastomeric seal systems due to corrosive environments and prolonged service time is studied as a material degradation problem using accelerated aging tests (Gillen et al, 2003;Liu et al, 2017;ISO 23936-2, 2011).…”

Section: Introductionmentioning

confidence: 99%

Experimental characterisation of leak through elastomer-metal interface

Sudhamsu¹,

Rao²,

Deshpande³

et al. 2019

IJMSI

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Elastomeric seals are devices that are widely used to prevent fluid leakage through the interface of mating parts. In this paper, we study the leak characteristics of a representative elastomeric seal system using an experimental setup that has been developed to measure the leak rate of gas through an elastomer-metal interface as a function of sealing load intensity and fluid pressure. These experiments are carried out on nitrile butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR) and fluoro-elastomer (FKM) specimens using nitrogen gas at pressures ranging from 40 kPa to 800 kPa. The experiments revealed that the leak rate increases rapidly with gas pressure and decreases with sealing load intensity. When leak rate was plotted against normalised gas pressure, it was observed that all the data points fall reasonably on one single curve irrespective of sealing load intensity and the material. These results will be useful for further analysis in developing a mathematical model for characterising fluid leak through elastomer-metal alloy interfaces.

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“…Also, Pais (2012) explains the concept and methodology of enrichment in details based on the concept of PUM and LSM with XFEM for modelling cracks, holes, and inclusions using MATLAB. Also, Kirthan et al (2016) have evaluated SIFs Mode-I crack propagation for different crack lengths using a compact specimen using displacement extrapolation method. Using FEM, Fajdiga and Zafošnik (2015) apply the maximum energy release rate criterion, of the minimum strain energy density (SED) criterion and of the maximum tangential stress (MTS) criterion for evaluating the kink angles for the propagation of the crack in different loading modes.…”

Section: Introductionmentioning

confidence: 99%

Mixed mode stress intensity factors of slanted edge cracked plate with hole subjected to various in-plane loadings using XFEM

Khatri

Lal

2019

IJMSI

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This manuscript presents the fracture behaviour of a slanted edge cracked plate with a circular hole subjected to various in-plane loadings, such as tensile, shear and combined (tensile and shear) loadings, through the mixed mode stress intensity factors (MMSIF). There is a lack of work in the direction of calculating the fracture behaviour of the slanted crack under the influence of a hole subjected to the various in-plane loadings. In this work, the crack is modelled using extended finite element method (XFEM) under plane strain condition using MATLAB. The MMSIFs are increased with the increment in the crack length but as the crack angle is increased the Mode-I SIFs are decreased whereas Mode-II SIFs are increased. The SIFs are critical for the plate with a hole as compared to the plate without a hole. The values of MMSIFs are the highest for the plate under combined loading and the least under tensile loading.

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Evaluation of mode 1 stress intensity factor for edge crack using displacement extrapolation method

Cited by 6 publications

References 0 publications

Solidification Crack Evolution in High-Strength Steel Welding Using the Extended Finite Element Method

Solidification Crack Evolution in High-Strength Steel Welding Using the Extended Finite Element Method

Experimental characterisation of leak through elastomer-metal interface

Mixed mode stress intensity factors of slanted edge cracked plate with hole subjected to various in-plane loadings using XFEM

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