Experimental Determination Technique of Stress Intensity Factor and Its Application

Itoh, Yoshiyasu; Murakami, T.; Kashiwaya, Hideo

doi:10.1115/1.3226437

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Where A 0 , A 1 and B 0 are unknown coefficients which can be determined by using the specimen geometry and boundary conditions. Using the definition of K I , one can easily show that it is related to A 0 by [2][3][4][5][6][7][8][9][10][11]:…”

Section: Basic Theory and Mathematical Formulation Of The Modelmentioning

confidence: 99%

A New FEM Approach for the Determination of Fracture Parameters in Polymethyl-metacrylate PMMA

Khelil¹,

Belhouari²,

Aour³

et al. 2015

mst

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The experimental results from the blocks loading fatigue tests are compared with the predictions using the proposed model and Miner's rule. Estimated and experimental results are found to exhibit good agreement. The evaluation technique of the K I stress intensity factors (SIF) by a numerical investigation using line strain method is developed. The main purpose of this research is to estimate experimental results of fracture loads from polymethyl-metacrylate (PMMA) specimens (fully finite plates). Stress intensity factor equation calculation is derived from the Williams stress asymptotic expansion. Computed values using finite element analysis of stress intensity factors are compared with the experimental and theoretical results. A good agreement is observed between the present approach and experimental data. It is shown that, in the case of a through-plate crack, the stress intensity factor can be measured with a good accuracy using the proposed method.

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Section: Basic Theory and Mathematical Formulation Of The Modelmentioning

confidence: 99%

A New FEM Approach for the Determination of Fracture Parameters in Polymethyl-metacrylate PMMA

Khelil¹,

Belhouari²,

Aour³

et al. 2015

mst

View full text Add to dashboard Cite

show abstract

“…A specified strain gage pattern has been proposed to measure the stress intensity factors of mixed mode problems [6]. Moreover, different strain gage approaches have been introduced to measure the variation of stress intensity factor of a propagating crack [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A Numerical Approach for the Determination of Mode I Stress Intensity Factors in PMMA Materials

Khelil¹,

Belhouari²,

Benseddiq³

et al. 2014

Eng. Technol. Appl. Sci. Res.

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An evaluation technique of the KI stress intensity factors (SIF) by a numerical investigation using line strain method is presented in this paper. The main purpose of this research is to re-analyze experimental results of fracture loads from polymethyl-metacrylate (PMMA) specimens (fully finite plates). Stress intensity factor equation calculation is derived from the Williams stress asymptotic expansion. Possible error caused by strain gradients across the gage length is minimized by integrating the equation in the KI calculation. Theoretical and computed values using finite element analysis of stress intensity factors are compared with experimental results. A good agreement is observed between the present approach and experimental values. It is shown that, in the case of a through-plate crack, the stress intensity factor can be calculated with adequate accuracy using the proposed method.

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Strain gage method for determining stress intensities of sharp-notched strips

Kabeyasawa¹,

Kobayashi²,

Sekine

2001

Experimental Mechanics

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ABSTRACT--An efficient and simple strain gage method for determining the stress intensities of sharp-notched strips is proposed. The bisector of the notch angle is inclined to the edge so that the mixed-mode loading is created simultaneously at the notch tip. A theory of determining the stress intensities using strain gages is described on the basis of the two-dimensional theory of elasticity. Experiments on specimens with various notch shapes are carried out to verify the theoretical results. Experimental results are in good agreement with theoretical results.KEY WORDS--Stress intensity factor, strain gage method, sharp notched strip, fracture mechanics Sharp notches greatly affect the load-bearing capacity of structural components and may serve as crack initiation sites. Therefore, they are of major interest in engineering design. Notches may be regarded as sharp when the radius of curvature of their tips is very small compared with the length of the notch sides. Angular comers of square holes with very small radii of curvature can also be considered as sharp notches, and cracks can be regarded as a particular case of sharp notches.If r is the distance from the notch tip, the stress field at the tips of sharp notches has generally two singularities of order r X and rY, where X and ,/depend on the notch angle between two stress-free boundaries. Therefore, by the singular stress analysis similar to the case of cracks, stress intensities are defined at the tip of the sharp notch on the basis of the linear theory of elasticity. These stress intensities dominate the stress fields near the tip of the sharp notch and may be a key factor in solving the problems related to the strength 12 evaluation ' of the materials with sharp comers and crack initiation. 3,4A number of papers on numerical approaches, such as the boundary collocation method, 5 the finite element method, 6 the boundary clement method 7 and the body force method, 8 are adopted to determine the stress intensities K t )~ and/or KH,,/ at the tip of sharp notches. Only a few works have reported on experimental procedures, such as the caustic method 9,10 and the photoclastic method. 11

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Experimental Determination Technique of Stress Intensity Factor and Its Application

Cited by 4 publications

References 13 publications

A New FEM Approach for the Determination of Fracture Parameters in Polymethyl-metacrylate PMMA

A New FEM Approach for the Determination of Fracture Parameters in Polymethyl-metacrylate PMMA

A Numerical Approach for the Determination of Mode I Stress Intensity Factors in PMMA Materials

Strain gage method for determining stress intensities of sharp-notched strips

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