Article
Hybrid determination of mixedmode stress intensity factors on discontinuous finitewidth plate by finite element and photoelasticity
Journal of Mechanical Science and Technology (Impact Factor: 1.09). 01/2011; 25(10):25352543. DOI: 10.1007/s1220601107401
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Article: Accuracy improvement technique for measuring stress intensity factors in photoelastic experiment
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ABSTRACT: Fracture coefficients, together with the exact origin of the crack, were extracted from data sets produced an overdeterministic system solved by an iterative least squares method. Power series type williams equations were used in the analyses. The accuracy evaluation indicated that the first four terms of williams equations are sufficient to describe the stress field in the vicinity of the crack tip for both mode I and mixed mode cases. Experimental study showed that the first two terms of williams equations, which are the same as the modified westergaard equations, cannot be used to extract mixed mode fracture parameters accurately within the data collection region of 0.07 <r/a <0.30, where r and a are radial coordinate and crack length for an edge crack, respectively.Journal of Mechanical Science and Technology 02/1991; 5(1):2227. · 1.09 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Photoelasticity is one of the most widely used wholefield optical methods for stress analysis. The technique of birefringent coatings, also called the method of photoelastic coatings, extends the classical procedures of model photoelasticity to the measurement of surface strains in opaque models made of any structural material. Photoelastic phaseshifting method can be used for the determination of the phase values of isochromatics and isoclinics. In this paper, photoelastic phaseshifting technique and conventional BabinetSoleil compensation method were utilized to analyze a specimen with a triangular hole and a circular hole under bending. Photoelastic phaseshifting technique is wholefield measurement. On the other hand, conventional compensation method is point measurement. Three groups of results were obtained by phaseshifting method with reflective polariscope arrangement, conventional compensation method and FEM simulation, respectively. The results from the first two methods agree with each other relatively well considering experiment error. The advantage of photoelastic phaseshifting method is that it is possible to measure the stress distribution accurately close to the edge of holes.Journal of Solid Mechanics and Materials Engineering 01/2008; 2:549556.  [Show abstract] [Hide abstract]
ABSTRACT: In this paper, the linear and nonlinear leastsquares methods are developed in matrix notation as solution schemes to determine key parameters from wholefield fringe patterns. Examples of the proposed methods to the determination of the photoelasticfringe constant from a disk in diametral compression and the openingmode geometric stressintensity factor from the photoelasticfringe loops in the neighborhood of a crack tip are presented. In the latter example, the location of the crack tip is treated as an unknown to be determined from the analysis.Experimental Mechanics 05/1980; 20(6):192197. · 1.55 Impact Factor
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