Experimental caustics analysis in fracture mechanics of anisotropic materials

Semenski, Damir; Jecić, Stjepan

doi:10.1007/bf02323550

Cited by 14 publications

(10 citation statements)

References 7 publications

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“…The in-plane displacements and strains determined from the process were then used to computer the dynamic SIF. Semenski and Jecic (1999) used the reflection method of caustics for application to cracks in mechanically anisotropic materials. To find the exact position of caustics, the experimental images were analyzed by the simple boundary value method and a more sophisticated differential method, which is accomplished by shifting the real image onto the gradient image.…”

Section: Introductionmentioning

confidence: 99%

Measurement of stress intensity factors by digital camera

Liu

2006

International Journal of Solids and Structures

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This paper developed a least-squares method to evaluate the mixed-mode stress intensity factors (SIFs) of the isotropic material using the computer images from the digital-camera experiment. This experiment measures the crack opening displacement (COD) and then evaluates SIFs by using the least-squares method. The attractions of this method include:(1) specimen preparation and experiment procedures are not complicated and (2) the isolation of the micro-vibration is not necessary in the experiment. Both finite element simulations and laboratory experiments were applied to validate the current least-squares method with acceptable accuracy, if the even terms of the IrwinÕs equation are removed.

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Section: Introductionmentioning

confidence: 99%

Measurement of stress intensity factors by digital camera

Liu

2006

International Journal of Solids and Structures

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“…The surface of Araldit is optically flat and needs no preparation, but the surface of carbon fibre-reinforced composite is textured and should be treated. Here, chemical vapour deposition of an aluminium layer is performed; [5]. The applied aluminium layer has the thickness of approximately 20 microns; therefore, it has no influence on the material strength.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Contact caustics measurements expanded to anisotropic materials

Bakić

Semenski

Jecić

2011

Archives of Civil and Mechanical Engineering

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Regions with high stress gradients represent critical zones of engineering structures, such as crack tip or vicinity of the contact zone. The optical method of caustics is one of the few experimental methods which provide applicable results in these locations. This method was originally developed for crack-tip measurements of stress intensity factors and J-integral for isotropic and then for anisotropic materials. Subsequently, it was extended to the contact problems, where the size and the shape of caustics are related to the amount and the inclination of loading force. Here, the application of the method of caustics is extended to the analysis of contact problems for mechanically anisotropic materials. This makes the caustics method widely applicable to the analysis of any high stress gradient locations in a structure.

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“…They are used to record the actual situation in order to get reliable information about the on-site structure and structural elements. The optical method of caustics is established for the application to mechanically isotropic materials [7] through the process of SIF's evaluation and is advantageously improved for the application to fiber-reinforced composites [8].…”

Section: Experimental Determination Of Stress Intensity Factormentioning

confidence: 99%

Analysis of damaging process and crack propagation

Semenski

Wolf

Božić

2010

EPJ Web of Conferences

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Abstract. Supervising and health monitoring of structures can assess the actual state of existing structures after initial loading or in the state of operation. Structural life management requires the integration of design and analysis, materials behavior and structural testing, as given for several examples. Procedure of survey of structural elements and criteria for their selection must be strongly defined as it is for the offshore gas platforms. Numerical analysis of dynamic loading is shown for the Aeolian vibrations of overhead transmission line conductors. Since the damper's efficiency strongly depends on its position, the procedure of determining the optimum position of the damper is described. The optical method of caustics is established in isotropic materials for determination of the stress intensity factors (SIFs) of the cracks in deformed structures and is advantageously improved for the application to fiberreinforced composites. A procedure for simulation of crack propagation for multiple cracks was introduced and SIFs have been calculated by using finite element method. Crack growth of a single crack or a periodical array of cracks initiated at the stiffeners in a stiffened panel has been investigated.

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Experimental caustics analysis in fracture mechanics of anisotropic materials

Cited by 14 publications

References 7 publications

Measurement of stress intensity factors by digital camera

Measurement of stress intensity factors by digital camera

Contact caustics measurements expanded to anisotropic materials

Analysis of damaging process and crack propagation

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