Author
H. P. Rossmanith
Bio: H. P. Rossmanith is an academic researcher from University of Vienna. The author has contributed to research in topics: Caustic (optics) & Collocation method. The author has an hindex of 2, co-authored 2 publications receiving 16 citations.
Papers
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TL;DR: In this paper, the theoretical development of the method of caustics and its applicability to anisotropic materials is discussed, and the method displays its full power when employed in conjunction with interactive numerical data reduction and evaluation procedures.
Abstract: This contribution focuses on the theoretical development of the method of caustics and its applicability to anisotropic materials. The method displays its full power when employed in conjunction with interactive numerical data reduction and evaluation procedures. For the analysis the selection of data points along the experimentally recorded caustic curve is done automatically, the selected points are marked on the screen and if necessary interactive correction of the positions is possible. Final proof of the correctness of the result of the automatic data point selection is achieved by comparing for acceptable coincidence the numerically generated caustic determined on the basis of the results of the data-reduction technique with the experimentally recorded caustic.
10 citations
TL;DR: In this article, a hybrid technique for determination of stressintensity factors from static and dynamic-photoelastic-fringe data is proposed which combines both the generalized Westergaard stress function approach and a boundary collocation method.
Abstract: A hybrid technique for determination of stressintensity factors from static-and dynamic-photoelastic-fringe data is proposed which combines both the generalized Westergaard stress function approach and a boundary collocation method. The new technique is especially useful for problems where a short crack initiates from a shallow notch or a crack approaches a free boundary. Modifications toward a mixed dynamic-near-field static-far-field solution procedure are discussed.
6 citations
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DOI•
01 Jan 1997
TL;DR: A submitted manuscript is the version of the article upon submission and before peer-review as discussed by the authors, while a published version is the final layout of the paper including the volume, issue and page numbers.
Abstract: • A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers.
117 citations
TL;DR: In this article, the application of the reflection method of caustics to the fracture mechanics problem of non-transparent mechanically anisotropic materials containing a crack, such as fiber-reinforced composites, is discussed.
29 citations
TL;DR: In this article, a general approach based on photoelasticity to calculate the stress intensity factors KI and KII in any combination of geometry and load is developed, taking the information from both the near and the far field, using four complex functions which are developed in series expansions.
18 citations
TL;DR: In this paper, the caustics method was applied to specimens which have an oblique crack, various thicknesses and an open notch to investigate the stress field around the crack tip.
16 citations
TL;DR: In this paper, a reflection method of caustics is presented for application to cracks in mechanically anisotropic materials such as fiber-reinforced composites, and the results show that the size of the dark spot depends on the load intensity, whereas its shape depends strongly on the mechanical properties of the material, the orientation of the crack tip and the mixed-mode mixture.
Abstract: The originally developed reflection method of caustics is presented for application to cracks in mechanically anisotropic materials such as fiber-reinforced composites. The derived solutions for the combination of crack-opening modes I and II show that the size of the dark spot depends on the load intensity, whereas its shape depends strongly on the mechanical properties of the material, the orientation of the crack tip and the mixed-mode mixture. The evaluation of optical effects is possible using the diameter-measuring method or the advanced multipoint overdeterministic data reduction method. To find the exact position of caustics, the experimental images are 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. The standard experimental testing procedure is performed for cracks oriented 0 deg, 45 deg and 90 deg to the material axes in carbon-fiber-reinforced polymer composites.
15 citations