K
Kurt E. Johanns
Researcher at Technische Universität Darmstadt
Publications - 26
Citations - 941
Kurt E. Johanns is an academic researcher from Technische Universität Darmstadt. The author has contributed to research in topics: Indentation & Nanoindentation. The author has an hindex of 16, co-authored 25 publications receiving 774 citations. Previous affiliations of Kurt E. Johanns include Oak Ridge National Laboratory & University of Tennessee.
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Measurement of fracture toughness by nanoindentation methods: Recent advances and future challenges
TL;DR: In this paper, the authors describe recent advances and developments for the measurement of fracture toughness at small scales by the use of nanoindentation-based methods including techniques based on micro-cantilever, beam bending and micro-pillar splitting.
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A novel pillar indentation splitting test for measuring fracture toughness of thin ceramic coatings
TL;DR: In this article, the authors explore a promising new technique that potentially overcomes these issues based on nanoindentation testing of micro-pillars produced by focused ion beam milling of the films.
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Cohesive interface simulations of indentation cracking as a fracture toughness measurement method for brittle materials
TL;DR: In this paper, a finite element model of four-sided pyramidal indentation adopting cohesive interface elements is developed to study the effects of indenter geometry, load, cohesive interface parameters, and material properties on the initiation and propagation of the median/radial/half-penny crack systems.
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Effects of indenter angle on micro-scale fracture toughness measurement by pillar splitting
TL;DR: In this paper, a pillar splitting technique was used to characterize the fracture toughness of materials at the micrometer scale, which can be used to measure fracture toughness over a broad range of material properties.
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A simple stochastic model for yielding in specimens with limited number of dislocations
P. Sudharshan Phani,Kurt E. Johanns,Easo P. George,Easo P. George,George M. Pharr,George M. Pharr +5 more
TL;DR: In this paper, a simple statistical model is developed based on a random distribution and orientation of dislocations in order to explain recent experimental observations of the strength of small specimens containing a limited number of disllocations.