X-ray analysis of steep residual stress gradients: The 2θ-derivative method
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Thomas Erbacher
Abstract
Machined ceramics and other hard materials exhibit very steep subsurface gradients of residual stresses. X-ray analysis enables the non-destructive assessment of the distributions of these residual stresses versus the distance from the surface via variation of the penetration depth of the X-rays. Conventional evaluation procedures are based on continuous or piecewise defined polynomial functions of stress versus distance, which are fitted to the X-ray data by means of complex solution schemes. These solution schemes are, however, in many cases unstable and difficult to handle. We have developed an entirely novel evaluation procedure which is based on polynomials fitted to the “2θ vs. sin2 ψ” plots obtained from the X-ray measurements. It is shown that the residual stress profiles can be computed explicitly from these polynomials without any further assumptions. The evaluation procedure is described in detail and demonstrated in a case study on ground alumina ceramics.
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© 2008, Carl Hanser Verlag, München
Articles in the same Issue
- Contents
- Contents
- Editorial
- To Professor Dr.-Ing. Karl-Heinz Zum Gahr on the occation of his 65th birthday
- Review
- Innovative materials for energy technology
- STAU – a review of the Karlsruhe weakest link finite element postprocessor with extensive capabilities
- Basic
- “Evolution” of microstructure in materials
- X-ray analysis of steep residual stress gradients: The 2θ-derivative method
- Investigation of surface fatigue of thermally sprayed micro- and nanocrystalline cylinder wall coatings by means of cavitation testing
- Thermal, mechanical and fretting fatigue of silicon nitride
- Effect of phase stability and composition on hydrogen diffusion in the binary systems Ti–Mo and Ti–V and related Ti-base alloys
- Determination of v–K curves from lifetime tests with reloaded survivals
- Mechanical properties of a single gecko seta
- Applied
- Influence of Fe–F-co-doping on the dielectric properties of Ba0.6Sr0.4TiO3 thick-films
- Microstructural and acoustic damage analysis and finite element stress simulation of air plasma-sprayed thermal barrier coatings under thermal cycling
- The running-in of amorphous hydrocarbon tribocoatings: a comparison between experiment and molecular dynamics simulations
- Development of multifunctional thin films using high-throughput experimentation methods
- A transmission electron microscopy procedure for in-situ straining of miniature pseudoelastic NiTi specimens
- Recent developments in micro ceramic injection molding
- σ-phase morphologies and their effect on mechanical properties of duplex stainless steels
- Development of high power density cathode materials for Li-ion batteries
- Notification
- DGM News
Articles in the same Issue
- Contents
- Contents
- Editorial
- To Professor Dr.-Ing. Karl-Heinz Zum Gahr on the occation of his 65th birthday
- Review
- Innovative materials for energy technology
- STAU – a review of the Karlsruhe weakest link finite element postprocessor with extensive capabilities
- Basic
- “Evolution” of microstructure in materials
- X-ray analysis of steep residual stress gradients: The 2θ-derivative method
- Investigation of surface fatigue of thermally sprayed micro- and nanocrystalline cylinder wall coatings by means of cavitation testing
- Thermal, mechanical and fretting fatigue of silicon nitride
- Effect of phase stability and composition on hydrogen diffusion in the binary systems Ti–Mo and Ti–V and related Ti-base alloys
- Determination of v–K curves from lifetime tests with reloaded survivals
- Mechanical properties of a single gecko seta
- Applied
- Influence of Fe–F-co-doping on the dielectric properties of Ba0.6Sr0.4TiO3 thick-films
- Microstructural and acoustic damage analysis and finite element stress simulation of air plasma-sprayed thermal barrier coatings under thermal cycling
- The running-in of amorphous hydrocarbon tribocoatings: a comparison between experiment and molecular dynamics simulations
- Development of multifunctional thin films using high-throughput experimentation methods
- A transmission electron microscopy procedure for in-situ straining of miniature pseudoelastic NiTi specimens
- Recent developments in micro ceramic injection molding
- σ-phase morphologies and their effect on mechanical properties of duplex stainless steels
- Development of high power density cathode materials for Li-ion batteries
- Notification
- DGM News