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1992 | OriginalPaper | Buchkapitel

Separation of Microstresses and Macrostresses

verfasst von : R. A. Winholtz

Erschienen in: Measurement of Residual and Applied Stress Using Neutron Diffraction

Verlag: Springer Netherlands

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In two phase or composite materials it is possible to determine both the macrostresses in the material and the average microstresses present in each phase. The stress equilibrium relations allowing this separation are outlined. It is shown that errors in the unstressed lattice parameter lead to errors in only the hydrostatic component of the stress tensor. It is thus possible to accurately determine the entire deviatoric macrostress and microstress tensors without the unstressed lattice parameters of the individual phases. Two examples of the usefulness of macrostress and microstress measurements are given. In a SiC-TiB2 microcracking ceramic com-posite large hydrostatic microstresses develop during consolidation due to differential thermal contraction. Microcracks form during stressing, relaxing the thermal microstresses. Measurements of this relaxation have helped quantify the toughening in this system associated with microcracking. Measurements in both the ferrite and cementite phases of 1080 steel during low cycle fatigue show the proportion of the applied load carried by each phase. These results show that as the material yields in both tension and compression, the carbides take a higher fraction of the load and thus the stress range experienced by the carbide phase is much higher.

Metadaten
Titel
Separation of Microstresses and Macrostresses
verfasst von
R. A. Winholtz
Copyright-Jahr
1992
Verlag
Springer Netherlands
DOI
https://doi.org/10.1007/978-94-011-2797-4_8

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