Accession Number : ADA258807


Title :   Some Recent Results on Stresses in Thin Films and Precipitates.


Descriptive Note : Technical rept.,


Corporate Author : NORTHWESTERN UNIV EVANSTON IL DEPT OF MATERIALS SCIENCE AND ENGINEERING


Personal Author(s) : Cohen, J B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258807.pdf


Report Date : Oct 1992


Pagination or Media Count : 20


Abstract : Diffraction remains the premier tool for sampling the residual stresses in materials non destructively, the only one capable of determining the entire stress tensor, and with few assumptions. The technique has kept pace with the needs of researchers in the area of multiphase materials; now, the stresses can be separated into macro and micro components. The deviatoric macro and micro stress components and hydrostatic macrostress can be measured without knowledge of the unstressed lattice parameter. Bond strength of film and fiber and the yield stress can be examined by cooling samples, and there are new developments that enable gradients to be determined.


Descriptors :   *STRESS ANALYSIS , *THIN FILMS , *PRECIPITATES , STRESSES , FIBERS , STRAIN(MECHANICS) , DIFFRACTION , SAMPLING , TENSORS , HYDROSTATICS , RESIDUAL STRESS , COOLING , MATERIALS , PARAMETERS , NONDESTRUCTIVE TESTING


Subject Categories : Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE