CRITICAL STRESSES FOR SLIP, TWINNING, AND CLEAVAGE IN SINGLE CRYSTALS OF IRON
An X-Ray, optical and metallographic study of the stresses for--and mechanisms of--slip, twinning and fracture in single crystals of iron prepared from decarburized mild steel has been made. The selection of the glide ellipse has been found to be a function of the relative difficulty of atom motions at various positions along a (111); this function being affected by temperature and distribution of stress. A critical shear stress criterion applies. Twinning has been found to occur on (112) type planes and in (111) directions below -170 deg C. as predicted by a critical shear stress law, mutatis mutandis. The twinning stress is greatly affected by slip. Brittle fracture could be accounted for by a critical normal stress theory within wide limits of error. Ductile fractures predominated for specimens where a cleavage plane, (001), was more than 65 degrees axis. Various effects of prestraining were observed.
Carnegie Mellon UniversityWean Hall 4323
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Pittsburgh, PA United States 15213-3890
Ship Structure CommitteeNational Academy of Science, 2101 Constitution Avenue, NW
Washington, DC United States 20418
- Cox Jr, J J
- Publication Date: 1954-2-1
- Features: References;
- Pagination: 141 p.
- TRT Terms: Cleavage fracture; Cracking; Fracture mechanics; Metallography; Stresses
- Identifier Terms: Ship Structure Committee
- Uncontrolled Terms: Stress concentration
- Subject Areas: Marine Transportation; Materials;
- Accession Number: 00331009
- Record Type: Publication
- Source Agency: Ship Structure Committee
- Report/Paper Numbers: SSC- 66 Final Rpt.
- Contract Numbers: NObs-50230
- Files: TRIS
- Created Date: May 21 1981 12:00AM