Accession Number : AD0428452


Title :   THE ANALYSIS OF FRACTURE SURFACES BY ELECTRON MICROSCOPY


Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WA


Personal Author(s) : Pelloux, Regis M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/428452.pdf


Report Date : Dec 1963


Pagination or Media Count : 80


Abstract : This paper reviews and illustrates the characteristic features of the following modes of fracture: (1) Transgranular fracture which can take place either - by cleavage along crystallographic planes - or by the formation and coalescence of microvoids which leave concave depressions called ''dimples'' on both fracture surfaces, - or by the slow progression of a fatigue crack by a mixed ductile - cleavage mode of fracture. (2) Intergranular fracture which is either - brittle when there is a perfect separation of the grains along the grain boundaries, - or ductile when this separation is associated with the plastic formation of void along the grain boundaries.


Descriptors :   *FRACTURE(MECHANICS) , *ELECTRON MICROSCOPY , *FRACTOGRAPHY , STRESSES , SIMULATION , METALS , SURFACES , PLASTIC PROPERTIES , DUCTILITY , GRAIN BOUNDARIES , GRAIN STRUCTURES(METALLURGY) , FATIGUE(MECHANICS) , BRITTLENESS , MICROSTRUCTURE , CORROSION , DEFORMATION , FILMS , ALLOYS


Subject Categories : Fabrication Metallurgy
      Test Facilities, Equipment and Methods
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE