Print Email Facebook Twitter Comparison of fracture toughness in titanium alloys IMI 550 and IMI 551 Title Comparison of fracture toughness in titanium alloys IMI 550 and IMI 551 Author Wanhill, R.J.H. Institution National Aerospace Laboratory NLR Date 1978-12-01 Abstract Fracture toughness tests on two high strength titanium alloys, IMI 550 and 551, showed that the higher strength alloy, IMI 551, had a much lower toughness. The alloys were very similar in microstructure and fracture mechanisms. A number of model formulations for predicting fracture toughness were compared with the experimental results. This comparison indicated a number of parameters to be important, namely yield stress, elastic modulus, plane strain fracture strain, strain hardening exponent and microvoid (dimple) diameter. The observed increase in fracture strain, dimple diameter and fracture toughness with decreasing strength can be rationalized by voids occurring earlier during deformation and by voids initiating at many sites inactive in the lower strength material. Subject high strength alloystitanium alloysfracture strengthyield strengthelastic propertiesstrain hardeningfatigue testsmodulus of elasticityvoidsmicro structuresfractography To reference this document use: http://resolver.tudelft.nl/uuid:45a54084-7d81-439b-acd3-4bec74c63b5d Publisher Nationaal Lucht- en Ruimtevaartlaboratorium Access restriction Campus only Source NLR-TR 78143 U Part of collection Aerospace Engineering Reports Document type report Rights (c) 1978 National Aerospace Laboratory NLR Files PDF NLR_TR_78143_U.pdf 10.07 MB Close viewer /islandora/object/uuid:45a54084-7d81-439b-acd3-4bec74c63b5d/datastream/OBJ/view