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oai:www.ideals.illinois.edu:2142/68641 2023-07-11 col_2142_5131 col_2142_47053 com_2142_5130 com_2142_47052 com_2142_234

Chen, Wen-Ching 2014-12-14T16:00:42Z 2014-12-14T16:00:42Z 10000-01-01 1980 1980 An analytical model for nonarbitrarily defining the crack initiation length (a(,I)) of a notched member on basis of the minimum total life estimate (Life-calculation method) is proposed. The crack initiation length (a(,I)) is not a fixed value, as usually assumed, but varies with stress level (or life), notch size, notch geometry, and material. The partitioning of crack initiation life (N(,I)) and crack propagation life (N(,P)) can be achieved using this model. This model provides an interpretation of fatigue notch size effect and a powerful means for numerically determining Neuber and Peterson parameters "SQRT.((rho)" and "a". On the basis of crack initiation life, K(,f) is determined from the stress-strain parameter ((DELTA)S(,I)(DELTA)e(,I)E)('1/2) at the crack initiation length (a(,I)). The longstanding problem as to how to join the N(,I) estimate using the local stress-strain approach and the N(,P) estimate using fracture mechanics concepts appears to be solved through the use of a(,I) defined by the proposed model. Made available in DSpace on 2014-12-14T16:00:42Z (GMT). No. of bitstreams: 1 8017920.pdf: 3483215 bytes, checksum: 8834dc8bc0b8749daa4609fe3ecdd376 (MD5) Previous issue date: 1980 Embargo set by: Seth Robbins for item 68819 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 126 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1980. http://hdl.handle.net/2142/68641 (UMI)AAI8017920 eng Engineering, Metallurgy A Model for Joining the Fatigue Crack Initiation and Propagation Analyses text Metallurgy and Mining Engineering Metallurgical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.