caa a22 4500 46912492X CHVBK 20180323133148.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF00048955 doi (NATIONALLICENCE)springer-10.1007/BF00048955 The specific enthalpy of fracture for beta Ti-15-3 alloy [Elektronische Daten] [I. Mostafa, G. Welsch, A. Moet] Fatigue crack propagation (FCP) experiments were conducted on beta Ti-15-3 alloy under various loading conditions to examine the constancy of the specific enthalpy for fracture, advanced by the Crack Layer (CL) theory as a material parameter characteristic of its intrinsic toughness. The energy release rate and the irreversible work were determined from load-displacement curves during crack propagation. Microscopic and diffraction analyses were conducted to identify the damage mechanisms ahead of the crack tip. A damage zone whose geometry exhibited plane strain character at the initial stage of crack propagation was observed optically. The damage zone transformed into plane stress configuration when the crack reached half its critical length. Damage mechanisms involved slip lines and microcracking which is believed to ensue from intense accumulation of slip processes. The magnitude of microcracking became more weighty as the crack moved deeper into plane stress dominance. The damage preceding crack advance was quantitatively assessed as the ‘crack resistance moment' which is the volume of transformed material per unit crack extension. Application of the CL theory to the data generated under a wide range of applied stress levels gave rise to a constant value of the specific enthalpy of fracture, 20 MJ/m3. This value is in close agreement with the specific energy of slip lines computed from microstructural considerations. Kluwer Academic Publishers, 1992 Mostafa I. Department of Materials Science and Engineering, Case Western Reserve University, 44106, Cleveland, Ohio, USA aut Welsch G. Department of Materials Science and Engineering, Case Western Reserve University, 44106, Cleveland, Ohio, USA aut Moet A. Department of Macromolecular Science, Case Western Reserve University, 44106, Cleveland, Ohio, USA aut International Journal of Fracture Kluwer Academic Publishers 58/4(1992-12-01), 361-373 0376-9429 58:4<361 1992 58 10704 https://doi.org/10.1007/BF00048955 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00048955 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mostafa I. Department of Materials Science and Engineering, Case Western Reserve University, 44106, Cleveland, Ohio, USA aut NATIONALLICENCE 700 1- Welsch G. Department of Materials Science and Engineering, Case Western Reserve University, 44106, Cleveland, Ohio, USA aut NATIONALLICENCE 700 1- Moet A. Department of Macromolecular Science, Case Western Reserve University, 44106, Cleveland, Ohio, USA aut NATIONALLICENCE 773 0- International Journal of Fracture Kluwer Academic Publishers 58/4(1992-12-01), 361-373 0376-9429 58:4<361 1992 58 10704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer