Notch fracture in {gamma}-titanium aluminides
- UES, Inc., Dayton, OH (United States). Materials and Processes Div.
- Wright Lab., Wright-Patterson AFB, OH (United States)
The notch fracture behavior of two {gamma}-titanium aluminide alloys, having duplex and fully lamellar microstructures, has been investigated as a function of notch geometry and test temperature. The unnotched tensile properties and notch fracture loads are used to perform finite element analysis (FEA) to determine triaxial tensile stresses and effective plastic strains in the vicinity of notch roots. These results, together with fractographic examinations of notch failures, indicate that a crack nucleates in the triaxial tensile field when the effective von Mises stress just exceeds the uniaxial tensile yield stress. The high tensile stress component then propagates the nucleated microcrack to failure with local stress intensity reaching the toughness of the material. Thus, both plasticity and high tensile stress are required to cause notch failure.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 438555
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 12 Vol. 27; ISSN MMTAEB; ISSN 1073-5623
- Country of Publication:
- United States
- Language:
- English
Similar Records
Unconstrained and constrained tensile flow and fracture behavior of an Nb-1.24 at. pct Si alloys
Fracture toughness of gamma-base titanium aluminides