Fatigue crack growth and retardation due to overloads in metal-matrix composites Volume I. Fatigue crack growth in boron-aluminum metal-matrix composites. Final report, June 1982-December 1985
Technical Report
·
OSTI ID:6953787
The fatigue crack growth in a Boron-Aluminum metal matrix composite is investigated. The material consists of II plies of diffusion bonded 5.6 mil boron fibers in a 6061 aluminum matrix. In this study, the composite is characterized as an orthotropic elastic-plastic material using uniaxial test specimens. The constraint effect of the plasticity encountered in specimens with stress gradients is characterized using a tapered specimen. The modeling is verified on a specimen with a centered circular hole and specimens with transverse and oblique fatigue cracks. A series of baseline fatigue tests are performed an transverse and oblique fatigue cracks. The baseline tests are run at room temperature using a 10 Hz sinusoidal loading with a minimum applied load near zero. An effective stress intensity factor is developed to correlate all the baseline fatigue data. Overload tests are carried out on transverse and oblique cracked specimens. The specimens are cycled as was done in the baseline tests, and a single tensile overload was performed. Cyclic loading to near failure followed. The post-overload crack growth behavior first accelerates, then decelerates. This crack growth eventually assumes its pre-overload state.
- Research Organization:
- Purdue Univ., Lafayette, IN (United States). School of Aeronautics and Astronautics
- OSTI ID:
- 6953787
- Report Number(s):
- AD-A-259188/1/XAB; CNN: F33615-82-K-3218
- Country of Publication:
- United States
- Language:
- English
Similar Records
Observations of fatigue crack initiation and damage growth in notched titanium matrix composites
Fatigue crack growth and retardation due to overloads in metal-matrix composites. Volume 2. Finite element analysis of cracks in metal matrix composites. Final report
Evolution of Residual-Strain Distribution through an Overload-Induced Retardation Period during Fatigue Crack Growth
Conference
·
Sun Dec 31 23:00:00 EST 1989
·
OSTI ID:6975935
Fatigue crack growth and retardation due to overloads in metal-matrix composites. Volume 2. Finite element analysis of cracks in metal matrix composites. Final report
Technical Report
·
Fri Aug 01 00:00:00 EDT 1986
·
OSTI ID:6649652
Evolution of Residual-Strain Distribution through an Overload-Induced Retardation Period during Fatigue Crack Growth
Journal Article
·
Thu Dec 31 23:00:00 EST 2009
· Journal of Applied Physics
·
OSTI ID:993444