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Keywords: crack closure
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Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. May 2012, 9(5): 1–13.
Published Online: July 17, 2012
... in trend when the frequencies are dropped further, which could be due to domination of corrosion mechanism. To understand the role of crack closure, crack closure estimates were obtained at periodic intervals of crack length and the effective stress intensity graphs suggest acceleration in crack growth...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. February 2012, 9(2): 1–12.
Published Online: May 8, 2012
...-opening loads than the BFS gage in the threshold and near-threshold regimes. Previous research had proposed that high stress ratios (R ≥ 0.7) and K max test conditions produce closure-free conditions based on crack-mouth-opening-displacement or BFS gages, and plasticity-induced crack-closure modeling...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. April 2012, 9(4): 1–15.
Published Online: April 30, 2012
... loading, the CPCA and CPLR tests generated lower thresholds and faster rates than using the standard ASTM load-reduction method. All load-reduction tests exhibited an accumulation of debris at the crack front near threshold conditions. A crack-closure analysis was preformed to calculate the effective...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. January 2012, 9(1): 1–17.
Published Online: December 23, 2011
...Michael K. Schaper This paper summarizes long-term research on fatigue crack closure in several labs of the author. Various experimental techniques were used in different combinations. Primarily, a sophisticated dynamic compliance technique based on highly sensitive resonance vibration measurements...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. January 2012, 9(1): 1–32.
Published Online: December 23, 2011
... their influence to the moderation of crack-tip surface chemistry and surface physics. This demands the treatment of threshold stress intensity as a variable, sensitive to load history. The correct estimation of crack closure is also crucial to determining the variable amplitude fatigue response and demands...
Journal Articles
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. September 2008, 5(8): 1–13.
Published Online: September 1, 2008
... mesh had an element size of 2 μm. A refined mesh had an element size four times smaller (0.5 μm) than the course mesh. Fatigue-crack growth and crack-closure effects were simulated over a wide range in stress ratios ( R =0 to 0.8) and load levels, after compression precracking. The crack-tip-opening...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. April 2006, 3(4): 1–11.
Published Online: April 1, 2006
... , Vol. 26 , 2003 , pp. 675 - 682 . Kondo , Y. , Materials Science Forum , Vol. 482 , 2005 , pp. 89 - 94 . 2005-05-18 - 2005-05-20 Fatigue and Fracture Mechanics: 35th Volume welded joint cyclic large strain fatigue strength fatigue limit pre-crack crack closure...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. March 2006, 3(3): 1–12.
Published Online: March 1, 2006
... . Elber , W. , “ The Significance of Fatigue Crack Closure ,” Damage Tolerance in Aircraft Structures , ASTM STP 486 , ASTM International , West Conshohocken, PA , 1971 , pp. 230 - 242 . Liaw , P. K. , Peck , M. G. , and Rudd , G. E. , “ Fatigue Crack Growth Behavior of D6AC Pace...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. July 2005, 2(7): 1–13.
Published Online: July 1, 2005
... by closure or residual stress. Threshold data ARE often generated from long crack specimens by load shedding as outlined in ASTM E 647. However, this data can be non-conservative and variable due to load history effects caused by crack closure. Generating closure-free short crack FCGR data requires much more...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. June 2005, 2(6): 1–18.
Published Online: June 1, 2005
...R Sunder Experiments were performed on Al-alloy test coupons under specially programmed variable amplitude load sequences to assess crack closure as well as actual microscopic crack extension. Quantitative fractography of the fractures suggests that closure can account for only a fraction...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. June 2005, 2(6): 1–10.
Published Online: June 1, 2005
..., with regions in the interior opening prior to regions near the free surface. 17 11 2003 27 08 2004 01 06 2005 fatigue crack propagation threshold crack closure 2003-11-19 - 2003-11-21 Fatigue and Fracture Mechanics: 34th Volume References Doker , H. , Bachmann , V...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. June 2005, 2(6): 1–12.
Published Online: June 1, 2005
... closure prevails and the existing ASTM method does not calculate the correct opening load. With this in mind, a new technique was developed (‘Q’ method). It uses integration instead of differentiation of the compliance data. It also accounts for the partial crack closure situations. The derivation...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. May 2005, 2(5): 1–19.
Published Online: May 1, 2005
... estimates of crack closure loads for a very wide range of practical conditions from just a few analyses of the type described here. Journal of ASTM International, May 2005, Vol. 2, No. 5 Paper ID JAI11986 Available online at www.astm.org Robert H. Dodds, Jr.1 and Sushovan Roychowdhury2 Modeling of Three...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. April 2005, 2(4): 1–15.
Published Online: April 1, 2005
... branching and the crack closure phenomena are generally described in the frame of linear elastic fracture mechanics under the assumption of the remote Mode I loading. Using this approach, intrinsic values of fracture toughness and fatigue crack growth threshold can be determined, and the roughness-induced...
Journal Articles
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. January 2005, 2(1): 1–16.
Published Online: January 1, 2005
...R Sunder Experiments were performed on 10 mm thick C(T) specimens cut from Al-alloys to assess fatigue crack growth behavior under periodic overloads by comparison to constant amplitude loading. The tests were performed at a sufficiently high stress ratio to avoid crack closure, whose absence...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. November 2004, 1(10): 1–10.
Published Online: November 1, 2004
... is not affected by the overload, i.e., if the constant amplitudes are smaller than the effective threshold they do not contribute to crack propagation. If both, the constant amplitudes and the overload amplitudes contribute to crack propagation, the build up of crack closure is affected by the load history...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. November 2004, 1(10): 1–21.
Published Online: November 1, 2004
...R Sunder; NE Ashbaugh; WJ Porter; AH Rosenberger Fractographic studies on Al alloys and a nickel-base super-alloy point to the combined action of three major load-interaction mechanisms in controlling crack growth under variable-amplitude loading. These are crack closure, residual stress, and crack...
Journal Articles
Publisher: ASTM International
Article Type: Research-Article
J. ASTM Int.. September 2004, 1(8): 1–17.
Published Online: September 1, 2004
.... Most model parameters are derived from constant amplitude S-N curves and the Haigh diagram, but two sets of long life variable amplitude tests are needed to derive the variable amplitude interaction parameters. nodular cast iron variable amplitude fatigue high cycle fatigue crack closure...