The Unloading Compliance Method for Crack Length Measurement Using Compact Tension and Precracked Charpy Specimens

Neale, B.K.; Priest, R. H.

doi:10.1520/stp34536s

Cited by 12 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Relaxation in the composites should be more complex than that in the monolithic material. Sufficient relaxation time was allowed, otherwise compliance may be underestimated or overestimated (Gudas and Davis 1982;Neal and Priest 1985). For this purpose, the crosshead was stopped for 60 s before loading/unloading, and load relaxation was observed.…”

Section: Resultsmentioning

confidence: 99%

Effect of heat treatment on fracture behavior of steel-wire-reinforced gray cast iron

Şi̇mşi̇r

2008

Int J Fract

View full text Add to dashboard Cite

In this experimental study, fracture toughness of heat-treated metal matrix composite was investigated. The gray cast iron was reinforced with steel wire of volume fraction of V r = 0.05 and three-point bend specimens were manufactured to determine fracture toughness. Heat treatment was applied to the specimens at the normalization temperatures of 850 • C and then cooled in three distinct environments (water, air, and furnace). Fracture toughness of the metal matrix composite was calculated by unloading compliance method. The study shows that the fracture toughness of the steel-wire-reinforced gray cast iron increases with the increase in cooling rate. Scanning electron microcopy (SEM) analyses were used to examine the microstructure and fracture surface. It is observed that the carbon diffuses from the gray cast iron to the steel wire and transition region having partially dissolved graphite was observed due to carbon diffusion, and it plays an important role in the fracture toughness depending on the cooling media.

show abstract

Section: Resultsmentioning

confidence: 99%

Effect of heat treatment on fracture behavior of steel-wire-reinforced gray cast iron

Şi̇mşi̇r

2008

Int J Fract

View full text Add to dashboard Cite

show abstract

“…The J-Aa resistance curves of EN3A steel in the as-received and hardened conditions are shown in Figs 2 and 3 respectively. The functions used to correct for extraneous displacements and evaluate both J and Aa were taken from Neale and Priest [7]. The J values were determined from measured initial crack length and not adjusted for crack growth.…”

Section: Resistance Curvesmentioning

confidence: 99%

“…is the crack growth due to stable tearing. dJ,/da is the slope of the resistance curve without concurrent fatigue and (dJ/dn), is the measured increment of Jper cycle evaluated from the change in the area under the load displacement record between fatigue cycles using the functions given by Neale and Priest [7]. Equation (1) was applied to the EN3A steel data and the results compared with the measured crack growth rates…”

Section: Fractographymentioning

confidence: 99%

On Fatigue Crack Growth and Stable Tearing

Neale

1988

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

An experimental and analytical investigation has been performed to examine the effect of concurrent fatigue cycling and stable tearing on the crack growth fracture resistance of EN3A steel at 360°C. The steel was tested in the as-received and hardened conditions, hardening being achieved by pre-cracking at a load comparable to the elastic limit of the test specimens. For each condition of the steel, resistance curves are obtained both with and without concurrent fatigue cycling.A significant increase in the crack growth rates occurred as a result of concurrent fatigue cycling. The rates are in reasonably close agreement with the values predicted from the sum of the fatigue crack growth and stable tearing components. The J-estimation formula of Ainsworth is used to demonstrate that there is no interaction between stable tearing and fatigue in the tests for the steel in the as-received condition. NOMENCLATURE a, a, = crack length, effective crack length C, 9 = constants in the Paris equation B, Be, B, = specimen thickness, effective thickness, net section thickness of a side grooved specimen da -= crack growth rate dn dJRda = slope of the J-Aa curve _ --increment of J per cycle dJ dn E = Young's modulus F ( a / W ) = stress intensity function J = fracture resistance K = stress intensity factor m (a/ W) = limit load function P = load Po = limit load W = specimen width cxf = reference strain p = constant v = Poisson's ratio uo = yield stress Q,~ = reference stress

show abstract

“…The test loading was regularly interrupted by 10% unloadings (Smith and Doig, 1986;Neal and Priest, 1986) …”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on the fracture toughness of A516 Gr70 steel

Seok

2000

KSME International Journal

View full text Add to dashboard Cite

Fracture toughness HC and KIC tests were performed on ASI6 Or70 carbon steel plate at the temperature ranging from -160'C to 600'C, and test results were analyzed according to ASTM E 813 and ASTM E 399. Unloading compliance J-integral tests were performed on ITCT specimens. The relation between the J Ie value and the test temperature was obtained. It was concluded that the temperature ranging from -IS'C to 600'C is the upper shelf region of ductile-brittle transition temperature, and in this temperature range, fracture toughness J re values decreased with increasing temperature. The ductile brittle transition temperature of the material may be around -30·C. In the region near -30'C, the tendency of J Ie to decrease with decreasing temperature was significant.

show abstract

The Unloading Compliance Method for Crack Length Measurement Using Compact Tension and Precracked Charpy Specimens

Cited by 12 publications

References 7 publications

Effect of heat treatment on fracture behavior of steel-wire-reinforced gray cast iron

Effect of heat treatment on fracture behavior of steel-wire-reinforced gray cast iron

On Fatigue Crack Growth and Stable Tearing

Effect of temperature on the fracture toughness of A516 Gr70 steel

Contact Info

Product

Resources

About