On a relationship between stretched zone parameters and fracture toughness of ductile structural steels

Krasowsky, A. J.; Vainshtok, V. A.

doi:10.1007/bf00681558

Cited by 34 publications

(15 citation statements)

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“…The static tests results agree well with the data from [16] for the same 15H2NMFA steel of another melt: subcritical crack growth in 12 to 20 mm thick specimens was observed at the temperature above 225 K.…”

Section: Fracture Mechanismsupporting

confidence: 81%

“…In the case of dynamic loading, at a test temperature below 183 K the stretched zone could not be found, while in the case of static loading the stretched zone could be observed even at 78 K. Similarly to Fig. 5, the temperature shift of static and dynamic curves relative to each other constitutes over 100 K. Small scatter of the experimental points should also be noted as compared to the stereofractographic examination results of the stretched zone only on one side of the fracture surface [16]. At the same time, for the steel 15H2NMFA of two different melts investigated, good agreement is observed of the average 2h values obtained in [16] and the 2h values in Fig.…”

Section: Resultsmentioning

confidence: 87%

“…It should be noted that the two halves of the fracture surface were not identical which resulted in a different height of the stretched zone on each of them. Considering this fact, the designation 2h is conventional and presented in a traditional way [16].…”

Section: B(w-a)'mentioning

confidence: 99%

“…l -')/2o(I<1 +'*)/21 (16) As a result of Pc, o,, independence of and n weak dependence on the temperature and loading rate, the yield strength o v is the main characteristic depending on those two parameters. Its temperature and strain rate dependence can be described [22,23] Considering the fact that at low temperature the first term in square brackets exceeds markedly the % value, after the transformation it is possible to write as a first approximation: n B 1 -n kTps e0 n~ 1 lg flK~ l~n°C = A~-71gT -lg %°" (19) This relationship constitutes a linear dependence between Tps and lg B, as well as between 1/Tps and lg ~.…”

Section: Brittle-to-ductile Transition Temperaturementioning

confidence: 99%

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Brittle-to-ductile transition in steels and the critical transition temperature

Krasowsky¹,

Kashtalyan²,

Krasiko³

1983

Int J Fract

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Specimens of different thickness made of a low-alloy steel were tested to determine fracture toughness under static and impact loading at room and low temperatures. It was found that for the specimen of each thickness there was a specific brittle-to-ductile transition temperature Tps defined as the upper temperature boundary up to which plane-strain conditions were valid at fracture. The temperature Tee, as well as the brittleness transition temperature Ts0 (determined via the 50% ductile component of the fracture surface), rose with the increase in the thickness B of a specimen. The value of Tps was found to be in a linear dependence on lgB for both static and impact loading.

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Section: Fracture Mechanismsupporting

confidence: 81%

Section: Resultsmentioning

confidence: 87%

Section: B(w-a)'mentioning

confidence: 99%

Section: Brittle-to-ductile Transition Temperaturementioning

confidence: 99%

See 2 more Smart Citations

Brittle-to-ductile transition in steels and the critical transition temperature

Krasowsky¹,

Kashtalyan²,

Krasiko³

1983

Int J Fract

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“…Krasowsky [25,26] and his colleagues showed clearly that the stretch height is not symmetrically divided on the two fracture surfaces. Because the crack usually grows from the blunted zone at an angle to the nominal fracture plane, the deformation left on one of the surfaces may be quite different on the other.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Failure Physics for Structural Failure Prognosis and Diagnosis

Shockey¹,

Simons²,

Kobayashi³

et al. 2003

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information , 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YY)2. REPORT TYPE 3. DATES COVERED (From -To) SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING AGENCY ACRONYM(S)AFRL SPONSORING/MONITORING AGENCY REPORT NUMBER(S) AFRL-ML-WP-TR-2004-4232 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; release is unlimited. SUPPLEMENTARY NOTESReport contains color. ABSTRACTThe physics of microstructural deformation and failure in IN100 was investigated to improve existing tools for predicting and analyzing turbine disc failure. A finite element failure model of damage evolution under cyclic loads was developed and applied to simulate fatigue cracking in a compact tension specimen. A procedure was developed for determining from a fracture surface whether a failed component had experienced overloads and for estimating the overload magnitude and crack delay. A method for extracting and categorizing fracture surface features was developed to assist microstructure-based prognosis models and enable a data base approach for failure analysis. SUBJECT TERMS I. EXECUTIVE SUMMARYFracture physics based tools for predicting and diagnosing structural failure are needed to improve the readiness of DoD assets. The research effort reported here is aimed at improving understanding of the evolution of deformation and failure of material microstructure-an underlying component of practical tools for predicting the fitness of a structural system for the next mission and determining the cause and reconstructing the history of structural failure.In this project we performed the following:(1) Extended the development of a finite element microstructural failure model to simulate damage development in the microstructure of a nickel superalloy. The algorithm can be used in conjunction with continuum/empirical procedures in seeking more accurate predictions of crack growth.(2) Developed and demonstrated a procedure for determining from the fracture surface whether a failed component had experienced overloads, and for estimating the overload magnitude and crack delay. This procedure can be used to help determine the cause and history of a fa...

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Fracture Mechanics of Metals: Some Features of Crack Initiation and Crack Propagation

Krasowsky

2001

Physical Aspects of Fracture

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On a relationship between stretched zone parameters and fracture toughness of ductile structural steels

Cited by 34 publications

References 0 publications

Brittle-to-ductile transition in steels and the critical transition temperature

Brittle-to-ductile transition in steels and the critical transition temperature

Microstructural Failure Physics for Structural Failure Prognosis and Diagnosis

Fracture Mechanics of Metals: Some Features of Crack Initiation and Crack Propagation

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