The combined micro- and macro-fracture mechanics approach to engineering problems of strength

Pisarenko, G. S.; Krasowsky, A.Ya.; Vainshtock, V.A.; Kramarenko, I. V.; Krasiko, V. N.

doi:10.1016/0013-7944(87)90051-8

Cited by 9 publications

(6 citation statements)

References 15 publications

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“…Formula (4) which establishes the relation between fracture toughness and the yield stress can be an example of such relationship. As it has already been mentioned, with the proviso that a change in the yield stress is not caused by changes in the material structure, many experimental evidences were obtained of the validity of formula (4). In support of the above-stated, other works can be mentioned in which relation (4) in one or another particular case was substantially experimentally verified.…”

Section: Relation Of Fracture Toughness To Other Characteristicssupporting

confidence: 60%

“…The comprehensive thermodynamic definition of the temperature and strain rate influence upon the plastic flow stress as well as upon the fracture toughness, Krc, of low carbon steel with the grain size d = 0.034 mm revealed the relation (4) with n' = -1.5, which corresponds to the work hardening exponent n = 0.25. It follows from this work [25] that in the low temperature plateau range the value of K,, ,, 5 …”

mentioning

confidence: 95%

“…The results of this investigation have been published in work [25]. The comprehensive thermodynamic definition of the temperature and strain rate influence upon the plastic flow stress as well as upon the fracture toughness, Krc, of low carbon steel with the grain size d = 0.034 mm revealed the relation (4) with n' = -1.5, which corresponds to the work hardening exponent n = 0.25.…”

mentioning

confidence: 99%

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Minimal Resistance of Engineering Materials to Brittle Fracture as Predicted by Local Approach

Krasowsky¹,

Pluvinage

1996

J. Phys. IV France

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Abstract. Two basic concepts of brittle fracture are considered: the first involving stage-by-stage interatomic bonds decohesion at the crack tip, the second -microcrack coalescence. Quantitative evaluation has been made of the material threshold and minimal fracture toughness values which correspond to the above concepts. The paper presents the analysis of methods for the experimental evaluation of two main structure parameters, which govern the material fracture, and discloses their physical meaning. These are the characteristic distance and cleavage stress. It also considers the methods of a priori express-evaluation of the materials fracture toughness from their conventional mechanical characteristics.

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Section: Relation Of Fracture Toughness To Other Characteristicssupporting

confidence: 60%

mentioning

confidence: 95%

mentioning

confidence: 99%

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Minimal Resistance of Engineering Materials to Brittle Fracture as Predicted by Local Approach

Krasowsky¹,

Pluvinage

1996

J. Phys. IV France

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“…Toth et al 8 credit Kalthoff 130 with developing the fracture mechanics concept of dynamic impact response curves and their connection with impact fracture toughness measurements. A continuing research activity is to connect the microstructural aspects of fracturing with macroscopic engineering performances, for example, as investigated by Pisarenko et al 131 who have provided an estimation of the fracture toughness dependence on temperature and strain rate. The researches have important consequences for control of neutron irradiation embrittlement in the nuclear power industries, as was the case for the initial investigations of Cottrell 121 and Petch 122 and as was true for later reviews provided both by Wechsler 132 and by Landes, 133 both giving emphases to testing standards and in the latter case, drawing attention to the comparison of static and dynamic fracture toughness measurements, as shown in Fig.…”

Section: Ductile-brittle Transition and Fracture Toughness Propertiesmentioning

confidence: 99%

High strain rate properties of metals and alloys

Armstrong¹,

Walley²

2008

International Materials Reviews

309

122

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The high strain rate dependence of the flow stress of metals and alloys is described from a dislocation mechanics viewpoint over a range beginning from conventional tension/compression testing through split Hopkinson pressure bar (SHPB) measurements to Charpy pendulum and Taylor solid cylinder impact tests and shock loading or isentropic compression experiment (ICE) results. Single crystal and polycrystal measurements are referenced in relation to influences of the crystal lattice structures and nanopolycrystal material behaviours. For body centred cubic (bcc) metals, the strain rate sensitivity (SRS) is in the yield stress dependence as compared with the face centred cubic (fcc) case of being in the strain hardening property. An important consequence is that an opposite ductility influence occurs for the tensile maximum load point strain that decreases with strain rate for the bcc case and increases with strain rate for the fcc case. Different hexagonal close packed (hcp) metals are shown to follow either the bcc or fcc case. A higher SRS for certain fcc and hcp nanopolycrystals is explained by extrapolation from conventional grain sizes of an inverse square root of grain size dependence of the reciprocal activation volume determined on a thermal activation strain rate analysis (TASRA) basis. At the highest strain rates, additional deformation features enter, such as deformation twinning, adiabatic shear banding and very importantly, for shock induced plasticity, transition from plastic flow that is controlled by the mobility of the resident dislocation density to plasticity that is controlled by dislocation or twin generations at the shock front. The shock description is compared with the very different high rate shockless ICE type loading that occurs over nanoseconds and leads to higher compressive strength levels because of dislocation drag resistance coming into play for the originally resident mobile dislocation density. Among the high strain rate property, concerns are the evaluation of ductile to brittle transition behaviours for bcc and related metals and also, projectile/target performances in ballistic impact tests, including punching. Very complete metallographic and electron microscope observations have been reported in a number of the high rate deformation investigations.

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“…Other workers have attempted to determine material properties fractographically [21,22,23,24]. The blunting that occurs at the tip of a fatigue precrack when a fracture toughness specimen is loaded to failure manifests itself on the fracture surfaces, producing a stretch zone with clear boundaries, namely a distinct width (stretch zone width, SZW) and height (stretch zone height, SZH).…”

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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The combined micro- and macro-fracture mechanics approach to engineering problems of strength

Cited by 9 publications

References 15 publications

Minimal Resistance of Engineering Materials to Brittle Fracture as Predicted by Local Approach

Minimal Resistance of Engineering Materials to Brittle Fracture as Predicted by Local Approach

High strain rate properties of metals and alloys

Microstructural Failure Physics for Structural Failure Prognosis and Diagnosis

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