Fatigue crack propagation in UFG Ti grade 4 processed by severe plastic deformation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F17%3A00471662" target="_blank" >RIV/68081723:_____/17:00471662 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.ijfatigue.2017.01.028" target="_blank" >http://dx.doi.org/10.1016/j.ijfatigue.2017.01.028</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijfatigue.2017.01.028" target="_blank" >10.1016/j.ijfatigue.2017.01.028</a>

Result language

angličtina

Original language name

Fatigue crack propagation in UFG Ti grade 4 processed by severe plastic deformation

Original language description

Fatigue crack growth was investigated in commercially pure Ti grade 4 processed by severe plastic deformation. The ultrafine-grained structure was prepared by means of equal channel angular pressing technique followed by cold drawing. The growth of fatigue cracks was investigated also in the as-received coarse-grained state of material for comparison.nThe fatigue crack growth rate in the ultrafine-grained material was found to be higher and the threshold stress intensity range delta Kth for crack growth lower than in the coarse-grained Ti, 2.5 and 4.7 MPa m1/2, respectively. A combination of transcrystaline and intercrystaline crack growth was typical for all crack growth rates in the coarse-grained material. Contrary to the combined fracture mechanism in coarse-grained Ti only transcrystalline crack growth was a characteristic feature of crack propagation in the ultrafine-grained material.nIt has been found that the experimentally and theoretically determined values of closure are in reasonable agreement. Crack closure calculated according to the Newman model taking into account only plasticity induced closure was in the range from 67% to 69% of Kmax for as-received and 70% for UFG state of material. Crack closure determined experimentally was 67% of Kmax for as-received and 67% for UFG CP Ti grade 4.nInvestigation of fracture surfaces did not bring any evident signs of the effects of fracture surface morphology resulting in roughness induced closure or oxide induced closure under testing conditions used. This indicates that plasticity induced closure seems to be a dominant closure mechanism in both states of the investigated Ti grade 4.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20306 - Audio engineering, reliability analysis

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

International Journal of Fatigue

ISSN

0142-1123

e-ISSN

—

Volume of the periodical

98

Issue of the periodical within the volume

MAY

Country of publishing house

GB - UNITED KINGDOM

Number of pages

8

Pages from-to

187-194

UT code for WoS article

000398008100018

EID of the result in the Scopus database

2-s2.0-85011407783