FE analysis of strain constraint around the crack tip under cyclic loading

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F20%3A00356790" target="_blank" >RIV/68407700:21340/20:00356790 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1108/IJSI-10-2018-0065" target="_blank" >https://doi.org/10.1108/IJSI-10-2018-0065</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1108/IJSI-10-2018-0065" target="_blank" >10.1108/IJSI-10-2018-0065</a>

Result language

angličtina

Original language name

FE analysis of strain constraint around the crack tip under cyclic loading

Original language description

Purpose The purpose of this paper is to deal with the FE analysis of strain constraint around the crack tip under cyclic loading and its utilization using crack growth prediction strip yield model (SYM). During cycling, the constraint develops based on the load history. The monotonic loading is analyzed mostly, but during cyclic loading the conditions are different. The constraint is analyzed after several loading cycles applied in upwards part of the cycle and the formula for its development is proposed. Design/methodology/approach The study is based on the 3D FE analysis of middle-cracked tension specimen M(T). The strain constraint is described by Newman's factor alpha. The variability of constraint factor alpha was analyzed for several load levels and specimen thicknesses. The crack is considered as non-propagating with straight crack front. The material is modelled as elastic-perfectly plastic. The SYM is modified by implementing variable constraint and the experimental results are compared with the simulation. Findings In major part of the loading cycle, it was found by FE analysis, that the constraint factor alpha(g)is lower after overloads than when creating monotonic plastic deformation on the same load level. The value of alpha(g)is governed by the ratio of thicknessBover the plastic zone sizer(p). By implementing the variable constraint factor into the SYM, the improvement of the predicted specimens lives under variable amplitude loading was shown. Originality/value The new phenomenon on the variability of strain constraint during cyclic loading is presented. The development of constraint factor alpha(g)during cyclic loading is different from the monotonic loading and should be accordingly implemented into prediction models.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

—

OECD FORD branch

20302 - Applied mechanics

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

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

Name of the periodical

International Journal of Structural Integrity

ISSN

1757-9864

e-ISSN

1757-9872

Volume of the periodical

11

Issue of the periodical within the volume

5

Country of publishing house

GB - UNITED KINGDOM

Number of pages

12

Pages from-to

698-709

UT code for WoS article

000567048600005

EID of the result in the Scopus database

2-s2.0-85074351897