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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

20302 - Applied mechanics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

International Journal of Structural Integrity

ISSN

1757-9864

e-ISSN

1757-9872

Svazek periodika

11

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

698-709

Kód UT WoS článku

000567048600005

EID výsledku v databázi Scopus

2-s2.0-85074351897