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The crack growth resistance of thin steel sheets under eccentric tension

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Abstract

The stable crack growth in thin steel sheets is the topic of this paper. The crack opening was observed using a videoextensometry system, allowing the crack extension determination. JR-curve and δR-curve were established from obtained data. The ductile tearing properties of different thin sheets of steel were determined, including the impact of the specimen orientation, from test performed on compact tension specimens loaded under two conditions. The effect of the material, the rolling direction, and loading rate on the crack growth resistance of thin steel sheets was analyzed. In addition to the crack growth resistance, J-integral values for crack initiation were also estimated. The relation between J i and J0.2 was assessed using the basic mathematical and statistical methods. This relation was described by a linear regression model.

Keywords

Cold-formed steel thin sheet stable crack growth R-curve videoextensometry 

List of symbols

A

area under the load–displacement curve

A80

elongation (initial length 80 mm)

a

crack length

a0

initial crack length

aSZ

stretch zone height

Δa

crack propagation

α

parameter, values vary from 1 to 20

B

thickness

CMOD

crack mouth opening displacement

CT

compact tension

CTOD (δ)

crack tip opening displacement

δ0

CTOD at which stretch zones appear on fracture surfaces

δi

critical CTOD for ductile crack initiation

δR-curve

CTOD resistance curve

dCTOD/da

slope of δR-curve

DP

dual-phase steel

dJ/da

slope of JR-curve

E

Young’s modulus

HR 45

microalloyed steel

IF

interstitial free steel

J-integral

line integral (path-independent) around the crack tip

Ji

value of J-integral for observable crack initiation

JR-curve

J-integral resistance curve

J0.2

value of J-integral of conventional crack initiation for 0.2 mm crack propagation

Re

yield strength

Rm

tensile strength

Rp0.2

0.2% offset yield strength

SEM

scanning electron microscopy

SZ

stretch zone

T

tearing modulus

V

notch opening

W

width

wSZ

stretch zone width

z

distance of measurement point from the load-line

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.Technical University of KošiceKošiceSlovak Republic

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