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Journal of Materials Science

, Volume 43, Issue 14, pp 4780–4788 | Cite as

Fracture and fatigue properties of metallic alloys S275 J2 and Al7075 T6 at low temperatures

  • Andrea Carpinteri
  • Roberto BrighentiEmail author
Article

Abstract

Knowledge of the fracture and fatigue behaviour of metallic alloys at extreme environmental temperature conditions is required to assess the safety of structural components operating in particular fields: aero-spatial, off-shore structures, power plants superconductors, polar Antarctic facilities, etc. Among the structural metallic alloys for civil, mechanical engineering and plant applications, steel S275 J2 is widely used, whereas aluminium alloys such as Al7075 T6 are significant especially for aero-spatial and polar Antarctic applications. In this paper, the main experimental mechanical characteristics of such metallic materials at room temperature as well as at low temperatures are examined. Three temperatures are considered: 293 K (+20 °C, room temperature RT), 243 K (−30 °C) and 193 K (−80 °C). The corresponding values of fracture toughness and endurance limit available in the literature are reported herein. Further, experimental tests have been performed to determine the unavailable mechanical properties. Then, the values of such fracture and fatigue parameters at various temperatures are critically discussed.

Keywords

Fatigue Fracture Toughness Crack Growth Rate Fatigue Limit Fatigue Behaviour 

Nomenclature

a

Mean value of crack length during the test

A

Cross-sectional area of the specimen

Al 7075 T6

High-strength aluminium alloy

b,c

Material’s constants in Peterson and Neuber relations for notch sensitivity, respectively

CG

Crack growth

°C

Temperature (Celsius)

D

Specimen diameter

E

Young modulus of the material

Fmax

Maximum value of the applied load

K

Absolute temperature (Kelvin)

KIC, KIC(T)

Fracture toughness at room temperature and at temperature T, respectively

KI, max

Stress-intensity factor at the maximum value of the applied load

Kt, Kf

Stress concentration factor and fatigue strength reduction factor, respectively

N

Number of loading cycles

NDT

Nil ductility transition

PQ, Pmax

Applied loads defined according to ASTM B645-02

q = (Kf − 1)/(Kt − 1)

Notch sensitivity factor of the material

r

Notch root radius

R

Loading ratio

Rp0.2

0.2% deformation difference with respect to proportionality stress level

RT

Room temperature

S275 J2

Structural carbon steel

TDBT

Temperature at which the ductile-brittle transition occurs

TNDT

Temperature above which a metal exhibits ductile behaviour

W

Specimen width

α[°C−1]

Thermal expansion coefficient of the material

σf

Endurance limit

σmax, σm

Maximum and mean value of the applied stress during a cycle

σy, σu

Yield stress and ultimate stress of the material

ν

Poisson ratio of the material

Notes

Acknowledgements

The authors gratefully acknowledge the research support for this work provided by the Italian Ministry for University and Technological and Scientific Research (MIUR) and the Italian National Research Council (CNR). Further, the authors gratefully acknowledge the valuable cooperation of Dr. D. Magagnini by RTM Breda srl, V. Po 84, 20032 Cormano, Milan, Italy.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of Civil and Environmental Engineering & ArchitectureUniversity of ParmaParmaItaly

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