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

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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.

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Abbreviations

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

F max :

Maximum value of the applied load

K :

Absolute temperature (Kelvin)

KIC, KIC(T):

Fracture toughness at room temperature and at temperature T, respectively

K I, max :

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

K t , K f :

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

R p0.2 :

0.2% deformation difference with respect to proportionality stress level

RT:

Room temperature

S275 J2:

Structural carbon steel

T DBT :

Temperature at which the ductile-brittle transition occurs

T NDT :

Temperature above which a metal exhibits ductile behaviour

W :

Specimen width

α[°C−1]:

Thermal expansion coefficient of the material

σ f :

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

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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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  1. Department of Civil and Environmental Engineering & Architecture, University of Parma, Viale G.P. Usberti 181/A, 43100, Parma, Italy

    Andrea Carpinteri & Roberto Brighenti

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  1. Andrea Carpinteri
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  2. Roberto Brighenti
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Correspondence to Roberto Brighenti.

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Carpinteri, A., Brighenti, R. Fracture and fatigue properties of metallic alloys S275 J2 and Al7075 T6 at low temperatures. J Mater Sci 43, 4780–4788 (2008). https://doi.org/10.1007/s10853-008-2675-1

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  • DOI: https://doi.org/10.1007/s10853-008-2675-1

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