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Title: Measurement of fatigue crack closure for negative stress ratio

Abstract

The concept of fatigue crack closure, introduced in the 60's by Elber, has been used to explain a wide range of positive stress ratio crack propagation results (R {ge} 0). Less attention has been given to fatigue loading for negative stress ratios (R {lt} 0). In this work the results of crack propagation tests of middle-crack tension M(T) specimens of a normalized medium carbon steel DIN Ck 45 for a wide range of stress ratios from 0.7 {ge} R {ge} {minus}3 are presented. Crack closure loads were measured with the compliance technique at test frequency, using a data acquisition system. Negative crack closure loads were found for negative stress ratios R {le} {minus}1, which can explain higher crack propagation rates and accelerations in crack growth during variable-amplitude tests where compressive loads of different stress ratios are present.

Authors:
; ;
Publication Date:
Research Org.:
Polytechnic Inst. of Leiria (PT)
OSTI Identifier:
20005711
Resource Type:
Conference
Resource Relation:
Conference: Second Symposium on Advances in Fatigue Crack Closure Measurement and Analysis, San Diego, CA (US), 11/12/1997--11/13/1997; Other Information: PBD: 1999; Related Information: In: Advances in fatigue crack closure measurement and analysis: Second volume. ASTM special technical publication 1343, by McClung, R.C.; Newman, J.C. Jr. [eds.], 490 pages.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON STEELS; FATIGUE; CRACK PROPAGATION; MECHANICAL TESTS; STRESSES; STRESS INTENSITY FACTORS

Citation Formats

Romeiro, F F.J., Domingos, C A, and Freitas, M J.M. de. Measurement of fatigue crack closure for negative stress ratio. United States: N. p., 1999. Web.
Romeiro, F F.J., Domingos, C A, & Freitas, M J.M. de. Measurement of fatigue crack closure for negative stress ratio. United States.
Romeiro, F F.J., Domingos, C A, and Freitas, M J.M. de. 1999. "Measurement of fatigue crack closure for negative stress ratio". United States.
@article{osti_20005711,
title = {Measurement of fatigue crack closure for negative stress ratio},
author = {Romeiro, F F.J. and Domingos, C A and Freitas, M J.M. de},
abstractNote = {The concept of fatigue crack closure, introduced in the 60's by Elber, has been used to explain a wide range of positive stress ratio crack propagation results (R {ge} 0). Less attention has been given to fatigue loading for negative stress ratios (R {lt} 0). In this work the results of crack propagation tests of middle-crack tension M(T) specimens of a normalized medium carbon steel DIN Ck 45 for a wide range of stress ratios from 0.7 {ge} R {ge} {minus}3 are presented. Crack closure loads were measured with the compliance technique at test frequency, using a data acquisition system. Negative crack closure loads were found for negative stress ratios R {le} {minus}1, which can explain higher crack propagation rates and accelerations in crack growth during variable-amplitude tests where compressive loads of different stress ratios are present.},
doi = {},
url = {https://www.osti.gov/biblio/20005711}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jul 01 00:00:00 EDT 1999},
month = {Thu Jul 01 00:00:00 EDT 1999}
}

Conference:
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