Overload effects on fatigue behaviour and life prediction of low-carbon steels
TL;DR: In this article, a life prediction model under variable-amplitude loading was proposed to predict the fatigue crack initiation (FCI) life of low carbon steels with non-continuous strain-hardening characteristics.
About: This article is published in International Journal of Fatigue.The article was published on 1995-01-01. It has received 23 citations till now. The article focuses on the topics: Fatigue limit.
Citations
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TL;DR: In this paper, the basic fatigue formula, the criterion for omitting small loads, the rule for cumulative fatigue damage, and models for predicting the fatigue crack initiation (FCI) life and probability distribution under variable-amplitude loading are comprehensively studied and summarized.
92 citations
TL;DR: In this article, the influence of load variations on delamination shapes in Fibre Metal Laminates has been investigated and an explanation is put forward in order to understand the effects of variable amplitude loading on the formation of delamination shape.
70 citations
TL;DR: In this paper, a constant amplitude analytical prediction model for Fibre Metal Laminates has been extended to predict fatigue crack growth under variable amplitude loading using the modified Wheeler model based on the Irwin crack-tip plasticity correction and effective stress intensity factor range (ΔKeff).
46 citations
TL;DR: In this article, the fatigue tests under variable amplitude loading were carried out on the notched elements of 45 steel with non-continuous hardening characteristics to investigate the small load-omitting criterion (SLOC).
43 citations
TL;DR: In this paper, the performance of the notched friction welded (FW) joints of 45 (0.45%C) carbon steel was analyzed under constant-amplitude loading (CAL) and variableamplitudes loading (VAL).
32 citations
References
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TL;DR: In this article, the load interaction effect of large stress cycles on the fatigue behavior of subsequent smaller cycles was investigated on an aluminium alloy and the results indicated that small cycles, including those below the constant-amplitude fatigue limit, can contribute significantly to damage accumulation, and therefore small cycles should not be ignored when predicting fatigue lives.
50 citations
TL;DR: In this paper, the predicted fatigue crack initiation lives of welded plate T-joints in air and seawater environments are reported and compared with experimental data from Canadian offshore steel research.
23 citations
01 Feb 1989
TL;DR: In this article, an analysis of variance was performed on aluminum alloys under realistic cyclic load histories and in service-like environments and the results provided a significant contribution to the understanding of aircraft corrosion fatigue and should encourage further investigation in this difficult and challenging area of aerospace technology.
Abstract: : Failure by fatigue and degradation by corrosion continue to be major considerations aircraft design. Environmental effects influence both initiation and propagation of fatigue cracks, and dynamic loading may cause more rapid deterioration of corrosion protection systems. Therefore the conjoint action of dynamic loading and environmental attack, i.e., corrosion fatigue, requires special attention. Many corrosion fatigue tests have been done on aluminum alloys. However, few included critical structural details like joints, under realistic cyclic load histories and in service-like environments. Even fewer used practical corrosion protection systems. These aspects are specifically addressed by the FACT programme and its predecessor CFCTP programme. The results provide a significant contribution to the understanding of aircraft corrosion fatigue and should encourage further investigation in this difficult and challenging area of aerospace technology. Keywords: Corrosion fatigue; Aluminum alloys; Joints (Junctions); Corrosion prevention; Analysis of variance; Chi square test; International cooperation; Aircraft; Fatigue tests; Cyclic loads; Load transfer; Secondary bending ratio; Statistical tests. NATO furnished.
23 citations
TL;DR: In this paper, Zheng et al. used the linear damage accumulation rule to predict the FCI life of 16 Mn steel butt welds under variable amplitude loads and a good agreement was achieved between the predicted results and the test data.
Abstract: Fatigue test results of 16 Mn steel butt welds without crack-like defect under both constant and variable amplitude loads are reported and new procedures are used to predict fatigue crack initiation (FCI) life, fatigue crack propagation (FCP) life and total life of the butt welds. The results indicate that the FCI life and FCP life should be calculated separately and the total life is the sum of the FCI life and FCP life. For the butt welds investigated, stress cycles to initiate a crack of engineering size may occupy more than 70 percent of the total life of the butt welds and it is more suitable to express the total life as a power function of the equivalent stress amplitude {ie275-1}. In predicting the FCI life, the expression of FCI life obtained from the test results of notched specimens is used but the effects of microstructure, surface condition, macro- and micro-geometrical discontinuities at weld toe should be taken into account. In predicting the FCP life, the formula developed by Zheng and Hirt is used and the stress ratio is taken as 0.6 to account for the residual stresses effect on the FCP rate. Because overload produced by the maximum load in a load spectrum has no effect on the FCI life of 16 Mn steel and weldment of the steel, according to the procedures outlined in the paper, one can use the FCI life expression mentioned and the linear damage accumulation rule proposed by Miner to predict the FCI life of 16 Mn steel butt welds under variable amplitude loads. A good agreement is achieved between the predicted results and the test data.
20 citations