Generalization of Energy-Based Multiaxial Fatigue Criteria to Random Loading

2008 ◽  
pp. 173-173-18 ◽  
Author(s):  
T Łagoda ◽  
E Macha
Keyword(s):  
Multiaxial Fatigue ◽  
Random Loading

A multiaxial fatigue criterion for random loading

2003 ◽  
Vol 26 (6) ◽  
pp. 515-522 ◽  
Author(s):  
ANDREA CARPINTERI ◽  
ANDREA SPAGNOLI ◽  
SABRINA VANTADORI
Keyword(s):  
Multiaxial Fatigue ◽  
Random Loading ◽  
Fatigue Criterion

scholarly journals Time and frequency domain models for multiaxial fatigue life estimation under random loading

2015 ◽  
Vol 9 (33) ◽  
pp. 376-381 ◽  
Author(s):  
Andrea Carpinteri ◽  
Andrea Spagnoli ◽  
Camilla Ronchei ◽  
Sabrina Vantadori
Keyword(s):  
Fatigue Life ◽  
Frequency Domain ◽  
Multiaxial Fatigue ◽  
Random Loading ◽  
Life Estimation ◽  
Fatigue Life Estimation ◽  
Domain Models

Fatigue Failure Life of SS400 Steel under Non-Proportional Loading in High Cycle Region

2014 ◽  
Vol 891-892 ◽  
pp. 1385-1390
Author(s):  
Takahiro Morishita ◽  
Shu Li Liu ◽  
Takamoto Itoh ◽  
Masao Sakane ◽  
Hideyuki Kanayama ◽  
...  
Keyword(s):  
Low Carbon Steel ◽  
Stress Path ◽  
Fatigue Tests ◽  
Multiaxial Fatigue ◽  
Fatigue Properties ◽  
Low Carbon ◽  
Random Loading ◽  
Proportional Loading ◽  
Strain Stress ◽  
Failure Life

This study discusses fatigue properties of low carbon steel under multiaxial non-proportional loading and an evaluation of failure life. Multiaxial fatigue tests under non-proportional loading with various stress amplitudes were carried out using a hollow cylinder specimen in low and high cycle regions at room temperature. In the test, three types of strain/stress path were employed. They are a push-pull, a reversed torsion and a combined push-pull and reversed torsion loadings in which stress amplitudes used were constant and random. This study evaluates an effect of non-proportional loading on fatigue life in the high cycle fatigue region to discuss the applicability of ΔεNP proposed by Itoh et al. on life evaluations in the high cycle region and under random loading.

Life Prediction Techniques for Variable Amplitude Multiaxial Fatigue—Part 1: Theories

1996 ◽  
Vol 118 (3) ◽  
pp. 367-370 ◽  
Author(s):  
C. H. Wang ◽  
M. W. Brown
Keyword(s):  
Fatigue Damage ◽  
Life Prediction ◽  
Local Strain ◽  
Multiaxial Fatigue ◽  
Critical Plane ◽  
Random Loading ◽  
Variable Amplitude ◽  
Fatigue Damage Accumulation ◽  
Prediction Techniques ◽  
Searching Method

Fatigue life prediction under multiaxis random loading is an extremely complex and intractable topic; only a few methods have been proposed in the literature. In addition, experimental results under multiaxis random loading are also scarce. In part one of this two-part paper, a multiaxial non-proportional cycle counting method and fatigue damage calculation procedure are proposed, which is compared with one published damage-searching method. Both theories are based on critical plane concepts, one being an extension of the local strain approach for uniaxial variable amplitude loading and the other employing a new counting algorithm for multiaxis random loading. In principle, these two methods can be considered as bounding solutions for fatigue damage accumulation under multiaxis random loading.

Determination of the Critical Plane under the Multiaxial Complex Loading

2012 ◽  
Vol 544 ◽  
pp. 182-187
Author(s):  
Lei Wang ◽  
Tian Zhong Sui ◽  
Yu Ma ◽  
Yan Sun
Keyword(s):  
Shear Strain ◽  
Fatigue Behavior ◽  
Fatigue Crack Initiation ◽  
Complex Loading ◽  
Research Field ◽  
Multiaxial Fatigue ◽  
Critical Plane ◽  
Random Loading ◽  
Maximum Shear Strain

Engineering components and structures in service are generally subjected to the multiaxial complex loads. The approach of critical plane has been widely accepted by most researchers as the best method in the multiaxial fatigue research field. It can be used well in the constant multiaxial fatigue loads, but not in the complex loads. Basis on analyzing characteristics of shear strain on material planes, the concept of weight-averaged maximum shear strain plane is proposed. A procedure is presented to determine the critical plane under multiaxial random loading. The angle values of the planes that experience peak values of maximum shear strains are averaged by employing the weight function, which is assumed to take into account the main factors of influencing the fatigue behavior, e.g. fatigue damage. The proposed algorithm is applied to the multiaxial in- and out-of-phase experiments to assess the correlation between the weight-averaged maximum shear strain direction and the position of the experimental fatigue crack initiation plane.

A comparative analysis of multiaxial fatigue models under random loading

2019 ◽  
Vol 182 ◽  
pp. 112-122 ◽  
Author(s):  
Ibai Portugal ◽  
Mireia Olave ◽  
Iker Urresti ◽  
Aitor Zurutuza ◽  
Arkaitz López ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Multiaxial Fatigue ◽  
Random Loading

A New Criterion for Evaluating Multiaxial Fatigue Damage under Multiaxial Random Loading Conditions

2014 ◽  
Vol 891-892 ◽  
pp. 1360-1365 ◽  
Author(s):  
Vitor Anes ◽  
Luís G. Reis ◽  
Manuel de Freitas
Keyword(s):  
User Behavior ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
Multiaxial Fatigue ◽  
Loading Path ◽  
Loading Conditions ◽  
Load Spectrum ◽  
Random Loading ◽  
Loading Paths ◽  
Load Spectra

Generally, mechanical components or structures are subjected to random and a three-dimensional stress state; there are very few field loading paths which can be experimentally fully simulated in laboratory. Loading path parameters such as load sequence, stress level or proportionality/non-proportionality presences are unknown variables with unknown levels under random loading conditions which are impossible to modulate in laboratory because the load spectra is unknown. The load spectrum depends on numerous factors such as environmental, mechanical or user behavior. At design stages the fatigue life estimation is based on typical loading paths or typical loading spectra, however that assumption may be very different from the usage regime. From here it can be concluded that the random multiaxial fatigue issue is of utmost importance to monitoring the in-field damage accumulation. This work presents a proposal to estimate the accumulated damage resulted from multiaxial random loadings based on the SSF equivalent stress and SSF virtual cycle counting concept.

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