scholarly journals Multiaxial fatigue assessment of crankshafts by local stress and critical plane approach

2016 ◽  
Vol 10 (38) ◽  
pp. 47-53 ◽  
Author(s):  
M. Leitner ◽  
F. Grun ◽  
Z. Tuncali ◽  
R. Steiner ◽  
W. Chen
Keyword(s):  
Local Stress ◽  
Multiaxial Fatigue ◽  
Critical Plane ◽  
Fatigue Assessment ◽  
Critical Plane Approach

Outline of the Recent Consolidated Revision of EN13445-3, Clause 18 and Related Annexes: Detailed Assessment of Fatigue Life

2019 ◽  
Author(s):  
Jürgen Rudolph ◽  
Guy Baylac ◽  
Ralf Trieglaff ◽  
Rüdiger Gawlick ◽  
Michael Krämer ◽  
...  
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Assessment Method ◽  
Structural Stress ◽  
Critical Plane ◽  
Fatigue Assessment ◽  
European Working ◽  
Critical Plane Approach ◽  
Detailed Assessment

Abstract The European Pressure Vessel Standard EN 13445 (harmonized Standard acc. to PED 2014/68/EU) provides in its Part 3 (Design) a simplified method for fatigue assessment (Clause 17) and a detailed method of fatigue assessment (Clause 18). While the new revision of Clause 17 has already been adopted, Clause 18 “Detailed Assessment of Fatigue Life” is now available as a consolidated revision in inquiry phase. This major and comprehensive revision has been developed within the framework of the European working group CEN/TC 54/WG 53 – Design methods and constitutes a crucial step towards a modern and user-friendly engineering fatigue assessment method. The overall structure and amendments of Clause 18 are to be presented. All these amendments aim at a significant increase in user friendliness and clear guidelines for application. The following items are to be mentioned in that context: • Fatigue assessment of welded components based on structural stress and structural hot-spot stress approaches, • Detailed guidelines for determining relevant stresses and stress ranges, • Cycle counting proposals in the context of the fatigue assessment method including a critical plane approach. The fatigue assessment of welded components is separated from the fatigue assessment of un-welded parts as it has already been done in previous versions with respective methodological differences. Stress analyses for clause 18 are usually based on detailed finite element analyses (FEA). As an essential amendment for the user, the determination of structural stress ranges for the fatigue assessment of welds is further detailed in a new appropriate annex. Different applicable methods for the determination of structural stresses are explained in connection with the requirements of the finite element models and analyses. The cycle counting issue is comprehensively treated in the context of different design and operation situations (design transients, operational stress-time-histories). The description is detailed towards a critical plane approach. Detailed proposals for implementation in an algorithmic programming framework are given making the described methods ready to use.

scholarly journals Multiaxial Fatigue Life Calculation Model for Engineering Components in Rolling-Sliding Contact

2018 ◽  
Vol 188 ◽  
pp. 02016
Author(s):  
Robert Basan ◽  
Tea Marohnić
Keyword(s):  
Fatigue Life ◽  
Complex Geometry ◽  
Calculation Model ◽  
Multiaxial Fatigue ◽  
Sliding Contact ◽  
Engineering Practice ◽  
Critical Plane ◽  
Principal Axes ◽  
Critical Plane Approach ◽  
Crack Initiation Criterion

Number of important engineering components and elements such as gears, rollers, bearings operate in conditions of rolling-sliding contact loading. Determination of fatigue lives of such components and elements is very important for engineering practice but remains quite chalenging task due to complex states of stress and strain in the material in the vicinity of contact (multiaxiality, non-proportionality, rotation of principal axes, mean compressive stress) as well as complex contact conditions such as loading amplitude, complex geometry of bodies in contact, type of lubrication, value of coefficient of friction, etc. Proposed fatigue life calculation model for cases of rolling-sliding contact is based on critical plane approach in the form of Fatemi-Socie crack initiation criterion. Developed model was implemented in the case of gears teeth flanks in mesh and compared with results and fatigue lives of gears reported in literature. Good agreement was determined confirming validity of developed model. Further advantage of presented approach and developed model is obtained information on critical location(s) and critical plane(s) orientation which can subsequently be used for estimation of crack shapes in initial phases of their growth and later damage type into which they can be expected to develop.

scholarly journals A Strain-based Multiaxial Fatigue Criterion Connected to the Critical Plane Approach

2014 ◽  
Vol 74 ◽  
pp. 317-320 ◽  
Author(s):  
Andrea Carpinteri ◽  
Andrea Spagnoli ◽  
Camilla Ronchei ◽  
Sabrina Vantadori
Keyword(s):  
Multiaxial Fatigue ◽  
Critical Plane ◽  
Critical Plane Approach ◽  
Fatigue Criterion

Multiaxial Fatigue Damage Models

2006 ◽  
Vol 324-325 ◽  
pp. 747-750 ◽  
Author(s):  
De Guang Shang ◽  
Guo Qin Sun ◽  
Jing Deng ◽  
Chu Liang Yan
Keyword(s):  
Shear Strain ◽  
Fatigue Damage ◽  
Multiaxial Fatigue ◽  
Normal Strain ◽  
Critical Plane ◽  
Proportional Loading ◽  
Maximum Shear Strain ◽  
Damage Models ◽  
Thin Tube ◽  
Critical Plane Approach

Two multiaxial damage parameters are proposed in this paper. The proposed fatigue damage parameters do not include any weight constants, which can be used under either multiaxial proportional loading or non-proportional loading. On the basis of the research on the critical plane approach for the tension-torsion thin tubular multiaxial fatigue specimens, two multiaxial fatigue damage models are proposed by combining the maximum shear strain and the normal strain excursion between adjacent turning points of the maximum shear strain on the critical plane. The proposed multiaxial fatigue damage models are used to predict the fatigue lives of the tension-torsion thin tube, and the results show that a good agreement is demonstrated with experimental data.

Multiaxial fatigue assessment using a simplified critical plane-based criterion

2011 ◽  
Vol 33 (8) ◽  
pp. 969-976 ◽  
Author(s):  
Andrea Carpinteri ◽  
Andrea Spagnoli ◽  
Sabrina Vantadori
Keyword(s):  
Multiaxial Fatigue ◽  
Critical Plane ◽  
Fatigue Assessment

scholarly journals The use of a modified critical plane model to assess multiaxial fatigue of steels with nonmetallic inclusions

2019 ◽  
Vol 300 ◽  
pp. 16005
Author(s):  
Pedro Vinícius Sousa Machado ◽  
Lucas Carneiro Araújo ◽  
Marcos Venicius Soares ◽  
José Alexander Araújo
Keyword(s):  
Detrimental Effect ◽  
Nonmetallic Inclusions ◽  
Multiaxial Fatigue ◽  
Critical Plane ◽  
Small Defect ◽  
Metallic Inclusions ◽  
Critical Plane Approach ◽  
Aisi 4140 ◽  
Fatigue Model ◽  
Do So

The goal of this research is to investigate the detrimental effect of non-metallic inclusions on the fatigue strength of the AISI 4140 steel under multiaxial loading conditions. In order to do so, a multiaxial fatigue model based on the critical plane approach is coupled with Murakami’s √area model. The proposed adaptation is very easy to calibrate and can also account for the higher probability of existing a fatal small defect as the volume of stresses material increases. Experimental multiaxial fatigue data were generated and compared with the estimates provided by the adapted multiaxial fatigue model and with its original version. The errors found are not higher than 10%.

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