A Multiaxial Fatigue Life Prediction Program

Langlais, T; Vogel, J. H.; Socie, D. F.; Cordes, Thomas S.

doi:10.1016/s1566-1369(97)80010-6

Cited by 2 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two main tasks are awaiting to be solved if the local stresses at the critical location are multiaxial: First, the local multiaxial stress and strain time sequences have to be calculated considering cyclic plastic deformation, and second, these time sequences have to be assessed with regard to their fatigue damage. A fatigue life assessment procedure that covers both of these tasks was first introduced in Langlais et al The 2 main tasks are described more in detail in the next 2 sections.…”

Section: Crack Initiation Under Local Nonproportional Stresses and Stmentioning

confidence: 99%

Fatigue of engineering structures under combined nonproportional loads: An overview

Vormwald

Hertel

Zerres

2018

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

Nonproportionality in fatigue is a matter of loading sequences acting on structures. In such loading cases, a life assessment‐based search of the initiation site is required. This means that for a variety of potential sites, their stress‐strain sequences must be determined and the corresponding fatigue lives have to be calculated. For the determination of local stress‐strain sequences, a superposition of the action of loads at all times for all potential sites must be performed. The superposition has not only to be performed at a particular time of a load reversal but also for a sufficiently large number of intermediate points in time. For the assessment of crack initiation under local nonproportional stress‐strain sequences, a multiaxial fatigue damage hypothesis must be specified. Due to the superiority with respect to accuracy, critical plane approaches are the favourite ones when dealing with nonproportional fatigue of ductile metals. For describing fatigue crack growth, the time sequences for the stress intensity factors corresponding to the 3 opening modes must be obtained by superposition. A mixed‐mode hypothesis must be applied to predict both the direction and the increment of crack growth at each crack front point. A first prediction trial should be based on an appropriate extension of the maximum tangential stress hypothesis. An application of a variant of the maximum shear stress hypothesis might be an amendment. Especially in the case of crack turning, the consideration of crack face contact is mandatory.

show abstract

Section: Crack Initiation Under Local Nonproportional Stresses and Stmentioning

confidence: 99%

Fatigue of engineering structures under combined nonproportional loads: An overview

Vormwald

Hertel

Zerres

2018

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…However, it is unclear which model is able to describe the damage mechanism in this case in a better way. According to this, the proposal is used by simply adding both damage sums [47], Table 4. Four different locations A, B, C and D corresponding to the four weld toes of the investigated welded joint were investigated.…”

Section: Fatigue Life Analysismentioning

confidence: 99%

Numerical fatigue life analysis of a high frequency mechanical impact treated industrial component based on damage mechanics models

Schubnell

Farajian

Däuwel

et al. 2018

Materialwissenschaft Werkst

View full text Add to dashboard Cite

After post weld treatment with high frequency mechanical impact (HFMI) treatment of welds, a significant increase of fatigue life (up to a factor of 10) can be achieved. During the last years numerous experimental tests of welded joints with simple geometry under constant amplitude loading have been performed to quantify the positive effect of high frequency mechanical impact treatment. Due to the lack of methods for the prediction of the high frequency mechanical impact benefits, a widespread use of this process is not the case yet. Furthermore, it is still not clear if the results of these fatigue tests can be transferred to complex geometries and complex loading conditions such as in industrial applications. Therefore, an approach to assess the fatigue life of complex welded structures under variable amplitude loading was developed. For this purpose, high frequency mechanical impact treatment and fatigue load of simple welded specimen made of S690QL steel were simulated with finite element analysis (FEA) firstly. Then, the needed damage parameters for the fatigue life correlation were evaluated from the finite element postprocessing. The calculated life time to crack initiation was in good agreement with the experimental fatigue test results. In the next step, this procedure was implemented on a welded arm of an evacuator of type EW180B of the company Volvo Construction Equipment made of S700MC. The variable amplitude load measured under real service condition was transferred to single constant amplitude load cycles using a rainflow-counting algorithm. By simulation and damage mechanics evaluation of each load cycle the total damage sum could be calculated and compared with the experimental results from Volvo Construction Equipment.Keywords: Fatigue / welding / residual stresses / high frequency mechanical impact (HFMI) / finite element analysis (FEA) Nach einer Schweißnahtnachbehandlung mittels Hochfrequenzhämmern (engl. high frequency mechanical impact treatment (HFMI)) kann eine signifikante Lebensdauerverlängerung des Bauteils (bis zu einem 10-fachen) festgestellt werden. Während der letzten Jahre wurde dieser positive Effekt vielfach experimentell mit einfachen Proben-

show abstract

A Multiaxial Fatigue Life Prediction Program

Cited by 2 publications

References 6 publications

Fatigue of engineering structures under combined nonproportional loads: An overview

Fatigue of engineering structures under combined nonproportional loads: An overview

Numerical fatigue life analysis of a high frequency mechanical impact treated industrial component based on damage mechanics models

Contact Info

Product

Resources

About