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The FKM-Guideline (german guideline) recomend to use SE=0.3*SUTS for cast aluminum alloys. This value correspond to NE=106 cycles. Please see attached figure (from pg 131 of book "Metal Fatigue Analysis Handbook"), from...

I recommend to continue using the curve called "108 cycles FS=1.8" and don't use the curve called "proportional limit". However, I guess the curve "108 cycles FS=1.8" was obtained by testing and therefore is a fitting of the experimental data. In other words, this mean that this is the mean...

Sachin, See this topic: http://www.eng-tips.com/viewthread.cfm?qid=365623 Although, Ni-Al metal is a singular metal. So, I strongly recommend to get the fatigue properties of this metal through testing.

I totally agree with TGS4!!!

> The following information are valid for high-cycle fatigue (S-N method): For steels and metals in general, the best fatigue criteria are classified in this sequence: 1) Walker model 2) Morrow model 3) SWT model (Smith–Watson–Topper model) For Aluminium and titanium alloys, the best fatigue...

Hi rahul98, The book "Metal Fatigue Analysis Handbook" from Yung-li Lee is the best book that explain about Multiaxial Fatigue. This book explain 3 multiaxial fatigue methods based on critical plane: the Findley method, the McDiarmid method and the Gaier and Dannbauer method. Although, this...

Ninjaz, both nomenclature can be used to describe this type of analysis. The nomenclature "fatigue analysis" appeared first and is used both in academic and industrial environment. The term "durability analysis" was created by the market department of the FE-Based Fatigue Softwares (e.g.: nCode...

If the crack is propagating I imagine there is a cyclic loading in the structure. I think it would be very useful to simulate the structure/joint using Linear Elastic Fracture Mechanics to understand which loads are causing the crack growth and to propose a new joint geometry which avoid crack...

I'm from Brazil. Here we have to study 5 years to become an engineer (undergraduate course). After that, we have to study more 2 years to get the master's degree. But generally, most people go working at industry after the undergraduate course and don't do the master. I've got the master's...

You're welcome. Prof. Darrell Socie and Ali Fatemi may be a good choice as a mentor in the master of PhD studies in Multiaxial Fatigue in the EUA.

Very nice. And at wich university (and country) are you studying? Basically, there are 4 major companies in the world that develop FE-Based Fatigue Softwares: 1) HBM , which develop "nCode DesignLife" 2) Magna PowerTrain, which develop "FEMFAT" 3) Safe Technology, which develop "fe-safe" 3)...

I've got this expression from the book Metal Fatigue Analysis Handbook (equation 4.41), and the book's authors say they got this equation from FKM-Guideline. I haven't realized this but yes, there's something wrong with the equation; I think the authors made a mistake when they wrote the book. I...

Hi chucknessiv, Yes, exactlly. The MATLAB routine reads the position of the nodes, the connectivity matrix, read the stresses (or strains) over the time, apply the rainflow (both the 3 point uniaxial rainflow from ASTM and Wang&Brown), search for the critical plane using one of the critical...

Welcome to the forum Kat0430! There are 3 global methods that solve fatigue problems: The S-N Method The EPSILON-N Method The Linear Elastic Fracture Mechanics Only the Linear Elastic Fracture Mechanics can predict the remaining life of a structure/component. I suggest you to use this...

Hi SlipperyPete and welcome to the forum! 1) Regarding the temperature factor, use this equation to calculate the temperature factor for ALUMINUM ALLOYS: For T<=50oC use => CT = 1.0 For T>50oC use => CT = 1- 0.0012.(T-50)2 This specification is the one speficied by FKM-Guideline. 2) I...

Hi Nidhi143 and welcome to the forum! I know just one material that explain in detail the fatigue analysis of bolted joints. Is the chapter 12 of the book: Metal Fatigue Analysis Handbook: Practical problem-solving techniques for computer-aided engineering Yung-Li Lee, Mark E. Barkey, Hong-Tae...

Welcome chucknessiv! Last year I created my own multiaxial fatigue software and one of the criteria used was the Findley (a multiaxial fatigue critical plane model). I created the software in MATLAB. It read the matrix of nodes and the the Connectivity Matrix of a mesh (created for example in...

Hi api503! I don't want to dishearten you, but FE-Based Fatigue Analysis, which is the fatigue analysis using the results of stress (or strain) of a FE analysis, is a really hard issue! I've just got my Master of Science degree in this subject and it took me 3 years of intense study...

Thanks realtime2 for contribute with this very usefull fatigue material database. The professionals at Waterloo university did a great job. I also reccommend to use the fatigue properties database created and managed by Darrell Socie: www.efatigue.com . There are dozens of material properties...

Hi tiguy64, I extract the following values from ASM Metals Handbook: Material: A316 Hardness: 71-77 HRB Product Condition: ST Fatigue strength coefficient: 660 MPa Fatigue strength exponent: -0.079 Fatigue ductility coefficient: 0.341 Fatigue ductility exponent: -0.453 This values were...