PDF | The FKM guideline for analytical strength assessment of mechanical components has gained an increasing interest for the last decade in the industry, . PDF | In the German Research Association of Mechanical Engineering ( FKM) will present a new guideline for calculating the fatigue crack initiation life of . Download as PDF, TXT or read online from Scribd. Flag for inappropriate This FKM-Guideline was elaborated under contract between. Forschungskuratorium.
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FKM GUIDELINE “FRACTURE MECHANICS PROOF OF STRENGTH The guideline describes basics for the integrity assessment of cracked components. The FKM guideline for analytical strength assessment of mechanical components has gained an increasing interest for the last decade in the industry, because it. The FKM guidelines. – Analytical strength assessment , and. – Fracture mechanics proof of strength for engineering components  were developed in the.
Fkm guideline pdf
The influence of an elevated temperature is allowed for by means of temperature factors, Chapter 2. Design parameters to be considered in particular are the fatigue notch factors, allowing for the design of the component shape, size and type of loading , as well as the roughness factor and the surface treatment factor, by which the respective surface properties are accounted for.
By specific combination of all these factors a summary design factor is calculated, Chapter 2. The nominal values of the component fatigue limit for completely reversed stresses follow from the derived fatigue limit values of the material, divided by the respective design factors, Chapter 2.
From these fatigue limit values the amplitudes of the component fatigue limit according to the mean stress values or the stress ratios are to be derived, Chapter 2.
The amplitudes that specify the variable amplitude fatigue strength of the component are obtained from the fatigue limit values multiplied by a factor depending on the parameters of the stress spectrum total number of cycles and amplitude frequency distribution , Chapter 2. The basic value of the safety factor is 1,5.
Under favorable conditions this safety factor may be reduced, Chapter 2. The degree of utilization for an individual stress component or type of stress is the ratio of its nominal characteristic service stress amplitude, divided by the allowable amplitude of the component fatigue limit or of the component variable amplitude fatigue strength.
The allowable 9 This assessment of the static strength for welded components is according to DIN 18 part 1. As far conditionally weldable steel, stainless steel, weldable cast iron materials or weldable aluminum alloys are concerned, the rules of DIN 18 are provisional and may be applied with caution only. The interaction formula to be applied to that combination allows for the ductility of the material in question, that is in the same way as for the assessment of the static strength, Chapter 2.
For the assessment of the fatigue strength of welded components using nominal stresses basic fatigue limit values for completely reversed stress are given. They are independent of the tensile strength of the base material which is different to non-welded components.
They are converted by design factors that follow from a classification scheme of structural weld details. Relevant material properties are to be determined as for nominal stresses, Chapter 3.
Design parameters are the section factors, by which an experienced partial plasticity of the component is allowed according to yield strength, type of loading, and shape of the component.
The section factors are calculated on the basis of Neuber's formula, but by observing individual upper bound values that follows from the plastic limit load plastic notch factor. From the.
The local values of the static component strength are derived from the tensile strength, divided by the respectiveoverall design factor, Chapter 3. The safety factors are to be determined as for nominal stresses, Chapter 3.
As far as conditionally weldable steel, stainless steel, weldable cast iron materials or weldable aluminum alloys are concerned this kind of calculation is provisional and may be applied with caution only.
The distinction is only a formal one, however, and the procedure of calculation is the same in all cases.
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Specific particulars apply to welded components. Some new examples and case studies are included to demonstrate the application of the procedure to engineering problems. This paper gives an overview of the guideline and describes new features available since its 1st edition. IIW-Thesaurus keywords This is a preview of subscription content, log in to check access. Preview Unable to display preview. Download preview PDF.
Google Scholar  BS Guide on methods for assessing the acceptability of flaws in metallic structures, British Standards Institution, Google Scholar  Paris P. Basic Engineering 85, , — Google Scholar  Vormwald M. Google Scholar  Vormwald M.
Google Scholar  Dankert M. Google Scholar  Erdogan F.
Google Scholar  Richard A. Google Scholar  Richard A. Google Scholar  Dhondt G. Gudas, J.
Joyce and E.In the general case block-shaped 3D components are to be calculated using local stresses. The interaction formula to be applied to that combination allows for the ductility of the material in question, Chapter 1. Long term values of the static strength are - - for age-hardening aluminum alloys: E The constant KNL.
ANALYTICAL STRENGTH ASSESSMENT
As a rule a restriction to the following kinds of stress spectra is possible: The related maximum and minimum values are Smax.. Google Scholar  Paris P. For normal temperature the temperature factors are Table 1.
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