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Fatigue Design of Components by G. Marquis and J. Solin (Eds.)

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By G. Marquis and J. Solin (Eds.)

This quantity features a collection of papers provided at Fatigue layout ninety five held in Helsinki, Finland from 5-8 September 1995. The papers were peer reviewed and current sensible elements for the layout of elements and constructions to prevent fatigue failure. issues lined comprise: fatigue layout studies, floor motor vehicle parts, part reliability, multiaxial fatigue, notch research, provider loading, welded constructions, probabilistics facets in fatigue, fatigue layout optimization.

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Therefore any loading cycle, with various stress ratios, can be predicted with these coefficients using the Dan Van model. The result of the calculation is a value of a so called safety factor (Sf). This factor can be defined as the normalised smallest distance of the loading path in the (T ; p) Dang Van diagram to the damage line. When Sf is greater than 1 the component is supposed to be safe. On the contruary when Sf of some elements become less than unity, failure may occur. Isovalues of the safety factors are presented on Fig.

The curve was obtained through a statistical analysis using the ESOPE code with a failure probability of 50%. Fatigue Life Assessment Methodology for Automotive Components 23 2600 T 2400 I 2200 I 2000 I 1800 I 1600 I • 1400 \ 1200 l,00E+03 l,00E+04 • -h H- H l,00E+05 l,00E+06 l,00E+07 Nf (cycles) Fig. 6. Wohler curve on the test component subjected to Fx loading at R = - 0,5 (load vs cycles). From these experimental results, the fatigue limit of the suspension arm under uniaxial loading condition and with a stress ratio R = - 0,5 is about 1 450 daN.

E. E. analysis. E. calculations were undertaken on the test part. A model with shell elements was used. The fatigue test performed on the part were simulated in the following way : The loading is in the plane of the suspension arm as a simulation of braking and acceleration (Fx). It is applied on the central node E (Fig. 3). loading boundary condition Fig. 3. Shell elements mesh and boundary conditions The boundary conditions in the neighbourhood of the attachment points A and B are representative of the test rig.

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