RCsumh- O n d t c r i t une nouvelle m t t h o d e d'analyse des pics d e frottement i n t i r i e u r e n fonction d e la temperature. Elle permet d'obtenir une approximation d u spectre des temps d e relaxation responsables d u pic. O n montre que cette m i t h o d e , a p p e l i e analyse directe d u spectre (DSA), s'applique I diffirents types d e spectres: (i) elle fournit des approximations d e certaines formes d e spectre qui reproduisent la position, l'amplitude, la largeur et l a

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... avec une bonne pricision, q u i est d e l'ordre d e 10% (ii) elle ne conduit pas I d e s approximations aliatoires d e la forme spectrale des pics. Abstract -A new method for analysis o f a n internal friction vs temperature peak t o obtain a n approximation of the spectrum of relaxation times responsible for the peak is described. This method, referred t o a s direct spectrum analysis (DSA), i s shown to provide a n accurate estimate o f the distribution of relaxation times. T h e method is validated for various spectra, a n d i t is shown that: (i) I t provides approximations to known input spectra which replicate t h e position, amplitude, width and shape with good accuracy (typically 10%). (ii) It d o e s not yield approximations which have false spectral peaks.