The objective of this study is to give a general overview on the thermoplastic adhesives used in the automotive sector. Some of the main applications in which the hot-melt adhesives (HMAs) are used in automotive industries are indicated, together with the adhesive characteristics that explain the reasons for their adoption. The chemical and mechanical behavior of these adhesives and the generally used experimental characterization methods are presented and opportunely criticized. In this study, some of the main properties of thermoplastic adhesives are reviewed together with the standard tests used for their characterization. For what concerns the structural performance, single lap joint test is used to determine the shear strength of the adhesive joint. Thermogravimetric analysis and Fourier transform infrared spectroscopy are used to characterize the chemical properties of the adhesive. This study clarifies what are the potentialities of a thermoplastic adhesive in car industries compared to other adhesives.
SHRNUTI
Tlumiče jsou zakladni časti zavěšeni vozidel. Zavěšeni kola zajišťuje spravne chovani vozidla a pohodli řidiče. Pro optimalni využiti adheze při pohonu i brzděni je nutne, aby sily mezi pneumatikou a vozovkou byly pokud možno ustalene. Žadne z kol by nemělo ztratit kontakt s vozovkou. Pohodli znamena, že vibrace od profilu vozovky se budou jen minimalně přenašet do kabiny na cestujici. Při navrhu noveho vozidla, je velke usili věnovano spravnemu naladěni podvozku - volbě vhodnych parametrů tuhosti a tlumeni.
Članek představuje některe vysledky z experimentalnich zkoušek provaděnych na třech tlumičich od vyrobce Magneti -Marelli, ktere jsou v současne době ve vyrobnim programu. Experimenty byly provaděny při nahodnem buzeni. V zavislosti na charakteristikach, ktere zobrazuji sily v zavislosti na kinematickych veličinach (posun, rychlost, zrychleni) byl pomoci metody “black box” vyvinut matematicky model odezvy tlumiče.
Vliv tlumiče na vlastnosti vozidla jsou analyzovany pomoci sledovani odezvy vozidla na polyharmonicke buzeni.
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