Prévenir l’Effet de «Galling» sur l’Acier Inoxydable : Un Guide Pratique

Boulon ayant été victime de galling.

 

L’acier inoxydable est réputé pour sa résistance à la corrosion, sa durabilité et sa polyvalence dans une multitude d’applications industrielles. Cependant, même ce matériau robuste n’est pas à l’abri d’un phénomène frustrant et potentiellement destructeur connu sous le nom de « galling ».

 

Qu’est-ce que le galling?

Le galling, ou adhérence à frottement élevé, est un phénomène qui se produit lorsqu’il y a un contact agressif entre deux surfaces en acier inoxydable sous une charge de frottement élevée, créant ainsi une friction excessive qui peut entraîner le collage, l’usure et même la rupture des pièces. Ce contact de friction intense, combinée à la pression entraîne un transfert de matériau d’une surface à l’autre, ce qui cause un effet de micro-soudure. Cet effet peut conduire à un collage indésirable. Si on continue la friction, ce collage peut s’intensifier ce qui peut éventuellement rendre les pièces inutilisables et détruire les filets du boulon et son récepteur. Ce phénomène peut survenir dans diverses conditions, des environnements secs aux environnements contenant des liquides, et peut compromettre gravement l’intégrité des assemblages mécaniques.

Dans cet article, nous explorerons en profondeur ce qu’est le galling, les mécanismes qui le provoquent et les stratégies efficaces pour le prévenir.

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What is Lorem Ipsum?

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry’s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.

 

Why do we use it?

It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using ‘Content here, content here’, making it look like readable English. Many desktop publishing packages and web page editors now use Lorem Ipsum as their default model text, and a search for ‘lorem ipsum’ will uncover many web sites still in their infancy. Various versions have evolved over the years, sometimes by accident, sometimes on purpose (injected humour and the like).

 

Where does it come from?

Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of « de Finibus Bonorum et Malorum » (The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, « Lorem ipsum dolor sit amet.. », comes from a line in section 1.10.32.

The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested. Sections 1.10.32 and 1.10.33 from « de Finibus Bonorum et Malorum » by Cicero are also reproduced in their exact original form, accompanied by English versions from the 1914 translation by H. Rackham.

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