Publication

MilliNewton – dérive due aux contraintes dans la brasure

Thomas Maeder
2007
Reports

Abstract

Dérive de l'offset du signal de sortie des poutres MilliNewton (1ère version, avec variantes), assemblées sur embase sans électronique par brasure tendre sans plomb Sn96 (96.5% Sn + 3.5% Ag), lors de tests à long terme. Quarante poutres MilliNewton, version 1, ont été brasées sur embase sans électronique, et leur offset a été mesuré lors de tests à long terme impliquant quelques cycles thermiques entre température ambiante et 85 ou 100°C. Trois paramètres ont été explorés : 1) La longueur de la plage de brasure principale ; 2) la distance entre les résistances de mesure et la brasure ; 3) le pré-étamage de cette plage ou non. Seule la distance résistances – brasure joue un rôle important : l'effet des contraintes dans la brasure se fait fortement sentir à des distances en dessous de 2.0 mm. La dérive se fait en général (mais pas toujours) surtout sentir au 1er cycle thermique. Ensuite, on observe une certaine stabilisation.

Official source

https://infoscience.epfl.ch/entities/publication/72ad299e-0aae-434c-a804-67e7edaf7a37

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Thomas Maeder
2007
Reports

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/72ad299e-0aae-434c-a804-67e7edaf7a37

About this result

Related concepts (2)

Newton (unit)

The newton (symbol: N) is the unit of force in the International System of Units (SI). It is defined as 1 kg⋅m/s^2, the force which gives a mass of 1 kilogram an acceleration of 1 metre per second per second. It is named after Isaac Newton in recognition of his work on classical mechanics, specifically Newton's second law of motion. A newton is defined as 1 kg⋅m/s^2 (it is a derived unit which is defined in terms of the SI base units).

Surface tension

Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible. Surface tension is what allows objects with a higher density than water such as razor blades and insects (e.g. water striders) to float on a water surface without becoming even partly submerged. At liquid–air interfaces, surface tension results from the greater attraction of liquid molecules to each other (due to cohesion) than to the molecules in the air (due to adhesion). There are two primary mechanisms in play.