2024-03-18 23:00:00
In today’s world, more and more efficient and reliable products must be developed in an increasingly short time to guarantee the competitiveness of the company. Environmental laws, sustainable development objectives, lists of prohibited substances/materials as well as price developments and security of supply require reviewing the choice of many materials, which has caused the testing matrix to explode. to achieve. In addition, reducing the weight of parts for economic and/or ecological reasons is an increasingly important issue. In this context, the most successful engineer will be the one with the greatest experience in the field of materials, coatings and lubricants. This experience of a specialist in both materials and tribology is most often virtual. Indeed, a large part of technical failures begin at the contact surface of materials in relative motion; therefore, the tribological behavior of materials and the performance of lubricants and/or coatings in sliding or rolling contact ultimately determine the quality of the initial design. Engineers therefore need rapid access to the most recent experimental knowledge in tribology.
Each year, several tens of thousands of tribological results are obtained internally and published, but two important problems arise:
-
their access still remains difficult, expensive and requires a lot of time;
-
how can we make the most of this data during the design of a product, a machine or the use of a material?
Indeed, most often this great tribological capital remains scattered in a multitude of industrial or university laboratories. Furthermore, the diversity of experimental procedures used and methods of interpretation makes it difficult, if not impossible, to compare the results obtained by the teams of tribologists. Furthermore, material designers, petroleum people, and users speak different languages and have different interests and goals. As a result, the reader is often unable to assess whether the tribological results and properties reported for a pair of dry rubbing materials or a lubricant in a given contact can help solve their specific problem.
The objective of this text is twofold:
-
describe how a tribological database should be organized ;
-
illustrate with examples the use of such a basis to design a tribosystem.
The design of a tribosystem presupposes the organization of a tribological database, then its use to predict the behavior of the tribosystem studied. It should be noted that this use, like the design of a database, is based on a prior theoretical analysis of what a tribosystem is:
-
to identify the key parameters of the system;
-
to establish testing procedures;
-
to create thesauri capable of storing the results of all tests or products.
Note that the situations of rubbing contact are very varied:
-
on the plan cinematic (continuous, alternating sliding with very variable amplitudes, rolling with sliding);
-
in terms of lubrication regimes (mixed/limit lubrication, dry and hydrodynamic).
The information that a database or literature must provide is mainly of two types:
This information can only be used by the engineer and the user to evaluate a priori the in-service operation of the tribosystem and the identified materials, but it does not eliminate testing on mechanical components before implementing a tribological solution.
Five examples present the procedure for estimating the wear rate.
1711180917
#Application #tribological #data #materials #Complete #file