Descripción del proyecto
Engranajes infatigables y más duros que el acero
Los engranajes son dispositivos mecánicos simples que se han utilizado durante miles de años para transferir movimiento y fuerzas de torsión entre componentes. Los engranajes de los motores aeroespaciales modernos no son diferentes. Sin embargo, las cargas que soportan son mucho mayores. Existen muchos procesos diferentes para cambiar las propiedades del acero. El endurecimiento por cementación, a menudo llamado endurecimiento superficial, es una de las formas más eficientes de lograr que el acero dure más. El proyecto MatCH4Turbo, financiado con fondos europeos, desarrollará un banco de pruebas que dé lugar a un modelo matemático de los comportamientos del acero endurecido por cementación en un «régimen de fatiga a alto número de ciclos». Permitirá a los ingenieros diseñar engranajes de acero endurecido a prueba de fallos para nuevos motores aeroespaciales.
Objetivo
The objective of this joint effort between WZL of RWTH Aachen and Leibniz-IWT Bremen is to allow the extension of a fail-safe calculation of material life for future case-hardening steels considering the VHCF regime, which is indispensable for the new generation of epicyclic gear applications. To achieve this top-level objective, several sub-objectives have to be completed such as:
a) Develop fast rotating recirculating sub-element test rig for determining tooth root bending strength under reverse bending conditions;
b) Gain material data for two new case hardening steel developments in the VHCF-regime;
c) Develop and validate a VHCF material model.
With respect to the call, the consortium is able to fulfil the requirements of experience in test rig development, manufacture and instrumentation as well as a quality controlled management of facilities and processes for a recirculating rig testing (WZL). The gear test processing includes all aspects of test gear design, instrumentation measurements, measurement uncertainties and limitations. Especially due to the fact, that WZL has a gear testing environment that is already officially approved by aircraft engine producers a high potential for a successful dissemination of the project results into industry is expected. The methods utilise FE-based strength analysis in weakest link models and analysis to ISO 6336 standard (WZL). The consortium is capable to characterise the material and failure mechanisms by residual stress measurement by X-ray diffraction, electron microscopy, and metallography at highest standard as well as to describe material failure phenomena in the VHCF regime through theoretical models (Leibniz-IWT). Based on the combined experiences the collaboration of WZL and Leibniz-IWT allows for a successful derivation of VHCF material model for case hardened gear steels for application in an epicyclic power gearbox.
Ámbito científico
Programa(s)
Régimen de financiación
CS2-RIA - Research and Innovation actionCoordinador
52062 Aachen
Alemania