Descrizione del progetto
Instancabili, girano e girano, più duri dell’acciaio
Gli ingranaggi sono semplici dispositivi meccanici usati da migliaia di anni per trasferire movimento e coppia tra i componenti. Gli ingranaggi dei moderni motori aerospaziali non sono diversi, tuttavia, i carichi che sopportano sono enormi. Esistono molti processi diversi per cambiare le proprietà dell’acciaio. L’indurimento, spesso chiamato tempra superficiale, è uno dei modi più efficienti per rendere l’acciaio più duraturo. Il progetto MatCH4Turbo, finanziato dall’UE, svilupperà un banco di prova che porterà ad un modello numerico dei comportamenti di indurimento dei materiali nel regime di «fatica a ciclo molto elevato». Esso permetterà agli ingegneri di progettare ingranaggi in acciaio temprato a prova di guasto per i nuovi motori aerospaziali.
Obiettivo
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.
Campo scientifico
Programma(i)
Meccanismo di finanziamento
CS2-RIA - Research and Innovation actionCoordinatore
52062 Aachen
Germania