Determination of permissible defect size for solid axles loaded under fully-reversed rotating bending

The present paper summarizes the results from uniaxial-tension stress-controlled fatigue tests performed at different temperatures up to 650°C on Cu-Be specimens. Two geometries are considered: hourglass shaped and plates weakened by a central hole (Cu-Be alloy). The motivation of the present work is that, at the best of authors' knowledge, only a limited number of papers on these alloys under high-temperature fatigue are available in the literature and no results deal with notched components. The Cu-Be specimens fatigue data are re-analyzed in terms of the mean value of the Strain Energy Density (SED) averaged over a control volume. Thanks to the SED approach it is possible to summarize in a single scatter-band all the fatigue data, independently of the specimen geometry.

Section: Introductionmentioning

confidence: 99%

Extension of linear elastic strain energy density approach to high temperature fatigue and a synthesis of Cu-Be alloy experimental tests

Berto¹,

Gallo²

2015

“…Since the critical distances of sharp crack for the MTS and MS criteria are normally assumed to be the material properties, they have been frequently used also for notches of different shapes (Ayatollahi & Torabi, 2010a, 2010bTorabi, 2013d;Torabi et al, , 2014dTorabi & Amininejad, 2015aTorabi & Aliha 2013;Torabi & Pirhadi 2015;Torabi & Abedinasab, 2015a. For U-shaped notches, the critical distances can be written as …”

Section: Computing the Critical Distances Of Umts And Ums Criteria Fomentioning

confidence: 99%

Large plasticity induced crack initiation from U-notches in thin aluminum sheets under mixed mode loadin

Torabi¹,

Hosseini²

2017

Ductile failure is investigated experimentally and theoretically in U-notched Al 7075-T6 thin sheets under mixed mode I/II loading. First, several U-notched rectangular sheets are subjected to mixed mode I/II failure tests and the load-carrying capacity of the sheets are experimentally recorded. Then, the Equivalent Material Concept (EMC) is employed in conjunction with the U-notch maximum tangential stress (UMTS) and U-notch mean stress (UMS) criteria to theoretically estimate the load-carrying capacity of the U-notched Al 7075-T6 sheets. It is shown that the experimental failure loads are well predicted by means of both the UMTS-EMC and UMS-EMC criteria. Moreover, the experimental observations and the elastic-plastic finite element analyses indicate that the U-notched aluminum sheets fail by the large-scale yielding (LSY) regime.

“…The crack can initiate from the surface or at a depth below the surface depending on the material processing conditions or from the stress concentrators such as pre notches, cracks, holes and etc. (Torabi & Aliha, 2013). Fatigue test using constant amplitude loading is a commonly practiced to predict the fatigue life properties of materials.…”

Section: Cae Fatigue Life Prediction By Ansysmentioning

confidence: 99%

Fatigue life prediction: A comparative study for a three layer EN45A parabolic leaf spring

Kumar¹,

Aggarwal²

2015

There are literally several studies accomplished to predict the fatigue life of leaf springs but estimation of fatigue life of a parabolic leaf spring by using CAE tools has not yet been executed in the past. Parabolic spring is an important component in a vehicle suspension system. It needs to have excellent fatigue life and in today's scenario manufacturers rely on constant loading fatigue analysis. The objective of this work is to perform the fatigue analysis of parabolic leaf spring by three different methods where CAE analysis is performed to observe the distribution of stress fatigue life and damage using Goodman approach. In this work, fatigue life of the parabolic leaf spring is determined as per SAE spring design manual and experimentally by testing on full scale fatigue testing machine. ANSYS is used for CAE solution for the prediction of leaf springs fatigue life considering stress theory. The fatigue life estimated by all three modes is then compared for the purpose of validation. The methodology used in this paper brings a practical approach to the professionals in the industries who are engaged for design of mechanical components.