Thermomechanical fatigue design of aluminium components

Verger, Laetitia; Constantinescu, Andréï; Charkaluk, Éric

doi:10.1016/s1566-1369(02)80087-5

Cited by 8 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…12 These results demonstrate that the different hypothesis and simplifications about uncoupling mechanical behavior and damage seem to be sufficient for this type of TMF design. This was also illustrated by Verger et al 11 in the case of aluminium alloys cylinder heads and Sermage et al 25 for biaxial steel specimens.…”

Section: Experimental and Computed Resultssupporting

confidence: 54%

Fatigue design of structures under thermomechanical loadings

Charkaluk¹,

Bignonnet

Constantinescu

et al. 2002

Fatigue Fract Eng Mat Struct

Self Cite

108

View full text Add to dashboard Cite

This paper presents a global approach to the design of structures that experience thermomechanical fatigue loading, which has been applied successfully in the case of cast-iron exhaust manifolds. After a presentation of the design context in the automotive industry, the important hypotheses and choices of this approach, based on a thermal 3D computation, an elastoviscoplastic constitutive law and the dissipated energy per cycle as a damage indicator associated with a failure criterion, are first pointed out. Two particular aspects are described in more detail: the viscoplastic constitutive models, which permit a finite element analysis of complex structures and the fatigue criterion based on the dissipated energy per cycle. The FEM results associated with this damage indicator permit the construction of a design curve independent of temperature; an agreement is observed between the predicted durability and the results of isothermal as well as non isothermal tests on specimens and thermomechanical fatigue tests on real components on an engine bench. These results show that thermomechanical fatigue design of complex structures can be performed in an industrial context

show abstract

Section: Experimental and Computed Resultssupporting

confidence: 54%

Fatigue design of structures under thermomechanical loadings

Charkaluk¹,

Bignonnet

Constantinescu

et al. 2002

Fatigue Fract Eng Mat Struct

Self Cite

108

View full text Add to dashboard Cite

show abstract

“…The design protocol used today has been established for AlSi7Cu0.5Mg0.3 T7 aluminum alloy that is widely used for Groupe PSA cylinder heads [11]. Such components can experience operating temperatures that can exceed 250 • C in some critical areas and thus the precipitation treatment temperature.…”

Section: Methodsmentioning

confidence: 99%

“…The commonly used design protocol and particularly the way over-aging is considered in the constitutive model, was defined for AlSi7Cu0.5Mg0.3 T7 aluminum alloy that was widely used for PSA cylinder heads [11]. To evaluate the relevance of a constitutive model and establish its choice, it is mandatory here to re-examine thermal aging.…”

Section: Constitutive Models and Aging Conditionsmentioning

confidence: 99%

Some Recent Advances on Thermal–mechanical Fatigue Design and Upcoming Challenges for the Automotive Industry

Szmytka

Osmond

Rémy

et al. 2019

Metals

View full text Add to dashboard Cite

Automotive industry faces numerous evolutions regarding environment regulations and parts reliability. Through the specific case of a cylinder head, actual and forthcoming challenges for low-cycle and thermal–mechanical fatigue design in an industrial context are presented. With a description of current design approaches and highlighting limitations, this work focuses on variable loadings, constitutive models and their interaction with the environment, fatigue criteria, and structure validations, the four major steps to meet a reliable design. The need to carry out extended experimental databases for different complexity levels is emphasized to provide a better understanding of loadings and their impact on the strength of materials and structures, as well as the production of more physically-based models that are easier to identify and lead to higher levels of reliability in the thermal–mechanical design process.

show abstract

“…It considers a dissipated energy per cycle as a damage indicator associated with a failure criterion 24 . This approach was successfully applied in the automotive industry 24–28 …”

Section: Introductionmentioning

confidence: 99%

A continuum damage model applied to high‐temperature fatigue lifetime prediction of a martensitic tool steel

Velay¹,

Bernhart²,

Delagnes³

et al. 2005

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

A B S T R A C T High-temperature operational conditions of hot work tool steels induce several thermomechanical loads. Depending on the processes, (i.e. forging, die casting or extrusion), stress, strain, strain rate and temperature levels applied on the material are nevertheless very different. Thus, lifetime prediction models need to be able to take into account a broad range of working conditions. In this paper, a non-isothermal continuum damage model is identified for a widely used hot work tool steel AISI H11 (X38CrMoV5) with a nominal hardness of 47 HRc. This investigation is based on an extensive high-temperature, lowcycle fatigue database performed under strain rate controlled conditions with and without dwell times in the temperature range 300-600 • C . As analysis of experimental results does not reveal significant time-dependent damage mechanisms, only a fatigue damage component was activated in the model formulation. After normalization, all fatigue results are defined on a master Woehler curve defined by a nonlinear damage model, which allows the parameter identification. Last, a validation stage of the model is performed from thermomechanical fatigue tests.Keywords continuum damage mechanics; fatigue life prediction; high-temperature fatigue; tempered martensitic steels; Woehler curve. N O M E N C L A T U R E D = fatigue damage value a, β, M, α, b = fatigue model parameters < u > = u.H(u), the McCauley brackets with H the Heaviside function N R = number of cycles to failure σ M = mid-life maximal stress σ m = mid-life minimal stress ε p = mid-life strain range σ = mid-life mean stress σ = mid-life stress range S m = reduced mid-life minimal stress S M = reduced mid-life maximal stress S = reduced mid-life stress range σ u = ultimate stress σ l = fatigue limit σ l 0 = fatigue limit for zero mean stress I N T R O D U C T I O NHot work tool steels undergo very critical thermomechanical loads that are usually very hard to evaluate from an Correspondence: V. Velay. experimental point of view and whose levels strongly depend on the location on the structure. Numerical simulation seems to be adequate to reach this information in order to optimize the tool design and to improve their lifetime. For that purpose, several preliminary stages are necessary. First of all, a cyclic elasto-viscoplastic behaviour model has to be identified in order to provide stress-strain

show abstract

Thermomechanical fatigue design of aluminium components

Cited by 8 publications

References 0 publications

Fatigue design of structures under thermomechanical loadings

Fatigue design of structures under thermomechanical loadings

Some Recent Advances on Thermal–mechanical Fatigue Design and Upcoming Challenges for the Automotive Industry

A continuum damage model applied to high‐temperature fatigue lifetime prediction of a martensitic tool steel

Contact Info

Product

Resources

About