Multiaxial damage assessment and life estimation: Application to an automotive exhaust manifold

Some mechanical components are subjected to thermo-mechanical fatigue, which occurs when both thermal and mechanical loads vary with time. Due to the complexity of the components geometry, stresses and strains field becomes multiaxial, worsening the fatigue resistance. In this paper several damage models are applied and compared on a case study, an automotive exhaust manifold simulacrum replying the material and the geometrical features of the commercial component. A complete thermo-structural FE analysis has been run and results have been post-processed by means of a numerical code implementing several multiaxial damage models available in literature and based both on a critical plane approach (Kandil-Brown-Miller, Fatemi-Socie) and strain-based models (Von Mises, ASME Code and Sonsino-Grubisic). The model calibration has been carried out by means of literature experimental data referred to commercial exhaust manifolds of similar geometry and material.

[1]  Eric Charkaluk,et al.  Numerical Lifetime Assessment of Engine Parts Submitted to Thermomechanical Fatigue, Application to Exhaust Manifold Design , 2000 .

[2]  Eric Charkaluk,et al.  A computational approach to thermomechanical fatigue , 2004 .

[3]  A. Fatemi,et al.  A CRITICAL PLANE APPROACH TO MULTIAXIAL FATIGUE DAMAGE INCLUDING OUT‐OF‐PHASE LOADING , 1988 .

[4]  A. Druschitz,et al.  Lightweight Iron and Steel Castings for Automotive Applications , 2000 .

[5]  Naohisa Mamiya,et al.  Thermal Fatigue Life of Exhaust Manifolds Predicted by Simulation , 2002 .

[6]  Cristiana Delprete,et al.  Numerical and experimental analysis of exhaust manifold gasket , 2006 .

[7]  S. Manson,et al.  Thermal Stress and Low-Cycle Fatigue , 2020, Encyclopedia of Continuum Mechanics.

[8]  Cristiana Delprete,et al.  Sviluppo di un codice di calcolo per la stima della durata a fatica termomeccanica , 2008 .

[9]  K. Miller,et al.  Biaxial low-cycle fatigue failure of 316 stainless steel at elevated temperatures , 1982 .

[10]  Thomas Seifert,et al.  Fatigue Life Simulation for Optimized Exhaust Manifold Geometry , 2006 .

[11]  Cristiana Delprete,et al.  Sviluppo di un codice di calcolo per la stima della durata a fatica multiassiale , 2009 .

[12]  R. M. Hazime,et al.  Transient Non-linear FEA and TMF Life Estimates of Cast Exhaust Manifolds , 2003 .

[13]  Cetin Morris Sonsino,et al.  A multiaxial fratigue life criterion for non-symmetrical and non-proportional elasto-plastic deformation , 2003 .

[14]  C. Sonsino,et al.  Fatigue Behavior of Cyclically Softening and Hardening Steels Under Multiaxial Elastic-Plastic Deformation , 1985 .

[15]  Donald H. Anderson,et al.  A Thermoviscoplastic FE Model for the Strain Prediction in High Temperature, Thermal Cycling Applications for Silicon Molybdenum Nodular Cast Iron , 1998 .

[16]  D. Socie.  Critical Plane Approaches for Multiaxial Fatigue Damage Assessment , 1993 .

[17]  Huseyin Sehitoglu,et al.  Thermal Fatigue Analysis of Cast Aluminum Cylinder Heads , 2002 .

[18]  Cristiana Delprete,et al.  Exhaust Manifold Thermo-Structural Simulation Methodology , 2005 .