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Investigation of Fatigue Strength and Life Prediction for Automotive Safety Components of V-Notched and Un-notched Specimen Part I: Utilization of Waste Materials into Raw Materials

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Abstract

This paper deals with a design of industrial cast-parts and mainly focuses on fatigue life influenced by organic and inorganic particles at different stress levels over a wide range spectrum, which is evaluated and compared. The fracture mechanisms and fatigue strength of V-notch and un-notch specimens are described. The notch factor and notch sensitivity factors have been studied. Porosity is the main factor for crack growth, and it reduces with the addition of waste particles. This combination receives a lot of attention due to its low cost and environmental safety. The micro-/macro-cracks and fracture surface are revealed using SEM and OM analysis.

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Abbreviations

\( b_{o} \) :

Shear fatigue strength exponent

b :

Axial fatigue strength exponent

c :

Axial fatigue ductility exponent

\( c_{o} \) :

Shear fatigue ductility exponent

E :

Modulus of elasticity

G :

Shear modulus

K :

FS parameter material constant

\( K^{{\prime }} \) :

Cyclic axial strength coefficient

\( K_{f} \) :

Fatigue notch factor

\( K_{t} \) :

Elastic stress concentration factor

\( K_{\text{th}} \) :

Threshold stress intensity factor

L :

Critical distance length

N :

Number of cycles

\( n^{{\prime }} \) :

Cyclic axial strain hardening exponent

\( n_{f} \) :

Cycles of failure

\( N_{f,c} \) :

Loading blocks to failure for composite life estimation

\( N_{f,s} \) :

Loading blocks to failure for stable block life estimation

\( N_{f,t} \) :

Loading blocks to failure for transient deformation life estimation

S :

Stress range

\( \varepsilon_{f}^{'} \) :

Axial fatigue ductility coefficient

\( \gamma_{f}^{'} \) :

Shear fatigue ductility coefficient

\( v_{e} \) :

Elastic Poisson’s ratio

\( v_{p} \) :

Plastic Poisson’s ratio

Wsat :

Saturated weight

Wd :

Dry weight

Ws :

Suspended immersed weight

\( \sigma_{f}^{'} \) :

Axial fatigue strength coefficient

\( \sigma_{{n,{ \hbox{max} }}} \) :

Maximum stress normal to analysis plane

\( \sigma_{u} \) :

Ultimate strength

\( \sigma_{y} \) :

Tensile yield strength

\( \sigma_{y}^{'} \) :

Cyclic yield strength

\( \varSigma D_{s} \) :

Damage sum for stable loading block

\( \varSigma D_{t} \) :

Damage sum for transient loading block

\( \tau_{f}^{'} \) :

Shear fatigue strength coefficient

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Authors and Affiliations

  1. Department of Manufacturing Engineering, Annamalai University, Chidambaram, India

    S. Ramanathan & B. Vinod

  2. Department of Mechanical Engineering, SNS College of Engineering, Coimbatore, India

    M. Anandajothi

Authors
  1. S. Ramanathan
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  2. B. Vinod
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  3. M. Anandajothi
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Correspondence to S. Ramanathan.

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Ramanathan, S., Vinod, B. & Anandajothi, M. Investigation of Fatigue Strength and Life Prediction for Automotive Safety Components of V-Notched and Un-notched Specimen Part I: Utilization of Waste Materials into Raw Materials. Trans Indian Inst Met 72, 2631–2647 (2019). https://doi.org/10.1007/s12666-019-01732-x

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  • DOI: https://doi.org/10.1007/s12666-019-01732-x

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