Fatigue life prediction of titanium alloy for block loading using the hybrid approach of critical plane and continuum damage mechanics

Abstract

The present study is related to the performance analysis of the newly proposed fatigue estimation model for titanium alloy BT9 against block loading. Lately, research efforts have been concentrated on developing the capability to handle complex multiaxial loading conditions for fatigue estimation. The current study is focused on testing the proposed hybrid approach involving the critical plane and continuum damage mechanics. The calibration of the proposed model is done by determining the model coefficients by using a genetic algorithm. Experimental fatigue lives for titanium alloy BT9 with block loading consisting of axial, torsion and out-of-phase axial-torsion loading segments are considered to analyse the accuracy of the proposed model. The proposed model is validated by using finite element analysis to estimate fatigue life for titanium alloy BT9. Simplifications were assumed to handle the block loads, and axial, torsion and out-ofphase loading conditions were used for calibration. The estimated fatigue life results show good agreement with published results for block loads.

Fatigue properties of strained very thin 304 stainless steel sheets

“…The tensile test is a method used to evaluate the structural response of steel to applied force with the result expressed as a relationship between stress and strain. The current study follows several previous researches that had dealt with macroscopic and microscopic behaviour and fatigue properties of pre-hardened austenitic stainless steel [26][27][28][29].Plastic deformation during forming can lead to deformation-induced transformation from the original ductile austenite phase to a stronger martensite [30][31][32][33]. In general, the formation of martensite depends on chemical composition, temperature, stress state, strain and strain rate [34][35][36].…”

Investigation and optimization for the dynamical behaviour of the vehicle structure

“…In the first method, which is termed as advanced CAE model, the detailed geometry of all components are considered, while in the second approach (conceptual modelling) only basic frames and initial dimensions are taken into consideration. Due to fast performance computations need of industry, the conceptual modelling method is still an attractive research area for the automotive CAE investigations [1][2][3][4]. Recently, considerable studies have been devoted to this subject, which is motivated greatly by its advantages in vehicle parts modeling [5][6][7].…”