Fatigue Life Prediction Using Virtual Strain Gauge for Backing Strip Full Penetration Weld Joint
Gopalan Venkatachalam a, Atul R Deshmukh b, A. Raja Annamalai c, Vignesh Pragasam d, Gokula Krishnan Balasubramanian a, Vijay Venkataraman e and Chun-Ping Jenf
aSchool of Mechanical Engineering, Vellore Institute of Technology, Chennai, India.
bCentre of Expertise, JCB India Limited, Pune, India.
cCentre for Innovative Manufacturing Research, VIT, Vellore, India.
dSchool of Mechanical Engineering, Vellore Institute of Technology, Vellore, India.
eByford equipment Pvt Ltd, Derrimut, Victoria, Australia.
fSchool of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, R.O.C. Department of Mechanical Engineering and Advanced Institute of Manufacturing for High-Tech Innovations, National Chung Cheng University, ChiaYi, Taiwan, R.O.C.
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Abstract:
This paper focuses on the fatigue life estimation of backing strip full penetration weld joint by means of the virtual strain gauge and its validations via fatigue experiment. Currently, many commercial software packages are supporting stress-strain analysis using the finite element method but it is significant to validate the obtained results with experiment and established methodology. The finite element analysis is employed to predict the fatigue life by considering three input parameters such as the applied load (Ld), root gap (Rg) and thickness of the plate (Pt). Effect of input effect plot which is based on Response Surfaceparameters on response parameter i.e. fatigue life is analyzed through main Methodology, a Design of Experiments approach, with 20 set of experimentation and results are experiments. validated by performing the actual fatigue Based on virtual and actual experiments, it is observed that plate thickness is directly proportional to the fatigue life whereas load is inversely proportional. But root gap from 2mm to 3 mm is showing the negligible effect but after 3mm it is showing inverse effect on fatigue life. The use of design of experiments approach for the fatigue life estimation without performing the experimental validation will be extremely useful in upcoming future works and it also minimizes the time and cost.
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