Failure assessment of pressure vessels made of plain carbon steel by using modified inherent flaw model in DL based industry optimization intelligent processing

• Published in: Measurement : journal of the International Measurement Confederation 2020-12, Vol.165, p.108112, Article 108112
• Main Authors: Joemax Agu, M., Gopikumar, S., Vimal, S., Harold Robinson, Y.
• Format: Article
• Language: English
• Subjects: Carbon steels; Crack; Crack initiation; Crack propagation; Cylinders; Damage tolerance; Deep learning; Design modifications; Failure assessment diagram; Failure assessment diagrams; Finite element analysis; Finite element method; Inherent flaw model; Manufacturing defects; Materials failure; Notch strength; Optimization; Optimization algorithms; Optimization intelligent processing; Plastic zones; Pressure vessel; Pressure vessel design; Pressure vessels; Probabilistic methods; Series (mathematics); Structural integrity; Tensile strength
• ISSN: 0263-2241; 1873-412X
• DOI: 10.1016/j.measurement.2020.108112

•Failure Assessment technique for aerospace pressure vessels using simplified technique.•Pre-determined flaw models (IFM) and (FAD) were utilized to determine failures.•Plastic Zone determination generates the Newmans solution.•Failure Assessment Diagrams estimate the notched tensile strength of different cracked geometry. Critical engineering components in the process of designing have employed fail-safe approaches and damage tolerance in industry optimization intelligent processing. Different types of geometrical intricacies were occurring in designing of pressure vessels while considering the parameters. The failures may be due to manufacturing defects or pre-existing flaws present in the cylinder. Even in the probabilistic method of determining failure the structural integrity of the components changes on compressive and tensile loadings. The failures cause the pressure vessels in not adopting its design for the requirement. Normally Inherent Flaw Models (IFM) was used to design wide tensile specimens effectively since the fundamental aspects of material failure can be assessed. DL based Inherent flaw models (IFM) was utilized to generate Failure Assessment Diagrams (FAD) and also to estimate the notched tensile strength of different cracked geometry. IFM is limited only of the wide through cracked tensile specimens. The present work utilizes modified IFM and by converting the pressure vessel failure design data to that of a wide tensile plate by changing its equivalent crack length obtained from an axial crack present in the cylinder. Failure pressure estimation based on fracture criterion is found to be a good coincidence with the data series. Finite Element Analysis (FEA) procedures were utilized to determine plastic zone size of the plate for better validation of the results. Crack Initiation and subsequent growth were identified from the plastic zone.