Determination of plastic collapse load of pre-cracked Small Punch Test specimens by means of response surfaces

摘要: Abstract In a previous research paper, new methodology was developed to estimate the fracture toughness of 15.5PH stainless steel, one that combines Failure Assessment Diagram (FAD), procedure for evaluating structural integrity cracked components, along with load–displacement curve obtained from pre-cracked specimens using Small Punch Test (SPT), non-standard test is commonly used when there not enough material conducting standard tests in order obtain mechanical and properties materials. One steps this determination plastic collapse load P U specimen by carrying out complicated elastic–plastic finite element analysis (FEA). avoid FEA step, an expression obtaining SPT paper. This can be without need numerical simulation calculated applying response surface techniques based on design experiments materials whose behavior described Ramberg–Osgood type equation. The yields as determined dimensions material’s elastoplastic parameters encompasses typical range steels.