PSI - Issue 37

Jesús Toribio et al. / Procedia Structural Integrity 37 (2022) 977–984 Jesús Toribio / Procedia Structural Integrity 00 (2021) 000 – 000

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6. Conclusions 1. This paper proposes new steps towards a novel concept of structural integrity offering a multi-scale approach comprising and covering all length scales : giga -, mega- , macro -, micro- and nano- structural integrity. 2. With regard to engineering failure analyses, many times smaller scales of structural integrity affect bigger scales ( local loss of structural integrity affecting global loss of it). 3. In aircraft or aerospace engineering failure analysis, the loss of structural integrity of very small units such as bolts, fasteners or wires might lead to catastrophic failures of the plane and fatal accidents. 4. The aforesaid multi-scale approach was succesfully applied by Toribio (2020b) studying unconventional pearlitic pseudocolonies affecting macro- , micro- and nano-structural integrity of cold-drawn pearlitic steel wires. 5. The innovative idea of material structural integrity (or, simply, material integrity ) is also proposed in the conceptual framework of materials science and engineering. 6. The concept of structural integrity is extended to immaterial structures (literature and musical works), introducing a new, innovative concept of immaterial structural integrity . 7. The concept of structural integrity is broadened to the psychological field to comprise, in addition, the idea of personal structural integrity or, simply, personal integrity (psychological strength, character, …) 7. Epilogue: Between Leonardo da Vinci and Galileo Galilei This paper is aimed towards a new concept of structural integrity, so that his author wishes to pay tribute to the Italian genius, artist and engineer, Leonardo da Vinci (Figs. 10) whose pioneering fracture experiments of steel wires constitute a key event in the field of fracture mechanics and structural integrity. Fig. 10 also shows one of his most famous drawings, the Vitrubian man .

Fig. 10. Statue of Leonardo da Vinci and the drawing Vitrubian man . In addition, the paper wishes to pay a heartfelt tribute to another Italian genius, Galileo Galilei (Fig. 11), physicist and mathematician, who can be considered as the father of fracture mechanics after his experiments on fracture of wooden cantilever beams. In addition, Fig. 11 shows a scheme of such test to evaluate the strength of materials (wood in particular). It is included in his book Dimostrazioni Matematiche (the cover is also shown in Fig. 11).