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The fracture toughness (FT) of thin ductile metallic plates is not an intrinsic property but varies with thickness, sometimes in a significant way. For metals with pronounced strain hardening capacity and sufficiently large fracture strain, the FT of the sheet increases with thickness, reaches a peak, and then levels off to attain the plane strain plateau (Figure 1). Despite the potential benefits for designing lighter yet tougher thin-walled structures, understanding the controlling factors and predicting the positive effects of thickness dependency have rarely been explored in the past. In this context, an experimental investigation is conducted on thin SS316L sheets of varying thicknesses (from 1.5 to 8mm) to identify the key factors influencing the FT. SS316L has a high strain hardening exponent and is expected to reach the maximum value of FT at an ap-proximate thickness of 10mm. To this aim, double-edge notched tension (DENT) specimens with different ligament lengths were tested (both interrupted and fully fractured test). The es-sential work of fracture (EWF) methodology is employed, enabling the separation of necking and damage work in the localized fracture process zone (FPZ) from the plastic work expended in the diffused plastic zone (DPZ) [1]. The results for SS316L are compared to those obtained for SS304LN, as well as to 3D finite element simulation of crack growth relying on an advanced nonlocal model [2], to identify the key parameters that affect the peak FT.
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Mohtadifar, N., Colla, M.-S., Kaniadakis, A., Nguyen, V. D., Noels, L., Jacques, P., & Pardoen, T. (2024). Thickness effect on fracture toughness of thin austenite stainless steel sheet. ECF24 - European Conference on Fracture 2024, Zagreb, Croatia. https://hdl.handle.net/2078.5/260599