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We analyzed the internal stress tensor components. For the $E_cut = 200$ eV case, we observed substantial fluctuations in the off-diagonal components (shear stress), even under uniaxial tension. This "noise" superimposes onto the physical stress concentration at the crack tip, reducing the effective critical stress intensity factor ($K_IC$) required to propagate the crack. ecut crack
While the convergence of total energy with respect to $E_cut$ is a standard practice, the convergence of stress tensors and interatomic forces is often overlooked. A common misconception is that an energy convergence threshold of 1 meV/atom is sufficient for all derived properties. However, mechanical properties such as bulk modulus, yield strength, and fracture toughness are derived from the second and third derivatives of the total energy, making them significantly more sensitive to the basis set size than the total energy itself. While it might be tempting to download a