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In computational materials science, Density Functional Theory (DFT) serves as the bedrock for predicting material properties. However, the accuracy of these predictions is intrinsically linked to numerical convergence parameters, most notably the plane-wave kinetic energy cutoff ($E_cut$). This paper investigates the phenomenon of "Ecut cracking"—a term describing the spurious mechanical failure or structural instability observed in simulations employing insufficient cutoff energies. Through a systematic analysis of bulk silicon and alpha-quartz, we demonstrate that low $E_cut$ values introduce artificial stress inhomogeneities and erroneous bond stiffness, leading to unphysical fracture initiation at stress levels significantly below experimental values. We propose a protocol for $E_cut$ convergence testing specifically tailored for mechanical property calculations to prevent these numerical artifacts. ecut crack