Data and code for Induced-contact stability and activation thresholds near double compliant grazing

This record contains numerical data, Python source code and reproducibility documentation supporting the manuscript "Induced-contact stability and activation thresholds near double compliant grazing" by Takashi Matsuhisa. The simulations concern a centred pendulum-slider system with continuously engaging compliant stops near separated quadratic grazing contacts. The archive includes independently computed periodic solutions with one and two enabled contacts, monodromy matrices and Floquet multipliers, contact heights and mean forces, and comparisons with asymptotic predictions for the second-contact activation threshold. It also contains cancellation-path calculations, forcing-frequency comparisons demonstrating contact induction and suppression, and transverse-damping comparisons of the full six-dimensional spectral radius. Earlier return-map, observable-response and boundary-propagation calculations are retained. Data_and_Code.zip contains the model and input parameters, Python scripts, numerical records in JSON and CSV, figure-generation code, figures in PDF and PNG, and numerical-methods documentation. The cancellation study includes 36 cases, and the transverse-damping study includes nine matched branch pairs across three solver settings. A fresh-extraction reproduction completed 143 declared checks, including 45 comparisons with fixed reference values. To reproduce the calculations, extract the archive, install the dependencies listed in requirements.txt in a Python 3.9 or later environment, and run sh run_all.sh from the extracted directory. The calculations do not require LaTeX. The README and numerical-methods documents describe the solver settings, units, scaling conventions and output files. These data were generated by deterministic numerical simulation. The comparisons assess floating-point reproducibility and asymptotic agreement; they do not provide interval-certified bounds or experimental validation. This release accompanies a manuscript prepared for journal submission.