Every slider and dropdown above is reflected here — change any input and this diagram updates with it, so you can see the whole configuration at a glance instead of reading each field separately.

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Try "Front only" and watch the Center row: a one-sided treatment can measurably shorten the untreated surface's life via the self-equilibrating counter-stress the compressive layer requires. Try "Both" to see why treating both sides (or reaching full depth) avoids that trade-off.

Each small chart sweeps one variable across its full slider range while holding every other input at its current value above — so you can see which variables actually move the needle on fatigue life, and which barely matter. Green = edge (front, tension near the clamp), red = center (back, tension at the impact point). Y-axis is cycles to failure, log scale. The current value of each variable is marked with a vertical line.

Modulus is the single driving term behind every result below: this sweeps face modulus E from 70% to 130% of the Ti-6Al-4V baseline (16.5 Msi) — independent of any specific named alloy — holding thickness, speed, ball, and peening settings at their current values above. Green dashed line = Ti-6Al-4V (16.5 Msi); purple dashed line = T9S+ baseline (15.0 Msi); red dashed line = whatever modulus is currently active above (including a custom override, if enabled).