AEROSPACE FASTENER FATIGUE & PEENING

Ultrasonic Torsional Thread Root Peening Calculator

Calculate ultrasonic torsional shear micro-peening amplitude ($\theta_0$), deep compressive residual stress penetration ($z_{\text{comp}}$), thread root stress concentration ($K_t$) reduction, and High-Cycle Fatigue (HCF) life multipliers.

1. Fastener & Acoustic Tooling

Fastener Thread Specification

Fastener Alloy Material System

Ultrasonic Torsional Frequency ($f$ in kHz)

Torsional acoustic transducer resonance frequency.

Acoustic Tip Angular Amplitude ($\theta_0$ in degrees)

Peak-to-peak torsional oscillatory displacement at the root contact pin.

Tungsten Carbide Micro-Pin Radius ($r_{\text{pin}}$ in mm)

Nose radius of the peening contact probe (must be $\le$ root radius).

Pneumatic Static Downforce ($F_{\text{static}}$ in N)

Clamping preload force against the thread root valley.

2. Stress & Fatigue Enhancement Output

Peak Surface Compressive Stress

-780MPa

Compressive Depth (z_comp)

0.42mm

Kt Stress Concentration

2.15(-38%)

HCF Fatigue Life Gain

5.2xcycles

Root Burnish Roughness (Ra)

0.12µm

Helical CAM Lead Angle (β)

2.42°

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