Surface Fatigue & Nuclear Weld Life Extension
Laser Peening without Coating (LPwC) Calculator
Model Laser Peening without Coating (LPwC) and water-jet guided laser peening. Calculate plasma shock pressure ($P_{\text{peak}}$), compressive residual stress depth, spot overlap density ($C_{\text{peen}}$), and CAM scan trajectories.
Process & CAM Parameters
Nanosecond laser pulse energy in Joules (J).
FWHM pulse duration in nanoseconds (ns).
Focused circular or square spot size on surface in mm.
Spatial raster overlap between successive laser pulses in %.
Engineering Calculations
Laser Pulse Irradiance
4.97GW/cm²
Peak Shock Pressure
3.48GPa
Compressive Stress Depth
1.45mm
Effective Peening Coverage
333%
Dynamic CAM Toolpath & Vector Preview
Need complete manufacturing prepress guidance and formulas?
Read the Full LPwC Prepress Guide →Engineering Principles & Formulations
Laser Peening without Coating (LPwC) utilizes short nanosecond Nd:YAG laser pulses ($I > 3\text{ GW/cm}^2$) directed through a laminar water confinement layer directly onto bare metal surfaces without sacrificial tape or black paint coating.
Governing shock equations:
- Fabbro Water-Confined Shock Pressure: $$P_{\text{peak}} = 0.01 \sqrt{\frac{\alpha}{2\alpha + 3} Z I_0} \quad [\text{in GPa}]$$ where $Z \approx 0.15\times 10^6\text{ g}/(\text{cm}^2\cdot\text{s})$ is the reduced acoustic impedance of water-metal interface.
- Hugoniot Elastic Limit (HEL): Compressive plastic deformation occurs when $P_{\text{peak}} > 2 \times \text{HEL}$.
- Water-Jet Guided Beam (Laser MicroJet): A laminar water jet acts as an optical waveguide, delivering de-ionized water confinement and laser energy co-axially.