Document Type
Paper
Keywords
portable device, infrastructure, residual stress, fatigue
DOI
10.5703/1288284317934
Location
STEW 206
Start Date
24-9-2025 9:10 AM
Abstract
Laser peening (LP) introduces compressive residual stress (RS) onto the surface of metallic materials using nanosecond laser pulses irradiated through a water layer, thereby effectively suppressing fatigue crack initiation. However, conventional LP systems require large, stationary setups, restricting their use to indoor environments. To overcome this limitation, a portable LP device featuring a finger-sized microchip laser mounted on a collaborative robot arm has been developed. Equipped with a compact power supply and a water circulation/recovery system, the device can operate on-site with minimal setup. Successful processing across various materials has confirmed both compressive RS induction and fatigue life extension. Notably, the portable LP device can be used on members subjected to dead load (their own weight) after installation at construction sites. This helps to counteract tensile stress and enhance fatigue performance, as demonstrated by in situ LP experiments on HT780 fatigue samples.
Included in
Engineering Mechanics Commons, Manufacturing Commons, Mechanics of Materials Commons, Other Engineering Science and Materials Commons
Expansion Of Laser Peening Application With A High-Power Microchip Laser On A Robotic Arm
STEW 206
Laser peening (LP) introduces compressive residual stress (RS) onto the surface of metallic materials using nanosecond laser pulses irradiated through a water layer, thereby effectively suppressing fatigue crack initiation. However, conventional LP systems require large, stationary setups, restricting their use to indoor environments. To overcome this limitation, a portable LP device featuring a finger-sized microchip laser mounted on a collaborative robot arm has been developed. Equipped with a compact power supply and a water circulation/recovery system, the device can operate on-site with minimal setup. Successful processing across various materials has confirmed both compressive RS induction and fatigue life extension. Notably, the portable LP device can be used on members subjected to dead load (their own weight) after installation at construction sites. This helps to counteract tensile stress and enhance fatigue performance, as demonstrated by in situ LP experiments on HT780 fatigue samples.