Laser Shock Peening Residual Stress Patents 2026
Laser Shock Peening Residual Stress Technology Landscape
Laser shock peening (LSP) uses high-intensity pulsed laser energy to impart deep compressive residual stresses into metallic components, extending fatigue life by 2–17× across aerospace, nuclear, and additive manufacturing sectors. Patent filings in this dataset span 1995 to 2025 across six identifiable technology sub-domains.
From Laboratory Demonstration to Commercial Aerospace and Additive Manufacturing
Laser shock peening operates by directing short-duration (10–30 nanoseconds) high-peak-power laser pulses through an optically transparent confining water curtain onto an ablative coating. The resulting plasma pressure exceeds the Hugoniot elastic limit of the target, inducing compressive residual stresses (CRS) extending well beyond 1 mm in depth — significantly deeper than conventional shot peening or ultrasonic impact peening.
Peak compressive residual stresses reported across retrieved literature range from −200 MPa for ceramics to −1,170 MPa for additively manufactured stainless steel post-processed by LSP. Typical affected depths are 0.5–1.5 mm in aluminum and titanium alloys. Fatigue life improvements of 2–17× are reported in aerospace components including compressor blades, turbine airfoils, and fuselage fastener holes.
The technology has matured through three distinct innovation phases: a foundational era (1995–2003) anchored by General Electric and LSP Technologies, a diversification era (2003–2018) incorporating quality assurance, medical devices, and expanded alloy coverage, and a current application-broadening era (2018–2025) focused on additive manufacturing integration, machine learning optimization, and ultrafast pulse regimes.
In this dataset, the US and EP are the primary filing jurisdictions for commercially active LSP patents. General Electric Company holds at least 14 distinct retrieved filings — the largest single assignee count in this dataset — though most are now inactive, substantially reducing IP barriers for new entrants in core nanosecond LSP process space.
Filing Trends and Technology Cluster Distribution in Retrieved LSP Records
Analysis of retrieved patent and literature records reveals a three-phase innovation trajectory spanning 1995–2025, with strong early concentration in US foundational filings and a recent shift toward additive manufacturing, AI-driven optimization, and emerging-economy assignees in India and China.
LSP Patent Filings by Technology Cluster — Retrieved Records (Dataset Snapshot)
In this dataset, conventional nanosecond LSP with water confinement and ablative coating accounts for the largest share of retrieved patent entries, followed by process variants including LPwC, WLSP, and in-situ AM-integrated approaches.
↗ Click bars to exploreLSP Patent Filings by Innovation Phase and Jurisdiction — Dataset Snapshot
In this dataset, filing activity peaks in the foundational era (1995–2003) driven by US-domiciled assignees, with a secondary surge in 2018–2025 reflecting diversification into CN, IN, and LU jurisdictions alongside renewed US and EP activity.
↗ Click bars to exploreKey LSP Application Domains Across Aerospace, Power, Nuclear, and Additive Manufacturing
Retrieved patent and literature records identify six primary application domains for laser shock peening, spanning gas turbine engine components, steam turbine blades, nuclear reactor stress corrosion mitigation, aircraft structural crack retardation, medical device fatigue resistance, and additive manufacturing post-processing.
Aerospace Gas Turbine Components
The largest single application domain in this dataset, LSP is applied to compressor and turbine blades in titanium alloys, nickel superalloys, and intermetallics, delivering fatigue life improvements of 2–17×. Key patents include Bharat Heavy Electricals Limited’s 2024 IN filing for gas turbine bucket roots and Jiangsu University’s 2021 US patent for double-sided synchronous LSP of turbine blade leading edges. Literature from 2022 documents residual stress and fatigue performance improvements in laser metal deposited TC17 alloy.
AerospaceNuclear Reactor Stress Corrosion Mitigation
Laser peening without coating (LPwC) was developed specifically for operating nuclear power reactors, where radioactivity and underwater conditions preclude contact-based treatments. The 532 nm water-penetrable wavelength enables fully remote fiber-delivered treatment of susceptible weld heat-affected zones in Alloy 600 and austenitic stainless steels. A 2020 literature review documents a quarter century of LPwC development for nuclear applications, and a 2023 paper characterizes residual stress profiles for laser-peened Alloy 600 surfaces.
Nuclear PowerAdditive Manufacturing Post-Processing
LSP is applied as corrective post-processing for powder bed fusion components in SS304L, CM247LC, and TC17 alloys, converting inherent tensile residual stresses of as-built AM parts into compressive states. EPFL holds an active 2022 US patent integrating a dedicated LSP laser unit within the SLS/SLM machine architecture for layer-by-layer stress correction during build. A 2023 literature review confirms LSP fatigue benefits across powder bed fusion materials, with peak CRS of −1,170 MPa reported for AM stainless steel.
Additive ManufacturingAircraft Structural Crack Retardation
Airbus Defence and Space GmbH holds two active EP patents (2015 and 2021) for LSP-induced crack retardation bands in aircraft skin structures between fuselage frames. The compressive residual stress zones serve as crack stoppers, retarding through-crack propagation in fuselage skins. These represent among the few currently in-force broad structural application patents identified in this dataset, signaling sustained defensive IP coverage in civil aerospace structures.
Aerospace StructuresKey Patent Assignees in Laser Shock Peening — Dataset Snapshot
In this dataset, General Electric Company is the largest single assignee with at least 14 retrieved filings spanning US, EP, CA, MY, and GB jurisdictions from 1999 to 2008, though most are now inactive. EPFL represents the most active recent patent cluster in retrieved records with 2 filings (2021–2022) focused on in-situ AM-integrated LSP.
Top LSP Patent Assignees by Filing Count — in Retrieved Records (Dataset Snapshot)
↗ Click bars to exploreGeneral Electric Company
The largest single assignee in this dataset with at least 14 retrieved patent entries across US, EP, CA, MY, and GB jurisdictions filed between 1999 and 2008. GE established the foundational IP portfolio covering low-energy LSP, ripstop peening patterns, dual-sided simultaneous peening, explosive coatings, acoustic quality assurance, and intermetallic part treatment. The majority of these filings are now marked inactive (expired or lapsed) in this dataset, substantially opening the core process space for new entrants.
United StatesEPFL — Lausanne
Ecole Polytechnique Federale de Lausanne (EPFL) holds 2 patents — a WO filing (2021) and an active US patent (2022) — covering laser treatment systems for in-situ LSP treatment of parts during SLS/SLM additive manufacturing production cycles. This cluster represents the most innovative recent patent filing group in this dataset, integrating a dedicated LSP laser unit within the powder bed fusion machine architecture to enable layer-by-layer compressive stress correction. The US patent is currently active.
Switzerland — CHFive Signals Shaping the Future of Laser Shock Peening (2021–2025)
Among the most recent filings and publications in this dataset (2021–2025), five directions signal where the LSP field is moving: AM-integrated in-situ peening, AI-driven process optimization, ultrafast pulse regimes, MRO life extension, and expanded material scope beyond titanium and aluminum alloys.
In-Situ AM-Integrated LSP Eliminates Post-Process Step
EPFL’s active US patent (2022) integrates a dedicated LSP laser unit within the powder bed fusion machine architecture, enabling layer-by-layer compressive stress correction during the SLS/SLM build cycle. This resolves the fundamental AM challenge of tensile residual stress accumulation without requiring a separate post-process step. A companion WO patent was filed in 2021, and a 2023 literature review confirms fatigue benefits of LSP across powder bed fusion materials.
Machine Learning and Bayesian Neural Networks Optimize LSP Process Parameters
A 2021 literature study established Bayesian neural networks for forward prediction and reverse-optimization of LSP process parameters, reducing reliance on expensive experimental campaigns. A 2025 pending CN patent from Northwestern Polytechnical University extends this to AI-driven residual stress field prediction for low-energy LSP of compressor blades. These approaches enable digital-twin integration and signal that future process IP will increasingly reside in software and model architectures.
Conventional Nanosecond LSP vs. Laser Peening Without Coating (LPwC)
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| Dimension | Conventional Nanosecond LSP | Laser Peening Without Coating (LPwC) |
|---|---|---|
| Pulse Energy | 3–50 J (high-energy Nd:YAG) | <300 mJ (low pulse energy) |
| Wavelength | 1064 nm or 532 nm | 532 nm (water-penetrable second harmonic) |
| Ablative Coating | Required (black paint, Al foil, steel foil) | Not required — coating-free operation |
| Confinement Medium | Water curtain (contact or flowing) | Water (remote, submerged delivery possible) |
| CRS Depth | 1–2 mm in Ti and Al alloys | Comparable, dependent on overlap and pulse count |
| Primary Application | Aerospace turbine blades, fuselage, AM post-processing | Nuclear reactor weld heat-affected zones, submerged components |
| Key Advantage | High peak pressure, deep CRS penetration, broad material coverage | Remote delivery, no surface preparation, underwater operation |
| IP Status in Dataset | Foundational GE portfolio largely inactive; new filings active in AM and aerospace niches | Limited active patents; VIT University IN 2017 active; quarter-century practice history |
Frequently Asked Questions: Laser Shock Peening Residual Stress Technology
Laser shock peening induces compressive residual stresses extending well beyond 1 mm in depth — significantly deeper than conventional shot peening or ultrasonic impact peening. Typical affected depths are 0.5–1.5 mm in aluminum and titanium alloys, and peak CRS values range from −200 MPa for ceramics to −1,170 MPa for additively manufactured stainless steel post-processed by LSP, based on retrieved literature.
LPwC eliminates the sacrificial ablative layer by using lower pulse energies (less than 300 mJ) and operating at the 532 nm second-harmonic wavelength, which penetrates water. This enables fully remote fiber-delivered treatment of submerged nuclear reactor components — specifically weld heat-affected zones in Alloy 600 and austenitic stainless steels — where radioactivity and underwater conditions preclude contact-based surface treatments. A 2020 literature review documents a quarter century of LPwC development for this application.
In this dataset, General Electric Company is the largest single assignee with at least 14 distinct retrieved patent entries spanning US, EP, CA, MY, and GB jurisdictions, filed between 1999 and 2008. These cover low-energy LSP, ripstop peening patterns, dual-sided simultaneous peening, explosive coatings, acoustic quality assurance, and intermetallic part treatment. The majority of these filings are now marked inactive.
EPFL holds an active US patent (2022) and a WO patent (2021) for in-situ LSP treatment during selective laser sintering or melting (SLS/SLM) build cycles. A dedicated LSP laser unit is integrated within the powder bed fusion machine architecture, enabling layer-by-layer conversion of tensile residual stresses — inherent to as-built AM parts — into compressive states, reducing distortion and crack density without a separate post-process step. LSP post-processing of SS304L, CM247LC, and TC17 alloys is also documented in 2022–2023 literature.
A 2021 literature study established Bayesian neural networks for both forward prediction of residual stress outcomes and reverse-optimization of process parameters, reducing the need for costly experimental campaigns. A 2025 pending CN patent from Northwestern Polytechnical University extends this approach to AI-driven residual stress field prediction for low-energy LSP applied to compressor blades. These approaches signal that future process IP may increasingly reside in software, training data, and model architectures rather than hardware configurations.
Based on retrieved records in this dataset, the majority of General Electric’s foundational LSP patent portfolio filed between 1999 and 2008 is now inactive (expired or lapsed) across all major jurisdictions including US, EP, CA, and GB. This substantially reduces IP barriers for practicing standard coated nanosecond LSP. Active in-force patents identified in this dataset are application-specific: Airbus Defence and Space GmbH (EP, aircraft crack retardation), EPFL (US/WO, in-situ AM-integrated LSP), VIT University (IN, warm LPwC), and Centrum Vyzkumu Rez S.R.O. (LU, pitting repair method).
Data and insights on this page are based on a limited patent and literature dataset and are for reference only. Figures may not represent the complete technology landscape.