David F Lahrman

US Patent:

6412331, Jul 2, 2002

Filed:

Nov 19, 1999

Appl. No.:

09/443811

Inventors:

Allan H. Clauer - Worthington OH
Craig T. Walters - Powell OH
David F. Lahrman - Powell OH

Assignee:

LSP Technologies, Inc. - Dublin OH

International Classification:

G01L 500

US Classification:

73 1102

Abstract:

An apparatus for measuring the strength of a pressure pulse created from a laser peening device. The apparatus is reusable, and includes a pressure-sensitive medium, a back-up disk, and a cap, all disposed within a housing having a removable lid. All components of the apparatus are replaceable, thereby allowing an operator to utilize the apparatus more than once despite the harsh environment of laser peening.

US Patent:

6462308, Oct 8, 2002

Filed:

Nov 23, 1999

Appl. No.:

09/448683

Inventors:

David F. Lahrman - Powell OH
Allan H. Clauer - Worthington OH

Assignee:

LSP Technologies, Inc. - Dublin OH

International Classification:

B23K 2600

US Classification:

21912185, 21912183

Abstract:

An apparatus and method of utilizing natural frequency shifts of a laser shock processed workpiece to determine if sufficient laser shock processing has been accomplished.

US Patent:

6483578, Nov 19, 2002

Filed:

Jun 12, 2000

Appl. No.:

09/592534

Inventors:

Allan H. Clauer - Worthington OH
Steven M. Toller - Dublin OH
Jeff L. Dulaney - Dublin OH
David F. Lahrman - Powell OH

Assignee:

LSP Technologies, Inc. - Dublin OH

International Classification:

G01J 100

US Classification:

356213, 148508

Abstract:

A method and apparatus for measuring the quality of a laser peening process, which includes a test element, a mount for the test element, wherein the test element is mounted at a preselected point in the anticipated path of a laser pulse, the laser pulse irradiates the test element, the deflection of the test element is measured in the direction substantially perpendicular and away from the impacted surface of the test element, and the deflection measurement is compared to a previously generated chart showing the relationship between characteristics of test elements and desired material properties.

US Patent:

6539773, Apr 1, 2003

Filed:

Jun 18, 2001

Appl. No.:

09/883712

Inventors:

Allan H. Clauer - Worthington OH
Craig T. Walters - Powell OH
David F. Lahrman - Powell OH

Assignee:

LSP Technologies, Inc. - Dublin OH

International Classification:

G01L 500

US Classification:

73 1102, 73 1209

Abstract:

An apparatus for measuring the strength of a pressure pulse created from a laser peening device. The apparatus is reusable, and includes a pressure-sensitive medium, a back-up disk, and a cap, all disposed within a housing having a removable lid. All components of the apparatus are replaceable, thereby allowing an operator to utilize the apparatus more than once despite the harsh environment of laser peening.

US Patent:

6548782, Apr 15, 2003

Filed:

Jan 23, 2001

Appl. No.:

09/767528

Inventors:

Steven E. Dykes - Powell OH
Allan H. Clauer - Worthington OH
Jeff L. Dulaney - Dublin OH
David F. Lahrman - Powell OH
Mark OLoughlin - Galloway OH

Assignee:

LSP Technologies, Inc. - Dublin OH

International Classification:

B23K 2600

US Classification:

21912185

Abstract:

A method of controlling the application of laser peening overlays on the surface of a workpiece to reduce the variability of shock waves generated therein, comprises applying an energy-absorbing overlay to a portion of the surface of a workpiece, measuring the thickness of the energy-absorbing overlay in at least one location on the energy-absorbing overlay, applying a transparent overlay material over the energy-absorbing overlay, measuring the thickness of the transparent overlay in at least one location on the transparent overlay, determining if the measured values for each overlay is within a specified range, and directing a pulse of coherent energy to the workpiece to create a shock wave therein when the measured values are within the specified range.

US Patent:

6664506, Dec 16, 2003

Filed:

Jul 29, 2002

Appl. No.:

10/207560

Inventors:

Allan H. Clauer - Worthington OH
David F. Lahrman - Powell OH
Jeff L. Dulaney - Dublin OH
Steve M. Toller - Dublin OH

Assignee:

LSP Technologies, Inc. - Dublin OH

International Classification:

B23K 2600

US Classification:

21912185

Abstract:

Various laser shock processing methods are provided to establish selective compressive residual stress distribution profiles within a workpiece. An asymmetrical stress distribution profile may be formed through the thickness of a thin section of a gas turbine engine airfoil. One method involves simultaneously irradiating a workpiece with a set of laser beams to form a corresponding set of adjacent non-overlapping laser shock peened surfaces, enabling the shockwaves to encounter one another. Additionally, opposite sides of the workpiece may be irradiated at different times to form opposing laser shock peened surfaces, enabling the shockwaves to meet at a location apart from the midplane. Furthermore, opposite sides of the workpiece may be irradiated simultaneously using laser beams having different pulse lengths to form opposing laser shock peened surfaces. Moreover, opposite sides of the workpiece may be irradiated simultaneously to form a set of laterally offset laser shock peened surfaces.

US Patent:

6752593, Jun 22, 2004

Filed:

Jul 29, 2002

Appl. No.:

10/207622

Inventors:

Allan H. Clauer - Worthington OH
David F. Lahrman - Powell OH
Jeff L. Dulaney - Dublin OH
Steve M. Toller - Dublin OH

Assignee:

LSP Technologies, Inc. - Dublin OH

International Classification:

F01D 514

US Classification:

415200, 416241 R, 21912185, 21912176

Abstract:

Articles produced by laser shock processing exhibit various compressive residual stress distribution profiles. A gas turbine engine airfoil includes an asymmetrical stress profile formed through the thickness of its thin section. The articles include plural laser shock peened surfaces and plural regions having deep compressive residual stresses imparted by laser shock peening extending into the article from the laser peened surfaces. One article includes at least one set of simultaneously formed, adjacent non-overlapping laser shock peened surfaces. Another article includes at least one set of opposing laser shock peened surfaces formed at different times at opposite sides of the article. Another article includes at least one set of opposing laser shock peened surfaces formed simultaneously at opposite sides of the article using laser beams having different pulse lengths. Another article includes at least one set of laterally offset laser shock peened surfaces simultaneously formed at opposite sides of the article.

US Patent:

6759626, Jul 6, 2004

Filed:

Jul 29, 2002

Appl. No.:

10/207527

Inventors:

Allan H. Clauer - Worthington OH
David F. Lahrman - Powell OH
Jeff L. Dulaney - Dublin OH
Steve M. Toller - Dublin OH

Assignee:

LP Technologies, Inc. - Dublin OH

International Classification:

B23K 2600

US Classification:

2191216, 21912181, 21912182

Abstract:

Various laser shock processing systems are provided to establish selective compressive residual stress distribution profiles within a workpiece. An asymmetrical stress profile may be formed through the thickness of a thin section of a gas turbine engine airfoil. One system is configured to simultaneously irradiate a workpiece with a set of laser beams to form a corresponding set of adjacent non-overlapping laser shock peened surfaces, enabling the shockwaves to encounter one another. Another system irradiates opposite sides of the workpiece at different times to form opposing laser shock peened surfaces, enabling the shockwaves to meet at a location apart from the mid-plane. Another system simultaneously irradiates opposite sides of the workpiece using laser beams having different pulse lengths to form opposing laser shock peened surfaces. Another system simultaneously irradiates opposite sides of the workpiece to form a set of laterally offset laser shock peened surfaces.