A CAD Tool for Virtual Laser Shock Peening of Rotorcraft Components

Award Information
Agency: Department of Defense
Branch: Army
Contract: W911W6-06-C-0016
Agency Tracking Number: A052-063-1947
Amount: $69,999.00
Phase: Phase I
Program: SBIR
Awards Year: 2005
Solitcitation Year: 2005
Solitcitation Topic Code: A05-063
Solitcitation Number: 2005.2
Small Business Information
ADVANCED STRUCTURAL TECHNOLOGY, INC.
455 N. Jackson Ave., University City, MO, 63130
Duns: 085252240
Hubzone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: Y
Principal Investigator
 William Fujimoto
 President
 (203) 878-8327
 wfujimoto@advancedstructuraltechnol
Business Contact
 William Fujimoto
Title: President
Phone: (203) 878-8327
Email: wfujimoto@advancedstructuraltechnol
Research Institution
N/A
Abstract
The objective of this project is to develop a test-validated CAD tool for performing virtual laser shock peening(LSP) simulations of rotorcraft components. Virtual LSP peening can be used, in conjunction with virtual fatigue testing, to conduct simulations to assess the effects of variations in process parameters, i.e., laser beam power density and size, number of layers, and the overlay pattern, on the durability and damage tolerance of components such as gears and shafts. The foundation for the virtual LSP is a hybrid empirical/analytical process model of laser peening which allows the residual stress and plastic strain distributions throughout a member to be predicted from the process parameters and from the beam overlay pattern. The hybrid empirical/analytical process model combines parametric test data, along with the elastic strain solution for a half-space subjected to blast pressure loading, to synthesize, via the method of strain invariance, an approximate elastoplastic solution to the equations governing the propagation into the material of a shock wave formed by the laser pulse. The process model is computationally efficient, and allows estimates of the residual stress distribution, the part distortion due to the plastic strains, and the crack nucleation and crack growth lives to be obtained by straightforward CAD modeling operations. The CAD tool will also have, in addition to the virtual LSP simulation capability, a virtual shot peening capability, so that hybrid peening schemes involving LSP peening followed by a final layer of LSP peening can be evaluated. The feasibility of using such a tool to shorten the manufacturing process development time for a laser peened gear will be demonstrated and validated via testing in Phase II.

* information listed above is at the time of submission.

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