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Methodologies for Cost-Effective Measurement of Dynamic Material Properties or Characterization of Materials under Dynamic Loads

Award Information
Agency: Department of Defense
Branch: Missile Defense Agency
Contract: HQ0147-18-C-7327
Agency Tracking Number: B2-2634
Amount: $1,947,399.00
Phase: Phase II
Program: STTR
Solicitation Topic Code: MDA16-T003
Solicitation Number: 16.C
Solicitation Year: 2016
Award Year: 2018
Award Start Date (Proposal Award Date): 2018-04-03
Award End Date (Contract End Date): 2020-04-02
Small Business Information
PO Box 781607
San Antonio, TX 78278
United States
DUNS: 618026491
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 David Stevens
 Managing Principal
 (512) 380-1988
Business Contact
 David J. Stevens
Phone: (512) 380-1988
Research Institution
 Southwest Research Institute
 Sidney Chocron Sidney Chocron
6220 Culebra Road
San Antonio, TX 78238
United States

 (210) 522-3698
 Nonprofit College or University

Explosions and high-velocity impacts can create strain rates on the order of 105 to 107 s-1. To simulate these events, first-principles codes require material models that are valid at these loading rates. Currently, the amount of test data, material models and material constants for this strain rate range is extremely limited, and an innovative and cost-effective laboratory test procedure is needed. To address this need, Protection Engineering Consultants (PEC) teamed with Southwest Research Institute (SwRI) to develop a novel high-rate loading procedure that employs lasers to generate short duration shock waves within solid materials. This approach was used to measure the shock velocity, particle velocity, Hugoniot Elastic Limit (HEL), and strain rate, at rates exceeding 107 s-1 in aluminum. Multiple tests were performed in an hour, using the same sample and test setup; the cost savings compared to traditional ballistics-type testing are huge. PEC developed signal processing and data analysis techniques to identify the material properties and then to evaluate constitutive models and material constants in first principle codes. In Phase II, a number of improvements will be made to the system, including a more powerful laser, additional PDV instrumentation, and automated signal processing followed by material constant determination. Approved for Public Release | 18-MDA-9522 (23 Feb 18)

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