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A NOVEL PRE-COMPRESSION KOLSKY TENSION BAR TECHNIQUE FOR BRITTLE MATERIALS

Award Information
Agency: Department of Defense
Branch: Army
Contract: W912HZ-22-P-0121
Agency Tracking Number: A22B-T022-0045
Amount: $179,425.00
Phase: Phase I
Program: STTR
Solicitation Topic Code: A22B-T022
Solicitation Number: 22.B
Timeline
Solicitation Year: 2022
Award Year: 2022
Award Start Date (Proposal Award Date): 2022-09-07
Award End Date (Contract End Date): 2023-03-07
Small Business Information
7047 Old Madison Pike, Suite 305
Huntsville, AL 35806-2197
United States
DUNS: 968887195
HUBZone Owned: No
Woman Owned: Yes
Socially and Economically Disadvantaged: No
Principal Investigator
 Francisco Valentin
 (787) 538-5977
 francisco.valentin@nou-systems.com
Business Contact
 Heather Johns
Phone: (256) 327-9012
Email: heather.johns@nou-systems.com
Research Institution
 Sandia National Laboratories
 Bo Song
 
P.O.BOX 5800
Albuquerue, NM 87185-1079
United States

 (505) 844-4285
 Federally Funded R&D Center (FFRDC)
Abstract

Brittle materials such as concrete are used ubiquitously in structural engineering due to their ability to withstand enormous compressive loads. When these materials undergo a high speed impact, however, the reflection of the resultant stress wave can cause moments of tensile stress. Currently, little reliable data is available about brittle materials' tensile stress and strain information at high strain rates. This is due to the low tensile strength causing fracture before dynamic stress equilibrium can be established across the sample. nou Systems, Sandia National Labs, and Auburn University have joined together to provide a solution for this challenge by applying a pre-compressive load to Kolsky bar tensile test samples through utilizing the thermal expansion of the materials composing the Kolsky bar itself. This pre-compressive load will place the sample in a state of compression, or “negative strain”, that will enable the device to undergo a longer period of "positive" constant strain rate before sample fracture. The strategy of utilizing Kolsky bar materials will allow for existing Kolsky tension bars to be retrofitted with a the capability of applying a pre-compressive stress with very little modification to existing setups. In Phase I of this STTR, we will complete the component design, analyses, and testing needed to finalize critical details for prototype assembly, characterization, and delivery in Phase II.

* Information listed above is at the time of submission. *

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