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High Temperature Fracture Mechanics

Award Information
Agency: Department of Defense
Branch: Missile Defense Agency
Contract: HQ0860-20-C-7060
Agency Tracking Number: B19C-002-0022
Amount: $125,000.00
Phase: Phase I
Program: STTR
Solicitation Topic Code: MDA19-T002
Solicitation Number: 19.C
Solicitation Year: 2019
Award Year: 2020
Award Start Date (Proposal Award Date): 2020-06-22
Award End Date (Contract End Date): 2021-10-15
Small Business Information
2901 Benvenue Ave.
Berkeley, CA 94705
United States
DUNS: 102090847
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Shmuel L Weissman
 President & CEO
 (510) 528-1251
Business Contact
 Shmuel Weisssman
Phone: (510) 528-1251
Research Institution
 Univeristy of California Berkeley
 Greg Howell Greg Howell
Regents of the University of California, c/o Industry Alliances Offic 2150 Shattuck Ave., 10th Floor, Mail Code 1610
Berkeley, CA 94704
United States

 (510) 642-2958
 Nonprofit College or University

The objective of this project is to develop a capability to model fracture of materials used in hypersonic vehicles that results from hypervelocity impact while exposed to extreme temperatures. Symplectic Engineering’s approach addresses this challenge at two levels. At the computational level, a Relaxed Extended Finite Element approach is pursued to represent (possibly intersecting) fractures lines independent of the underlying computational mesh. This approach is integrated with strategies that facilitate the simulation of shock waves that may develop as a result of extreme pressure engendered by the hypervelocity impact. The other level addressed is that of the material models. In Phase I, Symplectic Engineering chose to consider polycrystalline materials, coated with a silica-based ceramic thermal shield. A viscoplastic model based on multiplicative decompositions of the deformation gradient (mechanical-thermal and elastic-inelastic) will be pursued for the polycrystalline material, and an elastic-brittle model will be adopted for the silica-based ceramic material. The models will be implemented and applied to simulate experiments selected from the literature that will demonstrate the feasibility of the proposed approach. Symplectic Engineering will also propose as set of tests, to be undertaken in Phase II, for the identification of material properties and model validation. Approved for Public Release | 20-MDA-10398 (2 Mar 20)

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

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