American Society of Civil Engineers


ES2012 Ballistic Impact and Parameters Sensitivity of Ceramic Aerospace Materials at Room Temperatures


by F. Abdi, (AlphaStar Corporation, 5150 E. Pacific Coast Hwy # 650 Long Beach, CA 90804, USA), C. Godines, (AlphaStar Corporation, 5150 E. Pacific Coast Hwy # 650 Long Beach, CA 90804, USA), W. Troha, (AlphaStar Corporation, 5150 E. Pacific Coast Hwy # 650 Long Beach, CA 90804, USA), G. Morscher, (University of Akron, Akron, OH 44325), and Sung Choi, (NAVAIR, Buse Road, Patuxent River, 20670 USA)
Section: Symposium 6: Ballistic Impact and Crashworthiness Response of Aerospace Structures, pp. 1227-1243, (doi:  http://dx.doi.org/10.1061/9780784412190.134)

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Document type: Conference Proceeding Paper
Part of: Earth and Space 2012: Engineering, Science, Construction, and Operations in Challenging Environments
Abstract: Ceramic matrix composites in advanced gas-turbine engines must have predictable toughness under impact from foreign objects. A damage evolution based multi-scale progressive failure analysis (MS-PFA) was performed using in-situ fiber/matrix/interphase properties. The MS-PFA code augments commercial explicit FE codes for impact and implicit code for post impact analysis including the effect of impact residual stress and damage. The physics coupling the micro and macro scale boundaries are used by MS-PFA. The root cause of translaminar damage advancement (delamination between fiber and matrix, fiber-breakage/micro-crack density and matrix residual stiffness) at the micromechanical level is used to: a) to understand the damage tolerance of structures; b) produce probabilistic sensitivities of contributing parameters (i.e., strain rate, interphase, fiber and matrix properties) to damage size foot print. Steel projectiles (diameter=1.59mm) were used to impact a SiC/SiC: 2D 5 Harnes Satin Woven Sylramic iBN MI SiC at speeds from 100-400m/s (Mach:0.3-1.2). Literature data of impact tests were simulated in this work from various sources. The paper will discuss the foreign object damage (FOD) test and simulation comparisons for variables such as energy vs. time, damage foot print, % damage volume vs. time.


ASCE Subject Headings:
Parameters
Material properties
Temperature effects
Engines
Turbines