Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 68, Issue -, Pages 356-364Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2014.10.018
Keywords
Metal matrix composites (MMCs); Microstructures; Stress transfer; Analytical modeling
Funding
- Chinese Ministry of Education [211061]
- National Natural Science Foundation of China [10502025, 10872087, 11272143]
- Program for Chinese New Century Excellent Talents in University [NCET-12-0712]
- Ph.D. Programs Foundation of Ministry of Education of China [20133221110008]
- Research Innovation Program for College Graduates of Jiangsu Province [CXZZ13-0434]
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The matrix grain size plays a dual role in metal matrix composites (MMCs). Contrary to enhance the strength of matrix, grain refinement can weaken the thermal expansion mismatch strengthening induced by the reinforcement. In this article, a dislocation density based model is developed to describe the factors affecting the strengthening mechanisms in Carbon nanotube (CNT)-reinforced MMCs with different matrix grain sizes. Two kinds of thermal expansion mismatch strengthening mechanisms are considered, i.e., geometrically necessary dislocations (GNDs) are distributed in entire matrix and GNDs are limited in dislocation punched zones (DPZs). In addition, comparisons between the predictions and some available experimental results are also performed. (C) 2014 Elsevier Ltd. All rights reserved.
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