Theoretical analysis on the local critical stress and size effect for interfacial debonding in particle reinforced rheological materials |
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Authors: | Chen Jiankang Huang Zhuping Bai Shulin Liu Yi |
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Affiliation: | (1) Department of Mechanics and Engineering Science, Peking University, 100871 Beijing, China |
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Abstract: | The mechanisms of interfacial debonding of particle reinforced rheological materials are studied. Based on an energy criterion, a simple formula of local critical stress for interfacial debonding is derived and expressed in terms of the interfacial energy. The particle size effect on interface debonding can then be analyzed easily owing to the fact that critical stress is inversely proportional to the square root of particle radius. By taking PP/CaCO3 system as an example, the present energy criterion is compared with the mechanical debonding criterion, and it is found that under the condition that bond strength is equal to matrix strength and particle radius not over 0.2μm, the mechanical debonding criterion can be automatically satisfied if the energy criterion is satisfied. A relation between critical time and interface energy is calculated by using the energy criterion. The influences of the particle volume fraction and the parlicle size, the loading rate and the relaxation time of the matrix on the critical time of interfacial debonding are also discussed. Supported by the National Natural Science Foundation of China (19632030 and 19872007) and Natural Science Foundation of Jiangsu Province. |
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Keywords: | particle reinforced rheological materials interfacial debonding energy criterion and mechanical debonding criterion size effect |
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