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摘要:
The influencing factors of the performances of an impact buffering made of the composite granular chain of spheres were investigated by both the finite element analysis and experiments. The composite granular chain was prepared by inserting an adjustable chain into a one-dimensional steel granular chain of spheres. It is suggested to select the key influencing factor as lambda = (E-v/E-s(2/3)rho(v)/rho(s), which determined the features of output impulses. The amplitude ratios of primary and secondary output impulses to the incident impulse of highly nonlinear solitary wave (HNSW) and the time delay between the primary and secondary output impulses demonstrated the two-stage dependencies on the parameter of lambda. The two stages were separated from each other by the case of lambda = = 1. It was suggested to construct an impact buffering with near-zero lambda in order to minimize the amplitude of primary output impulse. The amplitude attenuation of the primary output impulse in the adjustable chain followed the power law and the power exponent was negatively correlated with the value of lambda. As for a composite chain with a given parameter of lambda, through increasing the length of the adjustable chain, the amplitude of the primary output impulse could be decreased in order to improve the performance of impact buffering.
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来源 :
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
ISSN: 0734-743X
年份: 2020
卷: 137
5 . 1 0 0
JCR@2022
ESI学科: ENGINEERING;
ESI高被引阀值:115