Mechanical Responses of PBDMS-silica under Impact Loading

doi:10.3969/j.issn.1000-1093.2018.01.015

Abstract

Abstract: The impact testing, quasi-static and dynamic compressions and finite element simulation were performed to investigate the impact-resistant properties and rate-dependence mechanism of an impact-hardening polymer composite (PBDMS-silica). PBDMS-silica shows liquid-to-solid transition under impact loading, and such impact-resistant behavior is volume fraction-dependent and rate-dependent. This is confirmed by over 10⁴ times increase in compressive and shear strength in the range from quasi-static to dynamic loading. Finite element method (FEM) shows a compression-shear-coupled stress state in PBDMS-silica during impact loading, and the shear stress plays an increasingly important role in impact resistance. Jamming transition is captured during the deformation of the impact-hardening polymer by high-speed imaging with digital image correlation (DIC) technique. Combined with the mechanical responses, the conclusions are made that jamming transition induced by dynamic compression is the source of impact-resistant behavior, and the dynamic shear during impact determines how such behavior is rate-dependent. This provides a solution for the improvement of impact resistance by strengthening the dynamic shear response of the material. Key

Key words: impact-hardeningpolymercomposite, impact-resistantproperty, dynamicmechanicalresponse, strain-ratesensitivity, jammingtransition

CLC Number:

O347.3

ZHOU Ding, MIAO Ying-gang, WANG Yan-pei, LI Feng, LI Yu-long. Mechanical Responses of PBDMS-silica under Impact Loading[J]. Acta Armamentarii, 2018, 39(1): 137-145.

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第39卷
第1期2018 年1月兵工学报ACTA
ARMAMENTARIIVol.39No.1Jan.2018

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