Estimation of reliability and dynamic property for polymeric material at high strain rate using SHPB technique and probability theory

Dong Hyeok Kim; Ouk Sub Lee; Hong Min Kim; Hye Bin Choi

doi:10.1117/12.839067

24 August 2009 Estimation of reliability and dynamic property for polymeric material at high strain rate using SHPB technique and probability theory

Dong Hyeok Kim, Ouk Sub Lee, Hong Min Kim, Hye Bin Choi

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Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73751N (2009) https://doi.org/10.1117/12.839067
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

A modified Split Hopkinson Pressure Bar technique with aluminum pressure bars and a pulse shaper technique to achieve a closer impedance match between the pressure bars and the specimen materials such as hot temperature degraded POM (Poly Oxy Methylene) and PP (Poly Propylene). The more distinguishable experimental signals were obtained to evaluate the more accurate dynamic deformation behavior of materials under a high strain rate loading condition. A pulse shaping technique is introduced to reduce the non-equilibrium on the dynamic material response by modulation of the incident wave during a short period of test. This increases the rise time of the incident pulse in the SHPB experiment. For the dynamic stress strain curve obtained from SHPB experiment, the Johnson-Cook model is applied as a constitutive equation. The applicability of this constitutive equation is verified by using the probabilistic reliability estimation method. Two reliability methodologies such as the FORM and the SORM have been proposed. The limit state function(LSF) includes the Johnson-Cook model and applied stresses. The LSF in this study allows more statistical flexibility on the yield stress than a paper published before. It is found that the failure probability estimated by using the SORM is more reliable than those of the FORM/ It is also noted that the failure probability increases with increase of the applied stress. Moreover, it is also found that the parameters of Johnson-Cook model such as A and n, and the applied stress are found to affect the failure probability more severely than the other random variables according to the sensitivity analysis.

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Dong Hyeok Kim, Ouk Sub Lee, Hong Min Kim, and Hye Bin Choi "Estimation of reliability and dynamic property for polymeric material at high strain rate using SHPB technique and probability theory", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73751N (24 August 2009); https://doi.org/10.1117/12.839067

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KEYWORDS

Failure analysis

Reliability

Aluminum

Polymers

Probability theory

Safety

Wave propagation

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