Dynamic deformation of hot temperature degraded POM and PP using a modified SHPB with pulse shaper technique |
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Authors: | Ouk Sub Lee Dong Hyeok Kim Yong Hwan Han Yeon Chang Park |
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Affiliation: | (1) School of Mechanical Engineering, InHa Univ., Incheon, Korea, 402-751;(2) Department of Mechanical Engineering, InHa Univ., Incheon, Korea, 402-751 |
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Abstract: | The conventional split Hopkinson pressure bar (C-SHPB) technique with a special experimental apparatus is used to obtain a
dynamic deformation material behavior under a high strain rate loading condition. An experimental modification is introduced
to reduce the non-equilibrium on the dynamic material response during a short test period for two polymeric materials. The
proposed method uses aluminum pressure bars 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) to obtain more distinguishable
experimental signals. In addition, a pulse shaper technique is used for increasing the rise time of the incident pulse to
ensure the dynamic stress equilibrium and the homogeneous deformation in the specimen under dynamic compression loading condition.
The details on the dynamic stress equilibrium and the duration of uniform strain rate during the dynamic deformation of the
specimen are experimentally investigated. The effects of degradation at a few different hot temperatures on the maximum compressive
stresses are also experimentally studied under varying impulsive loading conditions. |
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Keywords: | C-SHPB (Conventional split hopkinson pressure bar) Dynamic deformation High strain rate Pulse shaper Polymeric materials Hot temperature degraded POM (Poly oxy methylene) PP (Poly propylene) |
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