High strain-rate shear deformation of a polyurethane elastomer subjected to impact loading

1984 ◽  
Vol 24 (11) ◽  
pp. 851-861 ◽  
Author(s):  
Y. M. Gupta
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Shear Deformation ◽  
Impact Loading ◽  
High Strain ◽  
Polyurethane Elastomer

scholarly journals High-strain-rate mechanical response of HTPE propellant under SHPB impact loading

AIP Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 035145
Author(s):  
Heng-ning Zhang ◽  
Hai Chang ◽  
Jun-qiang Li ◽  
Xiao-jiang Li ◽  
Han Wang
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Impact Loading ◽  
Mechanical Response ◽  
High Strain

High Strain Rate Behavior of Epoxy Graphene Oxide Nanocomposites

2018 ◽  
Vol 10 (07) ◽  
pp. 1850072 ◽  
Author(s):  
Suneev Anil Bansal ◽  
Amrinder Pal Singh ◽  
Suresh Kumar
Keyword(s):  
Graphene Oxide ◽  
High Strain Rate ◽  
Strain Rate ◽  
Impact Loading ◽  
High Strain ◽  
Chemical Oxidation ◽  
Uniform Dispersion ◽  
Mixing Method ◽  
Strain Rate Loading ◽  
The Impact

The present work investigates the novel impact loading response of two-dimensional graphene oxide (GO) reinforced epoxy nanocomposites at high strain rate. The testing was performed up to 1000[Formula: see text]s[Formula: see text] of high strain rate, where maximum damage occurs during the impact loading conditions. The Split Hopkinson Pressure Bar (SHPB) was used for the impact loading of the composite specimen. The nanofiller material GO was synthesized by chemical oxidation of graphite flakes used as the precurser. Synthesized GO was characterized using FTIR, UV-visible, XRD, Raman Spectroscopy and FE-SEM. Solution mixing method was used to fabricate the nanocomposite samples having uniform dispersion of GO as confirmed from the SEM images. Strain gauges mounted on the SHPB showed regular signal of transmitted wave during high strain rate testing on SHPB, confirming the regular dispersion of both the phases. Results of the transmission signal showed that the solution mixing method was effective in the synthesis of almost defect-free nanocomposite samples. The strength of the nanocomposite improved significantly using 0.5[Formula: see text]wt.% reinforcement of GO in the epoxy matrix at high strain rate loading. The epoxy GO nanocomposite showed a 41% improvement in maximum stress at 815[Formula: see text]s[Formula: see text] strain rate loading.

scholarly journals Crash Response of Laser-Welded Energy Absorbers Made of Docol 1000DP and Docol 1200M Steels

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2808
Author(s):  
Paweł Prochenka ◽  
Jacek Janiszewski ◽  
Michał Kucewicz
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Welded Joints ◽  
Impact Loading ◽  
High Strain ◽  
Mechanical Energy ◽  
Base Material ◽  
Strain Rates ◽  
Loading Conditions ◽  
Steel Grades

The crushing response of a laser-welded square tube absorber made of two commercial steel grades, Docol 1000DP and Docol 1200M, is presented in the paper. Crush experiments are performed at two different loading conditions, namely, quasi-static loading at 0.5 mm/s deformation speed and impact loading at 25–28 m/s. A new approach has been proposed to study the square tube absorber under impact loading using a direct impact Hopkinson (DIH) method. To characterize the mechanical properties of the tested steels, tensile quasi-static and high strain rate testing are also performed with the use of specimens with a 7 mm gauge length. The applied strain rates are 10−3, 100, and above 103 s−1. The laser-welded joints are also characterized by microhardness test involving the base material, heat-affected zone, and fusion zone. The crashworthiness of model square tube absorbers is estimated based on the following parameters: absorbed energy, mean force, crushing force efficiency factor, and specific energy absorbed. It has been found that the square tube absorbers made of Docol 1200M steel show a higher potential in mechanical energy absorption capacity than Docol 1000DP absorber. Moreover, crushing tests prove that laser-welded joints in 0.6 mm sheets made of Docol 1000DP and Docol 1200M steels reveal high cracking toughness. In turn, strength testing at different strain rates confirms the higher strain rate sensitivity of Docol 1000DP steel than in the case of Docol 1200M steel as well as an increase in the high ductility properties of both steel grades under the high strain rate loading conditions.

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