Low Velocity and High Strain Rate Impact of Pin Reinforced Foam Core Sandwich Composites

2019 ◽  
pp. 721-729 ◽  
Author(s):  
U. K. Vaidya ◽  
P. Kumar ◽  
M. V. Hosur ◽  
M. V. Kamath ◽  
H. Mahfuz ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Foam Core ◽  
Sandwich Composites ◽  
Low Velocity

An innovative technique for measuring the high strain rate response of sandwich composites

2000 ◽  
Vol 50 (3) ◽  
pp. 279-285 ◽  
Author(s):  
Hassan Mahfuz ◽  
Wahid Al Mamun ◽  
Anwarul Haque ◽  
Sherida Turner ◽  
Hisham Mohamed ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Sandwich Composites ◽  
Innovative Technique

Dynamic Characterization of Multi-Functional Sandwich Composites

2000 ◽  
Author(s):  
Uday K. Vaidya ◽  
Scott P. Nelson ◽  
Biju Mathew ◽  
Renee M. Rodgers ◽  
Mahesh V. Hosur
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Low Velocity ◽  
Velocity Impact ◽  
Damage Initiation ◽  
The Impact

Abstract This paper deals with an innovative integrated hollow (space) E-glass/epoxy core sandwich composite construction that possesses several multi-functional benefits in addition to the providing light-weight and bending stiffness advantages. In comparison to traditional foam and honeycomb cores, the integrated space core provides a means to route wires/rods, embed electronic assemblies, and store fuel and fire-retardant foam, among other conceivable benefits. In the current work the low velocity impact (LVI) response of innovative integrated sandwich core composites was investigated. Three thickness of integrated and functionality-embedded E-glass/epoxy sandwich cores were considered in this study — including 6mm, 9mm and 17 mm. The low-velocity impact results indicated that the hollow and functionality embedded integrated core suffered a localized damage state limited to a system of core members in the vicinity of the impact. Stacking of the core was an effective way of improving functionality and limiting the LVI damage in the sandwich plate. The functionality-embedded cores provided enhanced LVI resistance due to energy additional energy absorption mechanisms. The high strain rate (HSR) impact behavior of these sandwich constructions is also studied using a Split Hopkinson Pressure Bar (SHPB) at strain rates ranging from 163 to 653 per second. The damage initiation, progression and failure mechanisms under low velocity and high strain rate impact are investigated through optical and scanning electron microscopy.

Dynamic response of glass under low-velocity impact and high strain-rate SHPB compression loading

2016 ◽  
Vol 432 ◽  
pp. 432-439 ◽  
Author(s):  
Seyed Soheil Daryadel ◽  
P. Raju Mantena ◽  
Kiyun Kim ◽  
Damian Stoddard ◽  
A.M. Rajendran
Keyword(s):  
Dynamic Response ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
Compression Loading

Processing and high strain rate impact response of multi-functional sandwich composites

2001 ◽  
Vol 52 (3-4) ◽  
pp. 429-440 ◽  
Author(s):  
U.K Vaidya ◽  
S Nelson ◽  
B Sinn ◽  
B Mathew
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Impact Response ◽  
Sandwich Composites

High Strain Rate Response of Sandwich Composites with Nanophased Cores

2005 ◽  
Vol 12 (3-4) ◽  
pp. 193-211 ◽  
Author(s):  
Hassan Mahfuz ◽  
Mohammed F. Uddin ◽  
Vijaya K. Rangari ◽  
Mrinal C. Saha ◽  
Shaik Zainuddin ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Sandwich Composites

High Strain Rate Response of Resin Infusion Molded Sandwich Composites

1999 ◽  
Author(s):  
Hassan Mahfuz ◽  
Wahid Al Mamun ◽  
Hisham Mohamed ◽  
Uday Vaidya ◽  
Anwarul Haque ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Foam Cell ◽  
Failure Process ◽  
Rate Sensitivity ◽  
Soft Materials ◽  
Sandwich Composites ◽  
Hopkinson Pressure Bar

Abstract Foam core sandwich composites have been tested under high strain rate (HSR) loading in the thickness direction. The regular Split Hopkinson Pressure Bar (SHPB) has been modified by replacing the steel transmitter bar by a polycarbonate bar. This modification resulted in stronger signals from the transmitter bar, which would otherwise be very feeble especially when testing soft materials. New sets of mathematical formulations have been derived to account for the impedance mismatch between the incidence and transmitter bars. The modified equations are first verified with a known material and then used for sandwich composites. Three types of core with various densities have been tested under compression at strain rates ranging from quasi-static to 1000 S−1. The compressive failure stress has been observed to be directly proportional to the core density, as well as to the strain rate. The strain rate sensitivity was moderate, and the sandwich composites mostly failed by the collapse of the foam-cell. Delamination did not play a major role in the failure process. Details of the mathematical derivations and the analysis of the HSR behavior are presented in this paper.

High-strain-rate superplasticity from nanocrystalline Al alloy 1420 at low temperatures

2001 ◽  
Vol 81 (1) ◽  
pp. 37-48 ◽  
Author(s):  
R. S. Mishra, R. Z. Valiev, S. X. McFa
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Low Temperatures ◽  
High Strain ◽  
Al Alloy
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