Transient response of a submerged cylindrical foam core sandwich panel subjected to shock loading

2011 ◽  
Vol 32 (5) ◽  
pp. 2611-2620 ◽  
Author(s):  
Babak Panahi ◽  
Esmaeal Ghavanloo ◽  
Farhang Daneshmand
Keyword(s):  
Transient Response ◽  
Shock Loading ◽  
Sandwich Panel ◽  
Foam Core

Transient response of structures with uncertain properties to nonlinear shock loading

2013 ◽  
Vol 332 (22) ◽  
pp. 5821-5836 ◽  
Author(s):  
Mauro Caresta ◽  
Robin S. Langley ◽  
Jim Woodhouse
Keyword(s):  
Transient Response ◽  
Shock Loading ◽  
Nonlinear Shock

Impact response of a low-cost randomly oriented fiber foam core sandwich panel

2018 ◽  
Vol 52 (25) ◽  
pp. 3429-3444 ◽  
Author(s):  
Ezequiel Buenrostro ◽  
Daniel Whisler
Keyword(s):  
Mechanical Properties ◽  
Sandwich Panel ◽  
Low Cost ◽  
Three Dimensional ◽  
Cost Effective ◽  
Foam Core ◽  
Fiber Reinforced ◽  
Manufacturing Method ◽  
Manufacturing Techniques ◽  
The Impact

Three-dimensional fiber-reinforced foam cores may have improved mechanical properties under specific strain rates and fiber volumes. But its performance as a core in a composite sandwich structure has not been fully investigated. This study explored different manufacturing techniques for the three-dimensional fiber-reinforced foam core using existing literature as a guideline to provide a proof of concept for a low-cost and easily repeatable method comprised of readily available materials. The mechanical properties of the fiber-reinforced foam were determined using a three-point bend test and compared to unreinforced polyurethane foam. The foam was then used in a sandwich panel and subjected to dynamic loading by means of a gas gun (103 s−1). High-strain impact tests validated previously published studies by showing, qualitatively and quantitatively, an 18–20% reduction in the maximum force experienced by the fiber-reinforced core and its ability to dissipate the impact force in the foam core sandwich panel. The results show potential for this cost-effective manufacturing method to produce an improved composite foam core sandwich panel for applications where high-velocity impacts are probable. This has the potential to reduce manufacturing and operating costs while improving performance.

Analytical Determination of Shock Response Spectra for an Impulse-Loaded Proportionally Damped System

Volume 1 ◽  
2004 ◽  
Author(s):  
R. David Hampton ◽  
Nathan S. Wiedenman ◽  
Ting H. Li
Keyword(s):  
Transient Response ◽  
Shock Loading ◽  
Response Spectrum ◽  
Response Spectra ◽  
Analytical Determination ◽  
System Response ◽  
Mechanical Shock ◽  
Shock Response ◽  
Mass Spring ◽  
The Impact

Many military systems must be capable of sustained operation in the face of mechanical shocks due to projectile or other impacts. The most widely used method of quantifying a system’s vibratory transient response to shock loading is called the shock response spectrum (SRS). The system response for which the SRS is to be determined can be due, physically, either to a collocated or to a noncollocated shock loading. Taking into account both possibilities, one can define the SRS as follows: the SRS presents graphically the maximum transient response (output) of an imaginary ideal mass-spring-damper system at one point on a flexible structure, to a particular mechanical shock (input) applied to an arbitrary (perhaps noncollocated) point on the structure, as a function of the natural frequency of the imaginary mass-spring-damper system. For a response point sufficiently distant from the impact area, many Army platforms (such as vehicles) can be accurately treated as linear systems with proportional damping. In such cases the output due to an impulsive mechanical-shock input can be decomposed into exponentially decaying sinusoidal components, using normal-mode orthogonalization. Given a shock-induced loading comprising such components, this paper provides analytical expressions for the various common SRS forms. The analytical approach to SRS-determination can serve as a verification of, or an alternative to, the numerical approaches in current use for such systems. No numerical convolution is required, because the convolution integrals have already been accomplished analytically (and exactly), with the results incorporated into the algebraic expressions for the respective SRS forms.

Shock loading response of sandwich panels with 3-D woven E-glass composite skins and stitched foam core

2009 ◽  
Vol 69 (6) ◽  
pp. 736-753 ◽  
Author(s):  
Srinivasan Arjun Tekalur ◽  
Alexander E. Bogdanovich ◽  
Arun Shukla
Keyword(s):  
Shock Loading ◽  
Sandwich Panels ◽  
Foam Core ◽  
Glass Composite ◽  
Composite Skins

scholarly journals Non-Fourier heat conduction in a sandwich panel with a cracked foam core

2016 ◽  
Vol 102 ◽  
pp. 263-273 ◽  
Author(s):  
J.W. Fu ◽  
A.H. Akbarzadeh ◽  
Z.T. Chen ◽  
L.F. Qian ◽  
D. Pasini
Keyword(s):  
Heat Conduction ◽  
Sandwich Panel ◽  
Foam Core ◽  
Fourier Heat Conduction
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