Transverse Impact Response of a Linear Elastic Ballistic Fiber Yarn

2011 ◽  
Vol 78 (5) ◽  
Author(s):  
Bo Song ◽  
Hwun Park ◽  
Wei-Yang Lu ◽  
Weinong Chen
Keyword(s):  
Longitudinal Wave ◽  
Transverse Wave ◽  
Wave Speed ◽  
Impact Response ◽  
High Speed Photography ◽  
Transverse Impact ◽  
Ballistic Performance ◽  
Linear Elastic ◽  
The Impact ◽  
Longitudinal Wave Speed

Transverse impact response of a linear elastic Kevlar® KM2 fiber yarn was determined at various striking speeds from Hopkinson bar and gas gun experiments incorporated with high-speed photography techniques. Upon transverse impact, a triangle shape was formed in the fiber yarn. Both longitudinal and transverse waves were produced and propagated outwards the fiber yarn. Both the angle of the triangle and Euler transverse wave speed vary with striking speeds. The relationship between the Euler transverse wave speed and the striking speed was determined. The transverse impact response of the fiber yarn was also analyzed with a model, which agrees well with the experimental results. The model shows that the longitudinal wave speed is critical in the ballistic performance of the fiber yarn. At a certain striking speed, a higher longitudinal wave speed produces a higher Euler transverse wave speed, enabling us to spread the load and dissipate the impact energy faster, such that the ballistic performance of the fiber yarn is improved.

Effect of Compressive Stress on Longitudinal Wave Speed in Cementitious Material

2002 ◽  
Author(s):  
Mary L. Hughes ◽  
C. Allen Ross ◽  
Voncile L. Ashley
Keyword(s):  
Constitutive Equation ◽  
Longitudinal Wave ◽  
Uniaxial Compression ◽  
Wave Speed ◽  
Constitutive Relations ◽  
Damage Parameter ◽  
Primary Objective ◽  
Compression Tests ◽  
Depth Of Penetration ◽  
Longitudinal Wave Speed

The Air Force has been interested for some time in the development of computer codes that accurately predict the penetrator trajectory created when munitions are fired into concrete and geomaterial targets, as well as the resulting depth of penetration. Recent work has focused on experimental research performed to determine quasistatic, dynamic, unconfined and confined material properties for development of an elastic/viscoplastic constitutive equation. This constitutive equation has shown some promise in predicting stress and strains but lacks a consistent damage parameter to predict damage or fractures exhibited by the target material during experimental impact tests. Current damage level predictors that employ a scalar damage parameter are not sufficient to predict the directional damage or fracture that occurs in simple uniaxial compression tests of concrete and geomaterials. Tensorial or directional damage parameters coupled with constitutive relations are necessary for better understanding and accurate prediction of damage exhibited when munitions impact concrete and geomaterials. The primary objective of the study described herein was to identify, quantify and characterize damage parameters associated with certain constitutive responses of cementitious and geologic materials. To that end, longitudinal wave speed and biaxial strain data were collected simultaneously on a series of grout cubes as they were being loaded to failure in uniaxial compression. The results of these tests, and a comparison to existing related data [1, 2] are presented.

Measurements of the longitudinal wave speed in thin materials using a wideband PVDF transducer

2003 ◽  
Vol 114 (3) ◽  
pp. 1450-1453 ◽  
Author(s):  
Kwang Yul Kim ◽  
Wei Zou ◽  
Steve Holland ◽  
Wolfgang Sachse
Keyword(s):  
Longitudinal Wave ◽  
Wave Speed ◽  
Longitudinal Wave Speed

Effect of Flexibility in Transverse Impact Problems

1997 ◽  
Author(s):  
Ahmet S. Yigit ◽  
Andreas P. Christoforou
Keyword(s):  
Multibody Systems ◽  
Computational Models ◽  
Functional Relationship ◽  
Impact Force ◽  
Impact Response ◽  
Flexible Body ◽  
Transverse Impact ◽  
Impact Problems ◽  
Maximum Impact Force ◽  
The Impact

Abstract The nature of impact response of a flexible body is studied. The key parameters which govern the nature of impact response are identified. The effects of these parameters on the impact response are examined through numerical simulations. It is shown that the normalized impact force and the type of impact response can be predicted through the functional relationship between the normalized maximum impact force and two nondimensional parameters termed as “loss factor” and “relative stiffness”. It is expected that the results of this study will be of great value in choosing adequate impact and computational models for the dynamic analysis of multibody systems subject to transverse impacts.

Reply to comment on ‘Measuring longitudinal wave speed in solids: two methods and a half’

2006 ◽  
Vol 28 (1) ◽  
pp. L3-L5
Author(s):  
C Fazio ◽  
I Guastella ◽  
R M Sperandeo-Mineo ◽  
G Tarantino
Keyword(s):  
Longitudinal Wave ◽  
Wave Speed ◽  
Longitudinal Wave Speed

scholarly journals Characterisation of the impact response of energetic materials: observation of a low-level reaction in 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105)

RSC Advances ◽  
2016 ◽  
Vol 6 (33) ◽  
pp. 27896-27900 ◽  
Author(s):  
David M. Williamson ◽  
Sue Gymer ◽  
Nicholas E. Taylor ◽  
Stephen M. Walley ◽  
Andrew P. Jardine ◽  
...  
Keyword(s):  
Optical Spectroscopy ◽  
Energetic Materials ◽  
High Speed ◽  
Impact Response ◽  
High Speed Photography ◽  
High Explosives ◽  
Time Resolved ◽  
Optical Radiometry ◽  
Integrated Diagnostics ◽  
The Impact

Time resolved and integrated diagnostics including high speed photography, mass and optical spectroscopy, and optical-radiometry used to study impact response of high explosives in far more detail than possible with conventional sensitiveness tests.

scholarly journals Measuring longitudinal wave speed in solids: two methods and a half

2006 ◽  
Vol 27 (4) ◽  
pp. 687-701 ◽  
Author(s):  
C Fazio ◽  
I Guastella ◽  
R M Sperandeo-Mineo ◽  
G Tarantino
Keyword(s):  
Longitudinal Wave ◽  
Wave Speed ◽  
Longitudinal Wave Speed

Self-Sustained Fracture Waves in Soda-Lime Glass

2010 ◽  
Vol 662 ◽  
pp. 95-104 ◽  
Author(s):  
M. Munawar Chaudhri
Keyword(s):  
Residual Stress ◽  
Longitudinal Wave ◽  
Lead Oxide ◽  
Wave Speed ◽  
Soda Lime ◽  
Oxide Glass ◽  
Soda Lime Glass ◽  
Lead Glass ◽  
Fracture Wave ◽  
Longitudinal Wave Speed

High-speed framing photography in conjunction with circularly polarised light has been employed to monitor qualitatively the state of residual stress in Prince Rupert’s drops of soda-lime glass undergoing disintegration by a self-sustained fracture wave in the glass drops. It is revealed that the fracture wave through a Prince Rupert’s drop is driven by the residual stress in the drop, with the propagation speed of the fracture wave being (1700 ± 100) ms-1, which is close to the terminal speed of individual cracks in the soda-lime glass, but is much smaller than the longitudinal wave speed of 5300 ms-1 in the glass. These observations support our recently reported observations and also give support to our conclusions that the fracture wave speed of a self-sustained fracture wave is equal to the terminal speed of individual cracks in the glass. Some preliminary observations from fracture waves in Prince Rupert’s drops of a lead oxide glass are also described, which show that in Prince Rupert’s drops of the lead oxide glass the fracture wave is also self-sustained and it travels through the drop at a steady and stable speed of (1300 ± 100) ms-1, which is also considerably smaller than the longitudinal wave speed of 4800 ms-1 in the lead glass. A brief comment is also made on the fracture waves observed by other workers in brittle oxide glasses and solids generated by plate impacts and shock waves.

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