scholarly journals Some Observations About the Drop-weight Explosive Sensitivity Test

2020 ◽  
Author(s):  
P. J. Rae ◽  
P. M. Dickson
Keyword(s):  
Screening Test ◽  
Sensitivity Test ◽  
Sensitivity Testing ◽  
Drop Weight ◽  
Weight Test ◽  
Explosive Properties ◽  
Drop Weight Test ◽  
Explosive Sensitivity

Abstract The apparent simplicity of the drop-weight apparatus for explosive sensitivity testing hides the reality that it is actually a complex integrated test of both ignition and growth of deflagration. Although the drop-weight test is undeniably a useful screening test for explosive properties, a misunderstanding of the technique’s limitations has blinded many researchers to its limited wider applicability. This monograph discusses how the test actually works, the significant engineering difficulties with standardization between machines, which types of explosives are suited to the test and which are not, and finally offers a few suggestions for alternatives when a more quantified understanding of a material’s response is required for other applications.

Assessment of Dynamic Responses of Skin Simulant in a Drop Weight Penetration Test

2016 ◽  
Vol 715 ◽  
pp. 33-38
Author(s):  
Jonas A. Pramudita ◽  
Masashi Kato ◽  
Yuji Tanabe
Keyword(s):  
Penetration Depth ◽  
Assessment Method ◽  
Dynamic Responses ◽  
Curvature Radius ◽  
Penetration Test ◽  
Static Test ◽  
Drop Weight ◽  
Weight Test ◽  
Drop Weight Test ◽  
Test Result

Skin laceration injury caused by a penetration of small curvature edge frequently occurs in a domestic accident. An assessment method for this injury is necessary in order to develop a safer manufactured product. To assess the risk of skin laceration injury in a penetration accident, a skin simulant made from silicone rubber was proposed. However, mechanical responses of this skin simulant under dynamic penetration loading have not yet been investigated. In this study, a drop weight penetration test device was developed in order to simulate penetration accidents under impact velocities of over 1 m/s. The device was then used for investigating the dynamic responses of skin simulant against several blades with different tip curvature radii. Load, penetration depth, impulse and energy at rupture were then determined from the test results. Load and penetration depth at rupture increased with the increase of tip curvature radius of the blades. Furthermore, the drop weight test result showed larger response compared to the quasi-static test result which might be caused by the viscous effect and the polymer characteristics such as cross-linking of the skin simulant.

Instrumented drop-weight test results for normalised and tempered 9Cr1Mo steel

1996 ◽  
Vol 69 (3) ◽  
pp. 253-261 ◽  
Author(s):  
A. Moitra ◽  
P.R. Sreenivasan ◽  
S.K. Ray ◽  
S.L. Mannan
Keyword(s):  
Test Results ◽  
Drop Weight ◽  
Weight Test ◽  
Drop Weight Test

Impact Testing of Concrete Using a Drop-Weight Impact Machine

2015 ◽  
Vol 1106 ◽  
pp. 225-228 ◽  
Author(s):  
Stanislav Rehacek ◽  
Petr Hunka ◽  
David Citek ◽  
Jiri Kolisko ◽  
Ivo Simunek
Keyword(s):  
Positive Impact ◽  
Impact Load ◽  
Impact Testing ◽  
Impact Loads ◽  
Test Machine ◽  
Impact Machine ◽  
Drop Weight ◽  
Weight Test ◽  
Load Tests ◽  
Drop Weight Test

Fibre-reinforced composite materials are becoming important in many areas of technological application. In addition to the static load, such structures may be stressed with short-term dynamic loads or even dynamic impact loads during their lifespan. Impact loading of structural components produces a complex process, where both the characteristics of the design itself and the material parameters influence the resultant behavior. It is clear that fibre reinforced concrete has a positive impact on increasing of the resistance to impact loads. Results of two different impact load tests carried out on drop-weight test machine are presented in this report.

Crucial Parameters of the Drop-Weight Test for IF Steels

2006 ◽  
pp. 107-115
Author(s):  
Angelika Spalek ◽  
Gerd Reisner ◽  
Ewald Werner ◽  
Andreas Pichler ◽  
Peter Stiaszny
Keyword(s):  
Drop Weight ◽  
Weight Test ◽  
Drop Weight Test

Effect of specimen size and ball size on breakage throughput in the drop-weight test

2018 ◽  
Vol 233 (2) ◽  
pp. 202-210 ◽  
Author(s):  
Mehdi Akhondizadeh ◽  
Masoud Rezaeizadeh
Keyword(s):  
Impact Energy ◽  
Specimen Size ◽  
Test Machine ◽  
Ball Size ◽  
Drop Weight ◽  
Weight Test ◽  
Drop Weight Test ◽  
Steel Balls ◽  
The Impact ◽  
Specific Impact

Effects of specimen size and ball size on the breakage throughput under the impact loading are investigated using a drop-weight test machine. Samples are square-shaped building stones ranging 20–60 mm in width and 22–256 g in mass. They include granite, marble, and two types of travertine with the thickness of 15 mm. The impact energies, up to 160 J, are achieved by falling balls in a drop-weight test machine. Several steel balls with the diameter of 60, 84, 96, and 120 mm have been used as an impactor. The ball size is a parameter whose effect on the breakage throughput is investigated here. Results show that the larger specimens have better breakage than the smaller ones at the same specific impact energy. It is also indicated that, at constant specific impact energy, the smaller balls behave more efficiently than the larger balls.

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