High impact force attenuation of reinforced concrete systems

In this study, the influence of crack conduction method on behavior of reinforced concrete (RC) frame under iterative high impact loading were experimented. To investigate the structural behavior through large deformations and progressive damage and to identify the failure modes, the falling weight and falling height were set more than the structural strength in elastic state. A comprehensive scheme which indicated influence of location of initial cracks on behavior and failure mode of structure was developed. Falling weight impact test was conducted on twenty-one laboratory scaled RC frames which were categorized in four series regard to considered scheme. Concrete volume and compressive strength, number of longitudinal and transverse rebar were constant factors in all specimens. Deformed shape and crack patterns, developed on the side surface of the RC frames, were sketched and total deflections vs. cumulative input energy of the RC girder were plotted. The results revealed the influence of crack conduction on improving the structural behavior and extending the endurance of RC frames against iterative high impact loading.

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Fiber Bragg Grating High Impact Force Sensors With Adjustable Sensitivity and Dynamic Range

IEEE Sensors Journal ◽

10.1109/jsen.2019.2907867 ◽

2019 ◽

Vol 19 (14) ◽

pp. 5670-5679

Author(s):

Hannah A. Dinovitzer ◽

Albane Laronche ◽

Jacques Albert

Keyword(s):

Fiber Bragg Grating ◽

Dynamic Range ◽

Impact Force ◽

High Impact ◽

Bragg Grating ◽

Force Sensors

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Impact and Ricocheting of a Cannonball Colliding onto Sea by Nose-Cone Shape

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.284-287.778 ◽

2013 ◽

Vol 284-287 ◽

pp. 778-784

Author(s):

Woo Chun Choi ◽

Soung Min Chung ◽

Han Seok Bang ◽

Hae Suk Lee ◽

Yeon Sik Cho

Keyword(s):

Velocity Potential ◽

Sea Water ◽

Impact Force ◽

Incident Angle ◽

Pressure Coefficient ◽

High Impact ◽

Panel Method ◽

Radius Of Curvature ◽

Nose Cone

When a cannonball collides with sea water, the resulting impact force influences the cannonball trajectory, depending on launching angle, initial firing speed, incident angle, and cannonball nose-cone shape. In this study, the effect of nose-cone shape of a cannonball on impact and ricocheting behavior was investigated. During collision, the flow was assumed to be non viscous and incompressible, and a source panel method was used to determine velocity potential and pressure coefficient. The nose-cone shape was expressed by Haack-series. It was found that as the radius of curvature of a cannonball nose-cone decreases, a high impact force is resulted, and that depending on impact force and impulse, the ricocheting distance varies. The results obtained in this study can be used in researching and developing new cannonballs.

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Prediction of the impact force on reinforced concrete beams from a drop weight

Advances in Structural Engineering ◽

10.1177/1369433216649384 ◽

2016 ◽

Vol 19 (11) ◽

pp. 1710-1722 ◽

Cited By ~ 26

Author(s):

Thong M Pham ◽

Hong Hao

Keyword(s):

Reinforced Concrete ◽

Concrete Beams ◽

Impact Force ◽

Reinforced Concrete Beams ◽

Drop Weight ◽

The Impact

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3832 Effective Bodily Motion for High Impact Force Generation in Martial Arts

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2006.7.0_131 ◽

2006 ◽

Vol 2006.7 (0) ◽

pp. 131-132

Author(s):

Takao HASHIMOTO ◽

Hiroaki HASEGAWA ◽

Hitoshi DOKI ◽

Masaki HOKARI

Keyword(s):

Martial Arts ◽

Impact Force ◽

High Impact ◽

Force Generation

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Pitting Corrosion Diagnosis of Bearing Based on Power Cepstrum and Histogram

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.512-515.1672 ◽

2012 ◽

Vol 512-515 ◽

pp. 1672-1676 ◽

Cited By ~ 1

Author(s):

Shu Fang ◽

De Liang Li ◽

Li Tao Liu ◽

Zhen Wei Zhang

Keyword(s):

Pitting Corrosion ◽

Vibration Amplitude ◽

Radial Direction ◽

Impact Force ◽

Axial Direction ◽

High Impact ◽

New Method ◽

Outer Ring ◽

Heavy Load ◽

Bearing Race

The axle assembly of fire robot need endure both heavy load and high impact force, and the pitting corrosion in the bearing race become a commom fault. In this paper, the vibration of bearing both in the inner ring and outer ring was analyzed, the characteristics of bearing with pitting corrosion were also analyzed, and based on those characteristics a new method for pitting corrosion diagnosis were proposed, in this method the power cepstrum in the axial direction and histogram of the vibration amplitude in the radial direction were used for detecting the pitting corrosion of bearing, and experiments results proved the practicability and effectiveness of this method.

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