Results 11 to 20 of about 216,422 (329)

Estimation of Impact Hardness of Rocks by Means of Drop Hammer Test.

Shigen-to-Sozai, 1992
The impact hardness of rock is normally determined by using a ‘Protodyakonov’ type drop hammer. However, this test cannot be applied to a wide range of rocks. Therefore, standardized impact hardness test using the ‘Protodyakonov’ type drop hammer was carried out and the correlati ons of the resulting values of impact hardness with the mechanical ...
Hideki SHIMADA, Kikuo MATSUI, Masatomo ICHINOSE   +2 more
openaire   +3 more sources

Impact performance optimization of a YDC valve-type double action hydraulic hammer

Natural Gas Industry B, 2018
A YDC type hydraulic hammer is a new valve-type double action hydraulic hammer suitable for oil and gas well drilling. It is hard to find out the optimal matching relationship among various factors based on experience and experiments, for the matching ...
Xueqin Huang, Gui Hu, Qingkun Meng, Xiaofeng Zheng   +3 more
doaj   +3 more sources

Evaluation of measurement uncertainty of drop hammer impact test for composite materials [PDF]

Journal of Physics: Conference Series
Abstract Future aircraft structures are usually dominated by composites, and one of the key defects and forms of damage to composite structures is the impact damage caused by low-energy (especially low-speed) foreign matter. This kind of low-energy impact test is usually completed by the drop hammer testing machine, so accurately ...
Li Lei, Zhang Yao
openaire   +2 more sources

Railway Ballast Diagnose through Impact Hammer Test

Procedia Engineering, 2011
AbstractThis paper reports a feasibility study in the use of measured modal parameters of in-situ concrete sleepers to detect possible damage of the underlying railway ballast. There are many methods developed for monitoring and damage detection of the rail track.
Lam, H.F., Wong, M.T.
openaire   +2 more sources

THE STUDY OF ROAD PAVEMENT PERFORMANCE THROUGH IMPACT HAMMER TESTS

International Conference “Environmental Engineering”, 2020
Noise pollution has become an important issue. One of the main sources of noise in residential areas is represented by transportation and by the interaction between tyre and road surface. Several studies illustrate that traffic noise is affected by road properties such as acoustic absorption, surface texture, and mechanical impedance.
Filippo Giammaria Pratico, Gianfranco Pellicano, Rosario Fedele   +2 more
openaire   +4 more sources

A Variable-Impulse Hammer Impact Test (VIHIT) Method for Improved Mode Shape Identification [PDF]

Sensors
The impact hammer, equipped with a force transducer, is a portable and practical tool for inducing measurable excitations in structural health monitoring (SHM). However, its reliability is often limited by uncontrolled factors such as swing power, angle,
Alec Jensen, Charles Riley
doaj   +2 more sources

Responses of a Highly Accelerated Life Test System to Impacts from Different Designs of Hammers

Advances in Mechanical Engineering, 2014
The response of a table to the impact of its driving hammer in the highly accelerated life test (HALT) system depends on, among other things, the location of the hammer, the presence of multiple hammers, and the angle at which the hammer is mounted to ...
Yeong-Shu Chen, Le Hong Chuong
doaj   +2 more sources

Multiple Reference Impact Testing for Bridge Assessment with Drop Hammer

Advanced Materials Research, 2012
A new drop hammer was designed and used for multiple reference impact testing of two bridges. The drop hammer utilizes a multiple-rebound control system for successfully applying a single impact with repeatable high-level force for bridge testing. Signal analysis results indicate that the drop hammer provides a higher signal-noise ratio and a better ...
Yu Juan Liao, Yun Zhou, Peng Qin
openaire   +2 more sources

LLNL small-scale drop-hammer impact sensitivity test [PDF]

, 1995
Small-scale safety testing of explosives and other energetic materials is done to determine their sensitivity to various stimuli including friction, static spark, and impact. This testing is typically done to discover potential handling problems for either newly synthesized materials of unknown behavior or materials that have been stored for long ...
Simpson, L. R., Foltz, M. F.
openaire   +4 more sources

Impact Response Test and Ignition Characteristics of HMX/Al Energetic Composites Based on the Force-Electric Coupling Method under a Drop Hammer. [PDF]

ACS Omega
Yuan J, Han P, Zhai Z, Liu Y, Yang Q, Yang J.   +5 more
europepmc   +2 more sources