Results 31 to 40 of about 145,655 (304)

Prediction Model of Drilling Performance for Percussive Rock Drilling Tool

Advances in Civil Engineering, 2020
This study suggests a method for quantitatively estimating the drilling performance of the down-the-hole (DTH) hammer during percussive drilling of rock surfaces. A pneumatic dynamic model of the DTH hammer was developed that considers the mass flow rate
Dae-Ji Kim, Jaewon Kim, Booyeong Lee, Min-Seok Shin, Joo-Young Oh, Jung-Woo Cho, Changheon Song   +6 more
doaj   +1 more source

Performance enhancement of nylon/Kevlar fiber composites through viscoelastically generated pre-stress [PDF]

, 2013
Kevlar-29 fibers have high strength and stiffness but nylon 6,6 fibers have greater ductility. Thus by commingling these fibers prior to molding in a resin, the resulting hybrid composite may be mechanically superior to the corresponding single fiber ...
Cao, Cohen, Cui, Daynes, Fancey, Fancey, Fancey, Fancey, Faur-Csukat, Fazal, Fazal, Hadi, Hine, Hufenbach, Jang, Knoester, Lafitte, Mertiny, Motahhari, Motahhari, Pang, Pang, Pang, Pang, Thanomsilp, Timoshenko, Wisnom   +26 more
core   +1 more source

Impact noise test method using a modified hammer machine [PDF]

The Journal of the Acoustical Society of America, 1975
The current national (ASTM E-492) and international (ISO-R140/R717) impact method involves the use of a standard hammer machine for evaluating the impact noise isolation of floor/ceiling structure. The method has been severely criticized on the ground that ratings based on the test data correlate poorly with the subjective judgments of people listening
openaire   +1 more source

New tools for structural testing - Piezoelectric impact hammers and acceleration rate sensors [PDF]

35th Aerospace Sciences Meeting and Exhibit, 1997
Small-sizeultra-high-precision mechanical systems demand special testing methodologies, such as a betterhighfrequency response, a precise impact position, an extremely high repeatability, etc. Utilizing the fact that signals obtained from piezoelectric sensing elements are strongly ine uenced by the interfacing circuitry, piezoelectric sensors that can
C. Lee, C. Lin, C. Hsiao, W. Liaw, C. Lee, C. Lin, C. Hsiao, W. Liaw   +7 more
openaire   +2 more sources

Comparative Shear Tests of Bolt Rods Under Static and Dynamic Loading

Studia Geotechnica et Mechanica, 2020
This article presents the methodology and results of single shear tests of bolt rods under dynamic impact loading generated by means of a drop hammer. Comparative analysis was also performed for bolt rod load capacity, stress and shear work under static ...
Pytlik Andrzej
doaj   +1 more source

Impact Resistance Test and Numerical Simulation Study of Scrap Steel Fiber Rubber Concrete

Buildings
The scrap steel fibers (SSF) produced by mechanical processing are processed and added to rubber concrete (RC) to make scrap steel fiber rubber concrete (SSFRC), so as to enhance the strength of the rubber concrete.
Mingshuai Li, Yongtao Gao, Chengzhao Wang, Youzhi Li, Tao Fan   +4 more
doaj   +1 more source

Rebound hammer tests of high-strength concrete: Effects of internal stress and the shape of the impact area of the test specimens on the measurement results [PDF]

, 2019
This study examines the factors affecting the results of non-destructive testing of high-strength concrete performed on cubes and on cylinders and examines the processing of calibration relations.
Bodnarová, Lenka, Brožovský, Jiří, Brožovský, Jiří   +2 more
core   +2 more sources

On an Impact Testing Machine of Drop Hammer Type

journal of the Japan Society for Testing Materials, 1961
In order to research on the behaviors of destruction of carbon steel forgings by impact bending, we designed an impact testing machine of drop hammer type. The total height of this testing machine is about 5m. The weights of the used drop hammers are 12.5, 25 and 50kg respectively. The maximum distance from the position of test piece to the drop hammer
Sadatoshi INADA, Koichi AKIZONO, Koji HANAOKA   +2 more
openaire   +2 more sources

Experimental Study on the Impact Resistance of Steel Fiber Reinforced All-Lightweight Concrete Beams under Single and Hybrid Mixing Conditions

Buildings, 2023
An impact action can cause local, or even overall, damage to structural components. This paper investigates the effect of flat and wavy steel fibers on the mechanical impact resistance of all-lightweight concrete beams under single and mixed conditions ...
Xiuli Wang, Qinyuan Wu, Wenlong Chen
doaj   +1 more source

Influence of Elastomer Layers in the Quality of Aluminum Parts on Finishing Operations [PDF]

, 2020
In finishing processes, the quality of aluminum parts is mostly influenced by static and dynamic phenomena. Different solutions have been studied toward a stable milling process attainment.
Lamikiz, Aitzol, Rivero, Asuncion, Rubio-Mateos, Antonio, Ukar, Eneko   +3 more
core   +2 more sources