Laboratory study on the relationship between pavement texture and tread rubber penetration depth

2020 ◽  
pp. 1-14
Author(s):  
Di Yun ◽  
Aimin Sha ◽  
Liqun Hu ◽  
Cheng Tang ◽  
Jie Gao
Keyword(s):  
Penetration Depth ◽  
Laboratory Study ◽  
The Relationship ◽  
Tread Rubber

Experimental Investigation on Rotary Punching by the Compression of Polyurethane Pad

2014 ◽  
Vol 941-944 ◽  
pp. 1802-1807 ◽  
Author(s):  
Qian Liu ◽  
Jing Tao Han ◽  
Jing Liu ◽  
Xiao Xiong Wang
Keyword(s):  
Penetration Depth ◽  
Process Parameters ◽  
High Load ◽  
Large Area ◽  
Bear Capacity ◽  
Hole Edge ◽  
Quality Degradation ◽  
Series Of Experiments ◽  
Blanking Process ◽  
The Relationship

Rotary punching is a sheet metal blanking process which utilizes shearing tools fixed to a pair of rollers. The polyurethane pad is adopted as the die instead of rigid mold because it has the advantages of wide hardness range and high load-bear capacity. Due to the application of polyurethane pad, the surrounding region adjacent to the pierced hole will occur to plastically deform and deflect, which greatly differs from that in the conventional blanking. In this paper, the effects of blank material and thickness, polyurethane hardness, punch penetration depth on deformation behavior were mathematically analyzed and modeled, and then a series of experiments through varying process parameters were conducted to validate the relationship between process parameters and product quality. The degree of sample deflection was exactly measured by scanning electron microscope (SEM). The results show that the deformed area varies with different blank elongations and increases with increasing blank thickness for a given material. When polyurethane pad with low hardness level is employed, it results in large area deformation and quality degradation. Moreover, the deflection degree around the hole edge becomes more severe along with punch penetration, but the penetration depth along blank thickness is not in proportion to the amount of punch advancement.

scholarly journals Buried Depth of a Submarine Pipeline Based on Anchor Penetration

2019 ◽  
Vol 7 (8) ◽  
pp. 257
Author(s):  
Xueyuan Zhu ◽  
Qinglong Hao ◽  
Jie Zhang
Keyword(s):  
Numerical Simulation ◽  
Penetration Depth ◽  
Water Depth ◽  
Calculation Method ◽  
Water Surface ◽  
Submarine Pipeline ◽  
Projected Area ◽  
Actual Measurement ◽  
Calculation Results ◽  
The Relationship

Anchor penetration is an important issue involved in the study of submarine pipeline damage accidents. To explore the penetration of a ship’s anchor under certain conditions, this study investigated the motion and force of an anchor and formulated a calculation method for the bottoming speed of an anchor. Meanwhile, the depth of anchor penetration was calculated under different conditions according to bottoming speed through programming. Finally, the reliability of the calculation method for the penetration depth was verified by comparing the actual measurement and the numerical simulation. On the basis of the findings, the calculation results were further analyzed, and conclusions were derived regarding the relationship between anchor mass, the horizontal projected area of the anchor, the anchor height on the water surface, and water depth. The conclusions provide suggestions for the application of anchor penetration in terms of seabed depth with certain reference values.

The Numerical Simulations of Forces Acting on TBM Disc Cutters with the Consideration of Confining Pressure and Damage in Rocks

2011 ◽  
Vol 105-107 ◽  
pp. 1170-1174
Author(s):  
Hui Yun Li ◽  
Guang Yu Shi
Keyword(s):  
Penetration Depth ◽  
Cutting Forces ◽  
Confining Pressure ◽  
Material Model ◽  
Disc Cutter ◽  
Finite Element Software ◽  
Linear Dynamic ◽  
Dynamic Finite Element ◽  
Disc Cutters ◽  
The Relationship

This paper gives a brief explanation of the failure mechanism of rock fragmentation in rock cutting. The JOHNSON_HOLMGIST_CONCRETE is selected as the rock material model in numerical simulation with confining pressure and damage influence introduced. We use the non-linear dynamic finite element software LS/DYNA to simulate the dynamic process of cutting rock. The cutting forces acting on disc cutter are computed. The relationship between cutting forces and penetration depth, confining pressure and damage parameters are obtained. The results show that, the cutting forces increase with the penetration depth. They are larger in equal confining pressure than unequal condition. The forces are amplified with the damage parameters increasing. The conclusion provides a reference for the prediction of the cutting forces.

Relation of Spelling and Writing in Learning Disabilities

1987 ◽  
Vol 64 (1) ◽  
pp. 219-236 ◽  
Author(s):  
Nils Søvik ◽  
Oddvar Arntzen ◽  
Ragnar Thygesen
Keyword(s):  
Learning Disabilities ◽  
Laboratory Study ◽  
Orthogonal Design ◽  
Type Structure ◽  
Spelling Errors ◽  
Independent Variables ◽  
Psychomotor Functions ◽  
Writing Accuracy ◽  
The Relationship

The paper describes a study in which the relationship between the cognitive and psychomotor aspects of children's spelling and writing performances was investigated. By comparing data from various categories of children the relationship between the semantic and psychomotor functions could be examined, and differences between the skill performances of the three groups of students were predicted. A four-way 3 × 3 × 2 × 2 orthogonal design with categories of subjects, type, structure, and length of task as independent variables was used in the laboratory study, with 24 “normal”, 24 dyslexic, and 24 dysgraphic nine-year-old children as subjects. Most of the 16 hypotheses were verified by data identifying some of the spelling and writing characteristics of the three groups of children and the effects of contextual parameters on their performances. Dyslexic children, for example, seemed to write more slowly than the others, and their mean score of spelling errors was the highest one, whereas the dysgraphic children had the lowest mean score in writing accuracy and rhythm.

Study on Corner Contact Shock of Gear Transmission by ADAMS Software

2015 ◽  
Vol 778 ◽  
pp. 205-211
Author(s):  
Li He ◽  
Jin Yuan Tang
Keyword(s):  
Penetration Depth ◽  
Impact Velocity ◽  
Impact Force ◽  
Ansys Software ◽  
New Approach ◽  
Adams Software ◽  
Simulation Results ◽  
The Impact ◽  
The Relationship ◽  
Key Parameter

Solving gear meshing impact force problems by using ADAMS software is studied.A pair of tooth meshing model is established based on UG, modal neutral file is generated by using ANSYS software, calculating gear meshing impact after Importing ADAMS. The relationship between the impact velocity and the impact force by taking reasonable key parameter about penetration depth in ADAMS simulation.A new approach for studying gear meshing impact is proposed here, and the simulation results show that ADAMS software is a very useful tool for solving gear corner contact shock problems outside the normal path of action line.

Effect of Aggregate Volume Fraction on the Charge Passed of Mortar and Concrete

2009 ◽  
Vol 405-406 ◽  
pp. 283-288 ◽  
Author(s):  
Quan Lin Niu ◽  
Chong Zhi Li
Keyword(s):  
Penetration Depth ◽  
Volume Fraction ◽  
Low Permeability ◽  
Chloride Permeability ◽  
Volume Fractions ◽  
Aggregate Fraction ◽  
Low Charge ◽  
Astm C1202 ◽  
The Relationship ◽  
Cl Permeability

Charge passed of mortars with different aggregate volume fractions was tested according to ASTM C1202, and the differential expression of the Ohm law was introduced to explain the relationship between charge passed data and aggregate fractions.Cl- penetration depth of the corresponding mortars and concretes was measured to illustrate the influence of the aggregate volume fraction on their chloride permeability. It was shown that the charge passed of mortar was negatively correlated with aggregate volume fractions, and high aggregate fraction bearing concrete with low charge passed did not necessarily mean low permeability. As a result, the influence of aggregate fraction on charge passed should be taken into consideration when charge passed data was employed to evaluate Cl- permeability of concrete.

Relationship between Introversion/Extraversion, Values regarding Control over Information, and Perceptions of Invasion of Privacy

1986 ◽  
Vol 62 (2) ◽  
pp. 371-376 ◽  
Author(s):  
Dianna L. Stone
Keyword(s):  
Individual Differences ◽  
Laboratory Study ◽  
Personal Information ◽  
Personal Data ◽  
Personality Inventory ◽  
Eysenck Personality Inventory ◽  
Invasion Of Privacy ◽  
The Relationship

A laboratory study examined the relationship between individual differences in introversion/extraversion, values regarding control over personal information, and perceptions of invasion of privacy. 119 subjects were asked to complete the Eysenck Personality Inventory, a personal data questionnaire, a measure of values regarding control over information, and a measure of perceived invasion of privacy. Regression/correlational analyses indicated that both introversion and values regarding control over personal information were positively related to perceptions of invasion of privacy.

scholarly journals Effects of decay on the shear properties of nailed joints parallel and perpendicular to the grain

2021 ◽  
Vol 67 (1) ◽  
Author(s):  
Rintaro Ueda ◽  
Kei Sawata ◽  
Takanobu Sasaki ◽  
Yoshihisa Sasaki
Keyword(s):  
Penetration Depth ◽  
Initial Stiffness ◽  
Shear Properties ◽  
Maximum Resistance ◽  
Loading Direction ◽  
Low Load ◽  
Timber Constructions ◽  
Pilodyn Penetration ◽  
Loading Tests ◽  
The Relationship

AbstractInformation on the properties of nailed joints with decayed member is necessary to evaluate the remaining structural properties of timber constructions. In this study, loading tests were conducted on nailed joints parallel and perpendicular to the grain with decayed members, and the relationship between the decrease in shear properties and the loading direction to the grain was investigated. After the loading tests, the extent of decay of the specimens was evaluated by the penetration depth of Pilodyn and the decay depth, and these were compared with the shear properties of the nailed joints. The nailed joints with decay had a low load at the initial deformation, regardless of the loading direction to the grain. The initial stiffness, yield resistance, and maximum resistance of the nailed joints parallel to the grain were negatively correlated with the Pilodyn penetration depth, and those of the nailed joints perpendicular to the grain showed no significant correlation with the Pilodyn penetration depth at the 5% level. The initial stiffness, yield resistance, and maximum resistance of the nailed joints parallel to the grain tended to decrease with increasing decay depth, and those of the nailed joints perpendicular to the grain did not exhibit this tendency. The shear properties of the nailed joints significantly decreased at small decay depths.

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