scholarly journals Response of round-hole tubes submitted to pure bending creep and pure bending relaxation

2021 ◽  
Vol 13 (9) ◽  
pp. 168781402110491
Author(s):  
Kuo-Long Lee ◽  
Bo-You Liu ◽  
Wen-Fung Pan
Keyword(s):  
Experimental Study ◽  
Aluminum Alloy ◽  
Theoretical Analysis ◽  
Research Team ◽  
Hole Diameter ◽  
Thickness Ratio ◽  
Experimental Results ◽  
Round Hole ◽  
Pure Bending ◽  
Time Relationship

This paper presents experimental study on the response of 6061-T6 aluminum alloy round-hole tubes with five different hole diameters of 2, 4, 6, 8, and 10 mm and four different diameter-to-thickness ratios of 30, 40, 50, and 60 submitted to pure bending creep and pure bending relaxation. Pure bending creep or relaxation is defined as bending the tube to the required moment or curvature and maintaining that moment or curvature for a period of time. The experimental results of pure bending creep show that the curvature increases with time. In addition, larger holding moment, diameter-to-thickness ratio, or hole diameter results in larger creep curvature. As the curvature continues to increase, the round-hole tube eventually breaks. The experimental results of pure bending relaxation show that the relaxation moment decreases sharply with time and tends to a stable value. In addition, larger holding curvature, diameter-to-thickness ratio, or hole diameter results in larger drop of the relaxation moment. Due to fixed curvature, the round-hole tube does not break. Finally, formulas proposed by the research team of Pan et al. were respectively improved to simulate the creep curvature-time relationship for pure bending creep in the initial and the secondary stages and the relaxation moment-time for pure bending relaxation. After comparing with the experimental results, it is found that theoretical analysis can reproduce the experimental results reasonably.

Experimental Study on Full-Scale Segment Model of Huaian Cable-Stayed Bridge Pylon

2011 ◽  
Vol 243-249 ◽  
pp. 1866-1870 ◽  
Author(s):  
Hong Yuan Tang ◽  
Shao Ping Meng
Keyword(s):  
Experimental Study ◽  
Stress Distribution ◽  
Theoretical Analysis ◽  
Full Scale ◽  
Experimental Results ◽  
Horizontal Load ◽  
Experiment Study ◽  
Segment Model ◽  
Cable Stayed Bridge

Through experiment study on full scale segmental model of Huaian bridge pylon, the stress distribution in the segmental model under the U shaped tendons and the horizontal load was measured. At the same time, the critical cracking load and the coefficient cracking safety class of the anchorage zone were obtained. At last, the theoretical analysis was compared with the experimental results, the theory agreed with the experiment well.

Superplastic Forming of Aluminum Alloy Car Body Panels

2005 ◽  
Vol 475-479 ◽  
pp. 3025-3028 ◽  
Author(s):  
Zhi Peng Zeng ◽  
Yan Shu Zhang ◽  
Yi Zhou ◽  
Quan Lin Jin
Keyword(s):  
Experimental Study ◽  
Aluminum Alloy ◽  
Superplastic Forming ◽  
Experimental Results ◽  
Temperature Controller ◽  
Car Body ◽  
Shape Characters

An experimental study on superplastic forming of a front fender of 5182 aluminum alloy is presented in this paper. Based on the shape characters of the front fender and the material experimental results, dies, heater and temperature controller for superplastic forming of the fender are designed and manufactured. The SPF results show the designed processing and dies are reasonable and feasible.

scholarly journals Variation of the 90° Redundant-hole Diameter Effect on the Response and Failure of Round-hole 6061-T6 Aluminum Alloy Tubes under the Cyclic Bending

2020 ◽  
Vol 9 (4) ◽  
pp. 187-195
Author(s):  
Kuo-Long Lee ◽  
Wen-Fung Pan
Keyword(s):  
Aluminum Alloy ◽  
Analytical Data ◽  
Bending Moment ◽  
Hole Diameter ◽  
Round Hole ◽  
Cyclic Bending ◽  
Straight Lines ◽  
Aluminum Alloy Tube ◽  
Diameter Effect ◽  
Good Agreement

This paper presents an experiment and an analysis for examining the variation of the 90° redundant-hole diameter effect on the cyclic bending mechanical behavior and fracture failure of round-hole 6061-T6 aluminum alloy tubes. In this investigation, a round-hole 6061-T6 aluminum alloy tube with a 6 mm hole diameter was drilled to obtain a 90° redundant hole but with different hole diameter of 2, 4, 6, 8, or 10 mm. It can be observed that from the first bending cycle, the bending moment-curvature curve describes a stable loop. The diameter of the 90° redundant hole has little effect on the bending moment-curvature relationship. However, when the number of bending cycles increases, the ovalization-curvature curve shows an increasing, asymmetrical, ratcheting, and bow-like tendency. The diameter of 90° redundant-hole shows a significant influence on the ovalization-curvature relationship. In addition, five non-parallel straight lines corresponding to five different 90° redundant hole diameters were discovered for the controlled curvature-number of bending cycles necessary to cause failure relationship on the double logarithmic coordinates. Finally, a formula was presented to simulate the above relationship. It is found that the experimental and analytical data were in good agreement.

scholarly journals Effect of laser deweighting on properties of ZL205A aluminum alloy

2021 ◽  
Vol 2137 (1) ◽  
pp. 012033
Author(s):  
Guang Li ◽  
Zhipeng Wei ◽  
Junlong Wang ◽  
Yangyang Zhang ◽  
Chen Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Surface Roughness ◽  
Aluminum Alloy ◽  
Surface Morphology ◽  
Pulse Laser ◽  
Process Parameters ◽  
Experimental Results ◽  
Matrix Properties ◽  
Before And After ◽  
The Matrix

Abstract In this paper, a nanosecond fiber pulse laser is used to carry out the experimental study on laser weight removal of ZL205A aluminum alloy gyro rotor. By optimizing the process parameters of laser weight removal, better surface morphology was obtained. The effects of surface roughness, metallographic structure and hardness of samples before and after laser deweighting were analyzed. The experimental results show that the laser weight removal does not affect the matrix properties of ZL205A aluminum alloy. The laser de-weight technology is suitable for the balance of ZL205A aluminum alloy gyro rotor.

Study of Critical Velocity of Stick-Slip Sliding

1960 ◽  
Vol 82 (4) ◽  
pp. 393-398 ◽  
Author(s):  
B. R. Singh
Keyword(s):  
Experimental Study ◽  
Theoretical Analysis ◽  
Critical Velocity ◽  
Mechanical Model ◽  
Analog Computer ◽  
Experimental Results ◽  
Milling Machine ◽  
Friction Damping ◽  
Stick Slip ◽  
Electric Analog

The motion of a body sliding under boundary friction, at a velocity slower than a particular critical velocity of the system, proceeds in a discontinuous or stick-slip form. This paper presents a theoretical analysis and an experimental study of the critical velocity of stick-slip sliding. The influence of various parameters such as friction, damping, stiffness, and sliding mass of the system on the critical velocity was studied on a mechanical model arranged on a milling machine. The arrangement was also simulated on an electric analog computer. Good correlation was observed between the theoretical values and the experimental results on the mechanical model and on the analog computer.

scholarly journals Mean curvature effect on the response and failure of round-hole tubes submitted to cyclic bending

2021 ◽  
Vol 13 (11) ◽  
pp. 168781402110622
Author(s):  
Kuo-Long Lee ◽  
Yu-Chun Tsai ◽  
Wen-Fung Pan
Keyword(s):  
Mean Curvature ◽  
Hole Diameter ◽  
Experimental Results ◽  
Round Hole ◽  
Curvature Effect ◽  
Cyclic Bending ◽  
The Mean ◽  
The Moment ◽  
Straight Lines ◽  
Minimum Curvature

This paper presents an experiment and analysis to investigate the response and failure of 6061-T6 aluminum alloy round-hole tubes with different hole diameters of 2, 4, 6, 8, and 10 mm subjected to cyclic bending at different curvature ratios of −1.0, −0.5, 0.0, and +0.5. The curvature ratio is defined as the minimum curvature divides by the maximum curvature. Four different curvature ratios are employed to highlight the mean curvature effect. It can be seen from the experimental results that the moment-curvature relationships gradually relax and become steady states after a few bending cycles for curvature ratios of −0.5, 0.0, and +0.5. The ovalization-curvature relationship depicts an asymmetrical, ratchetting and increasing as the number of bending cycles increases for all curvature ratios. In addition, for each hole diameter, the relationships between the curvature range and the number of bending cycles necessary to initiate failure on double logarithmic coordinates display four almost-parallel straight lines for four different curvature ratios. Finally, this paper introduces an empirical formula to simulate the above relationships. By comparing with experimental results, the analysis can reasonably describe the experimental results.

scholarly journals Experimental Study on the Nonlinear Vibrations and n× Amplitudes of a Rotor With a Transverse Crack

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Jean-Jacques Sinou
Keyword(s):  
Experimental Study ◽  
Theoretical Analysis ◽  
Monitoring System ◽  
Nonlinear Response ◽  
Transverse Crack ◽  
Nonlinear Vibrations ◽  
Rotor System ◽  
Experimental Results ◽  
Frequency Components ◽  
On Line

In this paper, the nonlinear response of a rotor system containing a transverse crack is analyzed experimentally in order to propose a nondestructive detection of cracks in the rotor. More particularly, the evolutions of the n× superharmonic frequency components at the various subcritical resonant peaks and the decrease in the subcritical resonant speeds are investigated for various crack depths. The experimental results that are presented in this study confirm the theoretical analysis of many researchers and provide a possible basis for an on-line monitoring system.

Theoretical Analysis and Experimental Study of Strength Matching between Mortarless Grouted Concrete and Block Material

2013 ◽  
Vol 368-370 ◽  
pp. 1022-1026
Author(s):  
Ming Song Yi ◽  
Yan Qiu Xu ◽  
Ni Lou ◽  
Lan Ying Zhang ◽  
Guo Hui Yi
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Theoretical Analysis ◽  
Experimental Results ◽  
Joint Work ◽  
Matching Problem ◽  
Nonlinear Simulation ◽  
Strength Grade

In order to solve the strength matching problem of grouted concrete and block in mortarless grouted masonry, the article adopts the ANSYS nonlinear simulation to establish different strength grade models. And the result shows that, when the strength matching relationship between the mortarless block and the concrete reaches fc/fb=1~2, the grouted concrete and block compressive strength are brought into full play without material waste. The result is close to fcu/fcb = 1.5~3.5 (gross area) from the literature[1]. It is clear that, when the compressive strength of the two is close, their joint work can exert the best effects. It fits the experimental results and provides reference to the application of mortarless grouted block.

scholarly journals Theoretical and Experimental Study of Split Semi Horse Shoe Structure

2018 ◽  
Vol 7 (5) ◽  
pp. 131-136
Author(s):  
G. Singh ◽  
S. S. Pattnaik
Keyword(s):  
Experimental Study ◽  
Theoretical Analysis ◽  
Equivalent Circuit ◽  
Radiation Pattern ◽  
Patch Antenna ◽  
Circuit Theory ◽  
Experimental Results ◽  
Effective Parameters ◽  
Metamaterial Structure ◽  
Good Agreement

In this paper a new planar metamaterial structure that looks like semi-horse shoe in shape (SSHSS) is designed and simulated. Theoretical analysis of proposed structure done using equivalent circuit theory. Medium effective parameters are extracted using modified NRW approach which proved the metamaterial property of the new unit cell. Radiation pattern, directivity and gain of the new structure were illustrated which gives the possibility of using SSHSS as the antenna. Proposed structure shows multiband characteristics. This antenna shows high directivity (7.92 dBi, 7.86 dBi, 10.11 dBi) and moderate gain (2.55 dBi, 3.90 dBi, 5.07 dBi) at 5.83 GHz, 8.41 GHz, 10.68 GHz respectively. RT duroid is used for fabrication of prototype of the proposed structure. This new structure can be used as metamaterial inspired antenna as well as normal patch antenna. Experimental results shows good agreement with simulated and theoretical results.The proposed structure has been simulated using IE3D electromagnetic simulator.

Theoretical and Experimental Study on the Wave Propagation through a Micro Gap

2011 ◽  
Vol 346 ◽  
pp. 508-514
Author(s):  
Xiao Yun Chen ◽  
Gui Lan Yu ◽  
Wei Wei Cao ◽  
Wen Tao Qiang
Keyword(s):  
Experimental Study ◽  
Wave Propagation ◽  
Theoretical Analysis ◽  
Nondestructive Evaluation ◽  
Normal Incidence ◽  
Experimental Results ◽  
Harmonic Waves ◽  
Flat Interface ◽  
Gap Width

In the present paper, a preliminary exploration which includes the theoretical analysis and experimental study on the wave propagation through a micro gap was carried out. Harmonic waves, normal incidence, smooth and flat interface were taken into account. The theoretical and experimental results both show that the initial gap width has significant influences on the harmonics. Their relations may be effective on nondestructive evaluation of a pre-existing gap.

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