Prediction of the mean folding force during the axial compression in foam-filled grooved tubes by theoretical analysis

2012 ◽  
Vol 37 ◽  
pp. 144-151 ◽  
Author(s):  
Abbas Niknejad ◽  
Mohammad Mahdi Abedi ◽  
Gholam Hossein Liaghat ◽  
Mohammad Zamani Nejad
Keyword(s):  
Theoretical Analysis ◽  
Axial Compression ◽  
Foam Filled ◽  
The Mean

scholarly journals Effects of Structure Boundary Conditions and Snow-Pack Properties on Snow-Creep Pressures

1989 ◽  
Vol 13 ◽  
pp. 175-179
Author(s):  
D.M. McClung ◽  
J.O. Larsen
Keyword(s):  
Theoretical Analysis ◽  
Field Data ◽  
Nonlinear Deformation ◽  
Design Consideration ◽  
Snow Pack ◽  
Deformation Law ◽  
Linear Creep ◽  
The Mean ◽  
Structure Boundary ◽  
Analytical Expressions

Structures placed in deep snow covers are subject to forces caused by interruption of the down-slope snow-pack deformation components. The resulting creep pressures are often the primary design consideration. In this paper, accurate field data (pressures) and theoretical analysis of the problem using a linear creep law to define snow deformation are presented. Results include analytical expressions for the pressures, and it is demonstrated that the resulting linear theory underestimates the mean pressures by about 20%. Higher accuracy will require that a nonlinear deformation law be formulated.

Theoretical analysis of free convection in a partially foam-filled enclosure

2018 ◽  
Vol 55 (7) ◽  
pp. 1937-1946 ◽  
Author(s):  
Kamel Hooman ◽  
Hosein Sadafi ◽  
Simone Mancin ◽  
Giulia Righetti ◽  
Gongming Xin
Keyword(s):  
Theoretical Analysis ◽  
Free Convection ◽  
Foam Filled

CRUSHING CHARACTERISTICS OF SOIL PARTICLE ON THE EFFECT OF STRESS PATH

2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Keigo Fukuda ◽  
Haruyuki Yamamoto
Keyword(s):  
Axial Compression ◽  
Mechanical Characteristics ◽  
Shear Failure ◽  
Stress Path ◽  
Deviatoric Stress ◽  
Particle Crushing ◽  
Principal Stresses ◽  
The Mean ◽  
Lode Angle ◽  
Failure Line

In previous studies, we have conducted tests under various conditions of stress for the particle crushing. Anyway, it is necessary to perform the crushing test that assumed stress conditions in ground under controlled each principal stresses individually, to find the mechanical characteristics of the soil with particle crushing. Therefore, the purpose of this study is to confirm the effect for particle crushing under various stress paths in the combination of principal stresses. We planned four combinations of principal stresses when operate the mean stress p and deviatoric stress q up to the Shear Failure Line (SFL) on the 𝜋-plane. First, we set tri-axial extension test as Lode angle 𝛳=60° and tri-axial compression test as 𝛳=0°, and set two of the remainder as 𝛳=40°, 20°. The crushing tests are carried out using the high pressure true tri-axial compression apparatus under the planned stress paths. As a result, the progress of the particle crushing becomes active in order of 𝛳=40°, 20°, 60°, 0°, and found out that deviatoric stress q has essential effect on the particle crushing.

The Analysis of Implement of SiPM in LDRI System

2014 ◽  
Vol 556-562 ◽  
pp. 1749-1752
Author(s):  
Yi Shuo Song ◽  
Wei Cai ◽  
Xiao Ping Du
Keyword(s):  
Theoretical Analysis ◽  
High Voltage ◽  
Dynamic Range ◽  
Thermal Protection ◽  
Driving Voltage ◽  
Incident Power ◽  
Key Technology ◽  
Phase Discrimination ◽  
The Mean ◽  
Range Error

LDRI system stands for Laser Dynamic Range Imager. It has been used in STS-114 mission in 2005 as the main sensors to realize an on-orbit inspection of the thermal protection system which covers the Orbiter spacecraft. The basic of LDRI is phase discrimination and the key technology is the realization of optoelectronic mixing (OEM) using ICCD. Unfortunately, 2 main drawbacks arise from the usage of ICCD, including the high voltage (~2000V) of PMT drivers and the difficulties in high voltage modulations. SiPM is a rather novel detector which has the similar performances as PMT does but only requires a driving voltage of about 30V. Recently, the SiPM based OEM has been proved and this implies the implement of SiPM in LDRI system. In this paper, the basic of LDRI and SiPM are summerized and some theoretical analysis and simulations are made to verify the feasibility of implement of SiPM in LDRI system. The results show that SiPM is capable of realizing phase discrimination regardless of the high driving voltage and difficulties in modulations. The mean range error is found to be no more than 0.4mm within a range of 5m and an average incident power of 6nW.

Research on Load-Bearing Performance of I-Shaped Column under Cyclic Compression

2014 ◽  
Vol 904 ◽  
pp. 460-464
Author(s):  
Xiao Jing Chen ◽  
Ping Yang ◽  
Hu Wei Cui
Keyword(s):  
Theoretical Analysis ◽  
Axial Compression ◽  
Perfect Match ◽  
Theoretical Method ◽  
Vertical Deflection ◽  
Load Bearing ◽  
Compression Load ◽  
Cyclic Compression ◽  
Comparison Of The Results ◽  
The Relationship

This paper presents a theoretical method to analyze the load bearing capability under cyclic axial compression load. The relationship between axial force and vertical deflection of I-shaped column is obtained by theoretical analysis and derivation. To verify the method and formulas of the paper, an illustrative example column is analyzed by the presented theoretical method and FEM to discuss the deflection performance and load bearing capability. The comparison of the results indicates perfect match between theoretical and numerical ones. It is shown that the theoretical analysis is feasible and reasonable.

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