An upper bound theory to approximate the natural frequencies and parameters identification of composite beams

2017 ◽  
Vol 171 ◽  
pp. 131-144 ◽  
Author(s):  
Chein-Shan Liu ◽  
Botong Li
Keyword(s):  
Upper Bound ◽  
Natural Frequencies ◽  
Composite Beams ◽  
Parameters Identification ◽  
Bound Theory ◽  
Upper Bound Theory

scholarly journals Calculation Method of Underground Cavern Loosening Pressure Based on Limit Analysis Using Upper-Bound Theory and Its Engineering Application

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Zhiwei Wang ◽  
Zhenghao Liu ◽  
Weibin Ma ◽  
Shaoshuai Shi ◽  
Lin Bu
Keyword(s):  
Upper Bound ◽  
Limit Analysis ◽  
Calculation Method ◽  
Underground Cavern ◽  
Disturbed Zone ◽  
Underground Caverns ◽  
Calculation Results ◽  
The Difference ◽  
Bound Theory ◽  
Upper Bound Theory

From the point of view of the failure mechanism of the disturbed zone, this paper uses the limit analysis upper-bound theory to analyze the calculation formula of the loosening pressure, distinguish the difference between the vertical pressure and the horizontal pressure in the underground cavern, combine the loosening characteristics of the disturbed zone with the open-type disturbed zone and the annular disturbed zone, and construct the multirigidity slider translation and rotation failure mode to discuss the calculation method of surrounding rock loosening pressure of underground caverns in upper soft and hard rock stratum. The relevant calculation examples are given, and the application of the upper-bound theory of limit analysis is demonstrated in detail. Based on the actual engineering background, the calculation results of the calculation method of the loosening pressure of the cavity based on the upper-bound theory of the limit analysis are analyzed and compared for the different depths and different types of caverns. The difference, rationality, and applicability of the calculation results of this method are analyzed and discussed.

Unconventional Tee Forming on Metal Tubes

1985 ◽  
Vol 107 (4) ◽  
pp. 392-396 ◽  
Author(s):  
L. A. Moreira Filho ◽  
H. A. Al-Qureshi
Keyword(s):  
Upper Bound ◽  
Work Hardening ◽  
Experimental Results ◽  
Empirical Expression ◽  
Forming Load ◽  
Tee Junction ◽  
The Relationship ◽  
Bound Theory ◽  
Good Agreement ◽  
Upper Bound Theory

An experimental machine using elastomer rod has been developed for the forming of tee-junction on metal tubes. This was achieved by applying loading-unloading cycles to the tube and the elastomer simultaneously. The success of the operation is governed by the so called “clearance height” which controls the relationship between the displaced volume of the elastomer and the reduced length of the tube. Present experiments have confirmed the validity of the empirical expression previously found. The upper-bound theory is found to be in good agreement with experimental results, for predicting the total forming load. The experiments were performed on materials with different work-hardening characteristics. In addition, the effects of other variables on the process are examined.

Investigation of Bearing Strength of Single-Bolt Double-Lap Joints in Composite Laminate

2013 ◽  
Vol 577-578 ◽  
pp. 573-576
Author(s):  
Li Nan Cheng ◽  
Xi Tao Zheng ◽  
Chun Yang Tan
Keyword(s):  
Upper Bound ◽  
Composite Laminate ◽  
Lap Joints ◽  
Test Results ◽  
Engineering Approach ◽  
Failure Region ◽  
Static Zone ◽  
Bound Theory ◽  
Good Agreement ◽  
Upper Bound Theory

Based on the Upper Bound Theory, a Simplified Engineering Approach is Presented to Determine the Ultimate Strength of a pin-Loaded Composite Laminate in this Papaer. According to the Upper Bound Theory, the Displacement Rate in a Given Ply is Divided into Two Zones: the Moving Zone and the Static Zone. the Applied Load Q that Associated with Displacement must be Less than the Maximum Resistance of the Laminate. in this Paper we have Discussed the Failure Region, Failure Type of each Ply and Simplified the Tsai-Wu Failure Criterion. Experiments of Single-Bolt Double-Lap Joints have been Conduncted According to ASTM D5961 Test Standard. Finally, we can Observe that the Engineering Approach is in Good Agreement with the Test Results.

Low-dimensional models from upper bound theory

2011 ◽  
Vol 240 (2) ◽  
pp. 241-248 ◽  
Author(s):  
Gregory P. Chini ◽  
Navid Dianati ◽  
Zhexuan Zhang ◽  
Charles R. Doering
Keyword(s):  
Upper Bound ◽  
Dimensional Models ◽  
Low Dimensional ◽  
Bound Theory ◽  
Upper Bound Theory

Study on the Critical Height of Homogeneous Clay Slope

2011 ◽  
Vol 368-373 ◽  
pp. 3015-3021
Author(s):  
Yue Nan Jiang
Keyword(s):  
Upper Bound ◽  
Sliding Mode ◽  
Slip Surface ◽  
Critical Height ◽  
Energy Principle ◽  
Bound Theory ◽  
Upper Bound Theory

Small cohesion clay slope is possible to slide along the plane slip surface or log-spiral slip surface. Based on the upper bound theory and energy principle, this paper deduced the critical height of the inclined top clay slope. The sliding mode of plane slip surface and log-spiral slip surface is studied. Finally, an engineering example is analyzed and the critical height calculation is introduced.

The research of design method for anchor cables applied to cavern roof in water-rich strata based on upper-bound theory

2016 ◽  
Vol 53 ◽  
pp. 120-127 ◽  
Author(s):  
B. Jiang ◽  
Q. Wang ◽  
S.C. Li ◽  
Y.X. Ren ◽  
R.X. Zhang ◽  
...  
Keyword(s):  
Upper Bound ◽  
Design Method ◽  
Bound Theory ◽  
Upper Bound Theory
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