An Engineering Correction Method for Buckling Load of Dense Stiffened Panels

2020 ◽  
Vol 1003 ◽  
pp. 92-97
Author(s):  
Wen Hao Liu ◽  
Rui Xiang Bai ◽  
Kang Su ◽  
Jian Chao Zou ◽  
Da Liu ◽  
...  
Keyword(s):  
Finite Element ◽  
Calculation Method ◽  
Engineering Calculation ◽  
Correction Method ◽  
Buckling Loads ◽  
Buckling Modes ◽  
Stiffened Panels ◽  
Element Simulation ◽  
Compressive Buckling ◽  
The Stability

It is convenient for designers to get the buckling loads of sparse stiffened panels quickly by using engineering calculation method to analyze the stability of composite stiffened panels, but it is still unable to meet the accuracy requirements of analysis of dense stiffened panels. The buckling loads of stiffened panels are closely related to the buckling modes. Based on capturing and analyzing the Compressive Buckling waveforms of T-shaped densely stiffened panels, this paper presents a formula for calculating the buckling loads according to the geometric coefficients. The results are very similar to those of finite element simulation, and can be used to calculate the buckling loads of sparse and dense stiffened panels with different stiffeners.

Finite Element Analysis of Creep Induced Volume Shrinkage of Salt Caverns

2013 ◽  
Vol 353-356 ◽  
pp. 1379-1385
Author(s):  
Ming Zhang ◽  
Shao Xin Zhang ◽  
Qiang Yang
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Volume Shrinkage ◽  
Salt Rock ◽  
Simplified Models ◽  
Element Analysis ◽  
Element Simulation ◽  
Storage Volume ◽  
The Stability ◽  
Salt Caverns

Salt rock is now being used widely as storage vault of oil and gas. However, the rheological properties of salt rock have significant influence on the stability of salt caverns and, in particular, induce the reduction of storage volumes. Therefore, the classical Nishihara model is used to describe the rheology of salt rock and incorporated into the finite element simulation firstly. Then the volume shrinkage is calculated for two typical simplified models with single cavern and double caverns. The results show that the storage volume of salt cavern decreases with the internal pressure and increases with service time for either single-cavern model or double-cavern model, which remains unchanged though the volume shrinkage of one cavern is influenced by others.

The Mathematical Model of Simulative Calculation for the Process of Airbag Landing

2014 ◽  
Vol 635-637 ◽  
pp. 228-232
Author(s):  
Jian He ◽  
Ji Sheng Ma ◽  
Da Lin Wu
Keyword(s):  
Mathematical Model ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Calculation Method ◽  
Low Cost ◽  
Analytical Analysis ◽  
Heavy Equipment ◽  
Element Simulation ◽  
The Mathematical Model

Airbag is widely used in heavy equipment dropped field with its efficient cushion performance and low cost. The calculation method used now for the process of airbag landing mainly is simulative calculation: analytical analysis and finite element simulation, but there are less systematic introduction for the mathematical model behind these methods in past papers. This paper mainly does the summary for the mathematical model of vented airbag which is usually used.

Finite Element Simulation of Biting Process of Cold Rolling Strip for 6-High Mill

2011 ◽  
Vol 704-705 ◽  
pp. 203-209
Author(s):  
Xu Ma ◽  
Jing Yun Ma ◽  
Zhi Long Feng ◽  
Hong Lei Cui ◽  
Yu Yang ◽  
...  
Keyword(s):  
Finite Element ◽  
Velocity Field ◽  
Cold Rolling ◽  
Simulation Model ◽  
Shift Type ◽  
Element Simulation ◽  
Rolling Strip ◽  
The Stability ◽  
The Impact ◽  
Cold Mill

In this work, On the basis of software ANSYS/LS-DYNA, the strip cold rolling simulation model was established. The process from biting to rolling steady were simulated and investigated for 6-high UCM (6-high middle rolls shift type HC-mill with middle roll bender) cold mill, including the stress, stain state, and velocity field of the workpiece and rolls. The result states that the stability of Biting Process of 6-high cold mill is preferable and the impact of biting process on the roll is acceptable. The simulation regularity corresponds well with the measurements.

Finite Element Simulation of Excavation and Supporting of Karl Valley Quarry at Pubugou Hydropower Project

2012 ◽  
Vol 170-173 ◽  
pp. 1948-1953
Author(s):  
Guo Zhang Xu ◽  
Yi Pei Zeng ◽  
Meng Zhu He
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Constitutive Relations ◽  
Hydropower Project ◽  
Pressure Relief ◽  
Engineering Construction ◽  
Elastic Plastic ◽  
Element Simulation ◽  
Slope Excavation ◽  
The Stability

Karl Valley Quarry is the main quarry for the construction of the Pubugou Hydropower Project. With its developed faults ,veins ,dense joint-relief zones, deep pressure-relief zones and fissure, the slope has the possibility of integral and partial instability in the densely blasting and excavating process).Based on the rock elastic-plastic equivalent constitutive relations of joint-anchoring, by using the elastic-plastic element finite element method, the slope excavation and reinforcement as well as the stability is numerically simulated and analyzed. In addition, the reasonability of the initially drafted schemes for construction sequences and anchoring are evaluated and some valuable and instructive suggestions have been proposed to the engineering construction relevantly.

Stability Analysis and Finite Element Simulation of Bone Remodeling Model

2000 ◽  
Vol 122 (6) ◽  
pp. 677-680 ◽  
Author(s):  
M. Zidi ◽  
S. Ramtani
Keyword(s):  
Finite Element ◽  
Stability Analysis ◽  
Bone Remodeling ◽  
Stability Problem ◽  
Analytical Approach ◽  
Bone Structure ◽  
Stationary States ◽  
The Finite Element Method ◽  
Element Simulation ◽  
The Stability

Bone remodeling is widely viewed as a dynamic process—maintaining bone structure through a balance between the opposed activities of osteoblast and osteoclast cells—in which the stability problem is often pointed out. By an analytical approach, we present a bone remodeling model applied to n unit-elements in order to analyze the stationary states and the condition of their stability. In addition, this theory has been simulated in a computer model using the Finite Element Method (FEM) to show a relationship between the bone remodeling process and the stability analysis. [S0148-0731(00)01806-9]

Influence of tire blowout on the collision of a light pickup truck with a guardrail safety barrier

2019 ◽  
Vol 234 (6) ◽  
pp. 1714-1724
Author(s):  
Abdelmonaam Sassi ◽  
Sadok Sassi ◽  
Faris Tarlochan
Keyword(s):  
Finite Element ◽  
Pitch Angle ◽  
Dynamic Test ◽  
Element Model ◽  
Pickup Truck ◽  
Element Simulation ◽  
The Stability ◽  
Left Front ◽  
Yaw Angle ◽  
The Finite Element Model

This main purpose of this work is to investigate, through a finite-element simulation, the effect of tire blowout on the collision of a light pickup truck with a guardrail, at a speed of 100 km/h. The finite-element model was calibrated against a dynamic test carried out by the Texas Transportation Institute. Four cases of individual tire blowout were considered. Among these, the case of the left front tire was found to be the most critical one, resulting in a pitch angle of 24°, a roll angle of 12°, and a yaw angle of 30°. For this critical case, the results showed that the deflated tire trapped in the guardrail, which created more interaction between the vehicle and the guardrail beam. These challenging crash conditions were found to be more crucial for the stability of the pickup compared with the fully inflated tire scenario.

scholarly journals A Mechanical Modelling and Simulation Method for Resolving PIM Problems in Antennas

Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 294
Author(s):  
Chen Chen ◽  
Yangyang Gu
Keyword(s):  
Finite Element ◽  
Product Development ◽  
Structural Design ◽  
Nonlinear Distortion ◽  
Simulation Method ◽  
Design Phase ◽  
Root Cause ◽  
Element Simulation ◽  
Mechanical Modelling ◽  
The Stability

Passive intermodulation (PIM) generated from antennas is a nonlinear distortion phenomenon and causes serious problems to communication quality. Traditional radio frequency (RF) solutions focus on testing the final product to find the PIM source. However, it cannot solve the stability of PIM after the antenna is vibrated. This paper introduces a new method to improve the stability of PIM in the design phase. By studying the mechanism of PIM generation, a simulation method is proposed in this paper by applying mechanical finite element simulation and simulating the structural design of the device under test. Then, the stress at the PIM source is reduced, thereby the PIM stability of the product is improved. This paper adopts this method by studying a typical product, finding the root cause that affects the product PIM magnitude and stability, and optimizing its design. The PIM value of the new scheme is stable by making a prototype and testing. The method provided in this article can effectively improve product development efficiency and assist designers in avoiding the risks of PIM before the product’s manufacturing.

Finite Element Simulation and Stability Analysis of Composite Soil Nailing

2014 ◽  
Vol 580-583 ◽  
pp. 83-88 ◽  
Author(s):  
Jie Zhao ◽  
Ling Li Wang
Keyword(s):  
Finite Element ◽  
Stability Analysis ◽  
Soil Nailing ◽  
Deep Excavation ◽  
Soil Nail ◽  
Element Simulation ◽  
Normal Soil ◽  
Composite Soil Nailing ◽  
The Difference ◽  
The Stability

Under the condition of plane strain, a 2D elastoplastic FEM is used to analyze the behavior of composite soil nailing bracing of deep excavation, then finite element method of stability analysis is applied to evaluate the stability of the soil-nail wall. The authors analyzed the difference between composite soil nailing and normal soil nailing. Through analyzing the effect of bracing parameters on the deformation behavior and stability of the excavation, some useful conclusions are obtained to provide certain references for the design and construction of composite soil nailing.

Simulation Research of Deuterium and Tritium Ions Motion in Accelerating Electric Field for Neutron Tube

2014 ◽  
Vol 538 ◽  
pp. 62-67
Author(s):  
Ji Peng Huang ◽  
Gang Liu ◽  
Shuang Qiao
Keyword(s):  
Finite Element ◽  
Electric Field ◽  
Finite Element Simulation ◽  
Simulation Technology ◽  
Simulation Research ◽  
Element Simulation ◽  
Neutron Tube ◽  
Simulation Results ◽  
The Stability ◽  
Tube Structure

The model of neutron tube accelerating system was established to research what the effect of neutron tube accelerating gap, voltage and size of accelerating electrode on trajectory of deuterium tritium ion with finite element simulation technology. Some useful conclusions obtained from the simulation results provide the basis for optimizing the neutron tube structure and parameter, which can make neutron yields of 50-mm-diameter tube in the order of 109 n/s and the stability is not more than 2%.

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