Damage Detection in Structures Using Electromechanical Impedance and Finite Element Analysis

2015 ◽  
Vol 799-800 ◽  
pp. 971-975
Author(s):  
Mohamed Djemana ◽  
Meftah Hrairi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Damage ◽  
Evaluation Method ◽  
Element Analysis ◽  
Electromechanical Impedance ◽  
Promising Tool ◽  
Modeled Structure ◽  
Safety And Reliability ◽  
Aluminum Beam

Impedance-based structural health monitoring (SHM) techniques have been developed as a promising tool for real-time structural damage assessment, and are considered as a new non-destructive evaluation method. It is gaining popularity due to its potential of reducing maintenance costs while increasing safety and reliability. This article present the results of Finite Element analysis performed for aluminum beam with bonded piezoelectric transducer (PZT). Modeled structure was excited to vibrate at high frequency range and electromechanical impedance (EMI) plots were obtained from the harmonic analysis. Notches were introduced in the beam and the damage metrics were used to asses qualitative changes in structural properties of the system. Furthermore, a parametric study of the effects of different variables was carried out. The numerical results show a good agreement was observed.

Crack Resistance Capacity Analysis of SRC Column-RC Beam Node

2012 ◽  
Vol 204-208 ◽  
pp. 2994-3001 ◽  
Author(s):  
Bo Yuan ◽  
Ming Hui Zeng ◽  
Ke Jian Ma
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Crack Resistance ◽  
Shear Strain ◽  
Complex Stress ◽  
Rc Beam ◽  
Element Analysis ◽  
High Rise ◽  
Safety And Reliability ◽  
Normal Work

It is very important for connection of between beam and column, connection safety and reliability is premise to guarantee the normal work of the whole structure. Node often bears complex stress which includes compression, bending and shear, so the study of the mechanical properties and ascertained behavior of mechanical, failure mechanism of between beam and column is very important. This paper use finite element analysis software to analyze the node of between SRC column and RC beam which exist in high-rise buildings but relatively few researches at present. Analyzed cracking load-displacement relation and studied on relation of concrete shear strain-section steel wing shear strain and crack load of joint core with different axial compression ratio, According to data of finite element analysis, this paper bring forward formula of crack resistance capacity of SRC column-RC beam joint core, At last compare theory value calculated with formula with test data, there being less error, it indicate the formula is reliable.

A Study on Predictable Model of Waterproofing for Mobile Phone Using Finite Element Analysis Based on Evaluation of Seal Rubber

2012 ◽  
Author(s):  
Hojin Jeon ◽  
Hyongwon Seo ◽  
Myunghan Kim ◽  
Jungyoul Kim
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Mobile Phone ◽  
Mobile Phones ◽  
Evaluation Method ◽  
Element Model ◽  
Element Analysis ◽  
Rubber Material ◽  
Behavior Characteristics

Recently, product manufacturers of mobile phone have to meet to high demands that allow their products endure variable bad environments exposed throughout the customers’ use. Especially, mobile phones need to resist to high humidity and general waterproofing that is prevalent in everyday usage. However, most previous studies related to seal material or methods for sealing assembly have been focused on heavy industry or automotive industry. In this paper, the aim is to predict waterproof possibility of mobile phone by using finite element analysis in design step. The criteria of waterproof condition for mobile phones was based on IEC60529 IPX-7 level[1]. This paper studied behavior characteristics and properties of the specialized rubber material for sealing the mobile phone housing. Constitutive equation for specialized seal rubber material was applied to the 3rd order Ogden function. Then, the correlation with test and finite element model was studied. Using the correlated finite element model for specialized seal rubber, evaluated behavior characteristics for seal rubber 2D shape and studied waterproof possibility analysis 3D model of mobile phone. The proposed suggestion is expected to predict waterproof possibility for mobile phone efficiently. Evaluation method of 2D finite element model will be useful for decision design specification of seal rubber shape at preceding design step. And evaluation method of 3D finite element model will predict waterproof possibility before tooling the mold and will save the costs at development step in industry.

Hammering Sound Frequency Analysis and Prevention of Intraoperative Periprosthetic Fractures during Total Hip Arthroplasty

2011 ◽  
Vol 21 (6) ◽  
pp. 718-723 ◽  
Author(s):  
Rina Sakai ◽  
Aki Kikuchi ◽  
Towa Morita ◽  
Naonobu Takahira ◽  
Katsufumi Uchiyama ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Frequency Analysis ◽  
Evaluation Method ◽  
Objective Evaluation ◽  
Sound Frequency ◽  
Periprosthetic Fractures ◽  
Cementless Stem ◽  
Element Analysis ◽  
The Relationship

Adequate fixation at the time of cementless stem implantation depends on the operator's experience. An objective evaluation method to determine whether the stem has been appropriately implanted may be helpful. We studied the relationship between the hammering sound frequency during stem implantation and internal stress in a femoral model, and evaluated the possible usefulness of hammering sound frequency analysis for preventing intraoperative fracture. Three types of cementless stem (BiCONTACT®, SL-PLUS®, and AI-Hip®) were used. Surgeons performed stem insertion using a procedure similar to that employed in a routine operation. Stress was estimated by finite element analysis, the hammering force was measured, and frequency analysis of hammering sound data obtained using a microphone. Finite element analysis showed a decrease in the hammering sound frequency with an increase in the estimated maximum stress. When a decrease in frequency was observed, adequate hammering had occurred, and the continuation of hammering risked fracture. Based on the relationship between stress and frequency, the evaluation of changes in frequency may be useful for preventing the development of intraoperative fractures. Using our method, when a decrease in frequency is observed, the hammering force should be reduced. Hammering sound frequency analysis may allow the prediction of bone fractures that can be visually confirmed, and may be a useful objective evaluation method for the prevention of intraoperative periprosthetic fractures during stem insertion.

Development of gripping comfort evaluation method based on finite element analysis

2019 ◽  
Vol 2019.31 (0) ◽  
pp. 1A14
Author(s):  
Kazuki HOKARI ◽  
Jonas A. PRAMUDITA ◽  
Masato ITO ◽  
Satoshi NODA ◽  
Yuji Tanabe
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Evaluation Method ◽  
Element Analysis ◽  
Comfort Evaluation

The Effect of Hole behind Lining on Safety of Tunnel

2013 ◽  
Vol 477-478 ◽  
pp. 600-603
Author(s):  
Jun Liu ◽  
Guan Hua Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Safety Factor ◽  
Evaluation Method ◽  
Working Condition ◽  
Two Dimensional ◽  
Analysis Software ◽  
Plane Model ◽  
Element Analysis ◽  
Dangerous Section

ABAQUS finite element analysis software and load - structure method are adapted in this paper and the structure is simplified as a two-dimensional plane model. 25 kinds of working condition including five hole sizes: 0.6m, 1.2m, 1.5m, 1.8m, 2.1m and five hole positions varying from vault to arch springing are studied and the safety factor distribution of lining are obtained. By comparing the safety factor at dangerous section in lining with hole to that in no damage lining , a convenient evaluation method about the effect of hole to lining safety is proposed.

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