scholarly journals THE EXPERIMENT OF WRINKLING PERFORMANCE OF RECTANGULAR MEMBRANE UNDER UN-AXIAL TENSILE FORCE

2002 ◽  
Vol 67 (559) ◽  
pp. 143-150
Author(s):  
Pinqi LU ◽  
Kenichi KAWAGUCHI
Keyword(s):  
Tensile Force ◽  
Axial Tensile

Numerical investigations of the clinching process and the failure prediction of clinched joints for dissimilar sheets

2021 ◽  
pp. 095440622110250
Author(s):  
Qihan Li ◽  
Chuanwei Xu ◽  
Song Gao ◽  
Fenglei Ma ◽  
Qingming Zhao ◽  
...  
Keyword(s):  
Prediction Model ◽  
Aluminium Alloy ◽  
Tensile Force ◽  
Dissimilar Materials ◽  
Element Model ◽  
Fracture Load ◽  
Tensile Failure ◽  
Good Prediction ◽  
Axial Tensile ◽  
Dimensional Finite Element

The clinching process is more and more used in automotive design and manufacturing. Traditional quality inspection of joints needs a lot of destructive tests, which is time-consuming and material-consuming. In this paper, the clinching process and joints failure of dissimilar materials, 6061 aluminium alloy and HC340/590DP dual-phase steel, are studied. A two-dimensional finite element model is established. Experiments were carried out to verify the numerical model. Through the axial tensile test, the quality of clinched joints for upper steel-lower aluminium alloy and upper aluminium alloy-lower steel were measured, respectively, and the strength and safety of the joints met the requirements of design indexes. The conventional prediction model of maximum tensile force and its modified model was researched. Combined with numerical simulation results, the fracture load, the separation load, and the failure mode of two clinched joints were predicted, respectively. Furthermore, the results are in good agreement with the experimental results. The results show that the modified prediction model of maximum tensile force has a good prediction result, and the error rate is less than 10%. The modified prediction model of maximum tensile force can effectively predict the tensile failure test results, which provides a basis for the quality evaluation and strength prediction optimization of dissimilar materials clinched joints.

Effect of the Ratio between Tension and Bending Vibration Loads on the Fatigue Behavior and Failure Mode of Titanium Alloy TA11

2014 ◽  
Vol 898 ◽  
pp. 27-32
Author(s):  
Nan Ma ◽  
Xin Ling Liu ◽  
Zhi Wang Qiu ◽  
Yu Huai He ◽  
Chun Hu Tao ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Failure Mode ◽  
Failure Modes ◽  
Fatigue Behavior ◽  
Tensile Force ◽  
Fatigue Properties ◽  
Bending Vibration ◽  
Transversal Vibration ◽  
Axial Tensile ◽  
Vibration Loads

This paper studied the effect of the ratio between the axial tensile force and the transversal vibration loads on the fatigue behavior and failure mode of the near alpha titanium alloy TA11, to simulate the service stress state applied on the engine blades, where a large centrifugal force is superimposed with bending vibration loads. The plate-like specimens were used in the fatigue tests by a special testing device which was designed and fabricated in the present research,where the vibration loads were applied by the electro-magnetic exciters. By experiments under various multi-axial fatigue loading cases with different ratios between the axial tensile force and the transversal vibration loads, the fatigue behavior and failure modes were observed and compared. Then, the energy based fatigue criteria were applied for correlation of the test results. The fatigue properties of titanium alloy TA11 under the specialized loading conditions are characterized and discussed. In addition, the experimental observations on the vibration behavior superimposed with different magnitude of axial tensile force are also helpful for understanding the real working conditions of the engine blades.

scholarly journals Effect of Preseating on the Extrusion of Excess Cement at the Crown- Abutment Margin and the Associated Tensile Force for Cement-Retained Implant Restorations. A Pilot Study

2015 ◽  
Vol 17 (2) ◽  
pp. 33
Author(s):  
Rodrigo Jiménez Corrales DDS ◽  
Tatiana Vargas Koudriavtsev DDS. MS
Keyword(s):  
Tensile Strength ◽  
Pilot Study ◽  
Tensile Force ◽  
Axial Tensile ◽  
Implant Abutments

The purpose of this study was to compare the effect of preseating prior to cementation on the amount of cement excess at the crown-abutment margin and to analyze the associated tensile force after cementation. Preseating of the crown on an abutment analog was evaluated. Ten implant copings were cemented with temporary cement on ten straight implant abutments. The amount of cement excess at the crown margins was measured by weight. Axial tensile force was measured 24 hours after the cementation. Results were statistically analyzed using ANOVA (p= 0.05). Preseating of the crown had a significant effect on the amount of cement excess at the crown margin (p<0.05), without lowering the tensile strength values significantly. When cementing crowns on implant abutments with temporary cement a preseating protocol might be advisable in order to reduce the amount of cement excess at the crown margin.

scholarly journals Determination of Cable Tension Force using Accelerometer

2019 ◽  
Vol 9 (2) ◽  
pp. 224-229
Keyword(s):  
Natural Frequency ◽  
Tensile Force ◽  
Tensile Load ◽  
Free Vibrations ◽  
Tension Force ◽  
Main Element ◽  
Accelerometer Sensor ◽  
Simple Method ◽  
Long Span ◽  
Axial Tensile

Cable is the main element in a long span structure and is often used for special structures such as long span bridges, roofs and other structures that require a long span. The stiffness of the cable is determined by the amount of axial tensile force acting on the cable, and hence, the magnitude of the actual tensile force on the cable is an important factor to be determined and monitored. One simple method for determining the actual tensile force on a cable is to calculate the tensile force from the first natural frequency of the cable. However, it is important to ensure that the formulas used to calculate the tensile force are accurate. This research aims to determine the level of accuracy and the factors that influence the accuracy of the formula to determine the tension force of the cable from the natural frequency value of the cable. The methodology used in this research project was by applying free vibrations to the cable with given axial tensile load and measuring the acceleration that occurred with an accelerometer sensor. By using Fast Fourier Transform (FFT), the natural frequency value of the cable can be calculated and the actual tensile strength in the cable can be determined. From the experiment conducted, it was found that the length of the cable affects the accuracy of the measurement of the natural frequency and the magnitude of tensile force of the cable. The strain that occurs on the cable plays a very important role to the accuracy of the formulas used.

Wave Propagation Analysis of Piezoelectric Nanoplates Based on the Nonlocal Theory

2018 ◽  
Vol 18 (04) ◽  
pp. 1850060 ◽  
Author(s):  
Li-Hong Ma ◽  
Liao-Liang Ke ◽  
Yi-Ze Wang ◽  
Yue-Sheng Wang
Keyword(s):  
Wave Propagation ◽  
Electric Potential ◽  
Mechanical Load ◽  
Tensile Force ◽  
Nonlocal Parameter ◽  
Nonlocal Theory ◽  
Wave Number ◽  
Small Scale ◽  
Axial Tensile ◽  
Propagation Analysis

Based on the nonlocal theory, this paper develops the Kirchhoff nanoplate and Mindlin nanoplate models for the wave propagation analysis of piezoelectric nanoplates. The effects of small scale parameter and thermo-electro-mechanical loads are incorporated in the nanoplate models. The Hamilton’s principle is employed to derive the governing equations of the nanoplate, which are solved analytically to obtain the dispersion relation for piezoelectric nanoplates. The results show that the nonlocal parameter, temperature change, mechanical load and external electric potential have significant influence on the wave propagation characteristics of the piezoelectric nanoplates. The cut-off wave number is observed to exist for piezoelectric nanoplates subjected to positive electric potential, axial tensile force and temperature rise.

Effect of Make-Up on the Structural Performance of Standard Buttress Connections Subjected to Tensile Loading

2013 ◽  
Author(s):  
Timothy Galle ◽  
Wim De Waele ◽  
Patrick De Baets
Keyword(s):  
Load Distribution ◽  
Numerical Study ◽  
Tensile Force ◽  
Tensile Loading ◽  
Oil Wells ◽  
Coupling Length ◽  
Structural Performance ◽  
Axial Tensile ◽  
Frictional Forces ◽  
Initial Clearance

When establishing oil wells, pipe sections are connected by means of threaded couplings. In an effort to minimize the possibility of failure by jumpout, standard buttress connections were introduced. Part of their strength is directly acquired as a result of radial interference during make-up. This paper discusses the results of a numerical study evaluating the effect of make-up on the performance of a standard 4.5 inch API buttress connection when axial tensile force is applied. In order to characterize the structural performance, the load distribution along the coupling length is evaluated, combined with a parameter defining thread separation. The latter is indicative for jumpout and the tendency of creating a leak path throughout the thread helix. From the results it is clear that relative axial displacement within the coupling occurs, even when made up, because of an initial clearance among the load and stab flanks. This clearance may cause a connection to leak through the thread helix when available thread compound cannot heal this leak path. Despite undesirable effects on the sealability and rigidness of this joint, such a clearance is required to decrease frictional forces during make-up while maintaining the desired radial interference.

scholarly journals Impact of the Weld Geometry on the Stress Intensity Factor of the Welded T-Joint Exposed to the Tensile Force and the Bending Moment

2015 ◽  
Vol 11 (2) ◽  
pp. 103-109
Author(s):  
Jelena M. Djoković ◽  
Ružica R. Nikolić ◽  
Ján Bujňák
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Fracture Mechanics ◽  
Intensity Factor ◽  
Tensile Force ◽  
Bending Moment ◽  
Linear Elastic ◽  
Weld Geometry ◽  
Axial Tensile ◽  
The Impact

Abstract In this paper it is analyzed the welded T-joint exposed to the axial tensile force and the bending moment, for determining the impact of the weld geometry on the fracture mechanics parameters. The stress intensity factor was calculated analytically, based on the concept of the linear elastic fracture mechanics (LEFM), by application of the Mathematica® programming routine. The presence of the weld was taken into account through the corresponding correction factors. The results show that increase of the size of the triangular welds leads to decrease of the stress intensity factor, while the SIF increases with increase of the welds’ width. The ratio of the two welded plates’ thicknesses shows that plate thicknesses do not exhibit significant influence on the stress intensity factor behavior.

Design and Analysis of Soft Pneumatic Sleeve for Arm Orthosis

2016 ◽  
Author(s):  
Gaurav Singh ◽  
Chenzhang Xiao ◽  
Girish Krishnan ◽  
Elizabeth Hsiao-Wecksler
Keyword(s):  
Body Weight ◽  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Tensile Force ◽  
String Model ◽  
Joint Injury ◽  
Pneumatic Actuators ◽  
Axial Tensile ◽  
Tunnel Syndrome ◽  
Extreme Extension

Patients that use crutches for ambulation experience forces as high as 50% of body weight and extreme extension angles at the wrist, which increases the risk of joint injury such as carpal tunnel syndrome. We have designed and fabricated a soft pneumatic sleeve to reduce the wrist loading by transferring part of the load to the forearm. The sleeve uses a Fiber Reinforced Elastomeric Enclosure (FREE). FREEs are soft pneumatic actuators that can generate force and moment upon inflation. We have used a contracting FREE, which is wrapped in a helical shape around the forearm as part of the sleeve. Upon actuation, it contracts in length and reduces in diameter, thereby generating a constricting force around the forearm. In this paper, we describe the modeling of the constricting force generated by the helical FREE. We can model the FREE as a string due to its negligible bending stiffness. The constriction force can be expressed in terms of the axial tensile force generated in the FREE upon actuation and the geometry of the helix. To obtain the axial force, we have used a model previously reported in literature that uses a constrained volume maximization formulation. We validate the string model by comparing with experimental results.

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