scholarly journals Experimental and Numerical Study of Bead Welding Behavior of HDPE Pipe Under Uniaxial Loading

2019 ◽  
Vol 23 (1) ◽  
pp. 183-191
Author(s):  
Azzeddine Belaziz ◽  
Mohamed Mazari
Keyword(s):  
Experimental Study ◽  
Mechanical Behavior ◽  
High Density Polyethylene ◽  
Numerical Study ◽  
Base Material ◽  
Welding Process ◽  
Experimental Tests ◽  
Experimental Results ◽  
Butt Welding ◽  
Hdpe Pipe

Abstract The present paper is devoted to the experimental study of the mechanical behavior of high-density polyethylene structure subjected to traction and welded by means of butt-welding process. We were based ourselves on experimental tests which have been carried out to characterize the material studied, introducing the ductility or fragility of the bead welded section, and understood the effect of crosshead speeds on the mechanical behavior of the weld bead. The experimental results of the welded specimens are compared with those corresponding to the base material. In this study, two crosshead speeds of 10 and 50 mm/min were applied to make the comparison.

scholarly journals A Study on Rotary Friction Welding of Titanium Alloy (Ti6Al4V)

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Ho Thi My Nu ◽  
Truyen The Le ◽  
Luu Phuong Minh ◽  
Nguyen Huu Loc
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloys ◽  
Friction Welding ◽  
Base Material ◽  
Welding Process ◽  
High Strength ◽  
Fusion Welding ◽  
Experimental Results ◽  
Thermomechanical Model ◽  
Rotary Friction Welding

The selection of high-strength titanium alloys has an important role in increasing the performance of aerospace structures. Fabricated structures have a specific role in reducing the cost of these structures. However, conventional fusion welding of high-strength titanium alloys is generally conducive to poor mechanical properties. Friction welding is a potential method for intensifying the mechanical properties of suitable geometry components. In this paper, the rotary friction welding (RFW) method is used to study the feasibility of producing similar metal joints of high-strength titanium alloys. To predict the upset and temperature and identify the safe and suitable range of parameters, a thermomechanical model was developed. The upset predicted by the finite element simulations was compared with the upset obtained by the experimental results. The numerical results are consistent with the experimental results. Particularly, high upset rates due to generated power density and forging pressure overload that occurred during the welding process were investigated. The performances of the welded joints are evaluated by conducting microstructure studies and Vickers hardness at the joints. The titanium rotary friction welds achieve a higher tensile strength than the base material.

Temperature Distribution of Aluminum Alloys under Friction Stir Welding

2011 ◽  
Vol 264-265 ◽  
pp. 217-222 ◽  
Author(s):  
Ben Yuan Lin ◽  
P. Yuan ◽  
Ju Jen Liu
Keyword(s):  
Numerical Simulation ◽  
Temperature Distribution ◽  
Cross Section ◽  
Base Material ◽  
Welding Process ◽  
Measuring System ◽  
Close Correspondence ◽  
Distribution Profile ◽  
Butt Welding ◽  
Friction Stir

The temperature distribution of 6061-T6 aluminum alloy plates under a friction stir butt-welding was investigated by using experiment and numerical simulation. A real-time temperature measuring system was used to measure the temperature change in the welding process. Vickers hardness profiles were made on the cross-section of the weld after welding. A commercial software of FlexPDE, a solver for partial different equations with finite element method, was used to simulate the experimental welding process of this study. Comparison the experimental and numerical results, the temperature cycles calculated by numerical are similar to those measured by experiment. The temperature distribution profile obtained from the numerical simulation is symmetrical to the weld center and has a close correspondence with the hardness configuration and the microstructure of the weld. The region with the temperature over 300 °C is the zone of softening within the boundaries of base material and HAZ. The regions of 350 °C with minimum hardness are located near the boundary of HAZ and TMAZ. The maxima temperature about 500 °C distributes around the upper part of the weld center. However, the region above 400 °C only matches with the upper half of the weld nugget.

scholarly journals Experimental Study and High-Efficiency Simulation of In-Plane Behavior of Composite Frame Slab

2021 ◽  
Author(s):  
Wen-Hao Pan ◽  
Mu-Xuan Tao ◽  
Chuan-Hao Zhao ◽  
Ran Ding ◽  
Li-Yan Xu
Keyword(s):  
Experimental Study ◽  
Failure Mode ◽  
High Efficiency ◽  
Numerical Study ◽  
Element Model ◽  
Experimental Results ◽  
Loading Test ◽  
Composite Frame ◽  
Out Of Plane ◽  
Load Displacement

Abstract Experimental and numerical studies were conducted to investigate the in-plane behavior of the steel–concrete composite frame slab under cyclic loads. In the experimental study, an in-plane loading test of a typical composite frame slab was designed by constraining its out-of-plane deformations. The test observations, the load–displacement relationship, and the shear and flexural deformation components were discussed to investigate the in-plane load resistant behavior and the failure mechanism of the slab. The experimental results demonstrated an evident shear cracking concentration behavior and a pinching hysteretic curve associated with a typical shear-tension failure mode of the composite frame slab. In the numerical study, a high-efficiency modeling scheme based on the multiple vertical line element model (MVLEM) and the fiber beam–column element was developed for the test specimen. Comparisons with the experimental results showed that the developed model predicted the overall load–displacement relationship, the relationships associated with the shear and flexural deformation components, and the failure mode with a reasonable level of accuracy.

Experimental Study on the Effects of Rotational Speed and Attack Angle on High Density Polyethylene (HDPE) Friction Stir Welded Butt Joints

2011 ◽  
Vol 189-193 ◽  
pp. 3583-3587 ◽  
Author(s):  
Sina Saeedy ◽  
M.K. Besharati Givi
Keyword(s):  
Rotational Speed ◽  
High Density Polyethylene ◽  
Base Material ◽  
Welding Process ◽  
High Density ◽  
Attack Angle ◽  
Material Strength ◽  
Weld Quality ◽  
Welding Condition ◽  
Friction Stir

Friction stir welding (FSW) is a novel solid-state welding process and has been employed in several industries such as aerospace and automotive. Several parameters such as rotational speed, welding speed, axial force and attack angle play critical roles in FSW process in order to analyze the weld quality. The aim of this study is to investigate the effects of different rotational speeds and attack angles on the weld quality of high density polyethylene (HDPE). In the optimum welding condition, 75% of the base material strength is achieved. SEM micrographs show the changes of the weld microstructure which result in the reduction of the strength and the percent of elongation.

scholarly journals Friction stir welding of new electronic packaging materials SiCp/Al composite with T-joint

2018 ◽  
Vol 38 (3) ◽  
pp. 352-359
Author(s):  
Zeng Gao ◽  
Jianguang Feng ◽  
Huanyu Yang ◽  
Jukka Pakkanen ◽  
Jitai Niu
Keyword(s):  
Friction Stir Welding ◽  
Base Material ◽  
Welding Process ◽  
Experimental Results ◽  
Homogeneous Distribution ◽  
Welding Parameters ◽  
Matrix Composites ◽  
Friction Stir ◽  
Lower Temperature ◽  
Gas Tightness

Using friction stir welding, the electronic container box and lid made from aluminium matrix composites with reinforcement of SiC particle (15 vol% SiCp/Al-MMCs) was welded successfully with T-joint. The temperature distribution of box during the process, mechanical property and microstructure of the joint as well as gas tightness of welded box was investigated. The experimental results indicated that the satisfactory T-joint can be obtained under appropriate friction stir welding parameters. During the welding process, the bottom center, which was used to place the electronic component, reached a quite lower temperature of 100°C. That can ensure safety of components in the box. After the welding process, the microstructure in stir zone was better than in base material due to the refining and homogeneous distribution of the SiC particles. The experimental results showed that the electronic container box after friction stir welding had gas tightness. The He-leakage rate was under 10-8 Pa•m3/s.

scholarly journals Experimental Study Regarding the Influence of Welding Parameters on the Mechanical Behaviorof High Density Polyethylene Pipes

2021 ◽  
Vol 57 (4) ◽  
pp. 209-215
Author(s):  
Ibrahim Ramadan ◽  
Maria Tanase
Keyword(s):  
Experimental Study ◽  
High Density Polyethylene ◽  
Experimental Tests ◽  
High Density ◽  
Fusion Welding ◽  
Welding Parameters ◽  
Visual Examination ◽  
Polyethylene Pipes ◽  
Pressure Tests ◽  
Welding Procedure

The experimental study conducted for this article was made using the butt fusion welding procedure for high density polyethylene (HDPE) pipes. PE100 (SDR 17, PN 10) water pipes were used, as for the experimental study parts of around 200 to 300 mm were welded, using different welding parameters. The influence of the welding parameters on the pipes resistance was analyzed, through visual examination and experimental tests such as tensile, bending and pressure tests.

Thermo-Hydro-Mechanical Simulation of a Heating and Hydration Experimental Study (the China-Mock-Up) in GMZ Bentonite

2011 ◽  
Author(s):  
L. Chen ◽  
J. Wang ◽  
Y. M. Liu ◽  
F. Collin ◽  
J. L. Xie
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Qualitative Analysis ◽  
Mechanical Behavior ◽  
Liquid Water ◽  
Numerical Study ◽  
Experimental Investigations ◽  
Gmz Bentonite ◽  
Present Stage ◽  
Proposed Model

This paper presents a numerical study of the China-Mock-up test, with the purpose of evaluating the performance of Gaomiaozi (GMZ) bentonite under coupled thermo-hydro-mechanical (THM) conditions. In the paper, the basic THM characteristics of GMZ bentonite are presented first. The formulation of coupling heat, moisture (liquid water and water vapour) and air transfer is given. The model of Alonso-Gens (1) is incorporated to reproduce the mechanical behavior of the GMZ bentonite under unsaturated conditions. With the parameters determined from experimental investigations, numerical simulations of the China-Mock-up test are carried out using the code of LAGAMINE. Owing to the lack of experimental data at present stage, a qualitative analysis of the predictive results is realized. The results suggest that the proposed model is able to reproduce the mechanical behavior of GMZ bentonite, and to predict moisture and air motions under thermal solicitations.

scholarly journals Evaluation of residual stresses in a tube-to-plate welded joint

2019 ◽  
Vol 300 ◽  
pp. 19005 ◽  
Author(s):  
Andrea Chiocca ◽  
Francesco Frendo ◽  
Leonardo Bertini
Keyword(s):  
Residual Stresses ◽  
Numerical Simulations ◽  
Thermal Cycle ◽  
Transient Analysis ◽  
Welded Joint ◽  
Base Material ◽  
Welding Process ◽  
Deep Understanding ◽  
Experimental Tests ◽  
Temperature Dependent

A deep understanding of the manufacturing process is needed in order to achieve safety and quality requirements for parts and components; to this regard, residual stresses play an important role in welded structures. Residual stresses are mainly caused by the extremely severe thermal cycle to which the welded metal and base material are subjected to during welding process and their knowledge leads to a better static and fatigue assessment of welded joints. This work deals with the study of residual stresses for a tube to plate T-joint, made of S355JR carbon steel. The work was carried out by both numerical simulations and experimental tests. The numerical simulations were performed by Ansys FE code through a structural-thermal full transient analysis to evaluate stress, strain and temperature in each node at each step of the simulation. The “birth and death” method was employed, together with temperature-dependent material properties.A2Danda3D simulation were performed, in order to evaluate possible differences due to the welding process. Numerical results were compared to some preliminary measurements obtained through an incremental cut made on the plate.

Experimental Study on Bonding Mechanism between Corroded Bolts and Grout

2007 ◽  
Vol 345-346 ◽  
pp. 1063-1066
Author(s):  
Ning Xia ◽  
Mao Sen Cao ◽  
Qing Wen Ren
Keyword(s):  
Experimental Study ◽  
Stress Distribution ◽  
Mechanical Behavior ◽  
Corrosion Product ◽  
Pullout Test ◽  
Bond Stress ◽  
Experimental Results ◽  
Bonding Mechanism ◽  
The Relationship ◽  
Front Section

In this study, an experiment program is presented to study the bonding mechanism between corroded bolts and grout and in particular the influence on bonding behavior in terms of different corrosion sections along anchor. With respect to four groups of manufactured bolt specimens, the noncorroded and the corroded, respectively, on the front, middle and rear section along anchor, a pullout test is conducted to reveal the relationship between load and loading-end slip and to investigate the bond-stress distribution characterization along full anchor. Experimental results show that corrosion product, acting as lubricating effect at the interface between bolts and grout, can result in the degradation of bonding mechanical behavior. Meanwhile, corrosion on different sections along anchor has a different effect on the anchorage capacity of bolts. Especially, corrosion on the front section induces the greatest decrease of anchorage capacity of bolts. Thus, it is concluded that the front section along anchor is the key region affecting the bonding mechanical behavior between bolts and grout.

Experimental Study of Mechanical Behavior of HPL Composites

2015 ◽  
Vol 732 ◽  
pp. 139-142
Author(s):  
Milan Žaludek ◽  
Soňa Rusnáková ◽  
Ladislav Fojtl ◽  
Vladimír Rusnák
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Mechanical Behavior ◽  
Mechanical Behaviour ◽  
Experimental Results ◽  
Environment Effect ◽  
Service Load ◽  
Flexural Tests ◽  
Load Conditions

The paper provides experimental results from tensile and flexural tests of HPL composites. Mechanical properties of HPL laminates from four worldwide producers (Fundermax, Polyrey, Abet and Rexin) are compared. Composites are compared due to their stiffness and strength, both tensile and flexural. The exterior environment effect on mechanical behaviour of composites in service load conditions are presented too.

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