scholarly journals The Structure of the Strength of Riveted Joints Determined in the Lap Joint Tensile Shear Test

2015 ◽  
Vol 9 (1) ◽  
pp. 44-49 ◽  
Author(s):  
Jacek Mucha ◽  
Waldemar Witkowski
Keyword(s):  
Mechanical Properties ◽  
Shear Test ◽  
Load Capacity ◽  
Sheet Material ◽  
Maximum Load ◽  
Lap Joint ◽  
Tensile Shear ◽  
Strength Limit ◽  
Riveted Joints ◽  
Basic Parameters

Abstract The article presents the analysis of the structure of the load capacity of riveted joints. For the four joining systems the lap joint specimens were made and tested in the shearing test. The joints were prepared for the three combinations of the DC01 steel and EN AW- 5754 aluminium alloy sheets with the thickness of 2mm. On the basis of the obtained load-elongation diagram tensile shear test curves, the basic parameters defined in the ISO/DIS 12996 standard were determined. In the case of the conventional riveted joints the maximum load capacity of the joint is determined by the strength of the fastener. For the joints with aluminium-steel blind rivet , the load capacity of the joint was on the strength limit of the rivet tubular part and on the strength limit of the sheet material. The strength of the SSPR joint is determined by the mechanical properties of the material of the joined sheets. From all sheets and rivet specimens arrangements the highest load capacity of the joint was obtained for the DC01 sheet material joints, and the lowest load capacity of the joint was obtained for the EN AW-5754 sheet material joints.

Resistance Spot Welding in Non-Combustible Magnesium Alloy

2020 ◽  
Author(s):  
Xuanyi Shao ◽  
Yukio Miyashita ◽  
Duriyathep Panwised ◽  
Rattana Borrisutthekul
Keyword(s):  
Magnesium Alloy ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Shear Test ◽  
Dissimilar Materials ◽  
Maximum Load ◽  
Tensile Shear ◽  
Similar Material ◽  
Resistance Spot ◽  
Surface Polishing

Abstract Resistance spot welding (RSW) was applied to non-combustible magnesium alloy, AX41 (Mg-4%Al-1%Ca) to investigate its weldability. The similar material joint of AX41 and dissimilar materials joint between AX41 and aluminum alloy, AA6061 were welded. Tensile shear test was carried out to evaluate joining strength in the similar and dissimilar materials RSW joints. In case of similar material joints, the maximum load obtained with tensile shear test in AX41 similar material joint was higher than that obtained in AA6061 similar material joint. Moreover, higher maximum load was obtained in a similar material joint without surface polishing compared to joint welded with surface polishing in AX41. In case of the dissimilar materials joint, the maximum load obtained was almost comparable with AX41 similar material joint, however scatter in joint strength was large. Weldability of the dissimilar materials joint became poor by applying surface polishing.

scholarly journals Microstructure and Fracture Behavior of Refill Friction Stir Spot Welded Joints of AA2024 Using a Novel Refill Technique

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 286 ◽  
Author(s):  
Lipeng Deng ◽  
Shuhan Li ◽  
Liming Ke ◽  
Jinhe Liu ◽  
Jidong Kang
Keyword(s):  
Spot Welding ◽  
Fracture Behavior ◽  
Shear Fracture ◽  
Load Capacity ◽  
Maximum Load ◽  
Fusion Welding ◽  
Tensile Shear ◽  
Friction Stir ◽  
Corona Ring ◽  
Spot Welded

Keyhole at the end of a conventional friction stir welded (FSW) joint is one of the major concerns in certain applications. To address this issue, a novel keyhole refilling technique was developed for conventional friction stir spot welding (FSSW) using resistance spot welding (RSW). A three-phase secondary rectifier resistance welder was adapted for the refill of the keyhole in the 1.5 mm + 1.5 mm friction stir spot welded 2024-T4 aluminum alloy joint. The microstructure and tensile shear fracture behavior were compared for both the unfilled and refilled specimens. The results show that the plug and keyhole are dominated by solid state welding with some localized zones by fusion welding. The refill process significantly improved the maximum load capacity in tensile shear testing as the corona ring is enlarged leading to a larger bonding area. Moreover, the tensile shear fracture occurs in the refilled FSSW specimens at the corona bonding zone, while the fracture occurs at the hook zone in the unfilled keyhole.

scholarly journals Study on the Static Performance of Prefabricated UHPC-Steel Epoxy Bonding Interface

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Yang Zou ◽  
Jinlong Jiang ◽  
Zhixiang Zhou ◽  
Xifeng Wang ◽  
Jincen Guo
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Shear Strength ◽  
Shear Test ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Bonding Interface ◽  
Tensile Shear ◽  
Epoxy Bonding ◽  
Shear Coupling

Prefabricated UHPC-steel composite structure can make full use of the two materials’ mechanical and construction performance characteristics, with super mechanical properties and durability, which has been proved to be a very promising structure. However, using traditional mechanical connectors to connect prefabricated UHPC and steel not only is inconvenient for the prefabrication of UHPC components but also introduces heavy welding work, which is detrimental to the construction speed and antifatigue performance of the composite structure. Bonding UHPC-steel interface with epoxy adhesive is a potential alternative to avoid the above problem. In order to explore the mechanical properties of the prefabricated UHPC-steel epoxy bonding interface, this study carried out the direct shear test, tensile test, and tensile-shear test of the UHPC-steel epoxy-bonded interface (prefabricated UHPC-steel epoxy bonding interface). The results show that the interface failure is mainly manifested as the peeling of the epoxy-UHPC interface and the destruction of part of the UHPC matrix (the failure of the UHPC's surface). In pure shear and pure tension state, the interfacial shear strength is 5.14 MPa and the interfacial tensile strength is 1.18 MPa. In the tensile-shear state, the interfacial shear strength is 0.61 MPa and the interfacial tensile strength is 1.06 MPa. The stress-displacement curves of the interface normal and tangential direction are all in the shape of a two-fold line. The ultimate displacement was within 0.1 mm, showing the characteristics of brittle failure. Finally, a numerical model of the tensile specimen is established based on the cohesive interface element, and the interfacial tensile-shear coupling failure mechanism (tensile-shear coupling effect) is analyzed.

scholarly journals The strength of traditional and self-pierced riveted joints

2018 ◽  
Vol 244 ◽  
pp. 01007
Author(s):  
Anna Rudawska ◽  
Izabela Miturska ◽  
Dana Stančeková ◽  
Jacek Mucha
Keyword(s):  
Shear Strength ◽  
Aluminum Alloy ◽  
Steel Sheet ◽  
Load Capacity ◽  
Sheet Material ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Riveted Joints ◽  
Different Types

The objective of this study is to compare the strength of riveted joints fabricated by traditional riveting (with pre-drilled holes) and self-piercing riveting (SPR) for different types of joints. Riveted joints were produced using steel and aluminum alloy rivets and two types of sheet material: 235JR steel sheet and EN AW 6060 aluminum alloy sheet with the following dimensions: length l = 100 ± 1 mm, width b = 50 ± 1 mm and thickness g = 2 mm. For all tested types of riveted joints (pre-drilled and SPR), 5 sets of joints were fabricated, each set containing 6 samples. The sets of joints differed with respect to the number of rivets (1, 2, 3, 4 and 6 rivets), joint type (single-, three- and four-riveted joints) and lap length. For all tested joints, the highest load capacity was obtained for self-pierced riveted joints, while the lowest - for pre-drilled joints with aluminum alloy rivets. In addition, it was found that the shear strength of self-pierced riveted joints is higher than that of aluminum and steel blind rivets.

Evaluation of Tensile Shear Strength for Lap Joint of Dissimilar Steels

2021 ◽  
Vol 1016 ◽  
pp. 1454-1459
Author(s):  
Yasuhito Takashima ◽  
Tomo Washio ◽  
Fumiyoshi Minami
Keyword(s):  
Shear Strength ◽  
Shear Test ◽  
Rotation Angle ◽  
Lap Joints ◽  
Weld Bead ◽  
Tensile Shear Strength ◽  
Lap Joint ◽  
Tensile Shear ◽  
Dissimilar Steels ◽  
Grade Steel

The influence of different thickness combinations was investigated on the strength of the lap joint of dissimilar steels. In this study, lap joints of dissimilar steels were welded by laser welding. The tensile shear test was conducted for the lap joints. Rotational deformation process around the weld bead of the lap joint was observed by a digital video camera during the test. Motion analysis from the video of the tensile shear test indicated that the rotation angle around the weld bead was reduced by overlapping higher strength grade steel. Three-dimensional elastic-plastic finite element analysis was performed for the tensile shear test of the lap joint. The numerically calculated deformation behavior of the lap joint subjected to tensile shear loading showed reasonable agreement with the experimental record. It was found that the rotation angle was reduced and tensile shear strength of the lap joint increase by overlapping higher strength grade steel sheet.

scholarly journals Characterization of a Bioresorbable Magnesium-Reinforced PLA-Integrated GTR/GBR Membrane as Dental Applications

Scanning ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Xin Du ◽  
Yahui Song ◽  
Xinxin Xuan ◽  
Shuzhen Chen ◽  
Xia Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Proliferation ◽  
Weight Loss ◽  
Corrosion Resistance ◽  
Degradation Rate ◽  
Electrochemical Impedance ◽  
Load Capacity ◽  
Maximum Load ◽  
Control Group ◽  
Osteoblast Cells

Inferior mechanical properties have always been a limitation of the bioresorbable membranes in GBR/GTR. This study is aimed at fabricating a bioresorbable magnesium-reinforced polylactic acid- (PLA-) integrated membrane and investigating its mechanical properties, degradation rate, and biocompatibility. The uncoated and fluoride-coated magnesium alloys, AZ91, were made into strips. Then, magnesium-reinforced PLA-integrated membrane was made through integration. PLA strips were used in the control group instead of magnesium strips. Specimens were cut into rectangular shape and immersed in Hank’s Balanced Salt Solution (HBSS) at 37°C for 4, 8, and 12 d. The weight loss of the AZ91 strips was measured. Three-point bending tests were conducted before and after the immersion to determine the maximum load on specimens. Potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) were conducted on coated and uncoated AZ91 plates to examine corrosion resistance. Murine fibroblast and osteoblast cells were cultured on circular specimens and titanium disks for 1, 3, and 5 d. Thereafter, WST test was performed to examine cell proliferation. As a result, the coated and uncoated groups showed higher maximum loads than the control group at all time points. The weight loss of AZ91 strips used in the coated group was lower than that in the uncoated group. PDP, EIS, SEM, and EDS showed that the coated AZ91 had a better corrosion resistance than the uncoated AZ91. The cell proliferation test showed that the addition of AZ91 did not have an adverse effect on osteoblast cells. Conclusively, the magnesium-reinforced PLA-integrated membrane has excellent load capacity, corrosion resistance, cell affinity, and proper degradation rate. Moreover, it has great potential as a bioresorbable membrane in the GBR/GTR application.

Study on Clinching for Similar and Dissimilar Titanium Alloy

2015 ◽  
Vol 1088 ◽  
pp. 144-147
Author(s):  
Yan Fang Ding ◽  
Xiao Chong He ◽  
Lun Zhao
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Experimental Method ◽  
Shear Test ◽  
Shear Fracture ◽  
Tensile Shear ◽  
Average Displacement ◽  
Average Load

Adopting experimental method to examine clinching is able to apply to the joining of similar and dissimilar titanium alloy in this study. Also, to use tensile-shear test to figure out mechanical properties of clinched joints to TA1-TA1 clinched joints and Al5052-TA1 clinched joints. The results show that average load of TA1-Al5052 clinched joints is largely lower than the average load of TA1-TA1 clinched joints. Average load of TA1-TA1 is around 4427.58, equal to 3.85 times to Al5052-TA1.The two types of fractured joints are all neck shear fracture of the upper sheets. Therefore, the strength of joints is dependant to the material of the upper sheet. The formability of TA1-TA1 clinched joints are superior to Al5052-TA1, and average displacement of TA1-TA1 clinched joints is about 1.23 times to Al5052-TA1 clinched joints.

Study on Mechanical Properties of Self-Piercing Riveted Joints about Titanium Alloy

2015 ◽  
Vol 723 ◽  
pp. 856-859 ◽  
Author(s):  
Yi Lu ◽  
Xiao Cong He ◽  
Yi Feng Wang
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Failure Mode ◽  
Mechanical Test ◽  
Sheet Material ◽  
Light Sheet ◽  
Variation Method ◽  
Lap Joint ◽  
Single Lap Joint ◽  
Static Mechanical

Adopting self-piercing riveting (SPR) joining, a new light sheet material joining method, to examine the joining of copper-titanium alloy (H62-TA1) sheet and titanium-aluminum alloy (TA1-Al5052) sheet. Also, using quasi-static mechanical test to figure out mechanical properties of H62-TA1 SPR single-lap joint and TA1-Al5052 SPR single-lap joint. In this study, using Dixon guidelines to eliminate abnormal value and adopting coefficient of variation method to validate reliability of test datum. The results show that failure mode of H62-TA1 joints is that the rivets are pulled out, failure mode of TA1-Al5052 joints is that the bottom sheet fracture. And tensile displacement and energy absorption of H62-TA1 joints are higher than that of TA1-Al5052 joints.

On the Use of Composite-Steel Joint for Semi-Monocoque Frame Design

2014 ◽  
Vol 619 ◽  
pp. 23-27
Author(s):  
Thanyarat Singhanart ◽  
Kulanun Chutisemachai ◽  
Kiatnathee Dilokthonsakun ◽  
Jintasarn Sanchai ◽  
Kasemphan Siriployngam
Keyword(s):  
Load Capacity ◽  
Maximum Load ◽  
Torsional Stiffness ◽  
Lap Joint ◽  
Element Analysis ◽  
Frame Design ◽  
Steel Joint ◽  
Fabric Composite ◽  
Fiber Fabric ◽  
Composite Steel

The design of semi-monocoque frame by using the composite-steel joint is considered in this paper. The frame is designed with weight less than 30kg and torsional stiffness more than 1200 Nm/deg. In order to design the semi-monocoque frame, the analysis of the composite-steel joint has to be clearly investigated. Therefore, the stress analysis of composite-steel joint is performed and then the frame is designed. The double lab joint with two holes is tested and verified by the experiments. The carbon-fiber fabric laminated with the KEVLAR fabric composite laminate is used for composite part. From experiments, the joint’s strength can be increased by using the eccentric holes. Therefore, in order to meet the requirement of the SAE rules; load capacity more than 30 kN, the eccentric hole double lap joint is numerically designed and applied to semi-monocoque frame. The joint has strength of 32 kN and can be used in frame design. The semi-monocoque frame is designed and analyzed by finite element analysis. The maximum stress at maximum load is 208 MPa which is less than the yield strength of the materials so it can withstand the loads, the mass is 29.6kg, and the torsional stiffness of the frame is 1408 Nm/degree. Therefore, the semi-monocoque frame can be successfully designed.

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